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TJA1055TNXPN/a1627avaiEnhanced fault-tolerant CAN transceiver


TJA1055T ,Enhanced fault-tolerant CAN transceiverFeatures and benefits2.1 Optimized for in-car low-speed communication Pin-to-pin compatible with T ..
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TJA1055T
Enhanced fault-tolerant CAN transceiver
1. General description
The TJA1055 is the interface between the protocol controller and the physical bus wires in
a Controller Area Network (CAN). It is primarily intended for low-speed applications up to
125 kBd in passenger cars. The device provides differential receive and transmit
capability but will switch to single-wire transmitter and/or receiver in error conditions. The
TJA1055 is the enhanced version of the TJA1054 and TJA1054A. TJA1055 has the same
functionality but in addition offering a number of improvements. The most important
improvements of the TJA1055 with respect to the TJA1054 and TJA1054A are: Improved ElectroStatic Discharge (ESD) performance Lower current consumption in sleep mode Wake-up signalling on RXD and ERR without VCC active3 V interfacing with microcontroller possible with TJA1055T/3
2. Features and benefits
2.1 Optimized for in-car low-speed communication
Pin-to-pin compatible with TJA1054 and TJA1054A Baud rate up to 125 kBd Up to 32 nodes can be connected Supports unshielded bus wires Very low ElectroMagnetic Emission (EME) due to built-in slope control function and a
very good matching of the CANL and CANH bus outputs Very high ElectroMagnetic Immunity (EMI) in normal operating mode and in low power
modes Fully integrated receiver filters Transmit Data (TxD) dominant time-out function High ESD robustness: 8 kV Electrostatic Discharge (ESD) protection Human Body Model (HBM) for
off-board pins 6 kV Electrostatic Discharge (ESD) protection IEC 61000-4-2 for off-board pins Low-voltage microcontroller support
2.2 Bus failure management
Supports single-wire transmission modes with ground offset voltages up to 1.5V Automatic switching to single-wire mode in the event of bus failures, even when the
CANH bus wire is short-circuited to VCC
TJA1055
Enhanced fault-tolerant CAN transceiver
Rev. 5 — 6 December 2013 Product data sheet
NXP Semiconductors TJA1055
Enhanced fault-tolerant CAN transceiver
Automatic reset to differential mode if bus failure is removed Full wake-up capability during failure modes
2.3 Protections
Bus pins short-circuit safe to battery and to ground Thermally protected Bus lines protected against transients in an automotive environment An unpowered node does not disturb the bus lines Microcontroller interface without reverse current paths, if unpowered
2.4 Support for low power modes
Low current sleep mode and standby mode with wake-up via the bus lines Software accessible power-on reset flag
3. Quick reference data

[1] Junction temperature in accordance with “IEC 60747-1”. An alternative definition is: Tvj =Tamb+P Rth(vj-a)
where Rth(vj-a) is a fixed value to be used for the calculation of Tvj. The rating for Tvj limits the allowable
combinations of power dissipation (P) and operating ambient temperature (Tamb).
Table 1. Quick reference data

VCC supply voltage 4.75 - 5.25 V
VBAT battery supply voltage no time limit 0.3 - +40 V
operating mode 5.0 - 40 V
load dump - - 58 V
IBAT battery supply current sleep mode at VRTL =VWAKE =VINH=
VBAT =14V; Tamb=
40Cto +125C
-25 40 A
VCANH voltage on pin CANH VCC 0V; VBAT 0V; no time limit; with respect
to any other pin
58 - +58 V
VCANL voltage on pin CANL VCC 0V; VBAT 0V;
no time limit; with respect
to any other pin
58 - +58 V
VO(dom) dominant output voltage VTXD =0V; VEN =VCC
on pin CANH ICANH= 40 mA VCC 1.4- - V
on pin CANL ICANL =40 mA - - 1.4 V
tPD(L) propagation delay TXD
(LOW) to RXD (LOW)
no failures;
RCAN_L =RCAN_H=
125 ; CCAN_L = CCAN_H = 1 nF;
see Figure 4 to Figure6 1.5 s
Tvj virtual junction temperature [1] 40 - +150 C
NXP Semiconductors TJA1055
Enhanced fault-tolerant CAN transceiver
4. Ordering information

5. Block diagram

Table 2. Ordering information

TJA1055T SO14 plastic small outline package; 14 leads; body width 3.9 mm SOT108-1
TJA1055T/3
NXP Semiconductors TJA1055
Enhanced fault-tolerant CAN transceiver
6. Pinning information
6.1 Pinning

6.2 Pin description

Table 3. Pin description

INH 1 inhibit output for switching an external voltage regulator if a
wake-up signal occurs
TXD 2 transmit data input for activating the driver to the bus lines
RXD 3 receive data output for reading out the data from the bus lines
ERR 4 error, wake-up and power-on indication output; active LOW in
normal operating mode when a bus failure is detected; active LOW
in standby and sleep mode when a wake-up is detected; active
LOW in power-on standby when a VBAT power-on event is
detected
STB 5 standby digital control signal input; together with the input signal
on pin EN this input determines the state of the transceiver;
see Table 5 and Figure3 6 enable digital control signal input; together with the input signal on
pin STB this input determines the state of the transceiver;
see Table 5 and Figure3
WAKE 7 local wake-up signal input (active LOW); both falling and rising
edges are detected
RTH 8 termination resistor connection; in case of a CANH bus wire error
the line is terminated with a predefined impedance
RTL 9 termination resistor connection; in case of a CANL bus wire error
the line is terminated with a predefined impedance
VCC 10 supply voltage
CANH 11 HIGH-level CAN bus line
CANL 12 LOW-level CAN bus line
GND 13 ground
BAT 14 battery supply voltage
NXP Semiconductors TJA1055
Enhanced fault-tolerant CAN transceiver
7. Functional description

The TJA1055 is the interface between the CAN protocol controller and the physical wires
of the CAN bus (see Figure 7 and Figure 8). It is primarily intended for low-speed
applications, up to 125 kBd, in passenger cars. The device provides differential transmit
capability to the CAN bus and differential receive capability to the CAN controller.
To reduce EME, the rise and fall slopes are limited. This allows the use of an unshielded
twisted pair or a parallel pair of wires for the bus lines. Moreover, the device supports
transmission capability on either bus line if one of the wires is corrupted. The failure
detection logic automatically selects a suitable transmission mode.
In normal operating mode (no wiring failures) the differential receiver is output on pin RXD
(see Figure 1). The differential receiver inputs are connected to pins CANH and CANL
through integrated filters. The filtered input signals are also used for the single-wire
receivers. The receivers connected to pins CANH and CANL have threshold voltages that
ensure a maximum noise margin in single-wire mode.
A timer function (TxD dominant time-out function) has been integrated to prevent the bus
lines from being driven into a permanent dominant state (thus blocking the entire network
communication) due to a situation in which pin TXD is permanently forced to a LOW level,
caused by a hardware and/or software application failure.
If the duration of the LOW level on pin TXD exceeds a certain time, the transmitter will be
disabled. The timer will be reset by a HIGH level on pin TXD.
7.1 Failure detector

The failure detector is fully active in the normal operating mode. After the detection of a
single bus failure the detector switches to the appropriate mode (see Table 4). The
differential receiver threshold voltage is set at 3.2 V typical (VCC=5 V). This ensures
correct reception with a noise margin as high as possible in the normal operating mode
and in the event of failures1,2,5 and 6a. These failures, or recovery from them, do not
destroy ongoing transmissions. The output drivers remain active, the termination does not
change and the receiver remains in differential mode (see Table4).
Failures 3, 3a and 6 are detected by comparators connected to the CANH and CANL bus
lines. Failures3 and 3a are detected in a two-step approach. If the CANH bus line
exceeds a certain voltage level, the differential comparator signals a continuous dominant
condition. Because of inter operability reasons with the predecessor products TJA1054
and TJA1054A, after a first time-out the transceiver switches to single-wire operation
through CANH. If the CANH bus line is still exceeding the CANH detection voltage for a
second time-out, the TJA1055 switches to CANL operation; the CANH driver is switched
off and the RTH bias changes to the pull-down current source. The time-outs (delays) are
needed to avoid false triggering by external RF fields.
NXP Semiconductors TJA1055
Enhanced fault-tolerant CAN transceiver

[1] A weak termination implies a pull-down current source behavior of 75 A typical.
[2] A weak termination implies a pull-up current source behavior of 75 A typical.
Failure 6 is detected if the CANL bus line exceeds its comparator threshold for a certain
period of time. This delay is needed to avoid false triggering by external RF fields. After
detection of failure 6, the reception is switched to the single-wire mode through CANH; the
CANL driver is switched off and the RTL bias changes to the pull-up current source.
Recovery from failures3,3a and 6 is detected automatically after reading a consecutive
recessive level by corresponding comparators for a certain period of time.
Failures4 and 7 initially result in a permanent dominant level on pin RXD. After a time-out
the CANL driver is switched off and the RTL bias changes to the pull-up current source.
Reception continues by switching to the single-wire mode via pins CANH or CANL. When
failures4or 7 are removed, the recessive bus levels are restored. If the differential
voltage remains below the recessive threshold level for a certain period of time, reception
and transmission switch back to the differential mode.
If any of the wiring failure occurs, the output signal on pin ERR will be set to LOW. On
error recovery, the output signal on pin ERR will be set to HIGH again. In case of an
interrupted open bus wire, this failure will be detected and signalled only if there is an
open wire between the transmitting and receiving node(s). Thus, during open wire
failures, pin ERR typically toggles.
During all single-wire transmissions, EMC performance (both immunity and emission) is
worse than in the differential mode. The integrated receiver filters suppress any HF noise
induced into the bus wires. The cut-off frequency of these filters is a compromise between
propagation delay and HF suppression. In single-wire mode, LF noise cannot be
distinguished from the required signal.
Table 4. Bus failures
CANH wire
interrupted on on on differential CANL wire interrupted on on on on differential CANH short-circuited
to battery
weak[1] on off on CANL CANH short-circuited
to VCC
weak[1] on off on CANL CANL short-circuited
to ground weak[2] on off CANH CANH short-circuited
to ground on on on differential CANL short-circuited
to battery weak[2] on off CANH CANL short-circuited
to VCC on on on differential CANL and CANH
mutually
short-circuited weak[2] on off CANH
NXP Semiconductors TJA1055
Enhanced fault-tolerant CAN transceiver
7.2 Low power modes

The transceiver provides three low power modes which can be entered and exited via
STB and EN (see Table 5 and Figure3).
The sleep mode is the mode with the lowest power consumption. Pin INH is switched to
HIGH-impedance for deactivation of the external voltage regulator. Pin CANL is biased to
the battery voltage via pin RTL. Pins RXD and ERR will signal the wake-up interrupt even
in case VCC is not present.
The standby mode operates in the same way as the sleep mode but with a HIGH level on
pin INH.
The power-on standby mode is the same as the standby mode, however, in this mode the
battery power-on flag is shown on pin ERR instead of the wake-up interrupt signal. The
output on pin RXD will show the wake-up interrupt. This mode is only for reading out the
power-on flag.
[1] Wake-up interrupts are released when entering normal operating mode.
[2] For TJA1055T a diode is added in series with the high-side driver of ERR and RXD to prevent a reverse
current from ERR to VCC in the unpowered state.
[3] For TJA1055T/3, ERR and RXD are open-drain.
[4] In case the goto-sleep command was used before. When VCC drops, pin EN will become LOW, but due to
the fail-safe functionality this does not effect the internal functions.
[5] VBAT power-on flag will be reset when entering normal operating mode.
Wake-up requests are recognized by the transceiver through two possible channels: The bus lines for remote wake-up Pin WAKE for local wake-up
In order to wake-up the transceiver remotely through the bus lines, a filter mechanism is
integrated. This mechanism makes sure that noise and any present bus failure conditions
do not result into an erroneous wake-up. Because of this mechanism it is not sufficient to
simply pull the CANH or CANL bus lines to a dominant level for a certain time. To
guarantee a successful remote wake-up under all conditions, a message frame with a
dominant phase of at least the maximum specified tdom(CANH) or tdom(CANL) in it is required.
Table 5. Normal operating and low power modes

Goto-sleep
command
LOW HIGH wake-up
interrupt
signal[1]
[2][3] wake-up
interrupt
signal[1]
[2][3] VBAT
Sleep LOW LOW[4]
Standby LOW LOW
Power-on
standby
HIGH LOW VBAT
power-on
flag[5]
wake-up
interrupt
signal[1]
VBAT
Normal
operating
HIGH HIGH error flag no error
flag
dominant
received
data
recessive
received
data
VCC
NXP Semiconductors TJA1055
Enhanced fault-tolerant CAN transceiver

A local wake-up through pin WAKE is detected by a rising or falling edge with a
consecutive level exceeding the maximum specified tWAKE.
On a wake-up request the transceiver will set the output on pin INH to HIGH which can be
used to activate the external supply voltage regulator.
A wake-up request is signalled on ERR or RXD with an active LOW signal. So the external
microcontroller can activate the transceiver (switch to normal operating mode) via
pins STB and EN.
To prevent a false remote wake-up due to transients or RF fields, the wake-up voltage
levels have to be maintained for a certain period of time. In the low power modes the
failure detection circuit remains partly active to prevent an increased power consumption
in the event of failures3, 3a,4 and7.
To prevent a false local wake-up during an open wire at pin WAKE, this pin has a weak
pull-up current source towards VBAT. However, in order to protect the transceiver against
any EMC immunity issues, it is recommended to connect a not used pin WAKE to pin
BAT. Pin INH is set to floating only if the goto-sleep command is entered successfully. To
enter a successful goto-sleep command under all conditions, this command must be kept
stable for the maximum specified td(sleep).
Pin INH will be set to a HIGH level again by the following events only: VBAT power-on (cold start) Rising or falling edge on pin WAKE A message frame with a dominant phase of at least the maximum specified tdom(CANH)
or tdom(CANL), while pin EN or pin STB is at a LOW level Pin STB goes to a HIGH level with VCC active
To provide fail-safe functionality, the signals on pins STB and EN will internally be set to
LOW when VCC is below a certain threshold voltage (VCC(stb)). An unused output pin INH
can simply be left open within the application.
7.3 Power-on

After power-on (VBAT switched on) the signal on pin INH will become HIGH and an internal
power-on flag will be set. This flag can be read in the power-on standby mode through
pin ERR (STB= 1; EN= 0) and will be reset by entering the normal operating mode.
7.4 Protections

A current limiting circuit protects the transmitter output stages against short-circuit to
positive and negative battery voltage.
If the junction temperature exceeds the typical value of 175 C, the transmitter output
stages are disabled. Because the transmitter is responsible for the major part of the power
dissipation, this will result in a reduced power dissipation and hence a lower chip
temperature. All other parts of the device will continue to operate.
The pins CANH and CANL are protected against electrical transients which may occur in
an automotive environment.
NXP Semiconductors TJA1055
Enhanced fault-tolerant CAN transceiver

8. Limiting values

Table 6. Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134).[1]
VCC supply voltage 0.3 +6 V
VBAT battery supply voltage 0.3 +58 V
VTXD voltage on pin TXD 0.3 VCC +0.3 V
VRXD voltage on pin RXD 0.3 VCC +0.3 V
VERR voltage on pin ERR 0.3 VCC +0.3 V
VSTB voltage on pin STB 0.3 VCC +0.3 V
VEN voltage on pin EN 0.3 VCC +0.3 V
VCANH voltage on pin CANH VCC 0V; VBAT 0V;
no time limit; with
respect to any other pin
58 +58 V
VCANL voltage on pin CANL VCC 0V; VBAT 0V;
no time limit; with
respect to any other pin
58 +58 V
NXP Semiconductors TJA1055
Enhanced fault-tolerant CAN transceiver

[1] All voltages are defined with respect to pin GND, unless otherwise specified. Positive current flows into the
device.
[2] Test set-up according to IEC TS 62228, section 4.2.4. Verified by an external test house to ensure pins can
withstand ISO 7637 part 1 & 2 automotive transient test pulses 1, 2a, 3a and 3b.
[3] Only relevant if VWAKE [4] Junction temperature in accordance with “IEC 60747-1”. An alternative definition is: Tvj =Tamb+P Rth(vj-a)
where Rth(vj-a) is a fixed value to be used for the calculation of Tvj. The rating for Tvj limits the allowable
combinations of power dissipation (P) and operating ambient temperature (Tamb).
[5] Equivalent to discharging a 100 pF capacitor through a 1.5 k resistor.
[6] The ESD performance of pins CANH, CANL, RTH and RTL, with respect to GND, was verified by an
external test house in accordance with IEC-61000-4-2 (C = 150 pF, R = 330 ). The results were equal to,
or better than, 6kV.
[7] Equivalent to discharging a 200 pF capacitor through a 10  resistor and a 0.75 H coil.
Vtrt(n) transient voltage on
pins CANH and CANL
[2] 150 +100 V
VI(WAKE) input voltage on pin WAKE with respect to any
other pin 0.3 +58 V
II(WAKE) input current on pin WAKE [3] 15 - mA
VINH voltage on pin INH 0.3 VBAT +0.3 V
VRTH voltage on pin RTH with respect to any
other pin 58 +58 V
VRTL voltage on pin RTL with respect to any
other pin 58 +58 V
RRTH termination resistance on
pin RTH
500 16000 
RRTL termination resistance on
pin RTL
500 16000 
Tvj virtual junction temperature [4] 40 +150 C
Tstg storage temperature 55 +150 C
Vesd electrostatic discharge
voltage
human body model [5]
pins RTH, RTL,
CANH and CANL 8+8 kV
all other pins 2+2 kV
IEC 61000-4-2 [6]
pins RTH, RTL,
CANH and CANL 6+6 kV
machine model [7]
any pin 300 +300 V
Table 6. Limiting values …continued

In accordance with the Absolute Maximum Rating System (IEC 60134).[1]
NXP Semiconductors TJA1055
Enhanced fault-tolerant CAN transceiver
9. Thermal characteristics

10. Static characteristics

Table 7. Thermal characteristics

Rth(j-a) thermal resistance from junction
to ambient
in free air 120 K/W
Rth(j-s) thermal resistance from junction
to substrate
in free air 40 K/W
Table 8. Static characteristics

VCC= 4.75 V to 5.25 V; VBAT= 5.0 V to40 V; VSTB =VCC; Tvj= 40 C to +150 C; all voltages are defined with respect to
ground; positive currents flow into the device; unless otherwise specified.[1]
Supplies (pins VCC and BAT)

VCC supply voltage 4.75 - 5.25 V
VCC(stb) supply voltage for forced
standby mode (fail-safe)
3.1- 4.5V
ICC supply current normal operating mode;
VTXD =VCC (recessive)
2.5 6 10 mA
normal operating mode;
VTXD=0V (dominant); no load
313 21 mA
low power modes at VTXD =VCC
Tamb = 40 C to +85 C0 0 5 A
Tamb = +85 C to +125 C0 0 25 A
VBAT battery supply voltage no time limit 0.3 - +40 V
operating mode 5.0 - 40 V
load dump - - 58 V
IBAT battery supply current sleep mode at
VRTL =VWAKE =VINH =VBAT =14V;
Tamb = 40 Cto+125C
-25 40 A
low power mode at
VRTL =VWAKE =VINH =VBAT;
Tamb= 40 Cto+125C
VBAT =5V to8V 10 - 100 A
VBAT=8 V to40V 10 - 75 A
normal operating mode at
VRTL =VWAKE =VINH =VBAT =5V 40V 150 220 A
Vpof(BAT) power-on flag voltage on
pin BAT
low power modes
power-on flag set - - 3.8 V
power-on flag not set 5 - - V
Pins STB, EN and TXD

VIH HIGH-level input voltage 2.2 - VCC +0.3 V
VIL LOW-level input voltage 0.3 - +0.8 V
NXP Semiconductors TJA1055
Enhanced fault-tolerant CAN transceiver

IIH HIGH-level input current
pins STB and EN VI =4V - 11 21 A
pin TXD (TJA1055T) VI =3V 160 80 40 A
pin TXD (TJA1055T/3) normal operating mode; VI =2.4V 2 11 21 A
low power mode; VI =2.4V 0.1 0.9 2 A
IIL LOW-level input current
pins STB and EN VI =1V 2 11 - A
pin TXD (TJA1055T) VI =1V 400 240 100 A
pin TXD (TJA1055T/3) normal operating mode; VI =1V 2 11 - A
low power mode; VI =1V 0.1 0.9 2 A
Pins RXD and ERR (TJA1055T)

VOH(norm) HIGH-level output voltage
in normal mode
on pin ERR IO= 100 AVCC 0.9- VCC V
on pin RXD IO= 1mA VCC 0.9- VCC V
VOH(lp) HIGH-level output voltage
in low-power mode
on pin ERR IO= 100 AVCC 1.1 VCC 0.7 VCC 0.4 V
on pin RXD IO= 100 AVCC 1.1 VCC 0.7 VCC 0.4 V
VOL LOW-level output voltage IO =1.6 mA 0 - 0.4 V= 1.2 mA; VCC <4.75V 0 - 0.4 V =5mA 0 - 1.5 V
Pins RXD and ERR (TJA1055T/3)

IOL LOW-level output current VO = 0.4 V 1.3 3.5 - mA
ILH HIGH-level leakage
current =3 V 50 +8 A
Pin WAKE

IIL LOW-level input current VWAKE =0V; VBAT =40V 12 4 1 A
Vth(wake) wake-up threshold
voltage
VSTB =0V 2.5 3.2 3.9 V
Pin INH

VH HIGH-level voltage drop IINH= 0.18 mA; VBAT  5.5V - - 0.8 V
IINH= 0.18 mA; VBAT =5.0V - - 1.0 V
IL leakage current sleep mode; VINH =0V - - 5 A
Pins CANH and CANL

Vth(dif) differential receiver
threshold voltage
no failures and
bus failures1,2,5 and 6a;
see Figure4
VCC =5V 3.5 3.2 2.9 V
VCC= 4.75 V to 5.25V 0.70VCC 0.64VCC 0.58VCC V
Table 8. Static characteristics …continued

VCC= 4.75 V to 5.25 V; VBAT= 5.0 V to40 V; VSTB =VCC; Tvj= 40 C to +150 C; all voltages are defined with respect to
ground; positive currents flow into the device; unless otherwise specified.[1]
NXP Semiconductors TJA1055
Enhanced fault-tolerant CAN transceiver

VO(reces) recessive output voltage VTXD =VCC
on pin CANH RRTH <4k -- 0.2 V
on pin CANL RRTL <4k VCC 0.2- - V
VO(dom) dominant output voltage VTXD =0V; VEN =VCC
on pin CANH ICANH= 40 mA VCC 1.4- - V
on pin CANL ICANL =40mA - - 1.4 V
IO(CANH) output current on
pin CANH
normal operating mode;
VCANH =0V; VTXD =0V 110 80 45 mA
low power modes; VCANH =0V;
VCC =5V 0.25 - A
IO(CANL) output current on
pin CANL
normal operating mode;
VCANL =14V; VTXD =0V 70 100 mA
low power modes; VCANL =14V;
VBAT =14V - A
Vdet(sc)(CANH) detection voltage for
short-circuit to battery
voltage on pin CANH
normal operating mode; VCC =5V 1.5 1.7 1.85 V
low power modes 1.1 1.8 2.5 V
Vdet(sc)(CANL) detection voltage for
short-circuit to battery
voltage on pin CANL
normal operating mode
VCC =5V 6.6 7.2 7.8 V
VCC= 4.75 V to 5.25V 1.32VCC 1.44VCC 1.56VCC V
Vth(wake) wake-up threshold
voltage
on pin CANL low power modes 2.5 3.2 3.9 V
on pin CANH low power modes 1.1 1.8 2.5 V
Vth(wake) difference of wake-up
threshold voltages (on
pins CANL and CANH)
low power modes 0.8 1.4 - V
Vth(se)(CANH) single-ended receiver
threshold voltage on
pin CANH
normal operating mode and
failures4,6 and7
VCC =5V 1.5 1.7 1.85 V
VCC= 4.75 V to 5.25V 0.30VCC 0.34VCC 0.37VCC V
Vth(se)(CANL) single-ended receiver
threshold voltage on
pin CANL
normal operating mode and
failures3 and3a
VCC=5V 3.15 3.3 3.45 V
VCC= 4.75 V to 5.25V 0.63VCC 0.66VCC 0.69VCC V
Ri(se)(CANH) single-ended input
resistance on pin CANH
normal operating mode 110 165 270 k
Ri(se)(CANL) single-ended input
resistance on pin CANL
normal operating mode 110 165 270 k
Ri(dif) differential input
resistance
normal operating mode 220 330 540 k
Table 8. Static characteristics …continued

VCC= 4.75 V to 5.25 V; VBAT= 5.0 V to40 V; VSTB =VCC; Tvj= 40 C to +150 C; all voltages are defined with respect to
ground; positive currents flow into the device; unless otherwise specified.[1]
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