MAX3316ECAE+-MAX3317EEUP+-MAX3318EAP+-MAX3318ECUP+-MAX3318EEUP+-MAX3318EUP+-MAX3319ECAE+-MAX3319EEAE+ Fast Delivery |IC PHOENIX CO.,LIMITED

MAX3318EAP+ ,±15kV ESD-Protected, 2.5V, 1µA, 460kbps, RS-232-Compatible Transceiversfeatures a 1µA shutdown mode thatMAX3318EEUP -40°C to +85°C 20 TSSOPcan be entered by driving SHDN ..
MAX3318ECUP+ ,±15kV ESD-Protected, 2.5V, 1µA, 460kbps, RS-232-Compatible TransceiversELECTRICAL CHARACTERISTICS(V = +2.25V to +3.0V, C1–C4 = 0.1µF, T = T to T , unless otherwise noted. ..
MAX3318EEUP ,【15kV ESD-Protected, 2.5V, 1レA, 460kbps, RS-232 Compatible TransceiversMAX3316E–MAX3319E19-1616; Rev 0; 1/00±15kV ESD-Protected, 2.5V, 1µA, 460kbps,RS-232 Compatible Tran ..
MAX3318EEUP+ ,±15kV ESD-Protected, 2.5V, 1µA, 460kbps, RS-232-Compatible TransceiversMAX3316E–MAX3319E19-1616; Rev 1; 6/00±15kV ESD-Protected, 2.5V, 1µA, 460kbps,RS-232 Compatible Tran ..
MAX3318EIDB ,2.5-V 460-KBPS RS-232 Transceiver with IEC 61000-4-2 ESD-Protection 20-SSOP -40 to 85LOGIC DIAGRAM (POSITIVE LOGIC)13 17DIN1DOUT112 8DIN2DOUT22011FORCEOFFINVALIDAuto-Power-Down Plus114 ..
MAX3318EIDBR ,2.5-V 460-KBPS RS-232 Transceiver with IEC 61000-4-2 ESD-Protection 20-SSOP -40 to 85features a logic-level output (READY)Supplythat asserts when the charge pump is regulating andthe d ..
MAX6968AAE ,8-Port, 5.5V Constant-Current LED DriverFeaturesThe MAX6968 serial-interfaced LED driver provides♦ 25Mb Industry-Standard 4-Wire Serial Int ..
MAX6968AUE+ ,8-Port, 5.5V Constant-Current LED DriverFeaturesOUT2 7 10 OUT5Architectural LightingOUT3 8 9 OUT4TSSOP/PDIP/SSOP____ Maxim Integrated Produ ..
MAX6969AUG+ ,16-Port, 5.5V Constant-Current LED DriverFeaturesOUT4 9 16 OUT11Architectural LightingOUT5 10 15 OUT10OUT6 11 14 OUT9*Future product—contact ..
MAX6969AUG+ ,16-Port, 5.5V Constant-Current LED DriverFeaturesThe MAX6969 serial-interfaced LED driver provides 16♦ 25Mb, Industry-Standard, 4-Wire Seria ..
MAX6969AWG ,16-Port, 5.5V Constant-Current LED DriverApplicationsCLK 3 22 DOUTVariable Message SignsLE 4 21 OEMarquee DisplaysMAX6969AUGOUT0 5 20 OUT15M ..
MAX6969AWG+ ,16-Port, 5.5V Constant-Current LED Driverapplications requiring a watchdogtimer, refer to the MAX6979, which includes a fail-safeTypical App ..

MAX3316ECAE+-MAX3317EEUP+-MAX3318EAP+-MAX3318ECUP+-MAX3318EEUP+-MAX3318EUP+-MAX3319ECAE+-MAX3319EEAE+
±15kV ESD-Protected, 2.5V, 1µA, 460kbps, RS-232-Compatible Transceivers
________________General Description
The MAX3316E–MAX3319E are 2.5V powered RS-232
compatible transceivers. These devices feature shut-
down (MAX3317E), AutoShutdown Plus™ (MAX3318E/
MAX3319E), and enhanced electrostatic discharge
(ESD) protection integrated into the chip. All transmitter
outputs and receiver inputs are protected to ±15kV
using the IEC 1000-4-2 Air-Gap Discharge method,
±8kV using the IEC 1000-4-2 Contact Discharge
method, and ±15kV using the Human Body Model.
All devices are guaranteed at a data rate of 460kbps.
The transceivers have a proprietary low-dropout trans-
mitter output stage enabling RS-232 compatible opera-
tion from a +2.25V to +3.0V supply with a dual charge
pump. The charge pump requires only four 0.1µF
capacitors. The MAX3318E/MAX3319E feature a logic-
level output (READY) that asserts when the charge
pump is regulating and the device is ready to begin
transmitting.
The MAX3318E/MAX3319E achieve a 1µA supply current
using Maxim’s revolutionary AutoShutdown Plus feature.
These devices automatically enter a low-power shut-
down mode when the RS-232 cable is disconnected or
the transmitters of the connected peripherals are inactive
for more than 30 seconds. They turn on again when
they sense a valid transition at any transmitter or receiver
input. AutoShutdown Plus saves power without
changes to the existing BIOS or operating system. The
MAX3317E also features a 1µA shutdown mode that
can be entered by driving SHDNlow. The MAX3317E’s
receivers remain active while in shutdown mode, allowing
external devices such as modems to be monitored
using only 1µA supply current.
These devices are available in space-saving packages:
MAX3316E (16-pin SSOP and 20-pin TSSOP), MAX3317E/
MAX3318E (20-pin SSOP and 20-pin TSSOP), and
MAX3319E (16-pin SSOP).
________________________Applications
Palmtop Computers
Hand-Held Instruments
Pagers
Cellular Phones
GPS
Handy Terminals
Hand-Held Electronic Books
____________________________FeaturesESD Protection for RS-232 I/O Pins
±15kV—Human Body Model
±8kV—IEC 1000-4-2, Contact Discharge
±15kV—IEC 1000-4-2, Air-Gap Discharge300µA Operating Supply Current1µA Low-Power Shutdown with Receivers ActiveGuaranteed 460kbps Data RateGuaranteed 4V/µs Slew RateRS-232 Compatible Down to 2.25V
MAX3316E–MAX3319E
±15kV ESD-Protected, 2.5V, 1µA, 460kbps,
RS-232 Compatible Transceivers
FORCEOFF
VCC
GND
T1OUTC1-
C1+
READY
R1IN
R1OUT
FORCEON
T1INT2OUT
C2-
C2+
T2IN
INVALIDR2OUT
R2IN
MAX3318E
SSOP/TSSOP
Pin Configurations
19-1616; Rev 1; 6/00
Ordering Information
Selector Guide and Typical Application Circuits appear at
end of data sheet.
AutoShutdown Plus is a trademark of Maxim Integrated Products.
PART
MAX3316ECUP0°C to +70°C
TEMP. RANGEPIN-PACKAGE
20 TSSOP
MAX3316ECAE0°C to +70°C16 SSOP
MAX3316EEUP-40°C to +85°C20 TSSOP
MAX3316EEAE-40°C to +85°C16 SSOP
MAX3317ECUP0°C to +70°C20 TSSOP
MAX3317ECAP0°C to +70°C20 SSOP
MAX3317EEUP-40°C to +85°C20 TSSOP
MAX3317EEAP-40°C to +85°C20 SSOP
MAX3318ECUP0°C to +70°C20 TSSOP
MAX3318ECAP0°C to +70°C20 SSOP
MAX3318EEUP-40°C to +85°C20 TSSOP
MAX3318EEAP-40°C to +85°C20 SSOP
MAX3319ECAE0°C to +70°C16 SSOP
MAX3319EEAE-40°C to +85°C16 SSOP
Pin Configurations continued at end of data sheet.
±15kV ESD-Protected, 2.5V, 1µA, 460kbps,
RS-232 Compatible Transceivers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC= +2.25V to +3.0V, C1–C4 = 0.1µF, TA= TMINto TMAX, unless otherwise noted. Typical values are at VCC= +2.5V,= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VCCto GND..............................................................-0.3V to +6V
V+ to GND (Note 1)..................................................-0.3V to +7V
V- to GND (Note 1)...................................................-7V to +0.3V
V+ + |V-| (Note 1).................................................................+13V
Input Voltages
T_IN, EN, SHDN, FORCEON,
FORCEOFFto GND...............................................-0.3V to +6V
R_IN to GND..................................................................±25V
Output Voltages
T_OUT to GND............................................................±13.2V
R_OUT, INVALID, READY to GND.......-0.3V to (VCC+ 0.3V)
Short-Circuit Duration, T_OUT to GND.......................Continuous
Continuous Power Dissipation (TA= +70°C)
16-Pin SSOP (derate 7.14mW/°C above +70°C).......571mW
20-Pin SSOP (derate 8.00mW/°C above +70°C).......640mW
20-Pin TSSOP (derate 7.00mW/°C above +70°C).....559mW
Operating Temperature Range
MAX331_EC_ _.................................................0°C to +70°C
MAX331_EE_ _..............................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
Note 1:V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
SHDN= GND (MAX3317E); FORCEOFF=
GND (MAX3318E/MAX3319E)
All transmitter outputs loaded with 3kΩto
ground
FORCEON = GND, FORCEOFF= VCC,
all R_IN idle, all T_IN idle
(MAX3318E/MAX3319E)= +25°C= +25°C= +25°C= VCC(MAX3317E), receivers disabled
T_IN, EN, SHDN, FORCEON, FORCEOFF
SHDN= VCC, no load (MAX3317E);
FORCEON = FORCEOFF= VCC, no load
(MAX3318E/MAX3319E)
T_IN, EN, SHDN, FORCEON, FORCEOFF
IOUT= -0.5mA
T_IN, EN, SHDN, FORCEON, FORCEOFF
IOUT= 0.5mA
CONDITIONS±3.7±4Output Voltage Swing357Input Resistance0.3Input Hysteresis0.7 ·VCCInput Threshold High0.3 ·VCCInput Threshold Low-25+25Input Voltage Range0.9 ·VCCOutput Voltage High0.1 ·VCCOutput Voltage Low110Shutdown Supply Current110AutoShutdown Plus Supply
Current±0.05±10Output Leakage Current±0.01±1Input Leakage Current0.3Transmitter Input Hysteresis0.31Supply Current0.3 ·VCCInput Logic Threshold Low0.7 ·VCCInput Logic Threshold High
UNITSMINTYPMAXSYMBOL
LOGIC INPUTS
RECEIVER OUTPUTS
RECEIVER INPUTS
MAX3316E–MAX3319E
PARAMETER
DC CHARACTERISTICS (VCC= +2.5V, TA= +25°C)
TRANSMITTER OUTPUTS
MAX3316E–MAX3319E
±15kV ESD-Protected, 2.5V, 1µA, 460kbps,
RS-232 Compatible Transceivers
ELECTRICAL CHARACTERISTICS (continued)
(VCC= +2.25V to +3.0V, C1–C4 = 0.1µF, TA= TMINto TMAX, unless otherwise noted. Typical values are at VCC= +2.5V,= +25°C.)
TIMING CHARACTERISTICS
(VCC= +2.25V to +3.0V, C1–C4 = 0.1µF, TA= TMINto TMAX, unless otherwise noted. Typical values are at VCC= +2.5V,= +25°C.)
VCC= 0 or 2.25V to 3.0V, VOUT= ±12V,
transmitters disabled
VCC= 0, transmitter output = ±2V
CONDITIONS±25Output Leakage Current±25±60Output Short-Circuit Current30010MOutput Resistance
UNITSMINTYPMAXSYMBOLPARAMETER
VCC= 2.5V, Figure 4b
IOUT= -0.5mA
IOUT= 0.5mA
Figure 4a
Figure 4a1tINVHReceiver Positive or Negative
Threshold to INVALIDHigh0.9 ·VCCINVALID, READY Output
Voltage High0.1 ·VCCINVALID, READY Output
Voltage Low-0.30.3Receiver Input Threshold to
INVALIDOutput Low
-2.7V2.7Receiver Input Threshold to
INVALIDOutput High
Positive threshold
VCC= 2.5V, Figure 4b (Note 2)
VCC= 2.5V, Figure 4b (Note 2)
VCC= 2.5V, Figure 4b
Negative threshold153060tAUTO-
SHDN
Receiver or Transmitter Edge to
Transmitters Shutdown100tWUReceiver or Transmitter Edge to
Transmitters Enabled30tINVLReceiver Positive or Negative
Threshold to INVALIDLow
R_IN to R_OUT, CL= 150pF= 3kΩ, CL= 1000pF, one transmitter
switching
Normal operation (MAX3317E)
Normal operation (MAX3317E)
(Note 3)
CONDITIONS
0.175tPLHµs0.175tPHL
kbps460Maximum Data Rate
Receiver Propagation Delay250Receiver Output Enable Time250Receiver Output Disable Time100|tPHL- tPLH|Transmitter Skew50|tPHL- tPLH|Receiver Skew
UNITSMINTYPMAXSYMBOLPARAMETER
AutoShutdown Plus (FORCEON = GND, FORCEOFF= VCC)(MAX3318E/MAX3319E)
ESD PROTECTION
R_IN, T_OUT
±15±15
Human Body Model
IEC 1000-4-2 Air-Gap Discharge method
IEC 1000-4-2 Contact Discharge method
MAX3316E–MAX3319E
±15kV ESD-Protected, 2.5V, 1µA, 460kbps,
RS-232 Compatible Transceivers
Typical Operating Characteristics
(VCC= +2.5V, C1–C4 = 0.1µF, 460kbps data rate, all transmitters loaded with 3kΩ, TA= +25°C, unless otherwise noted.)
MAX3316E/MAX3317E
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX3316E TOC01
VCC (V)
SUPPLY CURRENT (mA)T1 TRANSMITTING AT SPECIFIED
DATA RATE
T2 TRANSMITTING AT 20kbps
CL = 1000pF
460kbps
230kbps
20kbps
MAX3316E/MAX3317E
TRANSMITTER OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
MAX3316E TOC02
VCC (V)
TRANSMITTER OUTPUT VOLTAGE (V)
T_OUT+
T_OUT-
T1 TRANSMITTING AT 460kbps
T2 TRANSMITTING AT 20kbps
CL = 1000pF100020003000
MAX3316E/MAX3317E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3316E TOC03
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
T_OUT+
T_OUT-
T1 TRANSMITTING AT 460kbps
T2 TRANSMITTING AT 20kbps
MAX3316E/MAX3317E
SLEW RATE vs. LOAD CAPACITANCE
MAX3316E TOC04
LOAD CAPACITANCE (pF)
SLEW RATE (V/200010003000
-SLEW
+SLEW
FOR DATA RATES UP TO 460kps
TIMING CHARACTERISTICS (continued)
(VCC= +2.25V to +3.0V, C1–C4 = 0.1µF, TA= TMINto TMAX, unless otherwise noted. Typical values are at VCC= +2.5V,= +25°C.)
Note 2:A transmitter/receiver edge is defined as a transition through the transmitter/receiver input logic thresholds.
Note 3:Transmitter skew is measured at the transmitter zero crosspoints.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
V/µs430
VCC= 2.5V, TA= +25°C, RL= 3kΩto 7kΩ,
measured from +3V to -3V or -3V to +3V,= 150pF to 2500pF
Transition-Region Slew Rate
MAX3316E–MAX3319E
±15kV ESD-Protected, 2.5V, 1µA, 460kbps,
RS-232 Compatible Transceivers
MAX3318E/MAX3319E
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX3316E TOC06
VCC (V)
SUPPLY CURRENT (mA)
460kbps
230kbps
20kbps
T1 TRANSMITTING AT SPECIFIED
DATA RATE
T2 TRANSMITTING AT 20kbps
CL = 1000pF
MAX3318E/MAX3319E
TRANSMITTER OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
MAX3316E TOC07
VCC (V)
TRANSMITTER OUTPUT VOLTAGE (V)
T1 TRANSMITTING AT 460kbps
T2 TRANSMITTING AT 20kbps
CL = 1000pF
T_OUT+
T_OUT-100020003000
MAX3318E/MAX3319E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3316E TOC08
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
T_OUT+
T_OUT-
T1 TRANSMITTING AT 460kbps
T2 TRANSMITTING AT 20kbps
MAX3318E/MAX3319E
SLEW RATE vs. LOAD CAPACITANCE
MAX3316E TOC09
LOAD CAPACITANCE (pF)
SLEW RATE (V/
-SLEW
+SLEW
FOR DATA RATES UP TO 460kbs0
MAX3318E/MAX3319E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3316E TOC10
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)100020003000
460kbps
230kbps
20kbps
T1 TRANSMITTING AT SPECIFIED
DATA RATE
T2 TRANSMITTING AT 20kbps
Typical Operating Characteristics (continued)
(VCC= +2.5V, C1–C4 = 0.1µF, 460kbps data rate, all transmitters loaded with 3kΩ, TA= +25°C, unless otherwise noted.)
MAX3316E/MAX3317E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3316E TOC05
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)100020003000
T1 TRANSMITTING AT SPECIFIED DATA RATE
T2 TRANSMITTING AT 20kbps
460kbps
230kbps
20kbps
MAX3316E–MAX3319E
±15kV ESD-Protected, 2.5V, 1µA, 460kbps,
RS-232 Compatible Transceivers
TRANSMITTER SKEW vs.
LOAD CAPACITANCE (tPLH - tPHL)
MAX3316E TOC11
LOAD CAPACITANCE (pF)
TRANSMITTER SKEW (ns)
MAX3316E/MAX3317E
MAX3318E/MAX3319E
T1 TRANSMITTING AT 460kbps
T2 TRANSMITTING AT 20kbps
MAX3318E/MAX3319E
READY TURN-ON TIME
vs. TEMPERATURE
MAX3316E TOC12
TEMPERATURE (°C)
READY TURN-ON TIME (
MAX3318E/MAX3319E
READY TURN-OFF TIME
vs. TEMPERATURE
MAX3316E TOC13
TEMPERATURE (°C)
READY TURN-OFF TIME (ns)
Typical Operating Characteristics (continued)
(VCC= +2.5V, C1–C4 = 0.1µF, 460kbps data rate, all transmitters loaded with 3kΩ, TA= +25°C, unless otherwise noted.)
Pin Description
MAX3318E
8, 17
12, 13
10, 15
9, 16
No Connection
Receiver Enable, Active Low
FUNCTION
Positive Terminal of Voltage-Doubler Charge-
Pump Capacitor
+2 · VCCGenerated by the Charge Pump
Negative Terminal of Voltage-Doubler Charge-
Pump Capacitor
RS-232 Transmitter Outputs
-2 · VCCGenerated by the Charge Pump
Negative Terminal of Inverting Charge-Pump
Capacitor
Positive Terminal of Inverting Charge-Pump
Capacitor
+2.25V to +3.0V Single-Supply Voltage
Ground
CMOS Transmitter Inputs
CMOS Receiver Outputs
RS-232 Receiver Inputs
MAX3319E
N.C.
NAME
C1+
C1-
T_OUT
C2-
C2+
VCC
GND
T_IN
R_OUT
R_IN1, 10, 11, 2011, 141
MAX3316EMAX3317E22
PIN3344
7, 148, 178, 1777665519191818
10, 1113, 1412, 13
9, 1212, 1510, 15
8, 139, 169, 16
SSOPTSSOP
MAX3316E–MAX3319E
±15kV ESD-Protected, 2.5V, 1µA, 460kbps,
RS-232 Compatible Transceivers
Pin Description (continued)
Detailed Description
Dual Charge-Pump Voltage Converter
The MAX3316E–MAX3319Es’ internal power supply
consists of a regulated dual charge pump that provides
output voltages of +4.4V (doubling charge pump) and
-4.3V (inverting charge pump), over the +2.25V to
+3.0V range. The charge pump operates in discontinu-
ous mode: if the output voltages are less than 4.4V, the
charge pump is enabled; if the output voltages exceed
4.4V, the charge pump is disabled. Each charge pump
requires a flying capacitor (C1, C2) and a reservoir
capacitor (C3, C4) to generate the V+ and V- supplies.
The READY output (MAX3318E/MAX3319E) is low
when the charge pumps are disabled in shutdown
mode. The READY signal asserts high when V- goes
below -2.75V.
RS-232 Compatible Transmitters
The MAX3316E–MAX3319Es’ transmitters are inverting
level translators that convert CMOS-logic levels to
RS-232 compatible voltage levels. They guarantee a
460kbps data rate with worst-case loads of 3kΩin parallel
with 1000pF, providing compatibility with PC-to-PC
communication software (such as LapLink™).
The MAX3317E’s transmitters are turned off (high
impedance) when SHDNis asserted low, putting the
device in shutdown mode. The MAX3318E/MAX3319Es’
transmitters are turned off (high impedance) when
FORCEOFFis asserted low, or when the AutoShutdown
Plus circuitry senses that all receiver and transmitter
inputs are inactive for more than 30 seconds.
The transmitter outputs can be driven to ±12V when
power is off. The transmitter inputs do not have internal
pull-up resistors. Connect unused inputs to GND or VCC.
RS-232 Receivers
The MAX3316E–MAX3319Es’ receivers convert ±3.7V
to ±13.2V RS-232 signal levels into CMOS-logic output
levels. The receivers are rated to receive signals up to
±25V. The MAX3316E/MAX3318E/MAX3319Es’
receivers feature inverting outputs that always remain
active (Table 1). The MAX3317E’s receivers have
inverting, three-state outputs. In shutdown, the
receivers can be active or inactive (Table 2).
The MAX3318E/MAX3319E feature an INVALIDoutput
that is asserted low when no valid RS-232 voltage levels
have been detected on all receiver inputs. Because
INVALIDindicates the receiver’s input condition, it
is independent of the states of FORCEON and
FORCEOFF.
MAX3317E Shutdown Mode
Supply current falls to less than 1µA in shutdown mode
(SHDN= low). When shut down, the device’s charge
pumps are turned off, V+ is pulled down to VCC, V- is
pulled to ground, and the transmitter outputs are dis-
abled (high impedance). The time required to exit shut-LapLink is a trademark of Traveling Software.
PIN
MAX3316EMAX3317EMAX3318EMAX3319E
NAMEFUNCTION
Shutdown Control, Active Low
Ready to Transmit Output, Active High. READY is
enabled high when V- goes below -3.5V and the
device is ready to transmit.
Valid Signal Detector Output, Active Low. A logic
high indicates that a valid RS-232 level is present
on a receiver input.
Force-On Input, Active High. Drive high to override
AutoShutdown Plus, keeping transmitters and
receivers on (FORCEOFFmust be high) (Table 1).
Force-Off Input, Active Low. Drive low to shut
down transmitters, receivers, and charge pump.
This overrides AutoShutdown Plus and FORCEON
(Table 1).
FORCEOFF
FORCEON
INVALID
READY
SHDN—2020
SSOPTSSOP
MAX3316E–MAX3319E
±15kV ESD-Protected, 2.5V, 1µA, 460kbps,
RS-232 Compatible Transceivers
down is typically 30µs, as shown in Figure 2. Connect
SHDNto VCCif the shutdown mode is not used; SHDN
has no effect on R_OUT.
MAX3318E/MAX3319E
AutoShutdown Plus Mode
Maxim’s AutoShutdown Plus feature on the MAX3318E/
MAX3319E allows the supply current to fall to 1µA.
These devices will enter the AutoShutdown Plus mode if
FORCEOFFis high, FORCEON is low, and they do not
sense a valid signal transition on any receiver or trans-
mitter input for 30 seconds. This may occur if the RS-232
cable is disconnected or if the peripheral transmitters
are turned off, and the UART driving the transmitter
inputs is inactive. The system turns on again when a
valid transition is applied to any RS-232 receiver or
transmitter input. As a result, the system saves power
without changes to the existing BIOS or operating system.
Figure 4a depicts valid and invalid RS-232 receiver volt-
age levels. INVALIDindicates the receiver input’s condi-
tion and is independent of FORCEON and FORCEOFF
states. Figure 3 and Table 1 summarize the operating
modes of the MAX3318E/MAX3319E. FORCEON and
FORCEOFFoverride AutoShutdown Plus circuitry. When
neither control is asserted, the IC selects between these
states automatically based on the last receiver or trans-
mitter edge received.
When shut down, the device’s charge pumps turn off,
V+ is pulled to VCC, V- is pulled to ground, the transmitter
outputs are high impedance, and READY is driven low.
The time required to exit shutdown is typically 30µs
(Figure 2).
VALID RECEIVER
LEVEL
Active
Active
Active
Active
R_OUT
Yes
RECEIVER OR
TRANSMITTER
EDGE WITHIN
30s
High-Z
Active
Active
High-Z
T_OUT
Shutdown
(AutoShutdown Plus)01
Normal Operation
(AutoShutdown Plus)01
Normal Operation
(Forced On)11
Shutdown (Forced
Off)X0
OPERATION
STATUSFORCEONFORCEOFF
Yes
Yes
Active
Active
Active
Active
Active
Yes
High-Z
Active
High-Z
Active
Active
Shutdown
(AutoShutdown)INVALID**INVALID**
Normal Operation
(AutoShutdown)INVALID**INVALID**
ShutdownINVALID*1
Normal OperationINVALID*1
Normal OperationINVALID*1
Table 1. Output Control Truth Table (MAX3318E/MAX3319E)
Table 2. Shutdown and Enable Control
Truth Table (MAX3317E)
X = Don’t care
*INVALIDconnected to FORCEON
**INVALIDconnected to FORCEON and FORCEOFF
SHDNENT_OUTR_OUT0High-ZActive1High-ZHigh-Z0ActiveActive1ActiveHigh-Z

Partno	Mfg	Dc	Qty	Available	Descript
MAX3316ECAE+ \|MAX3316ECAE	MAX	N/a	13	avai	±15kV ESD-Protected, 2.5V, 1µA, 460kbps, RS-232-Compatible Transceivers
MAX3317EEUP+ \|MAX3317EEUP	MAX	N/a	143	avai	±15kV ESD-Protected, 2.5V, 1µA, 460kbps, RS-232-Compatible Transceivers
MAX3318EAP+	N/A	N/a	2500	avai	±15kV ESD-Protected, 2.5V, 1µA, 460kbps, RS-232-Compatible Transceivers
MAX3318ECUP+ \|MAX3318ECUP	MAX	N/a	13	avai	±15kV ESD-Protected, 2.5V, 1µA, 460kbps, RS-232-Compatible Transceivers
MAX3318EEUP+ \|MAX3318EEUP	MAX	N/a	2040	avai	±15kV ESD-Protected, 2.5V, 1µA, 460kbps, RS-232-Compatible Transceivers
MAX3318EUP+	N/A	N/a	2500	avai	±15kV ESD-Protected, 2.5V, 1µA, 460kbps, RS-232-Compatible Transceivers
MAX3319ECAE+ \|MAX3319ECAE	MAX	N/a	24	avai	±15kV ESD-Protected, 2.5V, 1µA, 460kbps, RS-232-Compatible Transceivers
MAX3319EEAE+ \|MAX3319EEAE	MAXIM	N/a	6	avai	±15kV ESD-Protected, 2.5V, 1µA, 460kbps, RS-232-Compatible Transceivers