MAX3291CSD+-MAX3291CSD+T-MAX3291ESD+-MAX3292CSD+-MAX3292ESD+ Fast Delivery |IC PHOENIX CO.,LIMITED

MAX3291CSD+T ,RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance CommunicationELECTRICAL CHARACTERISTICS(Typical Operating Circuit, V = +5V ±5%, R = 0 (MAX3292), V = V (MAX3292) ..
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MAX3291ESD ,RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance CommunicationELECTRICAL CHARACTERISTICS(Typical Operating Circuit, V = +5V ±5%, R = 0 (MAX3292), V = V (MAX3292) ..
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MAX3292CSD ,RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance CommunicationFeaturesThe MAX3291/MAX3292 high-speed RS-485/RS-422' Preemphasis Increases the Distance and Datatr ..
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MAX694EPA ,Microprocessor Supervisory Circuits19-02 18; He V 2; 4/95
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MAX3291CSD+-MAX3291CSD+T-MAX3291ESD+-MAX3292CSD+-MAX3292ESD+
RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication
RS-485/RS-422 Transceivers with Preemphasis
for High-Speed, Long-Distance Communication
19-1405; Rev 1; 4/99
________________General Description
The MAX3291/MAX3292 high-speed RS-485/RS-422
transceivers feature driver preemphasis circuitry, which
extends the distance and increases the data rate of reli-
able communication by reducing intersymbol interfer-
ence (ISI) caused by long cables. The MAX3291 is
programmable for data rates of 5Mbps to 10Mbps,
while the MAX3292 is programmable for data rates up
to 10Mbps by using a single external resistor.
The MAX3291/MAX3292 are full-duplex devices that
operate from a single +5V supply and offer a low-cur-
rent shutdown mode that reduces supply current to
100nA. They feature driver output short-circuit current
limiting and a fail-safe receiver input that guarantees a
logic-high output if the input is open circuit. A 1/4-unit-
load receiver input impedance allows up to 128 trans-
ceivers on the bus.
________________________Applications
Long-Distance, High-Speed RS-485/RS-422
Communications
Telecommunications
Industrial-Control Local Area Networks
____________________________FeaturesPreemphasis Increases the Distance and Data
Rate of Reliable RS-485/RS-422 CommunicationData Rate
Optimized for 5Mbps to 10Mbps (MAX3291)
Programmable up to 10Mbps (MAX3292)100nA Low-Current Shutdown ModeAllow Up to 128 Transceivers on the Bus-7V to +12V Common-Mode Input Voltage RangePin-Compatible with ’75180, MAX489, MAX491
MAX3080, MAX3083, MAX3086, MAX1482
PEE
(PSET)
R = ZO
R = ZOR = ZO
R = ZO1
1μF
RPSET*
CPSET*CPSET*
7(6)GND( ) ARE FOR MAX3292
* MAX3292 ONLY
ZO = THE CHARACTERISTIC
IMPEDANCE OF THE CABLE5
7(6)GND2
VCC
(VCCD)(VCCD)
PEE
(PSET)141
1μF
RPSET*
VCC
MAX3291
MAX3292
MAX3291
MAX3292
Typical Operating Circuit and Functional Diagram
PART
MAX3291CSD
MAX3291CPD
MAX3291ESD-40°C to +85°C
0°C to +70°C
0°C to +70°C
TEMP. RANGEPIN-PACKAGE
14 SO
14 Plastic DIP
14 SO
_______________Ordering Information
MAX3291EPD-40°C to +85°C14 Plastic DIP
MAX3292CSD
MAX3292CPD
MAX3292ESD-40°C to +85°C
0°C to +70°C
0°C to +70°C14 SO
14 Plastic DIP
14 SO
MAX3292EPD-40°C to +85°C14 Plastic DIP
RS-485/RS-422 Transceivers with Preemphasis
for High-Speed, Long-Distance Communication
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(Typical Operating Circuit, VCC= +5V ±5%, RPSET= 0 (MAX3292), VCC= VCCD(MAX3292), TA= TMINto TMAX, unless otherwise
noted. Typical values are at VCC= +5V and TA= +25°C.) (Note 1)
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.
Supply Voltage (VCC, VCCD) .................................................+6V
Control Input Voltage (RE, DE, PEE,
PSET, DI).................................................-0.3V to (VCC+ 0.3V)
Driver Output Voltage (Y, Z)................................-7.5V to +12.5V
Receiver Input Voltage (A, B)..............................-7.5V to +12.5V
Receiver Output Voltage (RO)....................-0.3V to (VCC+ 0.3V)
Continuous Power Dissipation (TA= +70°C)
14-Pin SO (derate 8.7mW/°C above +70°C).................695mW
14-Pin Plastic DIP (derate 10.0mW/°C above +70°C)..800mW
Operating Temperature Ranges
MAX329_C_ D......................................................0°C to +70°C
MAX329_E_ D...................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
R = 27Ω
DE = GND,
VCC= GND or 5.25V
VPSET= VCC
DE, DI, RE
DE, DI, RE, PEE
DE, DI, RE
CONDITIONS2.4VODPDifferential Driver Output with
Preemphasis-25IOOutput Leakage (Y and Z)2570110IPSETPSET Input Current (MAX3292)2.4VIHInput High Voltage0.8VILInput Low Voltage±2IINInput Current-15-30-45IPEEPEE Input Current (MAX3291)
UNITSMINTYPMAXSYMBOLPARAMETER
Figure 1, R = 27Ω(Note 3)V1.652.02.35DPERDifferential Driver
Preemphasis Ratio
Figure 1, R = 27Ω(Note 4)V0.2ΔVOD,
ΔVODP
Change in Magnitude of
Differential Output Voltage
(Normal and Preemphasis)
Figure 1, R = 27ΩVVCC / 23VOC
Driver Common-Mode Output
Voltage (Normal and
Preemphasis)
Figure 1, R = 27Ω(Note 5)V0.3ΔVOC
Change in Magnitude of
Common-Mode Voltage
(Normal and Preemphasis)
Figure 1, R = 27ΩmV50ΔVNP
Change in Magnitude of
Common-Mode Output
Voltage (Normal to
Preemphasis)
-7V ≤VOUT≤+12V (Note 6)mA±30±250IOSDDriver Short-Circuit Output
Current= VZ= +12V= VZ= -7V
R = 27ΩFigure 1No load (Note 2)V5.25VOD1.55.0Differential Driver Output
PEE3.75
DRIVER
RS-485/RS-422 Transceivers with Preemphasis
for High-Speed, Long-Distance Communication
DC ELECTRICAL CHARACTERISTICS (continued)
(Typical Operating Circuit, VCC= +5V ±5%, RPSET= 0 (MAX3292), VCC = VCCD(MAX3292), TA= TMINto TMAX, unless otherwise
noted. Typical values are at VCC= +5V and TA= +25°C.) (Note 1)
SWITCHING CHARACTERISTICS
(Typical Operating Circuit, VCC= +5V ±5%, RPSET= 0 (MAX3292), VCC= VCCD(MAX3292), TA= +25°C, unless otherwise noted.
Typical values are at VCC= +5V and TA= +25°C.)
-7V ≤VCM≤+12V= VCC, DE = GND, VY= VZ= 0 to VCCor
floating= GND, DE = VCC
0 ≤VO≤VCC
-7V ≤VCM≤+12V
0 ≤VRO≤VCC
CONDITIONS-200200VTHReceiver Differential
Threshold Voltage0.11ISHDNSupply Current in Shutdown
Mode2.03.0ICC + ICCDNo-Load Supply Current0.1±1IOZRThree-State Output Current at
Receiver48RINReceiver Input Resistance±15±95IOSRReceiver Output Short-Circuit
Current
UNITSMINTYPMAXSYMBOLPARAMETER= VB= 0mV35ΔVTHReceiver Input Hysteresis= -4mA, VA- VB= VTHV3.5VOHReceiver Output High Voltage= 4mA, VA- VB= -VTHV0.4VOLReceiver Output Low Voltage
DE = GND,
VCC= GND or 5.25VμA-150IA, B250Input Current (A and B)VIN= +12V
VIN= -7V
Driver Differential Output
Rise or Fall Time
Figures 3 and 5, RDIFF= 54Ω,
CL1= CL2= 50pFns4465tDPHLDriver Propagation Delay
CONDITIONS
tHL12Figures 3 and 5, RDIFF= 54Ω,
CL1= CL2= 50pF nstLH
Differential Driver Output
Skew  tDPLH- tDPHL
Figures 3 and 10, RDIFF= 54Ω,
CL1= CL2= 50pFns30tPTNDPreemphasis Voltage Level to
Normal Voltage Level Delay
tDSKEWFigures 3 and 5, RDIFF= 54Ω,
CL1= CL2= 50pF38ns
Mbps10fMAXMaximum Data Rate65tDPLH
UNITSMINTYPMAXSYMBOLPARAMETER
RECEIVER
SUPPLY CURRENT
Driver Preemphasis IntervaltPRE100120Figures 3 and 10,
RDIFF= 54Ω,
CL1= CL2= 50pF
0.7511.25μsMAX3292,
RPSET= 523kΩ
MAX3291/MAX3292,
RPSET= 0
RS-485/RS-422 Transceivers with Preemphasis
for High-Speed, Long-Distance Communication
SWITCHING CHARACTERISTICS (continued)
(Typical Operating Circuit, VCC= +5V ±5%, RPSET= 0 (MAX3292), VCC= VCCD(MAX3292), TA= +25°C, unless otherwise noted.
Typical values are at VCC= +5V and TA= +25°C.)
Note 1:All currents into the device are positive; all currents out of the device are negative. All voltages are referenced to device
ground unless otherwise noted.
Note 2:Guaranteed by design.
Note 3:DPER is defined as (VODP / VOD).
Note 4:ΔVODPand ΔVOCare the changes in VDDand VOC, respectively, when the DI input changes. This specification reflects
constant operating conditions. When operating conditions shift, the maximum value may be momentarily exceeded.
Note 5:ΔVODPand ΔVOCare the changes in VODand VOC, respectively, when the DI input changes state.
Note 6:Maximum current level applies to peak current just prior to foldback-current limiting; minimum current level applies during
current limiting.
Note 7:Shutdown is enabled by bringing REhigh and DE low. If the enable inputs are in this state for less than 50ns, the device is
guaranteed not to enter shutdown. If the enable inputs are in this state for at least 500ns, the device is guaranteed to have
Figures 2 and 6, S2 closed, RL= 500Ω, = 100pF
Figures 2 and 6, RL= 500Ω, CL= 100pF,
S2 closed
CONDITIONS60008750tDZH(SHDN)Driver Enable from Shutdown
to Output High
UNITSMINTYPMAXSYMBOLPARAMETER
Figures 4 and 11 (Note 7)ns50160500tSHDNTime to Shutdown
Figures 2 and 8, RL= 1kΩ, CL= 100pF,
S1 closedns34355tRZLReceiver Enable to Output
Low
Figures 2 and 8, RL= 1kΩ, CL= 15pF,
S1 closedns
Figures 2 and 8, RL= 1kΩ, CL= 100pF,
S2 closed45tRLZReceiver Disable Time from
Low34355tRZHReceiver Enable to Output
High
Figures 2 and 8, RL= 1kΩ, CL= 15pF,
S2 closedns2545tRHZReceiver Disable Time from
High
Figures 2 and 6, RL= 500Ω, CL= 100pF,
S1 closed ns60008750tDZL(SHDN)Driver Enable from Shutdown
to Output Low
Figures 2 and 8, RL= 1kΩ, CL= 100pF,
S1 closed ns301500tRZL(SHDN)Receiver Enable from
Shutdown to Output Low
Figures 2 and 8, RL= 1kΩ, CL= 100pF,
S2 closedns8501500tRZH(SHDN)Receiver Enable from
Shutdown to Output High
Figures 7 and 9, CL= 100pFns3tRSKEWReceiver Output SkewtRPLH- tRPHL
Driver Enable to Output HightDZH72105
Figures 7 and 9, CL= 50pF, VID= 2V,
VCM= 0Receiver Propagation DelaytRPHL5285ns4985tRPLH
Figures 2 and 6, S2 closed, RL= 500Ω, = 15pFDriver Disable Time from HightDHZ71100ns
Figures 2 and 6, S1 closed, RL= 500Ω, = 15pFDriver Disable Time from LowtDLZ53100ns
Figures 2 and 6, S1 closed, RL= 500Ω, = 100pFDriver Enable to Output LowtDZL55105ns
RS-485/RS-422 Transceivers with Preemphasis
for High-Speed, Long-Distance Communication
TYPICAL PREEMPHASIS WAVEFORM
X3291/2-01
100ns/div
VY - VZ2V/
div
PREEMPHASIS INTERVAL vs. RPSET
(CPSET = 0.1μF)
X3291/2-02
RPSET (kΩ)
IN
(n
NOTE A
NOTE A
RPRE AND tPRE vs. tBAUD
AX3291/92 toc 03
tBAUD (ns)
(k
DRIVER DIFFERENTIAL
OUTPUT VOLTAGE vs. RDIFF
AX3291/2-04
RDIFF (Ω)
(VSTRONG
NORMAL
DRIVER PROPAGATION DELAY
vs. TEMPERATURE
AX3291/2-07
TEMPERATURE (°C)
(n
CL1 = CL2 = 50pF
DRIVER DIFFERENTIAL
OUTPUT VOLTAGE vs. TEMPERATURE
AX3291/2-05
TEMPERATURE (°C)
(VSTRONG (VODP)
RDIFF = 54Ω
NORMAL (VOD)
RECEIVER PROPAGATION DELAY
vs. TEMPERATURE
AX3291/2-06
TEMPERATURE (°C)
(n
CL = 50pF
RECEIVER PROPAGATION DELAY
AX3291/2-08
20ns/div
VA - VB
2.5V/
div
5V/
div
__________________________________________Typical Operating Characteristics
(VCC= +5V, TA= +25°C, unless otherwise noted.)
Note A:Dotted line represents region in which preemphasis may not work in systems with excessive power-supply noise. See
Preemphasis at Low Data Rates.
RS-485/RS-422 Transceivers with Preemphasis
for High-Speed, Long-Distance Communication___________________________________Typical Operating Characteristics (continued)
(VCC= +5V, TA= +25°C, unless otherwise noted.)
NO-LOAD SUPPLY CURRENT
vs. TEMPERATURE
AX3291/2-12
TEMPERATURE (°C)
(m1.01.50.52.02.53.03.54.04.55.0
OUTPUT SINK CURRENT vs.
RECEIVER OUTPUT LOW VOLTAGE
AX3291/2-13
OUTPUT LOW VOLTAGE (V)
(m
RECEIVER OUTPUT LOW VOLTAGE
vs. TEMPERATURE
AX3291/2-10
TEMPERATURE (°C)
(V
IRO = 8mA1.01.50.52.02.53.03.54.04.55.0
OUTPUT SOURCE CURRENT vs.
RECEIVER OUTPUT HIGH VOLTAGE
AX3291/2-14
OUTPUT HIGH VOLTAGE (V)
(m
RECEIVER OUTPUT HIGH VOLTAGE
vs. TEMPERATURE
AX3291/2-11
TEMPERATURE (°C)
(V
IRO = 8mA
DRIVER PROPAGATION DELAY
AX3291/2-09
20ns/div
VY - VZ
2.5V/
div
5V/
div
RS-485/RS-422 Transceivers with Preemphasis
for High-Speed, Long-Distance Communication
Pin Description
Preemphasis Enable Input. To enable preemphasis, leave PEE unconnected, connect to
VCC, or drive high. To enable strong-level-drive only mode, connect PEE to GND or drive
low.
PEE1—
Preemphasis Set Input. Sets the preemphasis interval. Connect a resistor (RPSET) in paral-
lel with a capacitor (CPSET) from PSET to VCCto set the preemphasis interval. See Typical
Operating Circuit.
PSET—1
Receiver Output Enable. Drive RElow to enable RO; RO is high impedance when REis
high. Drive REhigh and DE low to enter low-power shutdown mode.RE33
Receiver Output. When REis low and if A - B ≥200mV, RO is high; if A - B ≤-200mV, RO
is low.RO22
Driver Input. With DE high, a low on DI forces the noninverting output low and the inverting
output high. Similarly, a high on DI forces the noninverting output high and the inverting
output low.55
GroundGND76, 7
No Connection. Not internally connected.N.C.6, 8, 138
Driver Output Enable. Drive DE high to enable the driver outputs. These outputs are high
impedance when DE is low. Drive REhigh and DE low to enter low-power shutdown mode.DE44
Noninverting Driver OutputY99
Inverting Receiver InputB1111
Connect to VCCVCCD—13
Noninverting Receiver InputA1212
Inverting Driver OutputZ1010
PIN
MAX3291
FUNCTIONNAME
MAX3292
VOD
VODP
VOC
Figure 1. Driver DC Test Load
OUTPUT
UNDER TESTS1
VCC
Figure 2. Driver or Receiver Enable/Disable Timing Test Load
Positive Supply: +4.75V ≤VCC≤+5.25VVCC1414
RS-485/RS-422 Transceivers with Preemphasis
for High-Speed, Long-Distance Communication
CL1
CL2
RDIFFVODP
DE = LOW
t > tSHDNt < tSHDN
tRZH(SHDN)
Figure 3. Driver Timing Test CircuitFigure 4. Shutdown Timing DiagramYPZPZPYPYN
0 DIFFERENTIAL
0 DIFFERENTIAL
1.5V
tDPLH
20%80%80%
tDPHL
1.5V
20%
tHLtLH
VDIFF = VY - VZ
VDIFF
tSKEW = | tPLH - tPHL |
| YN - ZN | = VOD
| YP - ZP | = VODP
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
Y, Z
Y, Z
1.5V1.5V
VPH
VPL
VOL* + 0.5V
VOH* - 0.5V2.3V
*NOTE: VOH AND VOL ARE THE OUTPUT LEVELS IN FIGURE 2 WITH
S2 AND S1 CLOSED, RESPECTIVELY.
2.3V
tDZL(SHDN), tDZLtDLZ
tDZH(SHDN), tDZHtDHZ
Figure 5. Driver Propagation DelaysFigure 6. Driver Enable and Disable Times
VOH
VOL+1V-1V
0 DIFFERENTIAL
1.5V
tRPHLtRPLH
1.5V
tRSKEW = | tRPLH - tRPHL |
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
VCC
1.5V1.5V
VOL + 0.5V
VOH - 0.5V1.5V
1.5V
tRZL(SHDN), tRZLtRLZ
tRZH(SHDN), tRZHtRHZ
Figure 7. Receiver Propagation DelaysFigure 8. Receiver Enable and Disable Times

Partno	Mfg	Dc	Qty	Available	Descript
MAX3291CSD+ \|MAX3291CSD	MAXIM	N/a	7	avai	RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication
MAX3291CSD+T \|MAX3291CSDT	MAXIM	N/a	443	avai	RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication
MAX3291ESD+ \|MAX3291ESD	MAXIM	N/a	9	avai	RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication
MAX3292CSD+ \|MAX3292CSD	MAXIM	N/a	100	avai	RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication
MAX3292ESD+ \|MAX3292ESD	MAXIM	N/a	15	avai	RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication
MAX3292ESD+ \|MAX3292ESD	MAX	N/a	2	avai	RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication