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MAX3491EEPD
Datasheet
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Maxim MAX3491EEPD, MAX3491ECSD, MAX3490EESA, MAX3490EEPA, MAX3490ECSA Datasheet

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General Description
Devices in the MAX3483E family (MAX3483E/MAX3485E/ MAX3486E/MAX3488E/MAX3490E/MAX3491E) are ±15kV ESD-protected, +3.3V, low-power transceivers for RS-485 and RS-422 communications. Each device con­tains one driver and one receiver. The MAX3483E and MAX3488E feature slew-rate-limited drivers that minimize EMI and reduce reflections caused by improperly termi­nated cables, allowing error-free data transmission at data rates up to 250kbps. The partially slew-rate-limited MAX3486E transmits up to 2.5Mbps. The MAX3485E, MAX3490E, and MAX3491E transmit at up to 12Mbps.
All devices feature enhanced electrostatic discharge (ESD) protection. All transmitter outputs and receiver inputs are protected to ±15kV using IEC 1000-4-2 Air­Gap Discharge, ±8kV using IEC 1000-4-2 Contact Discharge, and ±15kV using the Human Body Model.
Drivers are short-circuit current limited and are protect­ed against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high-impedance state. The receiver input has a fail-safe feature that guarantees a logic-high output if both inputs are open circuit.
The MAX3488E, MAX3490E, and MAX3491E feature full-duplex communication, while the MAX3483E, MAX3485E, and MAX3486E are designed for half­duplex communication.
Applications
Telecommunications Industrial-Control Local Area Networks Transceivers for EMI-Sensitive Applications Integrated Services Digital Networks Packet Switching
Features
♦ ESD Protection for RS-485 I/O Pins
±15kV—Human Body Model ±8kV—IEC 1000-4-2, Contact Discharge ±15kV—IEC 1000-4-2, Air-Gap Discharge
♦ Operate from a Single +3.3V Supply—
No Charge Pump Required
♦ Interoperable with +5V Logic ♦ Guaranteed 12Mbps Data Rate
(MAX3485E/MAX3490E/MAX3491E)
♦ Slew-Rate Limited for Errorless Data Transmission
(MAX3483E/MAX3488E)
♦ 2nA Low-Current Shutdown Mode
(MAX3483E/MAX3485E/MAX3486E/MAX3491E)
♦ -7V to +12V Common-Mode Input Voltage Range ♦ Full-Duplex and Half-Duplex Versions Available ♦ Industry-Standard 75176 Pinout
(MAX3483E/MAX3485E/MAX3486E)
♦ Current-Limiting and Thermal Shutdown for
Driver Overload Protection
MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E
3.3V -Powered, ±15kV ESD-Protected, 12Mbps and
Slew-Rate-Limited True RS-485/RS-422 Transceivers
________________________________________________________________
Maxim Integrated Products
1
19-1474; Rev 0; 4/99
PART
MAX3483ECSA
MAX3483ECPA 0°C to +70°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
8 SO 8 Plastic DIP
PART
NUMBER
GUARANTEED
DATA RATE
(Mbps)
SUPPLY
VOLTAGE
(V)
HALF/FULL
DUPLEX
SLEW-RATE
LIMITED
DRIVER/
RECEIVER
ENABLE
SHUTDOWN
CURRENT
(nA)
PIN
COUNT
MAX3483E 0.25 Half Yes Yes 2 8 MAX3485E 12 Half No Yes 2 8 MAX3486E 2.5 Half Yes Yes 2 8 MAX3488E 0.25 Full Yes No — 8 MAX3490E 12 Full No No — 8 MAX3491E 12
3.0 to 3.6
Full No Yes 2 14
Selector Guide
MAX3483EESA MAX3483EEPA -40°C to +85°C
-40°C to +85°C 8 SO 8 Plastic DIP
MAX3485ECSA MAX3485ECPA 0°C to +70°C
0°C to +70°C 8 SO
8 Plastic DIP
MAX3485EESA MAX3485EEPA -40°C to +85°C
-40°C to +85°C 8 SO 8 Plastic DIP
Ordering Information
Ordering Information continued at end of data sheet.
±15kV
ESD
PROTECTION
Yes Yes Yes Yes Yes Yes
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E
3.3V -Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(VCC= +3.3V ±0.3V, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +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.
Supply Voltage (VCC).............................................................+7V
Control Input Voltage (
RE, DE).................................-0.3V to +7V
Driver Input Voltage (DI)...........................................-0.3V to +7V
Driver Output Voltage (A, B, Y, Z).......................-7.5V to +12.5V
Receiver Input Voltage (A, B)..............................-7.5V to +12.5V
Receiver Output Voltage (RO)....................-0.3V to (V
CC
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SO (derate 5.88mW/°C above +70°C)..................471mW
8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) .....727mW
14-Pin SO (derate 8.33mW/°C above +70°C)................667mW
14-Pin Plastic DIP (derate 10mW/°C above +70°C) ......800mW
Operating Temperature Ranges
MAX34_ _ EC_ _ ...................................................0°C to +70°C
MAX34_ _ EE_ _.................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
DE = 0, V
CC
= 0 or 3.6V
DE = 0, RE = VCC, V
CC
= 0 or 3.6V, MAX3491E
DE = 0, RE = 0, V
CC
= 0 or 3.6V, MAX3491E
kΩ12R
IN
Receiver Input Resistance
µA±1I
OZR
Three-State (High-Impedance) Output Current at Receiver
V0.4V
OL
Receiver Output Low Voltage
VVCC- 0.4V
OH
Receiver Output High Voltage
mV50∆V
TH
Receiver Input Hysteresis
V-0.2 0.2V
TH
Receiver Differential Threshold Voltage
µA
-1
I
O
Output Leakage (Y, Z) in Shutdown Mode
1
µA
-20
I
O
Output Leakage (Y, Z)
V0.2∆V
OD
Change in Magnitude of Driver Differential Output Voltage for Complementary Output States (Note 1)
V
1.5
V
OD
2.0
Differential Driver Output
20
mA
-0.8
I
IN2
Input Current (A, B)
1.0
µA±2I
IN1
Logic Input Current
V3V
OC
Driver Common-Mode Output Voltage
V0.2∆V
OC
Change in Magnitude of Common-Mode Output Voltage (Note 1)
V2.0V
IH
Input High Voltage
V0.8V
IL
Input Low Voltage
UNITS
MIN TYP MAX
SYMBOLPARAMETER
RL= 54Ω or 100Ω, Figure 4
-7V ≤ VCM≤ 12V
RL= 54Ω (RS-485), Figure 4
VCC= 3.6V, 0 ≤ V
OUT
≤ V
CC
RL= 100Ω (RS-422), Figure 4
I
OUT
= 2.5mA, VID= 200mV, Figure 6
I
OUT
= -1.5mA, VID= 200mV, Figure 6
VCM= 0
V
OUT
= 12V
VIN= -7V
-7V ≤ VCM≤ 12V
V
OUT
= -7V
VIN= 12V
DE, DI, RE
RL= 54Ω or 100Ω, Figure 4
RL= 54Ω or 100Ω, Figure 4
DE, DI, RE
V
OUT
= 12V
DE, DI, RE
V
OUT
= -7V
CONDITIONS
RL= 60Ω (RS-485), VCC= 3.3V, Figure 5
1.5
mA
1.1 2.2
I
CC
Supply Current
No load, DI = 0 or V
CC
DE = VCC, RE = 0 or V
CC
DE = 0, RE = 0
0.95 1.9
V3.0 3.6V
CC
Supply Voltage Range
µA0.002 1I
SHDN
Supply Current in Shutdown Mode
DE = 0, RE = VCC, DI = VCCor 0
MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E
3.3V -Powered, ±15kV ESD-Protected, 12Mbps and
Slew-Rate-Limited True RS-485/RS-422 Transceivers
_______________________________________________________________________________________ 3
mA
-250
I
OSD
250
Driver Short-Circuit Output Current
mA±8 ±60I
OSR
Receiver Short-Circuit Output Current
UNITSMIN TYP MAXSYMBOLPARAMETER
V
OUT
= -7V
V
OUT
= 12V
0 ≤ VRO≤ V
CC
CONDITIONS
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC= +3.3V ±0.3V, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.)
ns72335t
PLH
Driver Propagation Delay, Low-to-High Level
ns31125t
TD
Mbps12 15Maximum Data Rate
Driver Differential Output Transition Time
ns650 900t
PSH
Driver-Output Enable Time from Shutdown to High Level
ns650 900t
PSL
Driver-Output Enable Time from Shutdown to Low Level
ns35 80t
PHZ
Driver-Output Disable Time from High Level
ns72335t
PHL
Driver Propagation Delay, High-to-Low Level
ns-1.4 ±8t
PDS
|
t
PLH
- t
PHL|
Driver Propagation-Delay Skew (Note 2)
ns42 90t
PZL
Driver-Output Enable Time to Low Level
ns42 90t
PZH
Driver-Output Enable Time to High Level
UNITSMIN TYP MAXSYMBOLPARAMETER
RL= 27Ω, Figure 8
RL= 60Ω, Figure 7
RL= 110Ω, Figure 9
RL= 110Ω, Figure 10
RL= 110Ω, Figure 9
RL= 27Ω, Figure 8 RL= 27Ω, Figure 8
RL= 110Ω, Figure 10 RL= 110Ω, Figure 9
CONDITIONS
DRIVER SWITCHING CHARACTERISTICS—MAX3485E/MAX3490E/MAX3491E
(VCC= +3.3V, TA= +25°C.)
ns35 80t
PLZ
Driver-Output Disable Time from Low Level RL= 110Ω, Figure 10
DRIVER SWITCHING CHARACTERISTICS—MAX3486E
(VCC= +3.3V, TA= +25°C.)
ns40 80t
PLZ
Driver-Output Disable Time from Low Level RL= 110Ω, Figure 10
ns20 42 75t
PLH
Driver Propagation Delay, Low-to-High Level
ns15 28 60t
TD
Mbps2.5Maximum Data Rate
Driver Differential Output Transition Time
ns700 1000t
PSH
Driver-Output Enable Time from Shutdown to High Level
ns700 1000t
PSL
Driver-Output Enable Time from Shutdown to Low Level
ns40 80t
PHZ
Driver-Output Disable Time from High Level
ns20 42 75t
PHL
Driver Propagation Delay, High-to-Low Level
ns-6 ±12t
PDS
|
t
PLH
- t
PHL|
Driver Propagation-Delay Skew (Note 2)
ns52 100t
PZH
Driver-Output Enable Time to High Level
UNITSMIN TYP MAXSYMBOLPARAMETER
RL= 27Ω, Figure 8
RL= 60Ω, Figure 7
RL= 110Ω, Figure 9
RL= 110Ω, Figure 10
RL= 110Ω, Figure 9
RL= 27Ω, Figure 8 RL= 27Ω, Figure 8
RL= 110Ω, Figure 9
CONDITIONS
±15IEC 1000-4-2 Air Discharge
±6
IEC 1000-4-2 Contact Discharge (MAX3490E, MAX3488E)*
±8
IEC 1000-4-2 Contact Discharge (MAX3483E, MAX3485E, MAX3486E, MAX3491E)
ns12235t
DD
Driver Differential Output Delay RL= 60Ω, Figure 7
DRIVER-OUTPUT ENABLE/DISABLE TIMES (MAX3485E/MAX3491E only)
ns20 42 70t
DD
Driver Differential Output Delay RL= 60Ω, Figure 7
ESD Protection for Y, Z, A, B
±15Human Body Model
kV
*
MAX3488E and MAX3491E will be compliant to ±8kV per IEC 1000-4-2 Contact Discharge by September 1999.
ns52 100t
PZL
Driver-Output Enable Time to Low Level RL= 110Ω, Figure 10
DRIVER-OUTPUT ENABLE/DISABLE TIMES
MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E
3.3V -Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers
4 _______________________________________________________________________________________
DRIVER SWITCHING CHARACTERISTICS—MAX3483E/MAX3488E
(VCC= +3.3V, TA= +25°C.)
ns50 80t
PLZ
Driver-Output Disable Time from Low Level RL= 110Ω, Figure 10
ns700 930 1500t
PLH
Driver Propagation Delay, Low-to-High Level
ns400 740 1200t
TD
kbps250Maximum Data Rate
Driver Differential Output Transition Time
µs2.2 3.0t
PSH
Driver-Output Enable Time from Shutdown to High Level
µs1.9 2.7t
PSL
Driver-Output Enable Time from Shutdown to Low Level
ns50 80t
PHZ
Driver-Output Disable Time from High Level
ns700 930 1500t
PHL
Driver Propagation Delay, High-to-Low Level
ns±50t
PDS
|
t
PLH
- t
PHL|
Driver Propagation-Delay Skew (Note 2)
ns600 800t
PZH
Driver-Output Enable Time to High Level
UNITSMIN TYP MAXSYMBOLPARAMETER
RL= 27Ω, Figure 8
RL= 60Ω, Figure 7
RL= 110Ω, Figure 9
RL= 110Ω, Figure 10
RL= 110Ω, Figure 9
RL= 27Ω, Figure 8 RL= 27Ω, Figure 8
RL= 110Ω, Figure 9
CONDITIONS
RECEIVER SWITCHING CHARACTERISTICS
(VCC= +3.3V, TA= +25°C.)
ns25 45t
PRLZ
Receiver-Output Disable Time from Low Level
CL= 15pF, Figure 12, MAX3483E/85E/86E/91E only
ns
25 62 90
ns80 190 300t
SHDN
Time to Shutdown
ns720 1400t
PRSH
Receiver-Output Enable Time from Shutdown to High Level
ns720 1400t
PRSL
Receiver-Output Enable Time from Shutdown to Low Level
ns25 45t
PRHZ
Receiver-Output Disable Time from High Level
ns
25 62 90
ns
6±10
ns25 50t
PRZL
Receiver-Output Enable Time to Low Level
ns25 50t
PRZH
Receiver-Output Enable Time to High Level
UNITSMIN TYP MAXSYMBOLPARAMETER
VID= 0 to 3.0V, CL= 15pF, Figure 11
MAX3483E/MAX3485E/MAX3486E/MAX3491E only (Note 3)
CL= 15pF, Figure 12, MAX3483E/85E/86E/91E only
CL= 15pF, Figure 12, MAX3483E/85E/86E/91E only
CL= 15pF, Figure 12, MAX3483E/85E/86E/91E only
VID= 0 to 3.0V, CL= 15pF, Figure 11
VID= 0 to 3.0V, CL= 15pF, Figure 11
CL= 15pF, Figure 12, MAX3483E/85E/86E/91E only
CL= 15pF, Figure 12, MAX3483E/85E/86E/91E only
CONDITIONS
25 75 120
t
RPLH
Receiver Propagation Delay, Low-to-High Level
MAX3483E/MAX3488E
25 75 120
t
RPHL
Receiver Propagation Delay, High-to-Low Level
MAX3483E/MAX3488E
12 ±20
t
RPDS
|
t
PLH
- t
PHL|
Receiver
Propagation-Delay Skew
MAX3483E/MAX3488E
Note 1: ∆VODand ∆VOCare the changes in VODand VOC, respectively, when the DI input changes state. Note 2: Measured on
|t
PLH
(Y) - t
PHL
(Y)| and |t
PLH
(Z) - t
PHL
(Z)|.
Note 3: The transceivers are put into shutdown by bringing RE high and DE low. If the inputs are in this state for less than 80ns, the
devices are guaranteed not to enter shutdown. If the inputs are in this state for at least 300ns, the devices are guaranteed to have entered shutdown. See
Low-Power Shutdown Mode
section.
ns900 1300t
PZL
Driver-Output Enable Time to Low Level RL= 110Ω, Figure 10
ns600 900 1400t
DD
Driver Differential Output Delay RL= 60Ω, Figure 7
DRIVER-OUTPUT ENABLE/DISABLE TIMES (MAX3483E only)
MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E
3.3V -Powered, ±15kV ESD-Protected, 12Mbps and
Slew-Rate-Limited True RS-485/RS-422 Transceivers
_______________________________________________________________________________________
5
Typical Operating Characteristics
(VCC= +3.3V, TA= +25°C, unless otherwise noted.)
25
20
15
10
5
0
0 0.5 1.0 1.5 2.0 2.5 3.53.0
OUTPUT CURRENT vs.
RECEIVER OUTPUT LOW VOLTAGE
MAX3483E-01
OUTPUT LOW VOLTAGE (V)
OUTPUT CURRENT (mA)
-20
-18
-16
-14
-12
-10
-8
-6
-4
-2 0
0 0.5 1.0 1.5 2.0 2.5 3.53.0
OUTPUT CURRENT vs.
RECEIVER OUTPUT HIGH VOLTAGE
MAX3483E-02
OUTPUT HIGH VOLTAGE (V)
OUTPUT CURRENT (mA)
3.00
3.05
3.10
3.15
3.20
3.25
3.30
-40 -20 0 20 40 60 10080
RECEIVER OUTPUT HIGH VOLTAGE
vs. TEMPERATURE
MAX3483E-03
TEMPERATURE (°C)
OUTPUT HIGH VOLTAGE (V)
IRO = 1.5mA
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
-40 -20 0 20 40 60 10080
RECEIVER OUTPUT LOW VOLTAGE
vs. TEMPERATURE
MAX3483E-04
TEMPERATURE (°C)
OUTPUT LOW VOLTAGE (V)
IRO = 2.5mA
25
0
50
75
100
125
150
175
0246 81012
OUTPUT CURRENT vs.
DRIVER OUTPUT LOW VOLTAGE
MAX3483E-07
OUTPUT LOW VOLTAGE (V)
OUTPUT CURRENT (mA)
100
90 80 70 60 50 40 30 20
10
0
0 0.5 1.0 1.5 2.0 2.5 3.53.0
DRIVER OUTPUT CURRENT vs.
DIFFERENTIAL OUTPUT VOLTAGE
MAX3483E-05
DIFFERENTIAL OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.6
2.5
-40 -20 0 20 40 60 10080
DRIVER DIFFERENTIAL OUTPUT
VOLTAGE vs. TEMPERATURE
MAX3483E-06
TEMPERATURE (°C)
DIFFERENTIAL OUTPUT VOLTAGE (V)
R = 54Ω
0
-100
-80
-60
-40
-20
543210
-7 -6 -3-4-5 -2 -1
OUTPUT CURRENT vs.
DRIVER OUTPUT HIGH VOLTAGE
MAX3483E-08
OUTPUT HIGH VOLTAGE (V)
OUTPUT CURRENT (mA)
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