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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX3485E Datasheet

12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers

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19-1474; Rev 0; 4/99
3.3V-Powered, ±15kV ESD-Protected, 12Mbps and
Slew-Rate-Limited True RS-485/RS-422 Transceivers
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 con-
tains one driver and one receiver. The MAX3483E and
MAX3488E feature slew-rate-limited drivers that minimize
EMI and reduce reflections caused by improperly termi-
nated 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 Air-
Gap Discharge, ±8kV using IEC 1000-4-2 Contact
Discharge, and ±15kV using the Human Body Model.
Drivers are short-circuit current limited and are protect-
ed 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 half-
duplex communication.
Applications
Telecommunications
Industrial-Control Local Area Networks
Transceivers for EMI-Sensitive Applications
Integrated Services Digital Networks
Packet Switching
Features
o 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
o Operate from a Single +3.3V Supply—
No Charge Pump Required
o Interoperable with +5V Logic
o Guaranteed 12Mbps Data Rate
(MAX3485E/MAX3490E/MAX3491E)
o Slew-Rate Limited for Errorless Data Transmission
(MAX3483E/MAX3488E)
o 2nA Low-Current Shutdown Mode
(MAX3483E/MAX3485E/MAX3486E/MAX3491E)
o -7V to +12V Common-Mode Input Voltage Range
o Full-Duplex and Half-Duplex Versions Available
o Industry-Standard 75176 Pinout
(MAX3483E/MAX3485E/MAX3486E)
o Current-Limiting and Thermal Shutdown for
Driver Overload Protection
Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX3483ECSA
0°C to +70°C
8 SO
MAX3483ECPA
0°C to +70°C
8 Plastic DIP
MAX3483EESA -40°C to +85°C
8 SO
MAX3483EEPA -40°C to +85°C
8 Plastic DIP
MAX3485ECSA
0°C to +70°C
8 SO
MAX3485ECPA
0°C to +70°C
8 Plastic DIP
MAX3485EESA -40°C to +85°C
8 SO
MAX3485EEPA -40°C to +85°C
8 Plastic DIP
Ordering Information continued at end of data sheet.
Selector Guide
PART
NUMBER
MAX3483E
MAX3485E
MAX3486E
MAX3488E
MAX3490E
MAX3491E
GUARANTEED SUPPLY
DATA RATE VOLTAGE
(Mbps)
(V)
HALF/FULL
DUPLEX
SLEW-RATE
LIMITED
DRIVER/
RECEIVER
ENABLE
SHUTDOWN
CURRENT
(nA)
±15kV
ESD
PROTECTION
PIN
COUNT
0.25
Half Yes Yes
2
Yes 8
12
Half No Yes
2
Yes 8
2.5 Half
3.0 to 3.6
0.25 Full
12 Full
12 Full
Yes Yes
Yes No
No No
No Yes
2
2
Yes 8
Yes 8
Yes 8
Yes 14
________________________________________________________________ Maxim Integrated Products 1
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX3485E Datasheet

12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers

No Preview Available !

3.3V-Powered, ±15kV ESD-Protected, 12Mbps and
Slew-Rate-Limited True RS-485/RS-422 Transceivers
ABSOLUTE MAXIMUM RATINGS
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 (VCC + 0.3V)
Continuous Power Dissipation (TA = +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
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.
DC ELECTRICAL CHARACTERISTICS
(VCC = +3.3V ±0.3V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Differential Driver Output
RL = 100(RS-422), Figure 4
VOD RL = 54(RS-485), Figure 4
RL = 60(RS-485), VCC = 3.3V, Figure 5
2.0
1.5
1.5
V
Change in Magnitude of Driver
Differential Output Voltage for
Complementary Output States
(Note 1)
VOD RL = 54or 100, Figure 4
0.2 V
Driver Common-Mode Output
Voltage
VOC RL = 54or 100, Figure 4
3V
Change in Magnitude of
Common-Mode Output Voltage
(Note 1)
VOC RL = 54or 100, Figure 4
0.2 V
Input High Voltage
Input Low Voltage
Logic Input Current
Input Current (A, B)
Output Leakage (Y, Z)
Output Leakage (Y, Z)
in Shutdown Mode
Receiver Differential
Threshold Voltage
VIH DE, DI, RE
VIL DE, DI, RE
IIN1 DE, DI, RE
IIN2
DE = 0,
VCC = 0 or 3.6V
VIN = 12V
VIN = -7V
IO
DE = 0, RE = 0,
VOUT = 12V
VCC = 0 or 3.6V, MAX3491E VOUT = -7V
IO
DE = 0, RE = VCC,
VOUT = 12V
VCC = 0 or 3.6V, MAX3491E VOUT = -7V
VTH -7V VCM 12V
2.0
-0.2
V
0.8 V
±2 µA
1.0
mA
-0.8
20
µA
-20
1
µA
-1
0.2 V
Receiver Input Hysteresis
Receiver Output High Voltage
Receiver Output Low Voltage
VTH
VOH
VOL
VCM = 0
IOUT = -1.5mA, VID = 200mV, Figure 6
IOUT = 2.5mA, VID = 200mV, Figure 6
50 mV
VCC - 0.4
V
0.4 V
Three-State (High-Impedance)
Output Current at Receiver
IOZR VCC = 3.6V, 0 VOUT VCC
±1 µA
Receiver Input Resistance
Supply Voltage Range
RIN
VCC
Supply Current
ICC
Supply Current in Shutdown Mode ISHDN
-7V VCM 12V
No load,
DI = 0 or VCC
DE = VCC, RE = 0 or VCC
DE = 0, RE = 0
DE = 0, RE = VCC, DI = VCC or 0
12
3.0
1.1
0.95
0.002
3.6
2.2
1.9
1
k
V
mA
µA
2 _______________________________________________________________________________________


Part Number MAX3485E
Description 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers
Maker Maxim Integrated
Total Page 16 Pages
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