ISL83070E, ISL83071E, ISL83072E, ISL83073E,
ISL83075E, ISL83076E, ISL83077E, ISL83078E
Data Sheet
October 5, 2012
±15kV ESD Protected, 3.3V, Full Fail-safe,
Low Power, High Speed or Slew Rate
Limited, RS-485/RS-422 Transceivers
The Intersil ISL8307XE are BiCMOS 3.3V powered, single
transceivers that meet both the RS-485 and RS-422
standards for balanced communication. These devices have
very low bus currents (+125mA/-100mA), so they present a
true “1/8 unit load” to the RS-485 bus. This allows up to 256
transceivers on the network without violating the RS-485
specification’s 32 unit load maximum, and without using
repeaters. For example, in a remote utility meter reading
system, individual meter readings are routed to a
concentrator via an RS-485 network, so the high allowed
node count minimizes the number of repeaters required.
Receiver (Rx) inputs feature a “Full Fail-Safe” design, which
ensures a logic high Rx output if Rx inputs are floating,
shorted, or terminated but undriven.
FN6115.5
Features
• Pb-Free (RoHS Compliant)
• RS-485 I/O Pin ESD Protection . . . . . . . . . . . . . ±15kV HBM
- Class 3 ESD Level on all Other Pins . . . . . . >7kV HBM
• Full Fail-safe (Open, Short, Terminated/Floating)
Receivers
• Hot Plug - Tx and Rx Outputs Remain Three-state During
Power-up (Only Versions with Output Enable Pins)
• True 1/8 Unit Load Allows up to 256 Devices on the Bus
• Single 3.3V Supply
• High Data Rates . . . . . . . . . . . . . . . . . . . . . . up to 20Mbps
• Low Quiescent Supply Current . . . . . . . . . . .800μA (Max)
- Ultra Low Shutdown Supply Current . . . . . . . . . . .10nA
• -7V to +12V Common Mode Input/Output Voltage Range
Hot Plug circuitry ensures that the Tx and Rx outputs remain
in a high impedance state while the power supply stabilizes.
• Half and Full Duplex Pinouts
The ISL83070E through ISL83075E utilize slew rate limited
drivers which reduce EMI, and minimize reflections from
improperly terminated transmission lines, or unterminated
stubs in multidrop and multipoint applications. Slew rate limited
versions also include receiver input filtering to enhance noise
immunity in the presence of slow input signals.
• Current Limiting and Thermal Shutdown for driver
Overload Protection
The ISL83070E, ISL83071E, ISL83073E, ISL83076E,
ISL83077E are configured for full duplex (separate Rx input
and Tx output pins) applications. The half duplex versions
multiplex the Rx inputs and Tx outputs to allow transceivers
with output disable functions in 8 lead packages.
• Three State Rx and Tx Outputs Available
• Tiny MSOP package offering saves 50% board space
Applications
• Automated Utility Meter Reading Systems
• High Node Count Systems
• Field Bus Networks
• Security Camera Networks
• Building Environmental Control/ Lighting Systems
• Industrial/Process Control Networks
TABLE 1. SUMMARY OF FEATURES
PART
NUMBER
HALF/FULL DATA RATE
DUPLEX
(Mbps)
SLEW-RATE
LIMITED?
HOT
PLUG?
# DEVICES
ON BUS
RX/TX
ENABLE?
QUIESCENT
ICC (μA)
LOW POWER
SHUTDOWN?
PIN
COUNT
ISL83070E
FULL
0.25
YES
YES
256
YES
510
YES
14
ISL83071E
FULL
0.25
YES
NO
256
NO
510
NO
8
ISL83072E
HALF
0.25
YES
YES
256
YES
510
YES
8
ISL83073E
FULL
0.5
YES
YES
256
YES
510
YES
14
ISL83075E
HALF
0.5
YES
YES
256
YES
510
YES
8
ISL83076E
FULL
20
NO
YES
256
YES
510
YES
14
ISL83077E
FULL
20
NO
NO
256
NO
510
NO
8
ISL83078E
HALF
20
NO
YES
256
YES
510
YES
8
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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