1
FN6307.5
ISL3170E, ISL3171E, ISL3172E, ISL3173E, ISL3174E,
ISL3175E, ISL3176E, ISL3177E, ISL3178E
±15kV ESD Protected, 3.3V, Full Fail-Safe,
Low Power, High Speed or Slew Rate
Limited, RS-485/RS-422 Transceivers
The Intersil ISL317XE are ±15kV IEC61000 ESD Protected,
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.
Hot Plug circuitry ensures that the Tx and Rx outputs remain
in a high impedance state while the power supply stabilizes.
The ISL3170E through ISL3175E 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.
The ISL3170E, ISL3171E, ISL3173E, ISL3174E, ISL3176E,
ISL3177E 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 Ld packages.
Features
IEC61000 ESD Protection on RS-485 I/O Pins . . . . . ±15kV
- 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
Half and Full Duplex Pinouts
Three State Rx and Tx Outputs Available
Current Limiting and Thermal Shutdown for driver
Overload Protection
Tiny MSOP Packages Consume 50% Less Board Space
Pb-Free (RoHS Compliant)
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
DUPLEX
DATA RATE
(Mbps)
SLEW-RATE
LIMITED?
HOT
PLUG?
# DEVICES
ON BUS
RX/TX
ENABLE?
QUIESCENT
ICC (A)
LOW POWER
SHUTDOWN?
PIN
COUNT
ISL3170E
FULL
0.25
YES
256
YES
510
YES
10, 14
ISL3171E
FULL
0.25
YES
NO
256
NO
510
NO
8
ISL3172E
HALF
0.25
YES
256
YES
510
YES
8
ISL3173E
FULL
0.5
YES
256
YES
510
YES
10, 14
ISL3174E
FULL
0.5
YES
NO
256
NO
510
NO
8
ISL3175E
HALF
0.5
YES
256
YES
510
YES
8
ISL3176E
FULL
20
NO
YES
256
YES
510
YES
10, 14
ISL3177E
FULL
20
NO
256
NO
510
NO
8
ISL3178E
HALF
20
NO
YES
256
YES
510
YES
8
Data Sheet
June 8, 2012
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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