ISL3170E, ISL3171E, ISL3172E, ISL3173E, ISL3174E,
®
ISL3175E, ISL3176E, ISL3177E, ISL3178E
Data Sheet
June 10, 2008
FN6307.4
±15kV ESD Protected, 3.3V, Full Fail-Safe,
Low Power, High Speed or Slew Rate
Limited, RS-485/RS-422 Transceivers
Features
• IEC61000 ESD Protection on RS-485 I/O Pins . . . . . ±15kV
- Class 3 ESD Level on all Other Pins . . . . . . >7kV HBM
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.
• 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
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.
• -7V to +12V Common Mode Input/Output Voltage Range
• Half and Full Duplex Pinouts
• Three State Rx and Tx Outputs Available
Hot Plug circuitry ensures that the Tx and Rx outputs remain
in a high impedance state while the power supply stabilizes.
• Current Limiting and Thermal Shutdown for driver
Overload Protection
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.
• Tiny MSOP Packages Consume 50% Less Board Space
• Pb-Free (RoHS Compliant)
Applications
• Automated Utility Meter Reading Systems
• High Node Count Systems
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.
• 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 SLEW-RATE
HOT
PLUG?
#DEVICES
ON BUS
RX/TX
ENABLE?
QUIESCENT
(µA)
LOW POWER
SHUTDOWN? COUNT
PIN
DUPLEX
FULL
FULL
HALF
FULL
FULL
HALF
FULL
FULL
HALF
(Mbps)
0.25
0.25
0.25
0.5
LIMITED?
YES
YES
YES
YES
YES
YES
NO
I
CC
510
ISL3170E
ISL3171E
ISL3172E
ISL3173E
ISL3174E
ISL3175E
ISL3176E
ISL3177E
ISL3178E
YES
NO
256
256
256
256
256
256
256
256
256
YES
NO
YES
NO
10, 14
510
510
510
510
510
510
510
510
8
YES
YES
NO
YES
YES
NO
YES
YES
NO
8
10, 14
0.5
8
0.5
YES
YES
NO
YES
YES
NO
YES
YES
NO
8
20
10, 14
20
NO
8
8
20
NO
YES
YES
YES
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2006-2008. All Rights Reserved
1
All other trademarks mentioned are the property of their respective owners.
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