ISL3170E Datasheet, PDF (1/19 Pages) Intersil Corporation – ±15kV ESD Protected, 3.3V, Full Fail-safe, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers

ISL3170E, ISL3171E, ISL3172E, ISL3173E, ISL3174E,
®
ISL3175E, ISL3176E, ISL3177E, ISL3178E
Data Sheet
August 28, 2006
FN6307.2
±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 (+125μA/-100μA),
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.
Features
• IEC61000 ESD Protection on RS-485 I/O Pins . . . . . ±15kV
- Class 3 ESD Level on all Other Pins . . . . . . >7kV HBM
• Pb-Free Plus Anneal Available (RoHS Compliant)
• Full Fail-safe (Open, Short, Terminated/Floating)
Receivers
• Hot Plug - Tx and Rx Outputs Remain Three-state During
Power-up
• 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
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 lead packages.
• Current Limiting and Thermal Shutdown for driver
Overload Protection
• Tiny MSOP Packages Consume 50% Less 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
ISL3170E
HALF/FULL DATA RATE SLEW-RATE
DUPLEX
(Mbps)
LIMITED?
FULL
0.25
YES
HOT
PLUG?
YES
# DEVICES
ON BUS
256
RX/TX
ENABLE?
YES
QUIESCENT
I_CC (μA)
510
LOW POWER
SHUTDOWN?
YES
PIN
COUNT
10, 14
ISL3171E
FULL
0.25
YES
YES
256
NO
510
NO
8
ISL3172E
HALF
0.25
YES
YES
256
YES
510
YES
8
ISL3173E
FULL
0.5
YES
YES
256
YES
510
YES
10, 14
ISL3174E
FULL
0.5
YES
YES
256
NO
510
NO
8
ISL3175E
HALF
0.5
YES
YES
256
YES
510
YES
8
ISL3176E
FULL
20
NO
YES
256
YES
510
YES
10, 14
ISL3177E
FULL
20
NO
YES
256
NO
510
NO
8
ISL3178E
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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