DATASHEET
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 Renesas ISL317xE (ISL3170E, ISL3171E, ISL3172E,
ISL3173E, ISL3174E, ISL3175E, ISL3176E, ISL3177E,
Features
• IEC61000-4-2 ESD protection on RS-485 I/O pins . ±15kV
ISL3178E) 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 using an RS-485 network, so the high allowed
node count minimizes the number of repeaters required.
- HBM Class 3 ESD level on all other pins . . . . . . .>7kV
• 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
Hot Plug circuitry ensures that the Tx and Rx outputs remain
in a high impedance state while the power supply stabilizes.
• Three state Rx and Tx outputs available
• 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
The ISL3170E, ISL3171E, ISL3173E, ISL3174E, ISL3176E,
and 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.
• 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 SLEW-RATE
HOT
PLUG?
# DEVICES
ON BUS
RX/TX
ENABLE?
QUIESCENT
(µA)
LOW POWER
SHUTDOWN? COUNT
PIN
DUPLEX
(Mbps)
0.25
0.25
0.25
0.5
LIMITED?
I
CC
510
ISL3170E
ISL3171E
ISL3172E
ISL3173E
ISL3174E
ISL3175E
ISL3176E
ISL3177E
ISL3178E
Full
Yes
Yes
No
256
256
256
256
256
256
256
256
256
Yes
No
Yes
No
10, 14
Full
Yes
510
510
510
510
510
510
510
510
8
Half
Full
Yes
Yes
Yes
No
Yes
Yes
No
Yes
Yes
No
8
Yes
10, 14
Full
0.5
Yes
8
Half
Full
0.5
Yes
Yes
Yes
No
Yes
Yes
No
Yes
Yes
No
8
20
No
10, 14
Full
20
No
8
8
Half
20
No
Yes
Yes
Yes
FN6307 Rev.6.05
Sep 29, 2023
Page 1 of 23
© 2006-2023 Renesas Electronics
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