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ISL3170E Datasheet PDF : 21 Pages
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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
FN6307
Rev.6.00
Aug 31, 2017
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 using 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,
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.
Related Literature
• For a full list of related documents, visit our website
- ISL3170E, ISL3171E, ISL3172E, ISL3173E, ISL3174E,
ISL3175E, ISL3176E, ISL3177E, ISL3178E product pages
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
PART
NUMBER
ISL3170E
ISL3171E
ISL3172E
ISL3173E
ISL3174E
ISL3175E
ISL3176E
ISL3177E
ISL3178E
HALF/FULL
DUPLEX
Full
Full
Half
Full
Full
Half
Full
Full
Half
DATA RATE
(Mbps)
0.25
0.25
0.25
0.5
0.5
0.5
20
20
20
TABLE 1. SUMMARY OF FEATURES
SLEW-RATE HOT # DEVICES RX/TX
LIMITED? PLUG? ON BUS ENABLE?
Yes
Yes
256
Yes
Yes
No
256
No
Yes
Yes
256
Yes
Yes
Yes
256
Yes
Yes
No
256
No
Yes
Yes
256
Yes
No
Yes
256
Yes
No
No
256
No
No
Yes
256
Yes
QUIESCENT
ICC (µA)
510
510
510
510
510
510
510
510
510
LOW POWER
SHUTDOWN?
Yes
No
Yes
Yes
No
Yes
Yes
No
Yes
PIN
COUNT
10, 14
8
8
10, 14
8
8
10, 14
8
8
FN6307 Rev.6.00
Aug 31, 2017
Page 1 of 21
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