ISL3280E Datasheet, PDF (1/15 Pages) Intersil Corporation – ±16.5kV ESD Protected, +125°C, 3.0V to 5.5V, SOT-23/TDFN Packaged, 20Mbps Full Fail-safe, Low Power, RS-485/RS-422 Receivers

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Data Sheet
ISL3280E, ISL3281E, ISL3282E,
ISL3283E, ISL3284E, ISL3285E
October 18, 2007
FN6543.2
±16.5kV ESD Protected, +125°C, 3.0V to
5.5V, SOT-23/TDFN Packaged, 20Mbps,
Full Fail-safe, Low Power, RS-485/RS-422
Receivers
The Intersil ISL3280E, ISL3281E, ISL3282E, ISL3283E,
ISL3284E, ISL3285E are ±16.5kV IEC61000 ESD
Protected, 3.0V to 5.5V powered, single receivers that meet
both the RS-485 and RS-422 standards for balanced
communication. These receivers 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 receivers on the network
without violating the RS-485 specification’s 32 unit load
maximum and without using repeaters.
Receiver inputs feature a “Full Fail-Safe” design, which
ensures a logic high Rx output if Rx inputs are floating,
shorted, or terminated but undriven.
The ISL3280E and ISL3284E feature an always enabled Rx;
the ISL3281E and ISL3285E feature an active high Rx
enable pin, and the ISL3282E and ISL3283E include an
active low enable pin. All versions are offered in Industrial
and Extended Industrial (-40°C to +125°C) temperature
ranges.
A 26% smaller footprint is available with the ISL3282E and
ISL3285E TDFN package. These devices, plus the
ISL3284E, also feature a logic supply pin (V_L) that sets the
V_OH level of the RO output (and the switching points of the
RE / RE input) to be compatible with another supply voltage
in mixed voltage systems.
Features
• IEC61000 ESD Protection on RS-485 Inputs . . . ±16.5kV
- Class 3 ESD Level on all Other Pins . . . . . . >5kV HBM
• Pb-Free (RoHS Compliant)
• Wide Supply Range . . . . . . . . . . . . . . . . . . . 3.0V to 5.5V
• Specified for +125°C Operation
• Logic Supply Pin (V_L) Eases Operation in Mixed Supply
Systems (ISL3282E, ISL3284E, ISL3285E Only)
• Full Fail-safe (Open, Short, Terminated/Undriven)
• True 1/8 Unit Load Allows up to 256 Devices on the Bus
• High Data Rates . . . . . . . . . . . . . . . . . . . . . up to 20Mbps
• Low Quiescent Supply Current . . . . . . . . . . 500µA (Max)
- Very Low Shutdown Supply Current . . . . . . 20µA (Max)
• -7V to +12V Common Mode Input Voltage Range
• Tri-statable Rx Available (Active Low or High EN Input)
• 5V Tolerant Logic Inputs When V_CC ≤ 5V
Applications
• Clock Distribution
• High Node Count Systems
• Space Constrained Systems
• Security Camera Networks
• Building Environmental Control/Lighting Systems
For companion single RS-485 transmitters in micro
packages, please see the ISL3293E, ISL3294E, ISL3295E,
ISL3296E, ISL3297E, ISL3298E data sheet.
• Industrial/Process Control Networks
TABLE 1. SUMMARY OF FEATURES
PART
NUMBER
ISL3280E
DATA RATE # DEVICES
FUNCTION
(Mbps)
ON BUS
1 Rx
20
256
RX
ENABLE?
NO
V_L PIN?
NO
QUIESCENT
I_CC (µA)
350
LOW POWER
SHUTDOWN?
NO
LEAD
COUNT
5-SOT
ISL3281E
1 Rx
20
256
ACTIVE HIGH
NO
350
YES
6-SOT
ISL3282E
1 Rx
20
256
ACTIVE LOW
YES
350
YES
8-TDFN
ISL3283E
1 Rx
20
256
ACTIVE LOW
NO
350
YES
6-SOT
ISL3284E
1 Rx
20
256
NO
YES
350
NO
6-SOT
ISL3285E
1 Rx
20
256
ACTIVE HIGH
YES
350
YES
8-TDFN
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright Intersil Americas Inc. 2007. All Rights Reserved
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