ISL3158AE Datasheet, PDF (1/16 Pages) Intersil Corporation – ±16.5kV ESD (IEC61000-4-2) Protected, Large Output Swing, 5V, Full Fail-Safe, 1/8 Unit Load, RS-485/RS-422 Transceiver

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Data Sheet
April 3, 2009
ISL3158AE
FN6886.0
±16.5kV ESD (IEC61000-4-2) Protected,
Large Output Swing, 5V, Full Fail-Safe, 1/8
Unit Load, RS-485/RS-422 Transceiver
The ISL3158AE is a BiCMOS, IEC61000 ESD protected, 5V
powered, single transceiver that meets both the RS-485 and
RS-422 standards for balanced communication. Each driver
output and receiver input is protected against ±16.5kV ESD
strikes without latch-up.
The ISL3158AE transmitter delivers exceptional differential
output voltages (2.4V min), into the RS-485 required 54Ω
load, for better noise immunity or to allow up to eight 120Ω
terminations in “star” or other non-standard bus topologies.
This device has very low bus currents (+125µA/-75µA), so it
presents 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.
Receiver (Rx) inputs feature a “Full Fail-Safe” design, which
ensures a logic high Rx output if Rx inputs are floating,
shorted, or on a terminated but undriven bus. Rx outputs
feature high drive levels - typically 28mA @ V_OL = 1V (to ease
the design of optocoupled isolated interfaces).
Hot Plug circuitry ensures that the Tx and Rx outputs remain
in a high impedance state until the power supply has
stabilized, and the Tx outputs are fully short circuit protected.
The ISL3158AE is a half duplex version. It multiplexes the
Rx inputs and Tx outputs to allow transceivers with output
disable functions in an 8 Ld package.
Features
• High Driver V_OD . . . . . . . . . . . . . . 2.4V (Min) @ R_D = 54Ω
- Better Noise Immunity, or Drive Up to 8 Terminations
• IEC61000 ESD Protection on RS-485 I/O Pins . . ±16.5kV
- Class 3 ESD Level on all Other Pins . . . . . . >7kV HBM
• Full Fail-safe (Open, Short, Terminated and Undriven)
Receivers
• High Rx I_OL to Drive Opto-Couplers for Isolated
Applications
• Hot Plug Circuitry - Tx and Rx Outputs Remain
Three-State During Power-up/Power-down
• True 1/8 Unit Load Allows up to 256 Devices on the Bus
• Specified for Single 5V, 10% Tolerance, Supplies
• High Data Rates . . . . . . . . . . . . . . . . . . . . . up to 10Mbps
• Low Quiescent Supply Current . . . . . . . . . . . . . . . 600µA
Ultra Low Shutdown Supply Current . . . . . . . . . . . . 70nA
• -7V to +12V Common Mode Input Voltage Range
• Half Duplex Pinouts
• Pb-free (RoHS compliant)
• Three-State Rx and Tx Outputs
• Current Limiting for Driver Overload Protection
Applications
• Utility Meters and Automated Meter Reading Systems
• High Node Count Systems
• PROFIBUS® and Field Bus Networks, and Factory
Automation
• Security Camera Networks
• Building Lighting and Environmental Control Systems
• Industrial/Process Control Networks
TABLE 1. SUMMARY OF FEATURES
PART
NUMBER
HALF/FUL DATA RATE SLEW-RATE
# DEVICES
Rx/Tx
L DUPLEX (Mbps)
LIMITED? HOT PLUG ON BUS ENABLE?
ISL3158AEM
Half
10
No
Yes
256
Yes
ISL3158AEMW
Half
10
No
Yes
256
Yes
QUIESCENT
I_CC (µA)
600
LOW POWER
SHUTDOWN?
Yes
PIN
COUNT
8
600
Yes
N/A
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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