ISL3150E Datasheet, PDF (1/22 Pages) Intersil Corporation – ±16.5kV ESD, Large Output Swing, 5V, Full Fail-Safe, 1/8 Unit Load, RS-485/RS-422 Transceivers

±16.5kV ESD, Large Output Swing, 5V, Full
Fail-Safe, 1/8 Unit Load, RS-485/RS-422
Transceivers
ISL3150E, ISL3152E, ISL3153E,
ISL3155E, ISL3156E, ISL3158E
The ISL315xE are IEC61000 ESD protected, 5V
powered transceivers that meet the RS-485 and RS-422
standards for balanced communication. Driver outputs
and receiver inputs are protected against ±16.5kV ESD
strikes without latch-up.
Transmitters in this family deliver 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” topologies.
These devices have very low bus currents so they
present a true “1/8 unit load” to the RS-485 bus. This
allows up to 256 transceivers on the network 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).
Half duplex (Rx inputs and Tx outputs multiplexed
together) and full duplex pinouts are available. See
Table 1 on page 2 for key features and configurations by
device number.
Features
• High Driver V_OD . . . . . . . 2.4V (Min) @ R_D = 54Ω
Better Noise Immunity, or Drive Up to 8 Terminations
• ±16.5kV IEC61000 ESD Protection on I/O Bus Pins
• High Transient Overvoltage Tolerance . . . . ±100V
• Full Fail-safe (Open, Short, Terminated) Receivers
• High Rx I_OL for Opto-Couplers in Isolated Designs
• Hot Plug Circuitry - Tx and Rx Outputs Remain
Three-State During Power-up/Power-down
• True 1/8 Unit Load for up to 256 Devices on the Bus
• High Data Rates . . . . . . . . . . . . . . up to 20Mbps
• Low Quiescent Supply Current . . . . . . . . . 600µA
Ultra Low Shutdown Supply Current . . . . . . 70nA
Applications*(see page 17)
• Utility Meters/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
Exceptional Tx Drives Up To 8
Terminations While Still
Delivering 1.5V V_OD
140
130
120
110
100
90
80
70 8 TERMS
60
50
40
30
20
6 TERMS
2 TERMS
1 TERM
10
0
0
1 1.5 2
3
4
5
DIFFERENTIAL OUTPUT VOLTAGE (V)
Large V_OD Delivers Superior
Signal At Cable End For
Enhanced Noise Immunity
3
ISL3158E
2
1
0
STANDARD
1.5V TX
-1
-2
20Mbps, 150’ UTP, DOUBLE 120Ω TERMS
-3
20ns/DIV
July 30, 2009
FN6363.2
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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