ISL3280E Datasheet, PDF (4/15 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

ISL3280E, ISL3281E, ISL3282E, ISL3283E, ISL3284E, ISL3285E
Truth Table
RE, RE
1, 0
1, 0
RECEIVING
INPUTS
A-B
≥ -0.05V
≤ -0.2V
OUTPUT
RO
1
0
1, 0
Inputs Open/Shorted
1
0, 1
X
High-Z*
NOTE: *Shutdown Mode, except for ISL3280E, ISL3284E
Pin Descriptions
PIN NAME
FUNCTION
RO Receiver output: If A - B ≥ -50mV, RO is high; If A - B ≤ -200mV, RO is low; RO = High if A and B are unconnected (floating) or shorted.
RE, RE
Receiver output enable. RO is enabled when RE/RE is high / low; RO is high impedance when RE/RE is low/high. If the Rx enable
function isn’t used, connect RE directly to GND, or connect RE through a 1kΩ, or greater, resistor to V_CC. RE/RE are internally pulled
low/high.
GND Ground connection. This is also the potential of the TDFN thermal pad.
A
±16.5kV IEC61000 ESD Protected RS-485, RS-422 level, noninverting receiver input.
B
±16.5kV IEC61000 ESD Protected RS-485, RS-422 level, inverting receiver input.
V_CC
V_L
NC
System power supply input (3.0V to 5.5V). On devices with a V_L pin, power-up V_CC first.
Logic-Level Supply which sets the V_IL / V_IH levels for the RE (ISL3282E only) and RE (ISL3285E only) pins, and sets the V_OH level
of the RO output (ISL3282E, ISL3284E, ISL3285E only). Power-up this supply after V_CC, and keep V_L ≤ V_CC.
No Connection.
Typical Operating Circuits
+3.3V TO 5V
1
V_CC
ISL3281E
A
3 RO _R
B
5 _RE
+
0.1µF
6
R_T
4
NETWORK WITH ENABLES
+3.3V
+
0.1µF
2
V_CC
6Y
4Z
ISL329xE
DI 1
D
DE 3
GND
2
GND
5
4
FN6543.2
October 18, 2007