ISL3170E Datasheet, PDF (3/19 Pages) Intersil Corporation – ±15kV ESD Protected, 3.3V, Full Fail-safe, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers

ISL3170E, ISL3171E, ISL3172E, ISL3173E, ISL3174E, ISL3175E, ISL3176E, ISL3177E, ISL3178E
Truth Tables
TRANSMITTING
INPUTS
OUTPUTS
RE
DE
DI
Z
Y
X
1
1
0
1
X
1
0
1
0
0
0
X
High-Z
High-Z
1
0
X
High-Z * High-Z *
NOTE: *Shutdown Mode (See Note 9), except for ISL3171E,
ISL3174E, ISL3177E
RECEIVING
INPUTS
OUTPUT
RE
DE
DE
A-B
RO
Half Duplex Full Duplex
0
0
X
≥ -0.05V
1
0
0
X
≤ -0.2V
0
0
0
X
Inputs
1
Open/Shorted
1
0
0
X
High-Z *
1
1
1
X
High-Z
NOTE: *Shutdown Mode (See Note 9), except for ISL3171E,
ISL3174E, ISL3177E
Pin Descriptions
PIN
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
Receiver output enable. RO is enabled when RE is low; RO is high impedance when RE is high. If the Rx enable function isn’t used,
connect RE directly to GND or through a 1kΩ to 3kΩ resistor to GND.
DE
Driver output enable. The driver outputs, Y and Z, are enabled by bringing DE high, and are high impedance when DE is low. If the
Tx enable function isn’t used, connect DE to V_CC through a 1kΩ to 3kΩ resistor.
DI
Driver input. A low on DI forces output Y low and output Z high. Similarly, a high on DI forces output Y high and output Z low.
GND Ground connection.
A/Y ±15kV IEC61000 ESD Protected RS-485/422 level, noninverting receiver input and noninverting driver output. Pin is an input if
DE = 0; pin is an output if DE = 1.
B/Z ±15kV IEC61000 ESD Protected RS-485/422 level, Inverting receiver input and inverting driver output. Pin is an input if DE = 0;
pin is an output if DE = 1.
A
±15kV IEC61000 ESD Protected RS-485/422 level, noninverting receiver input.
B
±15kV IEC61000 ESD Protected RS-485/422 level, inverting receiver input.
Y
±15kV IEC61000 ESD Protected RS-485/422 level, noninverting driver output.
Z
±15kV IEC61000 ESD Protected RS-485/422 level, inverting driver output.
V_CC System power supply input (3.0V to 3.6V).
NC No Connection.
3
FN6307.2
August 28, 2006