ISL4485E Datasheet, PDF (2/11 Pages) Intersil Corporation – ±15kV ESD Protected, 20Mbps, 5V, Low Power, RS-485/RS-422 Transceiver

ISL4485E
Truth Tables
TRANSMITTING
INPUTS
OUTPUTS
RE
DE
DI
B/Z
A/Y
RE
X
1
1
0
1
0
X
1
0
1
0
0
X
0
X
High-Z
High-Z
0
1
RECEIVING
INPUTS
DE
A-B
0
≥ +0.2V
0
≤ -0.2V
0
Inputs Open
X
X
OUTPUT
RO
1
0
1
High-Z
Pin Descriptions
PIN
FUNCTION
RO Receiver output: If A > B by at least 0.2V, RO is high; If A < B by 0.2V or more, RO is low; RO = High if A and B are unconnected (floating).
RE
Receiver output enable. RO is enabled when RE is low; RO is high impedance when RE is high.
DE
Driver output enable. The driver outputs, Y and Z, are enabled by bringing DE high. They are high impedance when DE is low.
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 HBM ESD Protected, noninverting receiver input and noninverting driver output. Pin is an input (A) if DE = 0; pin is an output
(Y) if DE = 1.
B/Z ±15kV HBM ESD Protected, inverting receiver input and inverting driver output. Pin is an input (B) if DE = 0; pin is an output (Z) if
DE = 1.
V_CC System power supply input (4.5V to 5.5V).
Typical Operating Circuit
+5V
1 RO
2 _RE
3 DE
8
V_CC
R
B/Z
A/Y
+
0.1µF
7
R_T
6
4 DI
D
GND
5
ISL4485E
+5V
+
0.1µF
R_T
7
6
8
V_CC
B/Z
A/Y
DI 4
D
DE ³
RE 2
R
GND
5
RO 1
2