ISL3179E Datasheet, PDF (2/17 Pages) Intersil Corporation – High ESD Protected, +125°C, 40Mbps 3.3V, Full Fail-Safe, RS-485/RS-422 Transceivers

ISL3179E, ISL3180E
Pinouts
ISL3179E
(8 LD SOIC, MSOP)
TOP VIEW
RO 1
R
RE 2
DE 3
DI 4
D
8 V_CC
7 B/Z
6 A/Y
5 GND
ISL3179E
(10 LD DFN)
TOP VIEW
RO ₁
RE 2
DE 3
DI 4
NC 5
10 ^VCC
9 NC
8 B/Z
7 A/Y
6 GND
ISL3180E
(SOIC)
TOP VIEW
NC 1
RO 2
R
RE 3
DE 4
DI 5
D
GND 6
GND 7
14 V_CC
13 NC
12 A
11 B
10 Z
9Y
8 NC
Truth Table
TRANSMITTING
INPUTS
OUTPUTS
RE
DE
DI
B/Z
A/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
Truth Table
RECEIVING
INPUTS
RE
DE
A-B
0
0
≥ -0.05V
0
0
≤ -0.2V
0
0
Inputs Open/Shorted
1
1
X
1
0
X
NOTE: *Shutdown Mode
OUTPUT
RO
1
0
1
High-Z
High-Z*
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, or
connected to a terminated bus that is undriven.
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 required,
connect RE directly to GND.
DE Driver output enable. The driver outputs, Y and Z, are enabled by bringing DE high, and they are high impedance when DE is low. If
the Tx enable function isn’t required, connect DE to V_CC through a 1kΩ or greater 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.
2
FN6365.2
April 22, 2008