XR3170E Datasheet, PDF (3/24 Pages) Exar Corporation – 3.3V High Speed RS-485/RS-422 TRANSCEIVERS WITH 1/8 UNIT LOAD

REV. 1.0.0
PIN DESCRIPTIONS
XR3170E-3178E
3.3V HIGH SPEED RS-485/RS-422 TRANSCEIVERS WITH 1/8^th UNIT LOAD
Pin Assignments
PIN NUMBER
HALF DUPLEX
XR3172E
XR3175E
XR3178E
FULL DUPLEX
XR3171E
XR3174E
XR3177E
XR3170E
XR3173E
XR3176E
1
2
2
2
-
3
3
-
4
4
3
5
5
4
6, 7
6
-
-
7
-
-
8
1
-
8
-
7
-
5
-
6
-
-
Pin type: I=Input, O=Output.
14
12
11
9
10
1, 8, 13
PIN NAME
TYPE
DESCRIPTION
RO
RE
DE
DI
GND
A
B
Vcc
A
B
Y
Z
NC
Receiver Output. When RE is low and if (A-
O B) ≥ -50mV, RO is High. If (A-B) ≤ -200mV,
RO is Low.
Receiver Output Enable. When RE is Low,
RO is enabled. When RE is High, RO is
I high impedance. RE should be High and
DE should be low to enter shutdown mode.
RE is a hot-swap input.
Driver Output Enable. When DE is High,
outputs are enabled. When DE is low, out-
I puts are high impedance. DE should be low
and RE should be High to enter shutdown
mode. DE is a hot-swap input.
Driver Input. With DE high, a low level on DI
forces Non-Inverting output low and invert-
I ing output high. Similarly, a high level on DI
forces Non-Inverting output High and Invert-
ing output Low.
Pwr Ground.
I/O
Non-Inverting Receiver Input and Non-
Inverting Driver Output.
I/O
Inverting Receiver Input and Inverting
Driver Output.
Pwr
+3.3V power supply input. Bypass with
0.1uF capacitor.
I Non-Inverting Receiver Input.
I Inverting Reciever Input.
O Non-Inverting Driver Output.
O Inverting Driver Output.
- No Connect, not internally connected.
3