SP335E_17 Datasheet, PDF (8/23 Pages) Exar Corporation – TRANSCEIVER WITH INTERNAL TERMINATION

SP335E
RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION
PIN DESCRIPTIONS
REV. 1.0.2
Pin
Name
1
2
GND
3
T1OUT, B/Z
4
T2OUT, A/Y
5
6
R1OUT
7
R2OUT, RO
8
9
10
SHDN
11
SLEW
12
FD_TX_TERM
13
TERM
14
RS-485/RS-232
15
HALF/FULL
16
17
GND
18
R2IN, A
19
R1IN, B
20
RE
21
T2IN, DE
22
T1IN, DI
23
24
25
V-
26
C2-
27
C2+
28
V+
29
C1+
30
VL
31
VCC
32
C1-
RS-232
Transmitter 1 Output
Transmitter 2 Output
Receiver 1 Output
Receiver 2 Output
RS-485 Full Duplex
Ground
Z Driver Neg Output
Y Driver Pos Output
X
Receiver TTL Output
RS-485 Half Duplex
B/Z Neg Input/Output
A/Y Pos Input/Output
X
Receiver TTL Output
Low power shutdown mode when low
Data rate limited to 250kbps when low
120 Y-Z termination
X
enabled when both TERM
X
and FD_TX_TERM are high
X
120 A-B termination enabled when high
0
1
1
X
0
1
Receiver 2 Input
Receiver 1 Input
X
Transmitter 2 Input
Transmitter 1 Input
Ground
A Pos Receiver Input
X
B Neg Receiver Input
X
Receiver enabled when low
Driver enabled when high
Driver TTL Input
Charge pump negative supply, 0.1µF from ground
Charge pump cap 2 negative lead
Charge pump cap 2 positive lead, 0.1µF
Charge pump positive supply, 0.1µF to ground
Charge pump cap 1 positive lead, 0.1µF
Logic Supply for TTL Inputs and Outputs, V_L = +1.65V to +5.5V or tie to V_CC
Main Supply, V_CC = +3.0V to +5.5V, bypass to ground with 1.0µF
Charge pump cap 1 negative lead
8