SP335E
8
RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION REV. 1.0.0
PIN DESCRIPTIONS
Pin Name RS-232 RS-485 Full Duplex RS-485 Half Duplex
1
2 GND Ground
3 T1OUT, B/Z Transmitter 1 Output Z Driver Neg Output B/Z Neg Input/Output
4 T2OUT, A/Y Transmitter 2 Output Y Driver Pos Output A/Y Pos Input/Output
5
6 R1OUT Receiver 1 Output X X
7 R2OUT, RO Receiver 2 Output Receiver TTL Output Receiver TTL Output
8
9
10 SHDN Low power shutdown mode when low
11 SLEW Data rate limited to 250kbps when low
12 FD_TX_TERM X
120 Y-Z termination
enabled when both TERM
and FD_TX_TERM are high
X
13 TERM X 120 A-B termination enabled when high
14 RS-485/RS-232 0 1 1
15 HALF/FULL X 0 1
16
17 GND Ground
18 R2IN, A Receiver 2 Input A Pos Receiver Input X
19 R1IN, B Receiver 1 Input B Neg Receiver Input X
20 RE X Receiver enabled when low
21 T2IN, DE Transmitter 2 Input Driver enabled when high
22 T1IN, DI Transmitter 1 Input Driver TTL Input
23
24
25 V- Charge pump negative supply, 0.1µF from ground
26 C2- Charge pump cap 2 negative lead
27 C2+ Charge pump cap 2 positive lead, 0.1µF
28 V+ Charge pump positive supply, 0.1µF to ground
29 C1+ Charge pump cap 1 positive lead, 0.1µF
30 VL
Logic Supply for TTL Inputs and Outputs, V
L
= +1.65V to +5.5V or tie to V
CC
31 VCC
Main Supply, V
CC
= +3.0V to +5.5V, bypass to ground with 1.0µF
32 C1- Charge pump cap 1 negative lead
