SP339E
RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION
REV. 1.0.0
PIN DESCRIPTIONS BY MODE (MODE1, MODE0)
Pin
Name
00, Figure 1
01, Figure 2
10, Figure 3
11, Figure 4
21
R9
R5 Input
22
23
24
R8
GND
R7
R4 Input
Ground
Ground
Ground
T3 Output
R3 Input
25
26
27
R6
GND
R4
T2 Output
T1 Output
R1 Input B
R2 Input A
28
29
30
R3
GND
R2
R2 Input
R1 Input
R1 Input A, T1 Out A
R1 Input B, T1 Out B
T1 Out A
T1 Out B
31
32
33
R1
VCC
VCC
VSS
VSS - Charge pump negative supply, 0.1µF from ground
C2+ - Charge pump cap 2 negative lead
34
C2-
C1- - Charge pump cap 1 negative lead
35
36
37
38
39
C1-
GND
C1+
VCC
C2+
Ground
C1+ - Charge pump cap 1 positive lead, 0.1µF
VCC
C2+ - Charge pump cap 2 positive lead, 0.1µF
VDD - Charge pump positive supply, 0.1µF to ground
40
VDD
4
EXAR [ EXAR CORPORATION ]
