SP337EBEY-L Datasheet, PDF (3/18 Pages) Exar Corporation – 3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER

REV. 1.0.2
PIN DESCRIPTIONS
SP337E
3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
Pin Assignments
PIN # PIN NAME
TYPE
RS-232
DESCRIPTION
RS-485/RS-422
T3 Driver TTL input
T3 Driver TTL input
1
TI3
Input _{This pin has a 400k pull-up to Vcc in both RS-232 and RS-485 modes.}
The pull-up is disabled in the SP337EU shutdown mode.
X*
Only RS-485 mode
2
TXEN
Input _{This pin has a 400k pull-up to Vcc in both RS-232 and RS-485 modes.}
The pull-up is disabled in the SP337EU shutdown mode.
3
TX4
Output
X*
T3(Z) Inverting Output
4
TX3
Output
T3 Driver Output
T3(Y) Non-Inverting Output
5
Vcc
Power
Power Supply Voltage, between 3.3V and 5V
6
TX1
Output
T1 Driver Output
T1(Y) Non-Inverting Output
7
TX2
Output
T2 Driver Output
T1(Z) Inverting Output
8
GND
Power
Ground
9
C1+
Pump
Positive Terminal of Positive Flying Capacitor
10
V+
Pump
Vdd Storage Capacitor
11
C2+
Pump
Positive Terminal of Negative Flying Capacitor
12
C1-
Pump
Negative Terminal of Positive Flying Capacitor
13
C2-
Pump
Negative Terminal of Negative Flying Capacitor
14
V-
Pump
Vss Storage Capacitor
15
RI1
Input R1 Receiver Input, 5k pull-down
R1(B) Receiver Inverting Input
16
RI2
Input R2 Receiver Input, 5k pull-down R1(A) Receiver Non-Inverting Input
17
RI3
Input R3 Receiver Input, 5k pull-down R3(A) Receiver Non-Inverting Input
18
RI4
Input R4 Receiver Input, 5k pull-down
R3(B) Receiver Inverting Input
19
RX1
Output
R1 Receiver Output
20
RX2
Output
R2 Receiver Output
X*
21
RX3
Output
R3 Receiver Output
22
RX4
Output
R4 Receiver Output
X*
23
RX5
Output
R5 Receiver Output
X*
24
RI5
Input R5 Receiver Input, 5k pull-down
X*
25 RS232/RS485 Input
Mode select, either RS-232 (low) or RS-485/422 (high) mode
26
RXEN
Input Receiver enable for both RS-232 and RS-485/422 mode (Active low)
3