upd4722 Renesas Electronics Corporation., upd4722 Datasheet - Page 3

• Manufacturer Part Number: upd4722
• Description: Rs-232 Line Driver/receiver At 3.3 V/5 V
• Manufacturer: Renesas Electronics Corporation.

Truth Table
Driver
Receiver
3 V
H: high-level, L: low-level, Z: high-impedance, : H or L
Note 5. When switching V
STBY
STBY
V
H
H
H
H
CHA
H
L
L
L
L
L
5 V switching
5 V mode (double step-up)
3 V mode (3 times step-up)
D
EN
H
H
H
L
L
IN
Operating mode
Note 5
R
3
D
H
to R
L
H
OUT
Z
L
CHA
4
R
H
L
, standby mode must be selected (STBY = L).
IN
R
Standby mode (DC/DC converter is stopped)
Space level output
Mark level output
1
to R
2
R
3
to R
H
H
L
R
4
H
L
OUT
R
1
to R
H
H
H
Remarks
2
Standby mode 1 (DC/DC converter is stopped)
Standby mode 2 (DC/DC converter is stopped, R
and R
Standby mode 2 (DC/DC converter is stopped, R
and R
Mark level input
Space level input
4
4
are operated)
are operated)
Remarks
PD4722
3
3
3