1993
DATA SHEET
MOS INTEGRATED CIRCUIT
PD4722
Document No. S12199EJ3V0DS00 (3rd edition)
(Previous No. IC-3280)
Date Published January 1997 N
Printed in Japan
RS-232 LINE DRIVER/RECEIVER AT 3.3 V/5 V
The
PD4722 is a high-breakdown voltage silicon gate CMOS line driver/receiver based on the EIA/TIA-232-E
standard. The internal DC/DC converter can switch between multiple voltages, allowing it to operate with a single +3.3
V or +5 V power supply. It also provides standby function.
This IC incorporates 4 driver circuits and 4 receiver circuits. An RS-232 interface circuit can be easily configured
by connecting 5 capacitors externally.
FEATURES
Conforms to EIA/TIA-232-E (former name, RS-232C) standards
Selectable +3.3 V/+5 V single power supply (selected by V
CHA
pin)
By setting the standby pin to a low level (standby mode), circuit current can be reduced. At such times, the driver
output is in a high-impedance state.
Even in the standby mode, 2 receiver circuits can operate as inverters without hysteresis width.
The other 2 circuits are fixed at a high level.
ORDERING INFORMATION
Part number
Package
PD4722GS-GJG
30-pin plastic SSOP (300 mil)
2
PD4722
BLOCK DIAGRAM/PIN CONFIGURATION (TOP VIEW)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
D
IN1
D
IN2
D
IN3
D
IN4
R
OUT1
R
OUT2
R
OUT3
R
OUT4
STBY
V
CHA
EN
D
OUT1
D
OUT2
D
OUT3
D
OUT4
R
IN1
R
IN2
R
IN3
R
IN4
V
DD
C
1
+
V
CC
C
1
C
5
+
GND
C
5
C
4
+
GND
C
4
V
SS
+10 V
C
3
C
1
C
5
10 V
+
C
2
C
4
+
+
+
Note 4
300
300
300
300
5.5 k
5.5 k
5.5 k
5.5 k
+3.3 V
or
+5 V
+
Note
1. V
DD
and V
SS
are output pins stepped up internally. These pins should not be loaded directly.
2. Capacitors C
1
to C
5
with a breakdown voltage of 20 V or higher are recommended. And it is
recommended to insert the capacitor that is 0.1
F to 1
F between V
CC
and GND.
3. If V
CHA
is kept low level (in 5 V mode), capacitor C
5
is not necessary.
4. The pull-up resistors at driver input are active resistors.
3
PD4722
Truth Table
Driver
STBY
D
IN
D
OUT
Remarks
L
Z
Standby mode (DC/DC converter is stopped)
H
L
H
Space level output
H
H
L
Mark level output
Receiver
STBY
EN
R
IN
R
OUT
Remarks
R
3
to R
4
R
1
to R
2
R
3
to R
4
R
1
to R
2
L
L
H
H
Standby mode 1 (DC/DC converter is stopped)
L
H
L
H
H
Standby mode 2 (DC/DC converter is stopped, R
3
and R
4
are operated)
L
H
H
L
H
Standby mode 2 (DC/DC converter is stopped, R
3
and R
4
are operated)
H
L
H
Mark level input
H
H
L
Space level input
3 V
5 V switching
Note 5
V
CHA
Operating mode
L
5 V mode (double step-up)
H
3 V mode (3 times step-up)
H: high-level, L: low-level, Z: high-impedance,
: H or L
Note 5. When switching V
CHA
, standby mode must be selected (STBY = L).
4
PD4722
ABSOLUTE MAXIMUM RATINGS (T
A
= 25
C)
Parameter
Symbol
Ratings
Unit
Supply Voltage (V
CHA
= L)
V
CC
0.5 to +7.0
V
Supply Voltage (V
CHA
= H)
V
CC
0.5 to +4.5
V
Driver Input Voltage
D
IN
0.5 to V
CC
+0.5
V
Receiver Input Voltage
R
IN
30.0 to +30.0
V
Control Input Voltage (STBY, V
CHA
, EN)
V
IN
0.5 to V
CC
+0.5
V
Driver Output Voltage
D
OUT
25.0 to +25.0
Note 6
V
Receiver Output Voltage
R
OUT
0.5 to V
CC
+0.5
V
Input Current (D
IN
, STBY, V
CHA
, EN)
I
IN
20.0
mA
Operating Ambient Temperature
T
A
40 to +85
C
Storage Temperature
T
stg
55 to + 150
C
Total Power Dissipation
P
T
0.5
W
Note 6. Pulse width = 1 ms, duty = 10 % MAX.
RECOMMENDED OPERATING CONDITIONS
Parameter
Symbol
MIN.
TYP.
MAX.
Unit
Supply Voltage (V
CHA
= L, 5 V mode)
V
CC
4.5
5.0
5.5
V
Supply Voltage (V
CHA
= H, 3 V mode)
V
CC
3.0
3.3
3.6
V
High-Level Input Voltage (D
IN
)
V
IH
2.0
V
CC
V
Low-Level Input Voltage (D
IN
)
V
IL
0
0.8
V
High-Level Input Voltage (STBY, V
CHA
, EN)
V
IH
2.4
V
CC
V
Low-Level Input Voltage (STBY, V
CHA
, EN)
V
IL
0
0.6
V
Receiver Input Voltage
R
IN
30
+30
V
Operating Ambient Temperature
T
A
40
+85
C
Capacitance of External Capacitor
Note 7
0.47
4.7
F
Note 7. In low temperature (below 0 C), the capacitance of electrolytic capacitor becomes lower. Therefore,
set higher values when using in low temperature.
Concerning the wiring length between the capacitor and the IC, the shorter the better.
Capacitors with good frequency characteristics such as tantalum capacitors, laminated ceramic
capacitors, and aluminum electrolytic capacitors for switching power supply are recommended for the
external capacitors.
5
PD4722
ELECTRICAL SPECIFICATIONS (TOTAL)
(UNLESS OTHERWISE SPECIFIED, T
A
= 40 to +85
C, C
1
to C
5
= 1
F)
Parameter
Symbol
Conditions
MIN.
TYP.
MAX.
Unit
V
CC
= +3.3 V, No load, R
IN
pin OPEN,
STBY = H
V
CC
= +5.0 V, No load, R
IN
pin OPEN,
STBY = H
V
CC
= +3.3 V, R
L
= 3 k
(D
OUT
), D
IN
= GND,
R
IN
, R
OUT
pin OPEN, STBY = H
V
CC
= +5.0 V,R
L
= 3 k
(D
OUT
), D
IN
= GND,
R
IN
, R
OUT
pin OPEN, STBY = H
V
CC
= +3.3 V, No load, D
IN
and R
IN
pins are
OPEN, STBY = L, EN = L, T
A
= 25
C
V
CC
= +3.3 V, No load, D
IN
and R
IN
pins are
OPEN, STBY = L, EN = L
V
CC
= +5.0 V, No load, D
IN
and R
IN
pins are
OPEN, STBY = L, EN = L, T
A
= 25
C
V
CC
= +5.0 V, No load, D
IN
and R
IN
pins are
OPEN, STBY = L, EN = L
V
CC
= +3.3 V, No load, D
IN
and R
IN
pins are
OPEN, STBY = L, EN = H, T
A
= 25
C
V
CC
= +3.3 V, No load, D
IN
and R
IN
pins are
OPEN, STBY = L, EN = H
V
CC
= +5.0 V, No load, D
IN
and R
IN
pins are
OPEN, STBY = L, EN = H, T
A
= 25
C
V
CC
= +5.0 V, No load, D
IN
and R
IN
pins are
OPEN, STBY = L, EN = H
High-Level Input Voltage
V
IH
V
CC
= +3.0 to +5.5 V, STBY, V
CHA
, EN pin
2.4
V
Low-Level Input Voltage
V
IL
V
CC
= +3.0 to +5.5 V, STBY, V
CHA
, EN pin
0.6
V
High-Level Input Current
I
IH
V
CC
= +5.5 V, V
I
= 5.5 V, STBY, V
CHA
, EN pin
1
A
Low-Level Input Current
I
IL
V
CC
= +5.5 V, V
I
= 0 V, STBY, V
CHA
, EN pin
1
A
Driver input and receiver input
V
CC
= +3.3 V, for GND, f = 1 MHz
Driver input and receiver input
V
CC
= +5.0 V, for GND, f = 1 MHz
STBY -- V
CHA
Time
t
SCH
V
CC
= +3.0 to 5.5 V, STBY
V
CHA
,
Note 8
1
s
V
CHA
-- STBY Time
t
CHS
V
CC
= +3.0 to 5.5 V, V
CHA
STBY
,
Note 8
1
s
STBY -- V
CC
Time
t
SC
V
CC
= +3.0 to 5.5 V, STBY
V
CC
,
Note 8
1
s
V
CC
-- STBY Time
t
CS
V
CC
= +3.0 to 5.5 V, V
CC
STBY
,
Note 8
1
s
* The TYP. values are for reference at T
A
= 25
C.
10
pF
Circuit Current
I
CC1
12
mA
16
mA
47
mA
38
mA
Circuit Current
I
CC2
I
CC3
Circuit Current at Standby
(Standby Mode 1)
I
CC4
Circuit Current at Standby
(Standby Mode 2)
5
A
10
A
2
5
A
1
3
A
5
A
10
A
2
5
A
1
3
A
10
pF
Input Capacitance
C
IN
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