NEC UPD4726GS-BAF Datasheet
DATA SHEET
MOS INTEGRATED CIRCUIT
µ
PD4726
RS-232 LINE DRIVER/RECEIVER
The µPD4726 is a high-voltage silicon gate CMOS line driver/receiver conforming to EIA/TIA-232-E Standards.
It contains a DC/DC converter and can operate with a +5 V single power supply. In addition, it is also provided with
ancillary functions such as a standby function.
This IC is equipped with four driver circuits and seven receiver circuits and can configure a simple RS-232 interface
circuit with only four external capacitors.
FEATURES
Conforms to EIA/TIA-32-E (old RS-232C) Standards
•
+5 V single power supply
•
A standby mode can be set by making the standby pin low to reduce the power dissipation. At this time, the driver
•
outputs go into a high-impedance state.
Two receiver circuits can operate as inverters without a hysteresis width even in the standby mode. The remaining
•
five receiver circuits are fixed to the high level.
ORDERING INFORMATION
Part Number Package Quality Grade
µ
PD4726GS-BAF 36-pin plastic SSOP (300 mil) Standard
Please refer to "Quality grade on NEC Semiconductor Devices" (Document number IEI-1209) published by NEC
Corporation to know the specification of quality grade on the devices and its recommended applications.
Document No. IC-3413 (1st edition)
(O.D.No. IC-8923)
Date Published March 1997 P
Printed in Japan
©
1994
BLOCK DIAGRAM/PIN CONFIGURATION (Top View)
µ
PD4726
+5 V
+10 V
1
V
10
11
12
DD
+
2
C
1
3
V
CC
-
4
C
1
5
N.C.
6
GND
N.C.
7
To internal
circuit
To internal
circuit
8
9
+
C
3
+
C
1
D
IN1
D
IN2
D
IN3
D
IN4
R
OUT1
C
GND
C
V
+
36
4
35
-
34
4
33
SS
32
31
30
29
28
27
26
25
STBY
GND
EN
D
OUT1
D
OUT2
D
OUT3
D
OUT4
R
IN1
+
C
4
+
C
2
−10 V
24
R
23
22
21
20
19
IN2
R
IN3
R
IN4
R
IN5
R
IN6
R
IN7
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
13
14
15
16
17
18
R
R
R
R
R
R
Notes1. VDD and VSS output internally boosted voltages. Do not connect a load directly to these pins.
2. It is recommended that capacitors having a breakdown voltage of 20 V or higher be used as C
5. Inserting a bypass capacitor of 0.1 to 1
C
µ
F in between VCC and GND is also recommended.
3. Be sure to connect all the GND pins. Especially, make sure that pin 31 is connected; otherwise, the
µ
PD4726 will not operate normally. Be sure to leave the NC pins (pins 5 and 7) open.
4. The pull-up resistors for D
IN1 through DIN4 and STBY and the pull-down resistor for EN are active resistors.
1 through
2
TRUTH TABLE
Drivers
STBY DIN DOUT Remarks
L × Z Standby mode (DC/DC converter stops.)
H L H Space level output
H H L Mark level output
Receivers
µ
PD4726
STBY EN
LL××H H Standby mode 1 (DC/DC converter stops.)
LHL×H H Standby mode 2 (DC/DC converter stops. R6 and R7 operate.)
LHH×LH
H× L H Mark level input
H × H L Space level input
H: high level
L : low level
Z : high impedance
× : H or L
RIN ROUT
R6 - R7 R1 - R5 R6 - R7 R1 - R5
Remarks
3
ABSOLUTE MAXIMUM RATING (Ta = 25 °C)
Parameter Symbol Ratings Unit
Supply voltage VCC −0.5 to +7.0 V
Driver input voltage DIN −0.5 to V CC + 0.5 V
Receiver input voltage RIN −30.0 to +30.0 V
Control input voltage VIN −0.5 to VCC + 0.5 V
(STBY, EN)
Driver output voltage DOUT −25.0 to +25.0
Receiver output voltage ROUT −0.5 to VCC + 0.5 V
Input current (DIN, STBY, EN) IINI ±20.0 mA
Operating ambient temperature Topt. −40 to +85 °C
Storage temperature Tstg. −55 to +150 °C
Permissible package power PT 0.5 W
dissipation
Note 5. Pulse width: 1 ms, duty cycle: 10 % MAX.
Note 5
µ
PD4726
V
RECOMMENDED OPERATING CONDITIONS
Parameter Symbol MIN. TYP. MAX. Unit
Supply voltage (VCHA = L) VCC 4.5 5.0 5.5 V
Input voltage, high (DIN)VIH 2.0 V CC V
Input voltage, low (DIN)VIL 0 0.8 V
Input voltage, high (STBY, EN) VIH 2.4 VCC V
Input voltage, low (STBY, EN) VIL 0 0.8 V
Receiver input voltage RIN −30 +30 V
Operating ambient temperature Topt. −40 +85 °C
External capacitance (nominal value) Note 6 1 4.7
Note 6. Use capacitors whose capacitance fluctuation is within ±50 % including fluctuations due to temperature
µ
and tolerance (effective value: 0.5 to 7.05
F).
Use of capacitors with excellent high-frequency characteristics (such as multilayer ceramic capacitors,
tantalum capacitors, and aluminum electrolytic capacitors for switching power supply) is recommended.
Keep the wiring length between a capacitor and an IC pin as short as possible.
µ
F
4
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