Document
DATA SHEET
MOS INTEGRATED CIRCUIT
µPD4723
RS-232 LINE DRIVER/RECEIVER AT 3.3 V/5 V
The µPD4723 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 3 driver circuits and 3 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 VCHA 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 circuit is fixed at a high level.
Ordering Information
Part number Package 30-pin plastic SSOP (300 mil)
µPD4723GS-GJG
Document No. S12200EJ2V0DS00 (2nd edition) (Previous No. IC-3284) Date Published January 1997 N Printed in Japan
©
1993
Free Datasheet http://www.datasheet4u.com/
µPD4723
BLOCK DIAGRAM/PIN CONFIGURATION (Top View)
+10 V C3 + +
1
VDD
C4+ 30 + C4
2 +3.3 V or +5 V C1
C1+
GND 29 + C2 C4– 28
3
VCC
4
C1– C5+
VSS 27
–10 V
5 C5 + 6
26 STBY
GND C5– Note 4 300 Ω
25 VCHA
7
24 EN
DIN1
8 300 Ω
23 DOUT1
DIN2
9 300 Ω
22 DOUT2
DIN3 10
21 DOUT3
ROUT1 11 5.5 kΩ ROUT2 12 5.5 kΩ ROUT3 13 5.5 kΩ NC 14
20 RIN1
19 RIN2
18 RIN3
17 NC
NC 15
16 NC
Note 1. VDD and VSS are output pins stepped up internally. These pins should not be loaded directly. 2. Capacitors C1 to C5 with a breakdown voltage of 20 V or higher are recommended. And it is recommended to insert the capacitor that is 0.1 µF to 1 µF between VCC and GND. 3. If VCHA is kept low level (in 5 V mode), capacitor C5 is not necessary. 4. The pull-up resistors at driver input are active resistors.
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Free Datasheet http://www.datasheet4u.com/
µPD4723
Truth Table Driver
STBY L H H DIN × L H DOUT Z H L Remarks Standby mode (DC/DC converter is stopped) Space level output Mark level output
Receiver
RIN STBY L L EN L H R2 to R3 × L R1 × × × ROUT R2 to R3 H H R1 H H Remarks Standby mode 1 (DC/DC converter is stopped) Standby mode 2 (DC/DC converter is stopped, R2 and R3 are operated) Standby mode 2 (DC/DC converter is stopped, R2 and R3 are operated) Mark level input Space level input
L
H × ×
H
L
H
H H
L H
H L
3 V ↔ 5 V switchingNote 5
VCHA L H Operating mode 5 V mode (double step-up) 3 V mode (3 times step-up)
H: high-level, L: low-level, Z: high-impedance, ×: H or L Note 5. When switching VCHA, standby mode must be selected (STBY = L).
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Free Datasheet http://www.datasheet4u.com/
µPD4723
ABSOLUTE MAXIMUM RATINGS (TA = 25 °C)
Parameter Supply Voltage (VCHA = L) Supply Voltage (VCHA = H) Driver Input Voltage Receiver Input Voltage Control Input Voltage (STBY, VCHA, EN) Driver Output Voltage Receiver Output Voltage Input Current (DIN, STBY, VCHA, EN) Operating Ambient Temperature Storage Temperature Total Power Dissipation Symbol VCC VCC DIN RIN VIN DOUT ROUT IIN TA Tstg PT Ratings –0.5 to +7.0 –0.5 to +4.5 –0.5 to VCC +0.5 –30.0 to +30.0 –0.5 to VCC +0.5 –25.0 to +25.0Note 6 Unit V V V V V V V mA °C °C W
–0.5 to VCC +0.5 ± 20.0 –40 to +85 –55 to + 150 0.5
Note 6. Pulse width = 1 ms, duty = 10 % MAX. RECOMMENDED OPERATING CONDITIONS
Parameter Supply Voltage (VCHA = L, 5 V mode) Supply Voltage (VCHA = H, 3 V mode) High-Level Input Voltage (DIN) Low-Level Input Voltage (DIN) High Level Input Voltage (STBY, VCHA, EN) Low Level Input Voltage (STBY, VCHA, EN) Receiver Input Voltage Operating Ambient Temperature Capacitance of External Capacitor Symbol VCC VCC VIH VIL VIH VIL RIN TA
Note 7
MIN. 4.5 3.0 2.0 0 2.4 0 –30 –40 0.33
TYP. 5.0 3.3
MAX. 5.5 3.6 VCC 0.8 VCC 0.6 +30 +85 4.7
Unit V V V V V V V °C
µF
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.
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Free Datasheet http://www.datasheet4u.com/
µPD4723
ELECTRICAL SPECIFICATIONS (TOTAL) (UNLESS OTHERWISE SPECIFIED, TA = –40 to +85 °C, C1 to C5 = 1 µF)
Parameter Symbol Conditions VCC = +3.3 V, No load, RIN pin OPEN, STBY = H Circuit Current ICC1 VCC = +5.0 V, No load, RIN pin OPEN, STBY = H VCC = +3.3 V, RL = 3 kΩ (DOUT), DIN = GND, RIN, ROUT pin OPEN, STBY = H Circuit Current ICC2 VCC = +5.0 V,RL = 3 kΩ (DOUT), DIN = GND, RIN, ROUT pin OPEN, STBY = H VCC = +3.3 V, No load, DIN and RIN pins are OPEN, STBY = L, EN = L, TA = 25 °C VCC = +3.3 V, No l.