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UPD4721 Folha de dados(PDF) 2 Page - NEC

Nome de Peças UPD4721
Descrição Electrónicos  RS-232 LINE DRIVER/RECEIVER AT 3.3 V/5 V
PDF  16 Pages
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Fabricante Electrônico  NEC [NEC]
Página de início  http://www.nec.com/
Logo NEC - NEC

UPD4721 Folha de dados(HTML) 2 Page - NEC

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2
µPD4721
BLOCK DIAGRAM/PIN CONFIGURATION (Top View)
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.
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
DIN1
DIN2
ROUT1
ROUT2
STBY
VCHA
DOUT1
DOUT2
RIN1
RIN2
VDD
C1+
VCC
C1–
C5+
C5–
C4+
GND
C4–
VSS
+10 V
C3
C1
C5
–10 V
+
C2
C4
+
+
+
Note 4
300
Ω
300
Ω
5.5 k
Ω
5.5 k
Ω
+3.3 V
or
+5 V
+



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