UPD4721 datasheet(2/16 Pages) NEC

部件名	UPD4721

功能描述	RS-232 LINE DRIVER/RECEIVER AT 3.3 V/5 V

PDF	16 Pages

Scroll/Zoom	100%

制造商	NEC [NEC]

网页	http://www.nec.com/

标志

2 / 16 page

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.

DIN1

DIN2

ROUT1

ROUT2

STBY

VCHA

DOUT1

DOUT2

RIN1

RIN2

VDD

C1+

VCC

C1–

C5+

C5–

C4+

GND

C4–

VSS

+10 V

–10 V

Note 4

300

Ω

300

Ω

5.5 k

Ω

5.5 k

Ω

+3.3 V

+5 V

UPD4721 数据表(PDF) 2 Page - NEC

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