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UPD4724 Datasheet(PDF) 3 Page - NEC

Part # UPD4724
Description  RS-232 LINE DRIVER/RECEIVER AT 3.3 V/5 V
PDF  16 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD4724 Datasheet(HTML) 3 Page - NEC

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3
µPD4724
STBY EN
Remark
TRUTH TABLE
Driver
STBY
DIN
DOUT
Remark
L
×
Z
Standby mode (D/D converter OFF)
H
L
H
Space level output
H
H
L
Mark level output
Receiver
RIN
ROUT
R4 to R5
R1 to R3
R4 to R5
R1 to R3
LL
××
H
H
Standby mode1 (D/D converter OFF)
LH
L
×
H
H
Standby mode2 (D/D converter OFF, R4 and R5 operate)
LH
H
×
L
H
Standby mode2 (D/D converter OFF, R4 and R5 operate)
H
×
L
H
Mark level input
H
×
H
L
Space level input
3 V and 5 V SwitchingNote
VCHA
Operation mode
L
5 V mode (Double boost)
H
3 V mode (Triple boost)
H: High level, L: Low level, Z: High-impedance,
×: Don’t care
Note Be sure to switch the VCHA pin in standby mode (STBY = L).



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