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UPD4721 数据表(PDF) 3 Page - 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 Zoom In 100%  Zoom Out
制造商  NEC [NEC]
网页  http://www.nec.com/
标志 NEC - NEC

UPD4721 数据表(HTML) 3 Page - NEC

  UPD4721 Datasheet HTML 1Page - NEC UPD4721 Datasheet HTML 2Page - NEC UPD4721 Datasheet HTML 3Page - NEC UPD4721 Datasheet HTML 4Page - NEC UPD4721 Datasheet HTML 5Page - NEC UPD4721 Datasheet HTML 6Page - NEC UPD4721 Datasheet HTML 7Page - NEC UPD4721 Datasheet HTML 8Page - NEC UPD4721 Datasheet HTML 9Page - NEC Next Button
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 3 / 16 page
background image
3
µPD4721
Truth Table
Driver
STBY
DIN
DOUT
Remarks
L
×
Z
Standby mode (DC/DC converter is stopped)
H
L
H
Space level output
H
H
L
Mark level output
Receiver
STBY
RIN
ROUT
Remarks
L
×
H
Standby mode (DC/DC converter is stopped)
H
L
H
Mark level input
H
H
L
Space level input
3 V
↔ 5 V switching Note 5
VCHA
Operating mode
L
5 V mode (double step-up)
H
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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