HEF4755VPN 查看數據表（PDF） - Philips Electronics
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HEF4755VPN Datasheet PDF : 12 Pages
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Philips Semiconductors
Transceiver for serial data communication
Product specification
HEF4755V
LSI
Table 1 Input code for message length
ML0
H
L
H
L
ML1
H
H
L
L
MESSAGE LENGTH
6 data bytes
4 data bytes
2 data bytes
variable length
depends on
format byte
Table 2 Input code for input mode
RX
TX
AS
L
L
L
status register connected to the data bus for error recognition
H
L
L
receiving in synchronous mode
L
H
L
transmitting in synchronous mode
H
H
L
receiving messages (without redundancy bit); data parallel out;
calculating of redundancy byte; transmitting data with redundancy
byte in synchronous mode
L
L
H
only bit check in asynchronous mode; no data output on data bus
H
L
H
receiving in asynchronous mode
L
H
H
transmitting in asynchronous mode
H
H
H
receiving and transmitting of a regenerated message in the
asynchronous mode
Table 3 Permissible time tolerance in bit distortion
TT1
TT0 PERMITTED DISTORTION (dt/T)
L
L
6/32 ≈ 19%
L
H
8/32 = 25%
H
L
10/32 ≈ 31%
H
H
12/32 ≈ 37%
Notes
1. H = HIGH state (the most positive voltage)
2. L = LOW state (the least positive voltage)
January 1995
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