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HEF4534B Datasheet(PDF) 4 Page - NXP Semiconductors

Part # HEF4534B
Description  Real time 5-decade counter
Download  10 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

HEF4534B Datasheet(HTML) 4 Page - NXP Semiconductors

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January 1995
4
Philips Semiconductors
Product specification
Real time 5-decade counter
HEF4534B
LSI
MODE CONTROL FUNCTION TABLE
SELECT INPUTS
1ST DECADE
OUTPUT
CARRY TO 2ND STAGE CARRY TO 4TH STAGE
MODE
SA
SB
LL
normal count
at 9 to 0 transition
at 9 to 0 transition
5-decade
and display
of the 1st decade
of the 3rd decade
counter
L
H
inhibited
input clock
input clock
test purposes:
clock directly into
stages 1, 2 and 4
H
H
inhibited
at 4 to 5 transition
of the 1st decade
at 9 to 0 transition
of the 3rd decade
4-decade counter
with
÷ 10 and round-
off at front end
HL
display counts:
at 7 to 8 transition
of the 1st decade
at 9 to 0 transition
of the 3rd decade
4-decade counter;
1
2-pence capability
3, 4, 5, 6, 7 = 5
8, 9, 0, 1, 2 = 0
Fig.3 Error detection timing diagram.
The skew time is the time difference between the LOW to
HIGH transition of CPA and the HIGH to LOW transition of
CPE or vice versa (see Fig.4). The skew time is typically
proportional to the external capacitor (Cext) connected
from Cext1 and Cext2 (pins 1 and 22) to VSS. The error
detector will count an error when a positive edge on the
counter clock CPA is not succeeded by a negative edge on
the error detector clock CPE within a skew time
tSK1 (adjustable by Cext1 at pin 1). The same holds for a
negative edge at CPE succeeded by a positive on CPA
within a skew time tSK2 (adjustable by Cext2 at pin 22). If
error detection is not needed, CPE must be either HIGH or
LOW and no Cext is applied. For further information see
Fig.5.
Fig.4
Skew times
timing diagram;
tWCPA > tSK1;
tWCPE > tSK2.


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