Philips hef4534b DATASHEETS
INTEGRATED CIRCUITS
DATA SH EET
For a complete data sheet, please also download:
•The IC04 LOCMOS HE4000B Logic
Family Specifications HEF, HEC
•The IC04 LOCMOS HE4000B Logic
Package Outlines/Information HEF, HEC
HEF4534B
LSI
Real time 5-decade counter
Product specification
File under Integrated Circuits, IC04
January 1995
Philips Semiconductors Product specification
Real time 5-decade counter
DESCRIPTION
The HEF4534B is a 5-decade ripple counter. The binary
outputs of the decade counters are time-multiplexed by an
internal scanner on four BCD outputs (O0to O3). The
selected decade is indicated by a logic HIGH on the
appropriate digit select output (OS0: units, 1; OS1: tens,
10; OS2: hundreds, 102;OS3: thousands, 103; OS4: ten
thousands, 104).
The binary outputs (O0to O3) and the select outputs
(OS0to OS4) are 3-state controlled via enable inputs
EO and EOS respectively, allowing interface with other
bus orientated devices. Cascading may be accomplished
by using the carry out (TC). The counter is triggered by a
LOW to HIGH transition on the decade clock (CPA) and is
reset by a HIGH level on the master reset (MR). The
HEF4534B
LSI
scanner is triggered by a LOW to HIGH transition on the
scanner clock (CPS) and is reset (select ten thousand
counter) by a HIGH level on the scanner reset (MR
The counter can operate in four modes depending on the
state of the mode select inputs (SA,SB). The error detector
will detect an error when a positive edge on CPA is not
accompanied by a negative edge on the error detector
clock CPE or vice versa, within time limits adjusted by
external capacitors connected to C
ext 1
and C
ext 2.
more detected errors result in a HIGH level on the error
output (OER). The error detector is reset by a HIGH level
on MR.
Schmitt-trigger action in the clock inputs makes the circuit
highly tolerant to slower clock rise and fall times.
).
sc
Three or
Fig.1 Pinning diagram.
HEF4534BP(N): 24-lead DIL; plastic (SOT101-1)
HEF4534BD(F): 24-lead DIL; ceramic (cerdip) (SOT94)
HEF4534BT(D): 24-lead SO; plastic (SOT137-1)
( ): Package Designator North America
January 1995 2
PINNING
O
OS
1
to O
to OS
0
3
3
BCD outputs
digit select outputs
OER error output
CPA decade clock input
CPS scanner clock input
CPE error detector clock input
S
A,SB
mode select inputs
MR master reset input
MR
sc
scanner reset input
TC carry out
FAMILY DATA, I
LIMITS category LSI
DD
See Family Specifications
Philips Semiconductors Product specification
Real time 5-decade counter
HEF4534B
LSI
Fig.2 Functional block diagram.
January 1995 3
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