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National Semiconductor - 8-Stage TRI-STATE Bidirectional Parallel/Serial Input/Output Bus Register

Numéro de référence CD4034BC
Description 8-Stage TRI-STATE Bidirectional Parallel/Serial Input/Output Bus Register
Fabricant National Semiconductor 
Logo National Semiconductor 





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CD4034BC fiche technique
February 1988
CD4034BM CD4034BC 8-Stage TRI-STATE Bidirectional
Parallel Serial Input Output Bus Register
General Description
The CD4034BM CD4034BC is an 8-bit CMOS static shift
register with two parallel bidirectional data ports (A and B)
which when combined with serial shifting operations can
be used to (1) bidirectionally transfer parallel data between
two buses (2) convert serial data to parallel form and direct
them to either of two buses (3) store (recirculate) parallel
data or (4) accept parallel data from either of two buses
and convert them to serial form These operations are con-
trolled by five control inputs
A ENABLE (AE) ‘‘A’’ data port is enabled only when AE
is at logical ‘‘1’’ This allows the use of a common bus
for multiple packages
A-BUS-TO-B-BUS B-BUS-TO-A-BUS (A B) This input
controls the direction of data flow When at logical ‘’1’’
data flows from port A to B (A is input B is output)
When at logical ‘‘0’’ the data flow direction is reversed
ASYNCHRONOUS SYNCHRONOUS (A S) When A S
is at logical ‘‘0’’ data transfer occurs at positive tran-
sition of the CLOCK When A S is at logical ‘‘1’’ data
transfer is independent of the CLOCK for parallel opera-
tion In serial mode A S input is internally disabled such
that operation is always synchronous (Asynchronous
serial operation is not possible )
PARALLEL SERIAL (P S) A logical ‘‘1’’ P S input al-
lows data transfer into the registers via A or B port (syn-
chronous if A S e logical ‘‘0’’ asynchronous if A S e
logical ‘‘1’’) A logical ‘‘0’’ P S allows serial data to
transfer into the register synchronously with the positive
transition of the CLOCK independent of the A S input
CLOCK Single phase enabled only in synchronous
mode (Either P S e logical ‘‘1’’ and A S e logical ‘‘0’’
or P S e logical ‘‘0’’
All register stages are D-type master-slave flip-flops with
separate master and slave clock inputs generated internally
to allow synchronous or asynchronous data transfer from
master to slave
All inputs are protected against damage due to static dis-
charge by diode clamps to VDD and VSS
Features
Y Wide supply voltage range
3 0V to 18V
Y High noise immunity
Y Low power TTL
compatibility
0 45 VDD (typ )
Fan out of 2 driving 74L
or 1 driving 74LS
Y RCA CD4034B second source
Applications
Y Parallel Input Parallel Output
Parallel Input Serial Output
Serial Input Parallel Output
Serial Input Serial Output register
Y Shift right shift left register
Y Shift right shift left with parallel loading
Y Address register
Y Buffer register
Y Bus system register with enable parallel lines at bus
side
Y Double bus register system
Y Up-down Johnson or ring counter
Y Pseudo-random code generators
Y Sample and hold register (storage counting display)
Y Frequency and phase comparator
Connection Diagram
Dual-In-Line Package
Order Number CD4034B
Top View
TL F 5963 – 1
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL F 5963
RRD-B30M105 Printed in U S A

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