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CD4724BCN Arkusz danych(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Numer części CD4724BCN
Szczegółowy opis  Dual 4-Bit, 8-Bit Addressable Latch
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Producent  NSC [National Semiconductor (TI)]
Strona internetowa  http://www.national.com
Logo NSC - National Semiconductor (TI)

CD4724BCN Arkusz danych(HTML) 1 Page - National Semiconductor (TI)

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TLF6003
February 1988
CD4723BMCD4723BC Dual 4-Bit Addressable Latch
CD4724BMCD4724BC 8-Bit Addressable Latch
General Description
The CD4723B is a dual 4-bit addressable latch with com-
mon control inputs including two address inputs (A0 A1)
an active low enable input (E) and an active high clear input
(CL) Each latch has a data input (D) and four outputs (Q0 –
Q3) The CD4724B is an 8-bit addressable latch with three
address inputs (A0 – A2) an active low enable input (E) ac-
tive high clear input (CL) a data input (D) and eight outputs
(Q0 – Q7)
Data is entered into a particular bit in the latch when that is
addressed by the address inputs and the enable (E) is low
Data entry is inhibited when enable (E) is high
When clear (CL) and enable (E) are high all outputs are low
When clear (CL) is high and enable (E) is low the channel
demultiplexing occurs The bit that is addressed has an ac-
tive output which follows the data input while all unad-
dressed bits are held low When operating in the address-
able latch mode (E e CL e low) changing more than one
bit of the address could impose a transient wrong address
Therefore this should only be done while in the memory
mode (E e high CL e low)
Features
Y
Wide supply voltage range
30V to 15V
Y
High noise immunity
045 VDD (typ)
Y
Low power TTL
fan out of 2 driving 74L
compatibility
or 1 driving 74LS
Y
Serial to parallel capability
Y
Storage register capability
Y
Random (addressable) data entry
Y
Active high demultiplexing capability
Y
Common active high clear
Connection Diagrams
CD4723B
Dual-In-Line Package
TLF6003 – 1
Top View
CD4724B
Dual-In-Line Package
TLF6003 – 2
Top View
Order Number CD4723B or
CD4724B
Truth Table
Mode Selection
E
CL
Addressed
Unaddressed
Mode
Latch
Latch
L
L
Follows Data
Holds Previous Data
Addressable Latch
H
L
Hold Previous Data
Holds Previous Data
Memory
L
H
Follows Data
Reset to ‘‘0’’
Demultiplexer
H
H
Reset to ‘0’’
Reset to ‘‘0’’
Clear
C1995 National Semiconductor Corporation
RRD-B30M105Printed in U S A


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