CD4724BC 查看數據表（PDF） - Fairchild Semiconductor
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CD4724BC Datasheet PDF : 7 Pages
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October 1987
Revised January 1999
CD4724BC
8-Bit Addressable Latch
General Description
The CD4724BC is an 8-bit addressable latch with three
address inputs (A0–A2), an active low enable input (E),
active high clear input (CL), a data input (D) and eight out-
puts (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 active output which follows the data input while all
unaddressed bits are held LOW. When operating in the
addressable latch mode (E = CL = 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 = HIGH, CL = LOW).
Features
s Wide supply voltage range: 3.0V to 15V
s High noise immunity: 0.45 VDD (typ.)
s Low power TTL compatibility:
fan out of 2 driving 74L or 1 driving 74LS
s Serial to parallel capability
s Storage register capability
s Random (addressable) data entry
s Active high demultiplexing capability
s Common active high clear
Ordering Code:
Order Number Package Number
Package Description
CD4724BCM
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow Body
CD4724BCN
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Truth Table
Pin Assignments for DIP and SOIC
Mode Selection
E CL Addressed Unaddressed
Mode
Latch
Latch
L L Follows Data Holds Previous Addressable
Data
Latch
H L Hold Previous Holds Previous Memory
Data
Data
L H Follows Data Reset to “0”
Demultiplexer
H H Reset to “0” Reset to “0”
Clear
Top View
© 1999 Fairchild Semiconductor Corporation DS006003.prf
www.fairchildsemi.com
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