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MC74AC256N

Dual 4-Bit Addressable Latch

Motorola => Freescale 

MC74AC256

MC74ACT256

Dual 4ĆBit Addressable Latch

The MC74AC256/74ACT256 dual addressable latch has four distinct modes

of operation which are selectable by controlling the Clear and Enable inputs

(see Function Table). In the addressable latch mode, data at the Data (D) inputs

is written into the addressed latches. The addressed latches will follow the Data

input with all unaddressed latches remaining in their previous states.

In the memory mode, all latches remain in their previous states and are

unaffected by the Data or Address inputs. To eliminate the possibility of entering

erroneous data in the latches, the enable should be held HIGH (inactive) while

the address lines are changing. In the dual 1-of-4 decoding or demultiplexing

mode (MR = E = LOW), addressed outputs will follow the level of the D inputs

with all other outputs LOW. In the clear mode, all outputs are LOW and unaffected

by the Address and Data inputs.

• Combines Dual Demultiplexer and 8-Bit Latch

• Serial-to-Parallel Capability

• Output from Each Storage Bit Available

• Random (Addressable) Data Entry

• Easily Expandable

• Common Clear Input

• Useful as Dual 1-of-4 Active HIGH Decoder

VCC MR E Db Q3b Q2b Q1b Q0b

16 15 14 13 12 11 10 9

DUAL 4-BIT

ADDRESSABLE

LATCH

N SUFFIX

CASE 648-08

PLASTIC

D SUFFIX

CASE 751B-05

PLASTIC

12345678

A0 A1 Da Q0a Q1a Q2a Q3a GND

LOGIC SYMBOL

Da

Db

A0

E

A1

MR

Q0a Q1a Q2a Q3a Q0b Q1b Q2b Q3b

FACT DATA

5-1

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