MC74F256DD

更新时间： 2024-11-25 13:11:19

品牌	Logo	应用领域
摩托罗拉 - MOTOROLA		触发器锁存器逻辑集成电路光电二极管双倍数据速率
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MC74F256DD 数据手册

MC54/74F256

DUAL 4-BIT

ADDRESSABLE LATCH

TheMC54/74F256dualaddressablelatchhasfourdistinctmodesofopera-

tion 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 un-

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

erroneousdata 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 unef-

fected by the Address and Data inputs.

DUAL 4-BIT

ADDRESSABLE LATCH

FAST SCHOTTKY TTL

J SUFFIX

CERAMIC

CASE 620-09

• 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

N SUFFIX

PLASTIC

CASE 648-08

CONNECTION DIAGRAM

D SUFFIX

SOIC

CASE 751B-03

ORDERING INFORMATION

MC54FXXXJ

MC74FXXXN Plastic

MC74FXXXD SOIC

Ceramic

GND

FUNCTION TABLE

Inputs

Outputs

Operating Mode

LOGIC SYMBOL

Master Reset

Q=d

Demultiplex (Active

HIGH Decoder when

D = H)

Q=d

Store (Do Nothing)

0a 1a 2a 3a 0b 1b 2b 3b

Q=d

Addressable

Latch

Q=d

10 11 12

Q=d

H = HIGH Voltage Level Steady State

L = LOW Voltage Level Steady State

X = Immaterial

d = HIGH or LOW Data one setup time prior to the LOW-to-HIGH Enable transition.

q = Lower case letters indicate the state of the referenced output established during the last cycle

in which it was addressed or cleared.

FAST AND LS TTL DATA

4-123

12 3 4

中文翻译

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与MC74F256DD相关器件

型号	品牌	获取价格	描述	数据表
MC74F256DDR2	MOTOROLA	获取价格	F/FAST SERIES, LOW LEVEL TRIGGERED D LATCH, TRUE OUTPUT, PDSO16, PLASTIC, SOIC-16
MC74F256DR2	MOTOROLA	获取价格	F/FAST SERIES, LOW LEVEL TRIGGERED D LATCH, TRUE OUTPUT, PDSO16, PLASTIC, SOIC-16
MC74F256N	MOTOROLA	获取价格	DUAL 4-BIT ADDRESSABLE LATCH
MC74F256ND	MOTOROLA	获取价格	F/FAST SERIES, LOW LEVEL TRIGGERED D LATCH, TRUE OUTPUT, PDIP16, PLASTIC, DIP-16
MC74F257A	MOTOROLA	获取价格	QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS
MC74F257AD	MOTOROLA	获取价格	QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS
MC74F257ADD	MOTOROLA	获取价格	F/FAST SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDSO16, PLASTIC, SOIC-16
MC74F257ADDR2	MOTOROLA	获取价格	F/FAST SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDSO16, PLASTIC, SOIC-16
MC74F257ADR2	MOTOROLA	获取价格	Multiplexer, F/FAST Series, 4-Func, 2 Line Input, 1 Line Output, True Output, TTL, PDSO16,
MC74F257AJ	MOTOROLA	获取价格	QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS

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