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N74F259D

Latch

Philips Electronics 

Philips Semiconductors

Latch

Product specification

74F259

FEATURES

• Combines demultiplexer and 8-bit latch

• Serial-to-parallel capability

• Output from each storage bit available

• Random (addressable) data entry

• Easily expandable

• Common reset input

• Useful as 1-of-8 active-High decoder

PIN CONFIGURATION

A0 1

A1 2

A2 3

Q0 4

Q1 5

Q2 6

Q3 7

GND 8

16 VCC

15 MR

14 E

13 D

12 Q7

11 Q6

10 Q5

9 Q4

DESCRIPTION

The 74F259 addressable latch has four distinct modes of operation

which are selectable by controlling the Master Reset (MR) and

Enable (E) inputs (see Function Table). In the addressable latch

mode, data at the Data 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 store

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 1-of-8

decoding or demultiplexing mode (MR=E=Low), addressed outputs

will follow the level of the Data input, with all other outputs Low. In

the Master Reset mode, all outputs are Low and unaffected by the

Address and Data inputs.

SF00823

TYPE

74F259

TYPICAL

PROPAGATION

DELAY

7.5ns

TYPICAL SUPPLY

CURRENT (TOTAL)

31mA

ORDERING INFORMATION

ORDER CODE

DESCRIPTION

16-pin plastic DIP

COMMERCIAL RANGE

VCC = 5V ±10%,

Tamb = 0°C to +70°C

N74F259N

16-pin plastic SO

N74F259D

PKG DWG #

SOT38-4

SOT109-1

INPUT AND OUTPUT LOADING AND FAN-OUT TABLE

PINS

DESCRIPTION

D

Data input

A0, A1, A2

Address inputs

E

Enable input (active Low)

MR

Master Reset inputs (active Low)

Q0 – Q7

Data outputs

NOTE:

One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6mA in the Low state.

74F (U.L.)

HIGH/LOW

1.0/1.0

1.0/1.0

1.0/1.0

1.0/1.0

50/33

LOAD VALUE

HIGH/LOW

20µA/0.6mA

20µA/0.6mA

20µA/0.6mA

20µA/0.6mA

1.0mA/20mA

1989 Apr 11

2

853–0362 06316

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