mm74hc259 Fairchild Semiconductor, mm74hc259 Datasheet

mm74hc259

Manufacturer Part Number

mm74hc259

Description

8-bit Addressable Latch/3-to-8 Line Decoder

Manufacturer

Fairchild Semiconductor

Datasheet

1.MM74HC259.pdf (7 pages)

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MM74HC259M

MM74HC259SJ

MM74HC259MTC

MM74HC259N

MM74HC259

8-Bit Addressable Latch/3-to-8 Line Decoder

General Description

The MM74HC259 device utilizes advanced silicon-gate

CMOS technology to implement an 8-bit addressable latch,

designed for general purpose storage applications in digital

systems.

The MM74HC259 has a single data input (D), 8 latch out-

puts (Q1–Q8), 3 address inputs (A, B, and C), a common

enable input (G), and a common CLEAR input. To operate

this device as an addressable latch, data is held on the D

input, and the address of the latch into which the data is to

be entered is held on the A, B, and C inputs. When

ENABLE is taken LOW the data flows through to the

addressed output. The data is stored when ENABLE transi-

tions from LOW-to-HIGH. All unaddressed latches will

remain unaffected. With enable in the HIGH state the

device is deselected, and all latches remain in their previ-

ous state, unaffected by changes on the data or address

Ordering Code:

Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Connection Diagram

Pin Assignments for DIP, SOIC, SOP and TSSOP

Package Number Package Description

MTC16

Top View

M16D

M16A

N16E

16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150” Narrow

16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide

DS005006.prf

inputs. To eliminate the possibility of entering erroneous

data into the latches, the enable should be held HIGH

(inactive) while the address lines are changing.

If enable is held HIGH and CLEAR is taken LOW all eight

latches are cleared to a LOW state. If enable is LOW all

latches except the addressed latch will be cleared. The

addressed latch will instead follow the D input, effectively

implementing a 3-to-8 line decoder.

All inputs are protected from damage due to static dis-

charge by diodes to V

Features

Latch Selection Table

before the indicated steady-state input

conditions were established.

Typical propagation delay: 18 ns

Wide supply range: 2–6V

Low input current: 1 A maximum

Low quiescent current: 80 A maximum (74HC Series)

the level of Q

HIGH level, L

the level at the data input

Select Inputs

LOW level

0, 1 .. .7, as appropriate)

and ground.

September 1983

Revised February 1999

Addressed

www.fairchildsemi.com

Latch

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mm74hc259 Summary of contents

Page 1

... CMOS technology to implement an 8-bit addressable latch, designed for general purpose storage applications in digital systems. The MM74HC259 has a single data input (D), 8 latch out- puts (Q1–Q8), 3 address inputs (A, B, and C), a common enable input (G), and a common CLEAR input. To operate this device as an addressable latch, data is held on the D input, and the address of the latch into which the data entered is held on the A, B, and C inputs ...

Page 2

Truth Table Inputs Clear Logic Diagram www.fairchildsemi.com Outputs of Each Addressed Other Function Latch Output D Q Addressable Latch Memory 8-Line Decoder L L ...

Page 3

Absolute Maximum Ratings (Note 2) Supply Voltage ( Input Voltage ( Output Voltage (V ) OUT Clamp Diode Current ( Output Current, per pin (I ) OUT DC ...

Page 4

AC Electrical Characteristics (V 5.0V ns unless otherwise specified Symbol Parameter Maximum Propagation Delay PHL PLH Data to Output Maximum ...

Page 5

Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M16A Package Number M16D 5 www.fairchildsemi.com ...

Page 6

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide www.fairchildsemi.com Package Number MTC16 6 ...

Page 7

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN ...

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