dm74173n National Semiconductor Corporation, dm74173n Datasheet

dm74173n

Manufacturer Part Number

dm74173n

Description

Tri-state Quad Registers

Manufacturer

National Semiconductor Corporation

Datasheet

1.DM74173N.pdf (6 pages)

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C 1995 National Semiconductor Corporation

54173 DM54173 DM74173

TRI-STATE Quad D Registers

General Description

These four-bit registers contain D-type flip-flops with totem-

pole TRI-STATE outputs capable of driving highly capaci-

tive or low-impedance loads The high-impedance state and

increased high-logic-level drive provide these flip-flops with

the capability of driving the bus lines in a bus-organized sys-

tem without need for interface or pull-up components

Gated enable inputs are provided for controlling the entry of

data into the flip-flops When both data-enable inputs are

low data at the D inputs are loaded into their respective flip-

flops on the next positive transition of the buffered clock

input Gate output control inputs are also provided When

both are low the normal logic states of the four outputs are

available for driving the loads or bus lines The outputs are

disabled independently from the level of the clock by a high

logic level at either output control input The outputs then

present a high impedance and neither load nor drive the bus

line Detailed operation is given in the function table

Connection Diagram

TRI-STATE is a registered trademark of National Semiconductor Corporation

See NS Package Number J16A N16E or W16A

Order Number 54173DMQB 54173FMQB

DM54173J DM54173W or DM74173N

Dual-In-Line Package

TL F 6556

TL F 6556 – 1

To minimize the possibility that two outputs will attempt to

take a common bus to opposite logic levels the output con-

trol circuitry is designed so that the average output disable

times are shorter than the average output enable times

Features

Function Table

established

Clear

When either M or N (or both) is (are) high the output is disabled to the

high-impedance state however sequential operation of the flip-flops is

not affected

TRI-STATE outputs interface directly with system bus

Gated output control lines for enabling or disabling the

outputs

Fully independent clock elminates restrictions for oper-

ating in one of two modes

For application as bus buffer registers

Typical propagation delay 18 ns

Typical frequency 30 MHz

Typical power dissipation 250 mW

Alternate Military Aerospace device (54173) is avail-

able Contact a National Semiconductor Sales Office

Distributor for specifications

low level (steady state)

don’t care (any input including transitions)

high level (steady state)

Parallel load

Do nothing (hold)

low-to-high level transition

the level of Q before the indicated steady state input conditions were

Clock

Inputs

Data Enable

RRD-B30M105 Printed in U S A

Data

June 1989

Output

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dm74173n Summary of contents

Page 1

... Detailed operation is given in the function table Connection Diagram Dual-In-Line Package Order Number 54173DMQB 54173FMQB DM54173J DM54173W or DM74173N See NS Package Number J16A N16E or W16A TRI-STATE is a registered trademark of National Semiconductor Corporation C 1995 National Semiconductor Corporation TL F 6556 ...

Page 2

Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage Input Voltage Operating Free Air Temperature Range DM54 and 54 b DM74 Storage Temperature Range b ...

Page 3

Switching Characteristics Symbol Parameter f Maximum Clock Frequency MAX t Propagation Delay Time PLH Low to High Level Output t Propagation Delay Time PHL High to Low Level Output t Propagation Delay Time PHL High to Low Level Output t ...

Page 4

Logic Diagram 6556 – 2 ...

Page 5

... Physical Dimensions inches (millimeters) 16-Lead Ceramic Dual-In-Line Package (J) Order Number 54173DMQB or DM54173J 16-Lead Molded Dual-In-Line Package (N) NS Package Number J16A Order Number DM74173N NS Package Number N16E 5 ...

Page 6

Physical Dimensions inches (millimeters) (Continued) 16-Lead Ceramic Flat Package (W) Order Number 54173FMQB or DM54173W LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF ...

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