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SNx4HCT273 Octal D-Type Flip-Flops With Clear

1 Features

• Operating voltage range of 4.5 V to 5.5 V

• Outputs can drive up to 10 LSTTL loads

• Low power consumption, 80 µA maximum ICC

• Typical tpd = 12 ns

• ±4 mA output drive at 5 V

• Low input current of 1 µA maximum

• Inputs are TTL-voltage compatible

• Contain eight D-type flip-flops

• Direct clear input

2 Applications

• Buffer or storage registers

• Shift registers

• Pattern generators

3 Description

These devices are positive-edge-triggered D-type flip-

flops with a common enable input. The ’HCT273

devices are similar to the ’HCT377 devices, but

feature a common clear enable (CLR) input instead

of a latched clock.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)

SN74HCT273DW SOIC (20) 12.80 mm × 7.50 mm

SN74HCT273DB SSOP (20) 7.20 mm × 5.30 mm

SN74HCT273N PDIP (20) 25.40 mm × 6.35 mm

SN74HCT273NS SO (20) 15.00 mm × 5.30 mm

SN74HCT273PW TSSOP (20) 6.50 mm × 4.40 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Logic Diagram, (postive logic)

Logic Diagram, Each Flip Flop (positive logic)

SN54HCT273, SN74HCT273

SCLS068F – NOVEMBER 1988 – REVISED FEBRUARY 2022

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

Table of Contents

1 Features............................................................................1

2 Applications..................................................................... 1

3 Description.......................................................................1

4 Revision History.............................................................. 2

5 Pin Configuration and Functions...................................3

6 Specifications.................................................................. 4

6.1 Absolute Maximum Ratings........................................ 4

6.2 Recommended Operating Conditions(1) .................... 4

6.3 Thermal Information....................................................4

6.4 Electrical Characteristics.............................................5

6.5 Timing Requirements.................................................. 5

6.6 Switching Characteristics............................................6

6.7 Switching Characteristics............................................6

6.8 Operating Characteristics........................................... 6

7 Parameter Measurement Information............................ 7

8 Detailed Description........................................................8

8.1 Overview.....................................................................8

8.2 Functional Block Diagram........................................... 8

8.3 Device Functional Modes............................................8

9 Power Supply Recommendations..................................9

10 Layout.............................................................................9

10.1 Layout Guidelines..................................................... 9

11 Device and Documentation Support..........................10

11.1 Receiving Notification of Documentation Updates.. 10

11.2 Support Resources................................................. 10

11.3 Trademarks............................................................. 10

11.4 Electrostatic Discharge Caution.............................. 10

11.5 Glossary.................................................................. 10

12 Mechanical, Packaging, and Orderable

Information.................................................................... 10

4 Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Revision E (August 2003) to Revision F (February 2022) Page

• Updated the numbering, formatting, tables, figures, and cross-references throughout the doucment to reflect

modern data sheet standards............................................................................................................................. 1

SN54HCT273, SN74HCT273

SCLS068F – NOVEMBER 1988 – REVISED FEBRUARY 2022 www.ti.com