Product details

Technology family LS Supply voltage (min) (V) 4.5 Supply voltage (max) (V) 5.5 Operating temperature range (°C) -55 to 125 Rating Military
Technology family LS Supply voltage (min) (V) 4.5 Supply voltage (max) (V) 5.5 Operating temperature range (°C) -55 to 125 Rating Military
CDIP (J) 14 130.4652 mm² 19.56 x 6.67
  • For applications in:
    • Digital Computer Systems
    • Data-Handling Systems
    • Control Systems
  • TYPE
    TYPICAL
    MAXIMUM
    CLOCK
    FREQUENCY
    TYPICAL
    POWER
    DISSIPATION
    '91A
    18 MHz
    175 mW
    'LS91
    18 MHz
    60 mW
  • For applications in:
    • Digital Computer Systems
    • Data-Handling Systems
    • Control Systems
  • TYPE
    TYPICAL
    MAXIMUM
    CLOCK
    FREQUENCY
    TYPICAL
    POWER
    DISSIPATION
    '91A
    18 MHz
    175 mW
    'LS91
    18 MHz
    60 mW

These monolithic serial-in, serial-out, 8-bit shift registers utilize transistor-transistor logic (TTL) circuits and are composed of eight R-S master-slave flip-flops, input gating, and a clock driver. Single-rail data and input control are gated through inputs A and B and an interanl inverter to form the complementary inputs to the first bit of the shift register. Drive for the internal common clock line is provided by an inverting clock driver. This clock pulse inverter/driver causes these circuits to shift information one bit on the positive edge of an input clock pulse.

These monolithic serial-in, serial-out, 8-bit shift registers utilize transistor-transistor logic (TTL) circuits and are composed of eight R-S master-slave flip-flops, input gating, and a clock driver. Single-rail data and input control are gated through inputs A and B and an interanl inverter to form the complementary inputs to the first bit of the shift register. Drive for the internal common clock line is provided by an inverting clock driver. This clock pulse inverter/driver causes these circuits to shift information one bit on the positive edge of an input clock pulse.

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Technical documentation

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Type Title Date
* Data sheet 8-Bit Shift Registers datasheet 01 Mar 1988
Application note Power-Up Behavior of Clocked Devices (Rev. B) PDF | HTML 15 Dec 2022
Selection guide Logic Guide (Rev. AB) 12 Jun 2017
Application note Understanding and Interpreting Standard-Logic Data Sheets (Rev. C) 02 Dec 2015
User guide LOGIC Pocket Data Book (Rev. B) 16 Jan 2007
Application note Semiconductor Packing Material Electrostatic Discharge (ESD) Protection 08 Jul 2004
Application note TI IBIS File Creation, Validation, and Distribution Processes 29 Aug 2002
Application note Designing With Logic (Rev. C) 01 Jun 1997
Application note Designing with the SN54/74LS123 (Rev. A) 01 Mar 1997
Application note Input and Output Characteristics of Digital Integrated Circuits 01 Oct 1996
Application note Live Insertion 01 Oct 1996

Design & development

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