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SN74LS191NSR - Texas Instruments

Description: Synchronous 4-Bit Up/Down Counters With Up/Down Mode Control

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SN74LS191NSR - Texas Instruments PCB footprint - Small Outline Packages - Small Outline Packages - NS (R-PDSO-G**)
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SN74LS191NSR - Texas Instruments  - 3D model - Small Outline Packages - NS (R-PDSO-G**)
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SN74LS191NSR Details

  • Manufacturer Part Number:

    SN74LS191NSR

  • Brand Name:

    Texas Instruments

  • Pbfree Code:

    Yes

  • Rohs Code:

    Yes

  • Part Life Cycle Code:

    Active

  • Part Package Code:

    SOIC

  • Pin Count:

    16

  • Country Of Origin:

    Malaysia

  • ECCN Code:

    EAR99

  • HTS Code:

    8542.39.00.90

  • Manufacturer:

    Texas Instruments

  • YTEOL:

    15

  • Additional Feature:

    TCO OUTPUT

  • Count Direction:

    BIDIRECTIONAL

  • Family:

    LS

  • JESD-30 Code:

    R-PDSO-G16

  • JESD-609 Code:

    e4

  • Length:

    10.2 mm

  • Load Capacitance (CL):

    15 pF

  • Load/Preset Input:

    YES

  • Logic IC Type:

    BINARY COUNTER

  • Max Frequency@Nom-Sup:

    20000000 Hz

  • Max I(ol):

    0.016 A

  • Mode of Operation:

    SYNCHRONOUS

  • Moisture Sensitivity Level:

    1

  • Number of Bits:

    4

  • Number of Functions:

    1

  • Number of Terminals:

    16

  • Operating Temperature-Max:

    70 °C

  • Package Body Material:

    PLASTIC/EPOXY

  • Package Code:

    SOP

  • Package Equivalence Code:

    SOP16,.3

  • Package Shape:

    RECTANGULAR

  • Package Style:

    SMALL OUTLINE

  • Packing Method:

    TR

  • Peak Reflow Temperature (Cel):

    260

  • Power Supply Current-Max (ICC):

    105 mA

  • Prop. Delay@Nom-Sup:

    52 ns

  • Propagation Delay (tpd):

    36 ns

  • Qualification Status:

    Not Qualified

  • Seated Height-Max:

    2 mm

  • Supply Voltage-Max (Vsup):

    5.25 V

  • Supply Voltage-Min (Vsup):

    4.75 V

  • Supply Voltage-Nom (Vsup):

    5 V

  • Surface Mount:

    YES

  • Technology:

    TTL

  • Temperature Grade:

    COMMERCIAL

  • Terminal Finish:

    Nickel/Palladium/Gold (Ni/Pd/Au)

  • Terminal Form:

    GULL WING

  • Terminal Pitch:

    1.27 mm

  • Terminal Position:

    DUAL

  • Time@Peak Reflow Temperature-Max (s):

    30

  • Trigger Type:

    POSITIVE EDGE

  • Width:

    5.3 mm

  • fmax-Min:

    20 MHz

SN74LS191NSR Frequently Asked Questions (FAQs)

  • The maximum clock frequency of the SN74LS191NSR is 25 MHz, but it can vary depending on the operating voltage and load capacitance. It's recommended to check the timing characteristics in the datasheet for specific frequency limits.
  • To ensure proper reset during power-up, connect the CLR (clear) input to a pull-up resistor and a capacitor to ground. This will ensure that the counter is reset to zero when the power is applied.
  • The SN74LS191NSR can be used as both a binary counter and a BCD (Binary-Coded Decimal) counter. The counter mode is selected by the MODE input. When MODE is high, the counter operates in binary mode, and when MODE is low, it operates in BCD mode.
  • The maximum input voltage that the SN74LS191NSR can tolerate is 7V. Exceeding this voltage can cause damage to the device. It's recommended to keep the input voltage within the recommended operating range of 4.75V to 5.25V.
  • To cascade multiple SN74LS191NSR counters, connect the TC (terminal count) output of one counter to the CLK (clock) input of the next counter. This will allow the counters to count in sequence, creating a larger counter.

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About Texas Instruments

Texas Instruments (TI) designs and manufactures semiconductors and integrated circuits for a wide range of applications. The company's product portfolio includes analog chips, which are essential for managing power and signal functions in electronic devices, and embedded processors, which serve as the brains in various systems, enabling functionality in everything from industrial equipment to consumer electronics. TI's innovations in semiconductor technology have made it a leader in the industry.

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