SN74AC373NG4
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Texas Instruments SN74AC373NG4

Manufacturer No:
SN74AC373NG4
Manufacturer:
Texas Instruments
Package:
Tube
Description:
IC OCTAL D TRANSP LATCH 20-DIP
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Payment:
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Product Introduction

Overview

The SN74AC373NG4 is an octal D-type transparent latch produced by Texas Instruments. This component is part of the 74AC family, known for its high-speed and low-power CMOS logic. The device features eight D-type latches with 3-state outputs, making it suitable for a variety of applications including buffer registers, I/O ports, bidirectional bus drivers, and working registers.

When the latch-enable (LE) input is high, the Q outputs follow the data (D) inputs. When LE is taken low, the Q outputs are latched at the logic levels set up at the D inputs. A buffered output-enable (OE) input allows the outputs to be placed in either a normal logic state or a high-impedance state, enabling direct drive of bus lines.

Key Specifications

Parameter Unit Min Typ Max
VCC Supply Voltage V 2 6
VIH High-Level Input Voltage (VCC = 5.5V) V 3.85
VIL Low-Level Input Voltage (VCC = 5.5V) V 1.65
IOH High-Level Output Current (VCC = 5.5V) mA -24
IOL Low-Level Output Current (VCC = 5.5V) mA 24
TA Operating Free-Air Temperature °C -40 85
tPLH Propagation Delay Time (VCC = 5V) ns 1.5 7 9.5
tPHL Propagation Delay Time (VCC = 5V) ns 1.5 7 9.5
tw Pulse Duration, LE High (VCC = 5V) ns 4 5
tsu Setup Time, Data Before LE↓ (VCC = 5V) ns 4 5
th Hold Time, Data After LE↓ (VCC = 5V) ns 1

Key Features

  • Operation over a wide VCC range of 2V to 6V.
  • Inputs accept voltages up to 6V.
  • Maximum propagation delay time of 9.5ns at VCC = 5V.
  • 3-state noninverting outputs capable of driving bus lines directly.
  • Full parallel access for loading data.
  • Buffered output-enable input for high-impedance state control.
  • Suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.

Applications

  • Buffer registers: To temporarily store data and protect it from changes.
  • I/O ports: For controlling and managing input/output operations in digital systems.
  • Bidirectional bus drivers: To manage data flow in both directions on a bus line.
  • Working registers: For temporary storage and manipulation of data within a system.
  • General-purpose logic circuits: Where high-speed and low-power logic operations are required.

Q & A

  1. What is the operating voltage range of the SN74AC373NG4?

    The SN74AC373NG4 operates over a VCC range of 2V to 6V.

  2. What is the maximum propagation delay time at VCC = 5V?

    The maximum propagation delay time at VCC = 5V is 9.5ns.

  3. What is the purpose of the output-enable (OE) input?

    The output-enable (OE) input allows the outputs to be placed in either a normal logic state or a high-impedance state.

  4. What are the typical applications of the SN74AC373NG4?

    The SN74AC373NG4 is typically used in buffer registers, I/O ports, bidirectional bus drivers, and working registers.

  5. What is the significance of the latch-enable (LE) input?

    The latch-enable (LE) input controls whether the Q outputs follow the D inputs or are latched at the current logic levels.

  6. What are the package options available for the SN74AC373NG4?

    The SN74AC373NG4 is available in various packages including SSOP, SOIC, PDIP, SOP, and TSSOP.

  7. What is the maximum continuous output current per output?

    The maximum continuous output current per output is ±50 mA.

  8. What is the recommended operating temperature range?

    The recommended operating temperature range is -40°C to 85°C.

  9. How should unused inputs be handled for proper device operation?

    Unused inputs must be held at VCC or GND for proper device operation.

  10. What is the significance of the 3-state outputs?

    The 3-state outputs are designed to drive highly capacitive or relatively low-impedance loads directly and can be placed in a high-impedance state.

Product Attributes

Logic Type:D-Type Transparent Latch
Circuit:8:8
Output Type:Tri-State
Voltage - Supply:2V ~ 6V
Independent Circuits:1
Delay Time - Propagation:7.5ns
Current - Output High, Low:24mA, 24mA
Operating Temperature:-40°C ~ 85°C
Mounting Type:Through Hole
Package / Case:20-DIP (0.300", 7.62mm)
Supplier Device Package:20-PDIP
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