SN74ALS652A

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Octal Bus Transceivers/Registers With 3-State Outputs

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Product details

Parameters

Technology Family ALS VCC (Min) (V) 4.5, 4.75 VCC (Max) (V) 5.5, 5.25 Bits (#) 8 Voltage (Nom) (V) 5 F @ nom voltage (Max) (MHz) 40 ICC @ nom voltage (Max) (mA) 82 Propagation delay (Max) (ns) 18 IOL (Max) (mA) 24 IOH (Max) (mA) -15 Operating temperature range (C) 0 to 70 open-in-new Find other Registered transceiver

Package | Pins | Size

SOIC (DW) 24 160 mm² 15.5 x 10.3 open-in-new Find other Registered transceiver

Features

  • Bus Transceivers/Registers
  • Independent Registers and Enables for A and B Buses
  • Multiplexed Real-Time and Stored Data
  • Choice of True or Inverting Data Paths
  • Choice of 3-State or Open-Collector Outputs to A Bus
    DEVICE
    A OUTPUT
    B OUTPUT
    LOGIC
    SN74ALS651A, 'AS651
    3-State
    3-State
    Inverting
    SN54ALS652, SN74ALS652A, 'AS652
    3-State
    3-State
    True
    'ALS653
    Open Collector
    3-State
    Inverting
    SN74ALS654
    Open Collector
    3-State
    True
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Description

These devices consist of bus-transceiver circuits, D-type flip-flops, and control circuitry arranged for multiplexed transmission of data directly from the data bus or from the internal storage registers. Output-enable (OEAB and OEBA\) inputs are provided to control the transceiver functions. Select-control (SAB and SBA) inputs are provided to select real-time or stored data transfer. The circuitry used for select control eliminates the typical decoding glitch that occurs in a multiplexer during the transition between stored and real-time data. A low input level selects real-time data, and a high input level selects stored data. Figure 1 illustrates the four fundamental bus-management functions that can be performed with the octal bus transceivers and registers

Data on the A or B data bus, or both, can be stored in the internal D-type flip-flops by low-to-high transitions at the appropriate clock (CLKAB or CLKBA) terminals, regardless of the select- or output-control terminals. When SAB and SBA are in the real-time transfer mode, it is possible to store data without using the internal D-type flip-flops by simultaneously enabling OEAB and OEBA\. In this configuration, each output reinforces its input. When all other data sources to the two sets of bus lines are at high impedance, each set of bus lines remains at its last state.

The -1 versions of the SN74ALS651A and SN74ALS652A are identical to the standard versions except that the recommended maximum IOL for the -1 versions is increased to 48 mA. There are no -1 versions of the SN54ALS652, SN54ALS653, SN74ALS653, and SN74ALS654.

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Technical documentation

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Type Title Date
* Datasheet Octal Bus Transceivers And Registers With 3-State Outputs datasheet (Rev. G) Dec. 07, 2000
Selection guides Logic Guide (Rev. AB) Jun. 12, 2017
Application notes Understanding and Interpreting Standard-Logic Data Sheets (Rev. C) Dec. 02, 2015
User guides LOGIC Pocket Data Book (Rev. B) Jan. 16, 2007
Application notes Semiconductor Packing Material Electrostatic Discharge (ESD) Protection Jul. 08, 2004
More literature Logic Cross-Reference (Rev. A) Oct. 07, 2003
Application notes TI IBIS File Creation, Validation, and Distribution Processes Aug. 29, 2002
Application notes Bus-Interface Devices With Output-Damping Resistors Or Reduced-Drive Outputs (Rev. A) Aug. 01, 1997
Application notes Designing With Logic (Rev. C) Jun. 01, 1997
Application notes Input and Output Characteristics of Digital Integrated Circuits Oct. 01, 1996
Application notes Live Insertion Oct. 01, 1996
Application notes Advanced Schottky (ALS and AS) Logic Families Aug. 01, 1995

Design & development

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Hardware development

EVALUATION BOARDS Download
document-generic User guide
10
Description
This EVM is designed to support any logic device that has a D, DW, DB, NS, PW, P, N, or DGV package in a 14 to 24 pin count.
Features
  • Board design allows for versatility in evaluation
  • Supports a wide-range of logic devices

CAD/CAE symbols

Package Pins Download
SOIC (DW) 24 View options

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