SN74ALS990 8-BIT D-TYPE TRANSPARENT READ-BACK LATCH

SDAS027B - APRIL 1984 - REVISED JANUARY 1995

features

3-State I/O-Type Read-Back Inputs
Bus-Structured Pinout
True Logic Outputs
Package Options Include Plastic Small-Outline (DW) Packages and Standard Plastic (N) 300-mil DIPs

description

This 8-bit latch is designed specifically for storing the contentsof the input data bus and providing the capability of reading backthe stored data onto the input data bus.

The eight latches are transparent D-type latches. While thelatch-enable (LE) input is high, the Q outputs follow the data (D)inputs.

Read back is provided through the output-enable () input. When is taken low, the data present atthe output of the data latches is allowed to pass back onto the inputdata bus. When is taken high,the output of the data latches is isolated from the D inputs. does not affect the internaloperation of the latches; however, precautions should be taken not tocreate a bus conflict.

The SN74ALS990 is characterized for operation from 0°C to70°C.

Title: 8-BIT D-TYPE TRANSPARENT READ-BACK LATCH
Product Family: D-TYPE (3-STATE) LATCHES
Device Functionality: OCTAL D-TYPE READ-BACK LATCH
Orderable Devices: SN74ALS990DW, SN74ALS990DWR, SN74ALS990N, SN74ALS990N3

View the complete PDF datasheet: sdas027b.pdf (89 K Bytes) (Requires Acrobat Reader 3.x)

View more information about generic part numbers:SN74ALS990

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