REI Datasheet
SN54ALS646 thru SN54ALS649, SN54AS646, SN54AS648
SN74ALS646 thru SN74ALS649, SN74AS646, SN74AS648
Octal Bus Transceivers and Registers
These devices consist of bus transceivers circuits, with 3-state or open-collector outputs, D-type
flip-flops, and control circuitry arranged for multiplexed transmission of data directly from the data
bus or from the internal storage registers. Data on the A or B bus will be clocked into the registers
on the low-to-high transition of the appropriate clock pin (CAB or CBA). The following examples
demonstrate the four fundamental bus-management functions that can be performed with the octal
bus transceivers and registers.
Rochester Electronics
Manufactured Components
Rochester branded components are
manufactured using either die/wafers
purchased from the original suppliers
or Rochester wafers recreated from the
original IP. All recreations are done with
the approval of the OCM.
Parts are tested using original factory
test programs or Rochester developed
test solutions to guarantee product
meets or exceeds the OCM data sheet.
Quality Overview
•
ISO-9001
• AS9120 certification
• Qualified Manufacturers List (QML) MIL-PRF-38535
• Class Q Military
• Class V Space Level
• Qualified Suppliers List of Distributors (QSLD)
• Rochester is a critical supplier to DLA and
meets all industry and DLA standards.
Rochester Electronics, LLC is committed to supplying
products that satisfy customer expectations for
quality and are equal to those originally supplied by
industry manufacturers.
The original manufacturer’s datasheet accompanying this document reflects the performance
and specifications of the Rochester manufactured version of this device. Rochester Electronics
guarantees the performance of its semiconductor products to the original OEM specifications.
‘Typical’ values are for reference purposes only. Certain minimum or maximum ratings may be
based on product characterization, design, simulation, or sample testing.
© 2013 Rochester Electronics, LLC. All Rights Reserved 12232013
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