REI Datasheet
SN54HC658, SN54HC659, SN74HC658, SN74HC658
Octal Bus Transceivers with Parity
These octal bus transceivers are designed for asynchronous, bidirectional communication between
data buses. The devices transmit data from the A Bus to the B bus or from the B Bus to the A Bus,
depending on the level at the direction control inputs, GAB and GBA. These devices also generate
parity outputs, APO and BPO, which reflect the number of high levels at the A Bus and B Bus,
respectively, taking into account the parity inputs API and BPI.
The bidirectional I/O ports feature active circuitry on the input stage that, when the output shared
by that pin is disabled, will maintain the input in the last state taken by the output. This state will be
maintained until changed by activity on the bus. The advantage of this arrangement is that when
all outputs on the bus are disabled, the inputs will be prevented from floating, resulting in minimum
power dissipation and minimum susceptibility to noise. This eliminates any need for external pull-up
or pull-down resistors. The parity inputs API and BPI have similar circuits.
Quality Overview
Rochester Electronics
Manufactured Components
•
•
•
ISO-9001
AS9120 certification
Qualified Manufacturers List (QML) MIL-PRF-38535
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.
•
•
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.
Parts are tested using original factory
test programs or Rochester developed
test solutions to guarantee product
meets or exceeds the OCM data sheet.
RochesterElectronics, LLCiscommittedtosupplying
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 12302013
To learn more, please visit www.rocelec.com
ROCHESTER [ Rochester Electronics ]
