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CDP1857C

Part Number	CDP1857C
Manufacturer	Intersil Corporation
Description	4-Bit Bus Buffer/Separator
Published	Mar 23, 2005
Detailed Description	CDP1857C March 1997 4-Bit Bus Buffer/Separator Description The CDP1857C is a 4-bit CMOS non-inverting bus separator des...
Datasheet	CDP1857C PDF File

Overview

CDP1857C March 1997 4-Bit Bus Buffer/Separator Description The CDP1857C is a 4-bit CMOS non-inverting bus separator designed for use in CDP1800-series microprocessor systems.
It can be controlled directly by a 1800-series microprocessor without the use of additional components.
The CDP1857 is designed for use as a bus buffer or separator between the 1800-series microprocessor data bus and I/O devices.
It provides a chip-select (CS) input signal which, when high (1), enables the bus-separator three-state output drivers.
The direction of data ﬂow, when enabled, is controlled by the MRD input signal.
In the CDP1857, when MRD = 1, it enables the three-state bus drivers (DB0-DB3) and transfers data from the DATA-IN lines onto the data bus.
When MRD = 0, it disables the three-state bus drivers (DB0DB3) and enables the three-state data output drivers (DO0-DO3), thus, transferring data from the data bus to the DATA-OUT terminals.
The CDP1857 can be used as a bidirectional bus buffer by connec...

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