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2012-06-08T12:16:23-07:00
BroadVision, Inc.
2020-10-30T11:33:12+08:00
2020-10-30T11:33:12+08:00
Acrobat Distiller 10.1.3 (Windows)
application/pdf
MC74HC259A - 8-Bit Addressable Latch 1-of-8 Decoder
ON Semiconductor
High−Performance Silicon−Gate CMOS
The MC74HC259A is identical in pinout to the LS259. The device
inputs are compatible with standard CMOS outputs; with pullup
resistors, they are compatible with LSTTL outputs.
The HC259A has four modes of operation as shown in the mode
selection table. In the addressable latch mode, the data on Data In is
written into the addressed latch. The addressed latch follows the data
input with all non−addressed latches remaining in their previous
states. In the memory mode, all latches remain in their previous state
and are unaffected by the Data or Address inputs. In the one−of−eight
decoding or demultiplexing mode, the addressed output follows the
state of Data In with all other outputs in the LOW state. In the Reset
mode all outputs are LOW and unaffected by the address and data
inputs. When operating the HC259A as an addressable latch, changing
more than one bit of the address could impose a transient wrong
address. Therefore, this should only be done while in the memory
mode.
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