[ /Title
(CD74H
C670,
CD74H
CT670)
/Subject
(HighSpeed
CMOS
Logic
4x4 Register CD54HC670, CD74HC670,
CD74HCT670
Data sheet acquired from Harris Semiconductor
SCHS195C High-Speed CMOS Logic
4x4 Register File January 1998 -Revised October 2003 Features Description Simultaneous and Independent Read and Write
Operations Fanout (Over Temperature Range)
-Standard Outputs . 10 LSTTL Loads
-Bus Driver Outputs . 15 LSTTL Loads The ’HC670 and CD74HCT670 are 16-bit register files
organized as 4 words x 4 bits each. Read and write address
and enable inputs allow simultaneous writing into one location
while reading another. Four data inputs are provided to store
the 4-bit word. The write address inputs (WA0 and WA1)
determine the location of the stored word in the register.
When write enable (WE) is low the word is entered into the …
