74HC594D Ver la hoja de datos (PDF) - Philips Electronics
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74HC594D Datasheet PDF : 10 Pages
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Philips Semiconductors
8-bit shift register with output register
Product specification
74HC/HCT594
handbook, halfpage
14 D S
11 SHCP
10 SH R
8-STAGE SHIFT REGISTER
12 STCP
13 ST R
8-BIT STORAGE REGISTER
Q7' 9
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
15 1 2 3 4 5 6 7 MBC320
Fig.4 Functional diagram.
FUNCTION TABLE
INPUTS
SHCP STCP SHR
X
X
L
X
X
X
X
↑
L
↑
X
H
STR
X
L
H
X
DS
X
X
X
H
X
↑
H
H
X
↑
↑
H
H
X
OUTPUTS
Q7’ Qn
FUNCTION
L NC a LOW level on SHR only affects the shift registers.
NC L a LOW level on STR only affects the storage registers.
L L empty shift register loaded into storage register.
Q6’ NC logic HIGH level shifted into shift register stage 0. Contents of all
shift register stages shifted through, e.g. previous state of stage
6 (internal Q6’) appears on the serial output (Q7’).
NC Qn’ contents of shift register stages (internal Qn’) are transferred to
the storage register and parallel output stages.
Q6n Qn’
contents of shift register shifted through. Previous contents of
shift register transferred to the storage register and the parallel
output stages.
Note
1. H = HIGH voltage level
L = LOW voltage level
↑ = LOW-to-HIGH transition
NC = no change
X = don’t care.
December 1991
4
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