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Hitachi Semiconductor - 8-bit Shift Register/Latch (with 3-state outputs)

Numéro de référence HD74HC595
Description 8-bit Shift Register/Latch (with 3-state outputs)
Fabricant Hitachi Semiconductor 
Logo Hitachi Semiconductor 





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HD74HC595 fiche technique
HD74HC595
8-bit Shift Register/Latch (with 3-state outputs)
Description
This device each contains an 8-bit serial-in, parallel-out shift register that feeds an 8-bit D-type storage
register. The storage register has parallel 3-state outputs. Separate clocks are provided for both the shift
register and the storage register. The shift register has a direct-overriding clear, serial input, and serial
output pins for cascading.
Both the shift register and storage register clocks are positive-edge triggered. If the user wishes to connect
both clocks together, the shift register state will always be one clock pulse ahead of the storage register.
Features
High Speed Operation: tpd (RCK to Q) = 17 ns typ (CL = 50 pF)
High Output Current: Fanout of 15 LSTTL Loads (QA to QH outputs)
Wide Operating Voltage: VCC = 2 to 6 V
Low Input Current: 1 µA max
Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
Function Table
RCK
X
X
X
SCK
X
X
X
SCLR
X
L
H
H
G
H
X
X
X
Function
QA to QH high impedance
Shift register cleared QH’ = L
Shift register clocked Qn = Qn – 1, QA = SER
Contents of shift register transferred to output latches

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