To all our customers
Regarding the change of names mentioned in the document, such as Hitachi
Electric and Hitachi XX, to Renesas Technology Corp.
The semiconductor operations of Mitsubishi Electric and Hitachi were transferred to Renesas
Technology Corporation on April 1st 2003. These operations include microcomputer, logic, analog
and discrete devices, and memory chips other than DRAMs (flash memory, SRAMs etc.)
Accordingly, although Hitachi, Hitachi, Ltd., Hitachi Semiconductors, and other Hitachi brand
names are mentioned in the document, these names have in fact all been changed to Renesas
Technology Corp. Thank you for your understanding. Except for our corporate trademark, logo and
corporate statement, no changes whatsoever have been made to the contents of the document, and
these changes do not constitute any alteration to the contents of the document itself.
Renesas Technology Home Page: http://www.renesas.com
Renesas Technology Corp.
Customer Support Dept.
April 1, 2003
HD74HC165
Parallel-load 8-bit Shift Register
ADE-205-457 (Z)
1st. Edition
Sep. 2000
Description
This 8-bit serial shift register shifts data from QA to QH when clocked. Parallel inputs to each stage are
enabled by a low level at the Shift/Load input. Also included is a gated clock input and a complementary
output from the eighth bit.
Clocking is accomplished through a 2-input NOR gate permitting one input to be used as a clock inhibit
function. Holding either of the clock inputs high inhibits clocking, and holding either clock input low with
the Shift/Load input high enables the other clock input. Data transfer occurs on the positive going edge of
the clock. Parallel loading is inhibited as long as the Shift/Load input is high. When taken low, data at the
parallel inputs is loaded directly into the register independent of the state of the clock.
Features
•
•
•
•
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High Speed Operation: tpd (Clock to QH) = 21 ns typ (CL = 50 pF)
High Output Current: Fanout of 10 LSTTL Loads
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
Inputs
Parallel
Internal outputs
Output
Shift/Load
Clock Inhibit
Clock
Serial
A ······ H
QA
QB
QH
L
X
X
X
a ······h
a
b
h
H
L
L
X
X
QA0
QB0
QH0
H
L
H
X
H
QAn
QGn
H
L
L
X
L
QAn
QGn
H
H
X
X
QA0
QB0
QH0
X