74HC164
8-BIT PARALLEL-OUT SERIAL SHIFT REGISTERS
Description
Pin Assignments
The 74HC164 is a serial input 8-bit edge-triggered shift register that
has outputs from each of eight stages.
(Top View
)
SERIAL DATA INPUT PINS
14
1
2
3
Vcc
Q7
Q6
Q5
DSA
DSB
Q0
The serial input data is entered at pin SDA or pin SDB as these are
logically ANDED. Either input could be used as an active HIGH
enable with data entry on the other pin. If a single input is desired, the
pins can be tied together or the unused input can be tied HIGH.
13
12
11
10
4
5
6
7
Q1
Q2
Q4
DATA ENTRY
Data is shifted into Q0 from the serial input pins on each LOW to
HIGH transition of the CP pin. Also during the CP edge the data is
transferred from each Qn to Qn+1. The serial data on pins DSA and
DSB must be stable before and after the CP rising edge to meet the
set-up and hold timing requirements.
9
8
MR
Q3
GND
CP
SO-14 / TSSOP-14 / PDIP-14
RESET
When asserted LOW the Master Reset ( MR ) pin sets all Qn to LOW.
This action does not depend on the condition of serial input or clock
pins. The MR must be asserted HIGH for a recovery time before the
next CP positive edge pulse.
Features
Applications
Wide Supply Voltage Range from 2.0V to 6.0V
Sinks or Sources 4mA at VCC = 4.5V
CMOS Low Power Consumption
General Purpose Logic
Wide Array of Products Such as:
.
.
.
PCs, Networking, Notebooks, Netbooks
Computer Peripherals, Hard Drives, CD/DVD ROM
TV, DVD, DVR, Set-Top Box
Schmitt Trigger Action at all Inputs
ESD Protection Exceeds JESD 22
.
.
.
200-V Machine Model (A115)
2000-V Human Body Model (A114)
Exceeds 1000-V Charged Device Model (C101)
Range of Package Options SO-14 and TSSOP-14
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Device Ordering Information is on Page 7
1 of 10
www.diodes.com
March 2015
© Diodes Incorporated
74HC164
Document number: DS36279 Rev. 2- 2
DIODES [ DIODES INCORPORATED ]
