The Harris CD74HC165 and CD74HCT165 are 8-bit parallel
or serial-in shift registers with complementary serial outputs
(Q
and Q7) available from the last stage. When the parallel
7
load (
PL) input is LOW, parallel data from the D0 to D7
inputs are loaded into the register asynchronously. When the
PL is HIGH, data enters the register serially at the DS input
and shifts one place to the right (Q
0→Q1→Q2
, etc.) with
each positive-going clock transition. This feature allow parallel-to-serial converter expansion by typing the Q
output to
7
the DS input of the succeeding device.
For predictable operation the LOW-to-HIGH transition of
should only take place while CP is HIGH. Also, CP an d
CE
CE
should be LOW before the LOW-to-HIGH transition of PL to
Functional Diagram
11
D0
12
D1
13
D2
PARALLEL
DAT A
INPUTS
D3
D4
D5
D6
D7
DS
14
3
4
5
6
10
prevent shifting the data when
PL goes HIGH.
Ordering Information
TEMP.RANGE
PART NUMBER
CD74HC165E-55 to 12516 Ld PDIPE16.3
CD74HCT165E-55 to 12516 Ld PDIPE16.3
CD74HC165M-55 to 12516 Ld SOICM16.15
CD74HCT165M-55 to 12516 Ld SOICM16.15
NOTES:
1. When ordering, use the entire partnumber. Add the suffix 96 to
obtain the variant in the tape and reel.
2. Wafer and die is available which meets all electrical
specifications. Please contact your local sales office or Harris
customer service for ordering information.
9
Q
7
SERIAL
7
OUTPUTS
Q
7
(oC)PACKAGEPKG. NO.
151
PL
CE
CP
2
GND = 8
VCC = 16
TRUTH TABLE
INPUTSQn REGISTEROUTPUTS
OPERATING MODE
PLCECPDSD0 - D7Q
Q1 - Q
0
Q
6
7
Parallel LoadLXXXLLL-LLH
LXXXHHH-HHL
Serial ShiftHL↑lXLq
HL↑hXHq
Hold Do NothingHHXXXq
0
0 -q5
0 -q5
q
1 -q6
q
6
q
6
q
7
Q
7
q
6
q
6
q
7
2
CD74HC165, CD74HCT165
TRUTH TABLE
INPUTSQn REGISTEROUTPUTS
OPERATING MODE
NOTE:
H = High Voltage Level
h = High Voltage Level One Set-up Time Prior To The Low-to-high Clock Transition
l= Low Voltage Level One Set-up Time Prior To The Low-to-high Clock Transition
L = Low Voltage Level
X = Don’t Care
↑ = Transition from Low to High Level
qn= Lower Case Letters Indicate The State Of the Reference Output Clock Transition
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE:
3. θJA is measured with the component mounted on an evaluation PC board in free air.
T exas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty . Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICA TIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERST OOD TO
BE FULLY AT THE CUSTOMER’S RISK.
In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
semiconductor products or services might be or are used. TI’s publication of information regarding any third
party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.
Copyright 1998, Texas Instruments Incorporated
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