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ꢋ ꢉꢌꢍ ꢎ ꢏꢈꢐꢈ ꢑꢑ ꢒꢑ ꢉꢑ ꢓ ꢈꢔ ꢀꢄ ꢍꢕ ꢎ ꢐꢒ ꢖ ꢍꢀ ꢎꢒ ꢐ
SCLS538A − AUGUST 2003 − REVISED APRIL 2008
D
D
Qualified for Automotive Applications
D
D
D
D
Low Input Current of 1 µA Max
Synchronous Load
ESD Protection Exceeds 2000 V Per
MIL-STD-883, Method 3015; Exceeds 200 V
Using Machine Model (C = 200 pF, R = 0)
Direct Overriding Clear
Parallel-to-Serial Conversion
D
D
D
D
D
Wide Operating Voltage Range of 2 V to 6 V
Outputs Can Drive Up To 10 LSTTL Loads
D OR PW PACKAGE
(TOP VIEW)
Low Power Consumption, 80-µA Max I
Typical t = 13 ns
pd
4-mA Output Drive at 5 V
CC
SER
V
CC
SH/LD
H
1
2
3
4
5
6
7
8
16
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10
9
A
B
C
Q
H
G
D
description/ordering information
CLK INH
CLK
F
This parallel-in or serial-in, serial-out register
features gated clock (CLK, CLK INH) inputs and an
overriding clear (CLR) input. The parallel-in or
serial-in modes are established by the shift/load
E
GND
CLR
(SH/LD) input. When high, SH/LD enables the serial (SER) data input and couples the eight flip-flops for serial
shifting with each clock (CLK) pulse. When low, the parallel (broadside) data inputs are enabled, and
synchronous loading occurs on the next clock pulse. During parallel loading, serial data flow is inhibited.
Clocking is accomplished on the low-to-high-level edge of CLK through a 2-input positive-NOR gate, permitting
one input to be used as a clock-enable or clock-inhibit function. Holding either CLK or CLK INH high inhibits
clocking; holding either low enables the other clock input. This allows the system clock to be free running, and
the register can be stopped on command with the other clock input. CLK INH should be changed to the high
level only when CLK is high. CLR overrides all other inputs, including CLK, and resets all flip-flops to zero.
{
ORDERING INFORMATION
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
‡
PACKAGE
T
A
SOIC − D
Tape and reel
Tape and reel
SN74HC166AIDRQ1
SN74HC166AIPWRQ1
HC166AI
HC166AI
−40°C to 85°C
TSSOP − PW
†
‡
For the most current package and ordering information, see the Package Option Addendum at the end of this
document, or see the TI web site at http://www.ti.com.
Package drawings, thermal data, and symbolization are available at http://www.ti.com/packaging.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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Copyright 2008, Texas Instruments Incorporated
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