SN54HC161 Datasheet, PDF (1/24 Pages) Texas Instruments – 4-BIT SYNCHRONOUS BINARY COUNTERS

D Wide Operating Voltage Range of 2 V to 6 V
D Outputs Can Drive Up To 10 LSTTL Loads
D Low Power Consumption, 80-µA Max I_CC
D Typical t_pd = 14 ns
D ±4-mA Output Drive at 5 V
SN54HC161 . . . J OR W PACKAGE
SN74HC161 . . . D, N, NS, OR PW PACKAGE
(TOP VIEW)
CLR 1
CLK 2
A3
B4
C5
D6
ENP 7
GND ⁸
16 V_CC
15 RCO
14 Q_A
13 Q_B
12 Q_C
11 Q_D
10 ENT
9 _LOAD
SN54HC161, SN74HC161
4ĆBIT SYNCHRONOUS BINARY COUNTERS
SCLS297D − JANUARY 1996 − REVISED SEPTEMBER 2003
D Low Input Current of 1 µA Max
D Internal Look-Ahead for Fast Counting
D Carry Output for n-Bit Cascading
D Synchronous Counting
D Synchronously Programmable
SN54HC161 . . . FK PACKAGE
(TOP VIEW)
3 2 1 20 19
A4
18 Q_A
B5
17 Q_B
NC 6
16 NC
C7
15 Q_C
D
8
14
9 10 11 12 13
Q_D
description/ordering information
NC − No internal connection
These synchronous, presettable counters feature an internal carry look-ahead for application in high-speed
counting designs. The ’HC161 devices are 4-bit binary counters. Synchronous operation is provided by having
all flip-flops clocked simultaneously so that the outputs change coincident with each other when so instructed
by the count-enable (ENP, ENT) inputs and internal gating. This mode of operation eliminates the output
counting spikes that are normally associated with synchronous (ripple-clock) counters. A buffered clock (CLK)
input triggers the four flip-flops on the rising (positive-going) edge of the clock waveform.
ORDERING INFORMATION
TA
PACKAGE†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP − N
Tube of 25
SN74HC161N
SN74HC161N
Tube of 40
SN74HC161D
−40°C to 85°C
SOIC − D
SOP − NS
Reel of 2500
Reel of 250
Reel of 2000
SN74HC161DR
SN74HC161DT
SN74HC161NSR
HC161
HC161
Tube of 90
SN74HC161PW
TSSOP − PW
Reel of 2000
Reel of 250
SN74HC161PWR
SN74HC161PWT
HC161
CDIP − J
Tube of 25
SNJ54HC161J
SNJ54HC161J
−55°C to 125°C CFP − W
Tube of 150
SNJ54HC161W
SNJ54HC161W
LCCC − FK
Tube of 55
SNJ54HC161FK
SNJ54HC161FK
† _{Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are}
available at www.ti.com/sc/package.
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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright  2003, Texas Instruments Incorporated
On products compliant to MILĆPRFĆ38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
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