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SN74LS245DB 产品手册 - TI（德州仪器）
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SN74LS245DB数据手册
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SCLS297D − JANUARY 1996 − REVISED SEPTEMBER 2003
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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
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 ...J OR W PACKAGE
SN74HC161 . . . D, N, NS, OR PW PACKAGE
(TOP VIEW)
3212019
910111213
4
5
6
7
8
18
17
16
15
14
Q
A
Q
B
NC
Q
C
Q
D
A
B
NC
C
D
SN54HC161 . . . FK PACKAGE
(TOP VIEW)
CLK
CLR
NC
LOAD
ENT
RCO
ENP
GND
NC
V
CC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CLR
CLK
A
B
C
D
ENP
GND
V
CC
RCO
Q
A
Q
B
Q
C
Q
D
ENT
LOAD
NC − No internal connection
description/ordering information
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
T
A
PACKAGE
†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP − N Tube of 25 SN74HC161N SN74HC161N
Tube of 40 SN74HC161D
SOIC − D
Reel of 2500 SN74HC161DR
HC161
−40°C to 85°C
SOIC − D
Reel of 250 SN74HC161DT
HC161
−40°C to 85°C
SOP − NS Reel of 2000 SN74HC161NSR HC161
Tube of 90 SN74HC161PW
TSSOP − PW
Reel of 2000 SN74HC161PWR
HC161
TSSOP − PW
Reel of 250 SN74HC161PWT
HC161
CDIP − J Tube of 25 SNJ54HC161J SNJ54HC161J
−55°C to 125°C
CFP − W Tube of 150 SNJ54HC161W SNJ54HC161W
−55 C to 125 C
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 o
f
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright 2003, Texas Instruments Incorporated
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