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SN54HC191 Datasheet(PDF) 1 Page - Texas Instruments

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Part No. SN54HC191
Description  4-BIT SYNCHRONOUS UP/DOWN BINARY COUNTERS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

SN54HC191 Datasheet(HTML) 1 Page - Texas Instruments

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SN54HC191, SN74HC191
4BIT SYNCHRONOUS UP/DOWN BINARY COUNTERS
SCLS121D − DECEMBER 1982 − REVISED OCTOBER 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 ICC
D Typical tpd = 13 ns
D ±4-mA Output Drive at 5 V
D Low Input Current of 1 µA Max
D Single Down/Up Count-Control Line
D Look-Ahead Circuitry Enhances Speed of
Cascaded Counters
D Fully Synchronous in Count Modes
D Asynchronously Presettable With Load
Control
description/ordering information
The ’HC191 devices are 4-bit synchronous,
reversible,
up/down
binary
counters.
Synchronous counting operation is provided by
having all flip-flops clocked simultaneously so that
the outputs change coincident with each other
when instructed by the steering logic. This mode
of operation eliminates the output counting spikes
normally
associated
with
asynchronous
(ripple-clock) counters.
The outputs of the four flip-flops are triggered on
a low- to high-level transition of the clock (CLK)
input if the count-enable (CTEN) input is low. A
high at CTEN inhibits counting. The direction of
the count is determined by the level of the
down/up (D/U) input. When D/U is low, the counter
counts up, and when D/U is high, it counts down.
ORDERING INFORMATION
TA
PACKAGE†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP − N
Tube of 25
SN74HC191N
SN74HC191N
Tube of 40
SN74HC191D
−40
°C to 85°C
SOIC − D
Reel of 2500
SN74HC191DR
HC191
−40 C to 85 C
SOIC − D
Reel of 250
SN74HC191DT
HC191
SOP − NS
Reel of 2000
SN74HC191NSR
HC191
CDIP − J
Tube of 25
SNJ54HC191J
SNJ54HC191J
−55
°C to 125°C
CFP − W
Tube of 150
SNJ54HC191W
SNJ54HC191W
−55 C to 125 C
LCCC − FK
Tube of 55
SNJ54HC191FK
SNJ54HC191FK
† 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.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
B
QB
QA
CTEN
D/U
QC
QD
GND
VCC
A
CLK
RCO
MAX/MIN
LOAD
C
D
SN54HC191 ...J OR W PACKAGE
SN74HC191 . . . D, N, OR NS PACKAGE
(TOP VIEW)
32 1 20 19
910 11 1213
4
5
6
7
8
18
17
16
15
14
CLK
RCO
NC
MAX/MIN
LOAD
QA
CTEN
NC
D/U
QC
SN54HC191 . . . FK PACKAGE
(TOP VIEW)
NC − No internal connection
Copyright
 2003, Texas Instruments Incorporated
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.
On products compliant to MILPRF38535, 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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