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SCHS275E − MARCH 2002 − REVISED OCTOBER 2003
CD54HC190, 191; CD54HCT191 . . . F PACKAGE
CD74HC190 . . . E, NS, OR PW PACKAGE
CD74HC191, CD74HCT191 . . . E OR M PACKAGE
(TOP VIEW)
D
D
D
D
D
D
D
D
D
2-V to 6-V V
Operation (’HC190, 191)
CC
4.5-V to 5.5-V V
Operation (’HCT191)
CC
Wide Operating Temperature Range of
−55°C to 125°C
Synchronous Counting and Asynchronous
Loading
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
B
V
A
CC
Q
Q
B
A
CLK
RCO
MAX/MIN
LOAD
C
Two Outputs for n-Bit Cascading
CTEN
D/U
Look-Ahead Carry for High-Speed Counting
Q
Balanced Propagation Delays and
Transition Times
C
Q
D
GND
D
Standard Outputs Drive Up To 15 LS-TTL
Loads
Significant Power Reduction Compared to
LS-TTL Logic ICs
description/ordering information
The CD54/74HC190 are asynchronously presettable BCD decade counters, whereas the CD54/74HC191 and
CD54/74HCT191 are asynchronously presettable binary counters.
Presetting the counter to the number on preset data inputs (A−D) is accomplished by a low asynchronous
parallel load (LOAD) input. Counting occurs when LOAD is high, count enable (CTEN) is low, and the down/up
(D/U) input is either high for down counting or low for up counting. The counter is decremented or incremented
synchronously with the low-to-high transition of the clock.
ORDERING INFORMATION
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
†
PACKAGE
T
A
CD74HC190E
CD74HC190E
CD74HC191E
CD74HCT191E
CD74HC191E
PDIP − E
SOIC − M
Tube of 25
CD74HCT191E
CD74HC191M
Tube of 40
Reel of 2500
Reel of 250
Tube of 40
Reel of 2000
Tube of 90
Reel of 2000
Reel of 250
CD74HC191M96
CD74HC191MT
CD74HCT191M
CD74HC190NSR
CD74HC190PW
CD74HC190PWR
CD74HC190PWT
CD54HC190F3A
CD54HC191F3A
HC191M
HCT191M
HC190M
−55°C to 125°C
SOP − NS
TSSOP − PW
HJ190
CD54HC190F3A
CD54HC191F3A
CD54HCT191F3A
CDIP − F
Tube of 25
CD54HCT191F3A
†
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.
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Copyright 2003, Texas Instruments Incorporated
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