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CD74AC191M Arkusz danych(PDF) 1 Page - Texas Instruments

Numer części CD74AC191M
Szczegółowy opis  Presettable Synchronous 4-Bit Binary Up/Down Counter
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CD74AC191M Arkusz danych(HTML) 1 Page - Texas Instruments

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Data sheet acquired from Harris Semiconductor
SCHS243
CD74AC191,
CD74ACT191
Presettable Synchronous 4-Bit Binary
Up/Down Counter
Features
• Buffered Inputs
• Typical Propagation Delay
- 12.8ns at VCC = 5V, TA = 25
oC, C
L = 50pF
• Exceeds 2kV ESD Protection MIL-STD-883, Method
3015
• SCR-Latchup-Resistant CMOS Process and Circuit
Design
• Speed of Bipolar FAST™/AS/S with Significantly
Reduced Power Consumption
• Balanced Propagation Delays
• AC Types Feature 1.5V to 5.5V Operation and
Balanced Noise Immunity at 30% of the Supply
±24mA Output Drive Current
- Fanout to 15 FAST™ ICs
- Drives 50
Ω Transmission Lines
Description
The CD74AC191 and CD74ACT191 are asynchronously
presettable binary up/down synchronous counters that utilize
the Harris Advanced CMOS Logic technology. Presetting the
counter to the number on preset data inputs (P0-P3) is
accomplished by setting LOW the asynchronous parallel
load input (PL). Counting occurs when PL is HIGH, Count
Enable (CE) is LOW, and the Up/Down (U/D) input is either
LOW for up-counting or HIGH for down-counting. The
counter is incremented or decremented synchronously with
the LOW-to-HIGH transition of the clock.
When an overflow or underflow of the counter occurs, the
Terminal Count (TC) output, which is LOW during counting,
goes HIGH and remains HIGH for one clock cycle. This out-
put can be used for look-ahead carry in high-speed cascad-
ing (see Figure 12). The TC output also initiates the Ripple
Clock (RC) output which, normally HIGH, goes LOW and
remains LOW for the low-level cascaded using the Ripple
Count output.
Pinout
CD74AC191, CD74ACT191
(PDIP, SOIC)
TOP VIEW
Ordering Information
PART
NUMBER
TEMP.
RANGE (oC)
PACKAGE
PKG.
NO.
CD74AC191E
0 to 70oC, -40 to 85,
-55 to 125
16 Ld PDIP
E16.3
CD74ACT191E
0 to 70oC, -40 to 85,
-55 to 125
16 Ld PDIP
E16.3
CD74AC191M
0 to 70oC, -40 to 85,
-55 to 125
16 Ld SOIC
M16.15
CD74ACT191M
0 to 70oC, -40 to 85,
-55 to 125
16 Ld SOIC
M16.15
NOTES:
1. When ordering, use the entire part number. Add the suffix 96 to
obtain the variant in the tape and reel.
2. Wafer and die for this part number is available which meets all elec-
trical specifications. Please contact your local sales office or Harris
customer service for ordering information.
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
P1
Q1
Q0
CE
U/D
Q2
GND
Q3
VCC
CP
RC
TC
PL
P2
P3
P0
October 1998
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
FAST™ is a Trademark of Fairchild Semiconductor.
Copyright
© Harris Corporation 1998
File Number
1911.1
OBSOLETE
PRODUCT
No Recommended
Replacement


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