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參數(shù)資料
| 型號(hào)： | CD74ACT191E |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 通用總線功能 |
| 英文描述： | Presettable Synchronous 4-Bit Binary Up/Down Counter |
| 中文描述： | 可預(yù)置同步4位二進(jìn)制加/減計(jì)數(shù)器 |
| 文件頁(yè)數(shù)： | 1/10頁(yè) |
| 文件大?。?/td> | 51K |
| 代理商： | CD74ACT191E |
1
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 V
CC
= 5V, T
A
= 25
o
C, 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
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 (
o
C)
0 to 70
o
C, -40 to 85,
-55 to 125
0 to 70
o
C, -40 to 85,
-55 to 125
0 to 70
o
C, -40 to 85,
-55 to 125
0 to 70
o
C, -40 to 85,
-55 to 125
PACKAGE
PKG.
NO.
CD74AC191E
16 Ld PDIP
E16.3
CD74ACT191E
16 Ld PDIP
E16.3
CD74AC191M
16 Ld SOIC
M16.15
CD74ACT191M
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
V
CC
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
NoOBSOLETE PRODUCT
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CD74ACT191M | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Presettable Synchronous 4-Bit Binary Up/Down Counter |
| CD74ACT191M WAF | 制造商:Harris Corporation 功能描述: 制造商:Texas Instruments 功能描述: |
| CD74ACT2 | 制造商:Harris Corporation 功能描述: |
| CD74ACT20 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Dual 4-Input NAND Gate |
| CD74ACT20E | 功能描述:邏輯門(mén) Dual 4-Input RoHS:否 制造商:Texas Instruments 產(chǎn)品:OR 邏輯系列:LVC 柵極數(shù)量:2 線路數(shù)量（輸入/輸出）:2 / 1 高電平輸出電流:- 16 mA 低電平輸出電流:16 mA 傳播延遲時(shí)間:3.8 ns 電源電壓-最大:5.5 V 電源電壓-最小:1.65 V 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DCU-8 封裝:Reel |
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