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參數資料
| 型號： | SN74ALS561ADWG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 計數器 |
| 英文描述： | ALS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP BINARY COUNTER, PDSO20 |
| 封裝： | GREEN, PLASTIC, SOIC-20 |
| 文件頁數： | 1/15頁 |
| 文件大小： | 559K |
| 代理商： | SN74ALS561ADWG4 |
SN54ALS561A, SN74ALS561A
SYNCHRONOUS 4-BIT COUNTERS
WITH 3-STATE OUTPUTS
SDAS225A – DECEMBER 1982 – REVISED JANUARY 1995
Copyright
1995, Texas Instruments Incorporated
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Carry Output for n-Bit Cascading
Buffer-Type Outputs Drive Bus Lines
Directly
Choice of Asynchronous or Synchronous
Clearing and Loading
Internal Look-Ahead Circuitry for Fast
Cascading
Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK), and Standard Plastic (N)
and Ceramic (J) 300-mil DIPs
description
These binary counters are programmable and
offer synchronous and asynchronous clearing as
well as synchronous and asynchronous loading.
All synchronous functions are executed on the
positive-going edge of the clock.
The clear function is initiated by applying a low
level to either asynchronous clear (ACLR) or
synchronous clear (SCLR). ACLR (direct clear)
overrides all other functions of the device, while
SCLR overrides only the other synchronous
functions. Data is loaded from the A, B, C, and D
inputs by applying a low level to asynchronous
load (ALOAD) or by the combination of a low level
at
synchronous
load
(SLOAD)
and
a
positive-going clock transition. The counting
function is enabled only when enable P (ENP),
enable T (ENT), ACLR, ALOAD, SCLR, and
SLOAD are all high.
A high level at the output-enable (OE) input forces the Q outputs into the high-impedance state, and a low level
enables those outputs. Counting is independent of OE. ENT is fed forward to enable the ripple-carry output
(RCO) to produce a high-level pulse while the count is maximum (15). The clocked carry output (CCO) produces
a high-level pulse for a duration equal to that of the low level of the clock when RCO is high and the counter is
enabled (ENP and ENT are high); otherwise, CCO is low. CCO does not have the glitches commonly associated
with a ripple-carry output. Cascading is normally accomplished by connecting RCO or CCO of the first counter
to ENT of the next counter. However, for very high-speed counting, RCO should be used for cascading because
CCO does not become active until the clock returns to the low level.
The SN54ALS561A is characterized for operation over the full military temperature range of – 55
°C to 125°C.
The SN74ALS561A is characterized for operation from 0
°C to 70°C.
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
ALOAD
CLK
A
B
C
D
ENP
ACLR
SCLR
GND
VCC
RCO
CCO
OE
QA
QB
QC
QD
ENT
SLOAD
SN54ALS561A ...J PACKAGE
SN74ALS561A . . . DW OR N PACKAGE
(TOP VIEW)
3
2120 19
910 11 12 13
4
5
6
7
8
18
17
16
15
14
CCO
OE
QA
QB
QC
B
C
D
ENP
ACLR
A
CLK
ALOAD
ENT
Q
RCO
SCLR
GND
SLOAD
V
CC
SN54ALS561A . . . FK PACKAGE
(TOP VIEW)
D
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.
相關PDF資料 |
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| SN74ALS563BDWRG4 | ALS SERIES, 8-BIT DRIVER, INVERTED OUTPUT, PDSO20 |
| SN74ALS563BNSRG4 | ALS SERIES, 8-BIT DRIVER, INVERTED OUTPUT, PDSO20 |
| SNJ54ALS563BJ | ALS SERIES, 8-BIT DRIVER, INVERTED OUTPUT, CDIP20 |
| SN74ALS563BDWR | ALS SERIES, 8-BIT DRIVER, INVERTED OUTPUT, PDSO20 |
| SN74ALS564BDWRG4 | ALS SERIES, 8-BIT DRIVER, INVERTED OUTPUT, PDSO20 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| SN74ALS561ADWR | 功能描述:計數器 IC Sync 4-Bit Binary Counter W/3-St Otpt RoHS:否 制造商:NXP Semiconductors 計數器類型:Binary Counters 邏輯系列:74LV 位數:10 計數法: 計數順序: 工作電源電壓:1 V to 5.5 V 工作溫度范圍:- 40 C to + 125 C 封裝 / 箱體:SOT-109 封裝:Reel |
| SN74ALS561ADWRE4 | 功能描述:計數器 IC Sync 4-Bit Binary Counter W/3-St Otpt RoHS:否 制造商:NXP Semiconductors 計數器類型:Binary Counters 邏輯系列:74LV 位數:10 計數法: 計數順序: 工作電源電壓:1 V to 5.5 V 工作溫度范圍:- 40 C to + 125 C 封裝 / 箱體:SOT-109 封裝:Reel |
| SN74ALS561ADWRG4 | 功能描述:計數器 IC Synch 4B Binary Counters RoHS:否 制造商:NXP Semiconductors 計數器類型:Binary Counters 邏輯系列:74LV 位數:10 計數法: 計數順序: 工作電源電壓:1 V to 5.5 V 工作溫度范圍:- 40 C to + 125 C 封裝 / 箱體:SOT-109 封裝:Reel |
| SN74ALS561AN | 功能描述:計數器 IC Sync 4-Bit Binary Counter W/3-St Otpt RoHS:否 制造商:NXP Semiconductors 計數器類型:Binary Counters 邏輯系列:74LV 位數:10 計數法: 計數順序: 工作電源電壓:1 V to 5.5 V 工作溫度范圍:- 40 C to + 125 C 封裝 / 箱體:SOT-109 封裝:Reel |
| SN74ALS561ANE4 | 功能描述:計數器 IC Sync 4-Bit Binary Counter W/3-St Otpt RoHS:否 制造商:NXP Semiconductors 計數器類型:Binary Counters 邏輯系列:74LV 位數:10 計數法: 計數順序: 工作電源電壓:1 V to 5.5 V 工作溫度范圍:- 40 C to + 125 C 封裝 / 箱體:SOT-109 封裝:Reel |
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