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參數資料
| 型號： | SN74ALS568ADWR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 計數器 |
| 英文描述： | ALS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL DECADE COUNTER, PDSO20 |
| 封裝： | PLASTIC, SO-20 |
| 文件頁數： | 1/15頁 |
| 文件大小： | 268K |
| 代理商： | SN74ALS568ADWR |
SN54ALS569A, SN74ALS568A, SN74ALS569A
SYNCHRONOUS 4-BIT UP/DOWN DECADE AND BINARY COUNTERS
WITH 3-STATE OUTPUTS
SDAS229A – APRIL 1982 – REVISED JANUARY 1995
Copyright
1995, Texas Instruments Incorporated
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
3-State Q Outputs Drive Bus Lines Directly
Counter Operation Independent of 3-State
Output
Fully Synchronous Clear, Count, and Load
Asynchronous Clear Is Also Provided
Fully Cascadable
Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK), and Standard Plastic (N)
and Ceramic (J) 300-mil DIPs
description
The
SN74ALS568A
decade
counter
and
′ALS569A binary counters are programmable,
count up or down, and offer both synchronous and
asynchronous clearing. All synchronous functions
are executed on the positive-going edge of the
clock (CLK) input.
The clear function is initiated by applying a low
level to either asynchronous clear (ACLR) or
synchronous clear (SCLR). Asynchronous (direct)
clearing overrides all other functions of the device,
while synchronous clearing overrides only the
other synchronous functions. Data is loaded from
the A, B, C, and D inputs by holding load (LOAD)
low during a positive-going clock transition. The
counting function is enabled only when enable P
(ENP) and enable T (ENT) are low and ACLR,
SCLR, and LOAD are high. The up/down (U/D)
input controls the direction of the count. These
counters count up when U/D is high and count
down when U/D is low.
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 low-level pulse while the count is zero (all Q outputs low) when counting down or maximum
(9 or 15) when counting up. The clocked carry output (CCO) produces a low-level pulse for a duration equal to
that of the low level of the clock when RCO is low and the counter is enabled (both ENP and ENT are low);
otherwise, CCO is high. 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 since CCO does not become active
until the clock returns to the low level.
The SN54ALS569A is characterized for operation over the full military temperature range of – 55
°C to 125°C.
The SN74ALS568A and SN74ALS569A are 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
U/D
CLK
A
B
C
D
ENP
ACLR
SCLR
GND
VCC
RCO
CCO
OE
QA
QB
QC
QD
ENT
LOAD
SN54ALS569A ...J PACKAGE
SN74ALS568A, SN74ALS569A . . . DW OR N PACKAGE
(TOP VIEW)
32 1 20 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
SN54ALS569A . . . FK PACKAGE
(TOP VIEW)
A
CLK
U/D
ENT
Q
RCO
SCLR
GND
LOAD
V
CC
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.
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| SN74ALS569ADWG4 | ALS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, PDSO20 |
| SN74ALS569ANSRG4 | ALS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL DECADE COUNTER, PDSO20 |
| SN74ALS575ADWRG4 | ALS SERIES, 8-BIT DRIVER, TRUE OUTPUT, PDSO24 |
| SN74ALS580BDWE4 | ALS SERIES, 8-BIT DRIVER, INVERTED OUTPUT, PDSO20 |
| SN74ALS621A-1NSRE4 | ALS SERIES, 8-BIT TRANSCEIVER, TRUE OUTPUT, PDSO20 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| SN74ALS568AN | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述: |
| SN74ALS569ADW | 功能描述:計數器移位寄存器 Sync 4-Bit Up/Down Bnry Cntr W/3St Otp RoHS:否 制造商:Texas Instruments 計數器類型: 計數順序:Serial to Serial/Parallel 電路數量:1 封裝 / 箱體:SOIC-20 Wide 邏輯系列: 邏輯類型: 輸入線路數量:1 輸出類型:Open Drain 傳播延遲時間:650 ns 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝:Reel |
| SN74ALS569ADWE4 | 功能描述:計數器 IC Sync 4-Bit Up/Down Bnry Cntr W/3St Otp 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 |
| SN74ALS569ADWG4 | 功能描述:計數器 IC Synch 4B Up Down 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 |
| SN74ALS569ADWR | 功能描述:計數器 IC Sync 4-Bit Up/Down Bnry Cntr W/3St Otp 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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