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參數(shù)資料
| 型號(hào)： | DM74AS169A |
| 廠商： | Fairchild Semiconductor Corporation |
| 元件分類： | 通用總線功能 |
| 英文描述： | Synchronous 4-Bit Binary Up/Down Counter(同步4位二進(jìn)制加/減計(jì)數(shù)器) |
| 中文描述： | 同步4位二進(jìn)制加/減計(jì)數(shù)器（同步4位二進(jìn)制加/減計(jì)數(shù)器） |
| 文件頁數(shù)： | 1/6頁 |
| 文件大?。?/td> | 61K |
| 代理商： | DM74AS169A |
2000 Fairchild Semiconductor Corporation
DS006292
www.fairchildsemi.com
April 1984
Revised March 2000
D
DM74AS169A
Synchronous 4-Bit Binary Up/Down Counter
General Description
These synchronous presettable counters feature an inter-
nal carry look ahead for cascading in high speed counting
applications. The DM74AS169 is a 4-bit binary up/down
counter. The carry output is decoded to prevent spikes dur-
ing normal mode of counting operation. Synchronous oper-
ation is provided so that outputs change coincident with
each other when so instructed by count enable inputs and
internal gating. This mode of operation eliminates the out-
put counting spikes which are normally associated with
asynchronous (ripple clock) counters. A buffered clock
input triggers the four flip-flops on the rising (positive going)
edge of clock input waveform.
These counters are fully programmable; that is, the outputs
may each be preset either HIGH or LOW. The load input
circuitry allows loading with carry-enable output of cas-
caded counters. As loading is synchronous, setting up a
LOW level at the load input disables the counter and
causes the outputs to agree with the data inputs after the
next clock pulse.
The carry look-ahead circuitry permits cascading counters
for n-bit synchronous applications without additional gating.
Both count enable inputs (P and T) must be LOW to count.
The direction of the count is determined by the level of the
up/down input. When the input is HIGH, the counter counts
UP; when LOW, it counts DOWN. Input T is fed forward to
enable the carry outputs. The carry output thus enabled will
produce a LOW level output pulse with a duration approxi-
mately equal to the HIGH portion of the QA output when
counting UP, and approximately equal to the LOW portion
of the QA output when counting DOWN. This LOW level
overflow carry pulse can be used to enable successively
cascaded stages. Transitions at the enable P or T inputs
are allowed regardless of the level of the clock input.
The control functions for these counters are fully synchro-
nous. Changes at control inputs (enable P, enable T, load,
up/down) which modify the operating mode have no effect
until clocking occurs. The function of the counter (whether
enabled, disabled, loading or counting) will be dictated
solely by the conditions meeting the stable setup and hold
times.
Features
I
Switching Specifications at 50 pF
I
Switching Specifications guaranteed over full tempera-
ture and V
CC
range
I
Advanced oxide-isolated, ion-implanted Schottky TTL
process
I
Functionally and pin-for-pin compatible with Schottky
and low power Schottky TTL counterpart
I
Improved AC performance over Schottky and low power
Schottky counterparts
I
Synchronously programmable
I
Internal look ahead for fast counting
I
Carry output for n-bit cascading
I
Synchronous counting
I
Load control line
I
ESD inputs
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Order Number
DM74AS169AM
DM74AS169AN
Package Number
M16A
N16E
Package Description
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DM74AS169AN | Synchronous 4-Bit Binary Up/Down Counter |
| DM74AS169AMX | Synchronous Up/Down Counter |
| DM74AS1804WMX | Hex 2-input NAND Gate |
| DM74AS1804 | Hex 2-Input NAND Driver(六2輸入與非門驅(qū)動(dòng)器) |
| DM74AS1804N | Hex 2-Input NAND Driver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DM74AS169AM | 功能描述:計(jì)數(shù)器移位寄存器 Syn 4-Bit Binary Ctr RoHS:否 制造商:Texas Instruments 計(jì)數(shù)器類型: 計(jì)數(shù)順序:Serial to Serial/Parallel 電路數(shù)量:1 封裝 / 箱體:SOIC-20 Wide 邏輯系列: 邏輯類型: 輸入線路數(shù)量:1 輸出類型:Open Drain 傳播延遲時(shí)間:650 ns 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝:Reel |
| DM74AS169AMX | 功能描述:計(jì)數(shù)器移位寄存器 Syn 4-Bit Binary Ctr RoHS:否 制造商:Texas Instruments 計(jì)數(shù)器類型: 計(jì)數(shù)順序:Serial to Serial/Parallel 電路數(shù)量:1 封裝 / 箱體:SOIC-20 Wide 邏輯系列: 邏輯類型: 輸入線路數(shù)量:1 輸出類型:Open Drain 傳播延遲時(shí)間:650 ns 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝:Reel |
| DM74AS169AN | 功能描述:計(jì)數(shù)器 IC Syn 4-Bit Binary Ctr RoHS:否 制造商:NXP Semiconductors 計(jì)數(shù)器類型:Binary Counters 邏輯系列:74LV 位數(shù):10 計(jì)數(shù)法: 計(jì)數(shù)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 |
| DM74AS1804N | 功能描述:邏輯門 Hex 2-Input NAND Drv 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 |
| DM74AS1804WM | 制造商:Texas Instruments 功能描述: |
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