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參數資料
| 型號： | DM74ALS169 |
| 廠商： | Fairchild Semiconductor Corporation |
| 元件分類： | 通用總線功能 |
| 英文描述： | Synchronous Four-Bit Up/Down Counters |
| 中文描述： | 同步4位向上/向下計數器 |
| 文件頁數： | 1/7頁 |
| 文件大小： | 69K |
| 代理商： | DM74ALS169 |
2000 Fairchild Semiconductor Corporation
DS006207
www.fairchildsemi.com
April 1984
Revised April 2000
D
DM74ALS169B
Synchronous Four-Bit Up/Down Counters
General Description
These synchronous presettable counters feature an inter-
nal carry look ahead for cascading in high speed counting
applications. The DM74ALS169B is a four-bit binary up/
down counter. The carry output is decoded to prevent
spikes during normal mode of counting operation. Synchro-
nous operation is provided so that outputs change coinci-
dent with each other when so instructed by count enable
inputs and internal gating. This mode of operation elimi-
nates the output counting spikes which are normally asso-
ciated 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 Q
A
output when
counting UP, and approximately equal to the low portion of
the Q
A
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
ESD inputs
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Order Number
DM74ALS169BM
DM74ALS169BN
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PDF資料 |
PDF描述 |
|---|---|
| DM74ALS169B | Dual Positive-Edge-Triggered D-Type Flip-Flops With Clear And Preset 14-VQFN -40 to 85 |
| DM74ALS169BMX | Synchronous Up/Down Counter |
| DM74ALS174 | Dual Positive-Edge-Triggered D-Type Flip-Flops With Clear And Preset 14-VQFN -40 to 85 |
| DM74ALS174M | Hex/Quad D-Type Flip-Flops with Clear |
| DM74ALS174N | Hex/Quad D-Type Flip-Flops with Clear |
相關代理商/技術參數 |
參數描述 |
|---|---|
| DM74ALS169B | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Synchronous Four-Bit Up/Down Counters |
| DM74ALS169BJ/A+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Synchronous Up/Down Counter |
| DM74ALS169BM | 功能描述:計數器 IC Syn 4-Bit Counter 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 |
| DM74ALS169BM/A+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Synchronous Up/Down Counter |
| DM74ALS169BM/B+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Synchronous Up/Down Counter |
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