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參數資料
| 型號： | DM74LS169A |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Quad Buffer with 3-STATE Outputs |
| 中文描述： | 同步4位向上/向下二進制計數器 |
| 文件頁數： | 1/8頁 |
| 文件大小： | 213K |
| 代理商： | DM74LS169A |
DM74LS169A
Synchronous 4-Bit Up/Down Binary Counter
General Description
This synchronous presettable counter features an internal
carry look-ahead for cascading in high-speed counting appli-
cations. Synchronous operation is provided by having all
flip-flops clocked simultaneously, so that the outputs all
change at the same time when so instructed by the
count-enable inputs and internal gating. This mode of opera-
tion helps eliminate the output counting spikes that are nor-
mally associated with asynchronous (ripple clock) counters.
Abuffered clock input triggers the four master-slave flip-flops
on the rising edge of the clock waveform.
This counter is fully programmable; that is, the outputs may
each be preset either high or low. The load input circuitry al-
lows loading with the carry-enable output of cascaded
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 approximately equal
to the high portion of the Q
output when counting up, and
approximately equal to the low portion of the Q
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. All inputs are diode clamped to minimize
transmission-line effects, thereby simplifying system design.
This counter features a fully independent clock circuit.
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 en-
abled, disabled, loading, or counting) will be dictated solely
by the conditions meeting the stable setup and hold times.
Features
n
Fully synchronous operation for counting and
programming.
n
Internal look-ahead for fast counting.
n
Carry output for n-bit cascading.
n
Fully independent clock circuit
Connection Diagram
Dual-In-Line Package
DS006401-1
Order Number 54LS169DMQB, 54LS169FMQB, 54LS169LMQB,
DM54LS169AJ, DM54LS169AW, DM74LS169AM or DM74LS169AN
See Package Number E20A, J16A, M16A, N16E or W16A
April 1998
D
1998 Fairchild Semiconductor Corporation
DS006401
www.fairchildsemi.com
相關PDF資料 |
PDF描述 |
|---|---|
| DM74LS169AM | Quad Buffer with 3-STATE Outputs; Package: SOIC; No of Pins: 14; Container: Tape & Reel |
| DM74LS169AN | Quad Buffer with 3-STATE Outputs; Package: SOP; No of Pins: 14; Container: Rail |
| DM74LS174 | 16-Bit Buffer/Line Driver with 3-STATE Outputs; Package: TSSOP; No of Pins: 48; Container: Rail |
| DM74LS174M | 16-Bit Buffer/Line Driver with 3-STATE Outputs; Package: TSSOP; No of Pins: 48; Container: Tape & Reel |
| DM74LS174N | 16-Bit Buffer/Line Driver with 3-STATE Outputs; Package: SSOP; No of Pins: 48; Container: Tape & Reel |
相關代理商/技術參數 |
參數描述 |
|---|---|
| DM74LS169A WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| DM74LS169AM | 功能描述:計數器 IC Syn 4-Bit Binary Ctr 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 |
| DM74LS169AMX | 功能描述:計數器 IC Syn 4-Bit Binary Ctr 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 |
| DM74LS169AN | 功能描述:計數器 IC Syn 4-Bit Binary Ctr 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 |
| DM74LS174 DIE | 制造商:Texas Instruments 功能描述: |
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