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參數(shù)資料
| 型號(hào)： | 74ACT11190 |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 通用總線功能 |
| 英文描述： | Synchronous 4-Bit Up/Down Decade Counters(4位同步十進(jìn)制計(jì)數(shù)器) |
| 中文描述： | 同步4位向上/向下計(jì)數(shù)器十年（4位同步十進(jìn)制計(jì)數(shù)器） |
| 文件頁(yè)數(shù)： | 2/9頁(yè) |
| 文件大小： | 167K |
| 代理商： | 74ACT11190 |
54ACT11190, 74ACT11190
SYNCHRONOUS 4-BIT UP/DOWN DECADE COUNTERS
SCAS383 – MARCH 1990
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
2
description (continued)
These counters are fully programmable; that is, it may be preset to any number between 0 and 9 by placing a
low on the load input and entering the desired data at the data inputs. The outputs change to agree with the
data inputs independently of the level of the clock input. This feature allows the counter to be used as modulo-N
dividers by modifying the count length with the preset inputs.
Two outputs have been made available to perform the cascading function: RCO and MAX/MIN count. The latter
output produces a high-level output pulse with a duration approximately equal to one complete cycle of the clock
while the count is zero (all outputs low) counting down or maximum (9) counting up. The (RCO) produces a
low-level output pulse under those same conditions but only while the clock input is low. The counter can be
cascaded by feeding the ripple-clock output to the enable input of the succeeding counter if parallel clocking
is used, or to the clock input if parallel enabling is used. The MAX/MIN count output can be used to accomplish
look-ahead for high-speed operation.
The 54ACT11190 is characterized for operation over the full military temperature range of – 55
°
C to 125
°
C. The
74ACT11190 is characterized for operation from – 40
°
C to 85
°
C.
P
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