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參數(shù)資料
| 型號(hào)： | 933406850652 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 計(jì)數(shù)器 |
| 英文描述： | 4000/14000/40000 SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT DOWN BINARY COUNTER, PDSO16 |
| 封裝： | PLASTIC, SOT-109-1, SO-16 |
| 文件頁(yè)數(shù)： | 3/10頁(yè) |
| 文件大?。?/td> | 106K |
| 代理商： | 933406850652 |
January 1995
2
Philips Semiconductors
Product specication
Programmable 4-bit binary down counter
HEF4526B
MSI
DESCRIPTION
The HEF4526B is a synchronous programmable 4-bit
binary down counter with an active HIGH and an active
LOW clock input (CP0, CP1), an asynchronous parallel
load input (PL), four parallel inputs (P0 to P3), a cascade
feedback input (CF), four buffered parallel outputs (O0 to
O3), a terminal count output (TC) and an overriding
asynchronous master reset input (MR).
This device is a programmable, cascadable down counter
with a decoded TC output for divide-by-n applications. In
single stage applications the TC output is connected to PL.
CF allows cascade divide-by-n operation with no
additional gates required.
Information on P0 to P3 is loaded into the counter while PL
is HIGH, independent of all other input conditions except
MR, which must be LOW. When PL and CP1 are LOW, the
counter advances on a LOW to HIGH transition of CP0.
When PL is LOW and CP0 is HIGH, the counter advances
on a HIGH to LOW transition of CP1. TC is HIGH when the
counter is in the zero state (O0 =O1 =O2 =O3 = LOW)
and CF is HIGH and PL is LOW. A HIGH on MR resets the
counter (O0 to O3 = LOW) independent of other input
conditions.
Schmitt-trigger action in the clock input makes the circuit
highly tolerant to slower clock rise and fall times.
FAMILY DATA, IDD LIMITS category MSI
See Family Specifications
Fig.1 Functional diagram.
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