參數(shù)資料
型號: 933406770653
廠商: NXP SEMICONDUCTORS
元件分類: 計數(shù)器
英文描述: 4000/14000/40000 SERIES, ASYN NEGATIVE EDGE TRIGGERED 24-BIT UP BINARY COUNTER, PDSO16
封裝: PLASTIC, SOT-109-1, SO-16
文件頁數(shù): 4/11頁
文件大?。?/td> 156K
代理商: 933406770653
January 1995
2
Philips Semiconductors
Product specication
24-stage frequency divider and oscillator
HEF4521B
MSI
DESCRIPTION
The HEF4521B consists of a chain of 24 toggle flip-flops
with an overriding asynchronous master reset input (MR),
and an input circuit that allows three modes of operation.
The single inverting stage (I2/O2) will function as a crystal
oscillator, or in combination with I1 as an RC oscillator, or
as an input buffer for an external oscillator. Low-power
operation as a crystal oscillator is enabled by connecting
external resistors to pins 3 (VSS’) and 5 (VDD’).
Each flip-flop divides the frequency of the previous flip-flop
by two, consequently the HEF4521B will count up to
224 = 16777216. The counting advances on the HIGH to
LOW transition of the clock (I2). The outputs of the last
seven stages are available for additional flexibility.
FAMILY DATA, IDD LIMITS category MSI
See Family Specifications
Fig.1 Functional diagram.
相關(guān)PDF資料
PDF描述
933406750652 4000/14000/40000 SERIES, ASYN NEGATIVE EDGE TRIGGERED 24-BIT UP BINARY COUNTER, PDIP16
933406850652 4000/14000/40000 SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT DOWN BINARY COUNTER, PDSO16
933406960652 HEX 1-INPUT INVERT GATE, PDSO14
935270276112 HEX 1-INPUT INVERT GATE, PDSO14
935270276118 HEX 1-INPUT INVERT GATE, PDSO14
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