Datasheet > HEF4521B_09

HEF4521B_09

更新时间： 2024-11-16 10:45:03

品牌	Logo	应用领域
恩智浦 - NXP		振荡器
页数	文件大小	规格书
17页	107K
描述
24-stage frequency divider and oscillator

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HEF4521B_09 数据手册

HEF4521B

24-stage frequency divider and oscillator

Rev. 05 — 5 November 2009

Product data sheet

1. General 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 (A2 to Y2) will function as: a crystal oscillator, an input buffer for an

external oscillator or in combination with A1 as an RC oscillator. The crystal oscillator

operates in Low-power mode when pins V_SS1and V_DD1are supplied via external resistors.

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 (A2). The outputs from each of the last seven stages (2¹⁸to 2²⁴) are

available for additional ﬂexibility.

It operates over a recommended V_DDpower supply range of 3 V to 15 V referenced to V_SS

(usually ground). Unused inputs must be connected to V_DD, V_SS, or another input. It is

also suitable for use over the full industrial (−40 °C to +85 °C) temperature range.

2. Features

I Low power crystal oscillator operation

I Fully static operation

I 5 V, 10 V, and 15 V parametric ratings

I Standardized symmetrical output characteristics

I Operates across the full industrial temperature range −40 °C to +85 °C

I Complies with JEDEC standard JESD 13-B

3. Applications

I Industrial

4. Ordering information

Table 1.

Ordering information

All types operate from −40 °C to +85 °C.

Type number

Package

Name

Description

Version

HEF4521BP

HEF4521BT

DIP16

SO16

plastic dual in-line package; 16-leads (300 mil)

plastic small outline package; 16 leads; body width 3.9 mm

SOT38-4

SOT109-1

12 3 4 5 6 7...17

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