DP8571

更新时间： 2024-01-08 09:45:49

品牌	Logo	应用领域
美国国家半导体 - NSC		时钟
页数	文件大小	规格书
24页	362K
描述
Timer Clock Peripheral (TCP)

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DP8571 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
包装说明：	DIP, DIP24,.3	Reach Compliance Code：	unknown
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.89	Is Samacsys：	N
其他特性：	4 PROGRAMMABLE MODES FOR TIMER; PRESCALED XTAL OSC OUTPUT FOR TIMER; POWER FAIL I/P FOR BUS LOCK-OUT	外部数据总线宽度：	8
信息访问方法：	PARALLEL, DIRECT ADDRESS	中断能力：	Y
JESD-30 代码：	R-PDIP-T24	JESD-609代码：	e0
长度：	31.915 mm	位数：	16
端子数量：	24	计时器数量：	2
片上数据RAM宽度：	8	最高工作温度：	85 °C
最低工作温度：	-40 °C	最大输出时钟频率：	2.4576 MHz
封装主体材料：	PLASTIC/EPOXY	封装代码：	DIP
封装等效代码：	DIP24,.3	封装形状：	RECTANGULAR
封装形式：	IN-LINE	峰值回流温度（摄氏度）：	NOT SPECIFIED
电源：	3/5 V	认证状态：	Not Qualified
RAM（字数）：	44	座面最大高度：	5.08 mm
子类别：	Timer or RTC	最大压摆率：	20 mA
最大供电电压：	5.5 V	最小供电电压：	4.5 V
标称供电电压：	5 V	表面贴装：	NO
技术：	CMOS	温度等级：	INDUSTRIAL
端子面层：	Tin/Lead (Sn/Pb)	端子形式：	THROUGH-HOLE
端子节距：	2.54 mm	端子位置：	DUAL
最短时间：	1/100 SECOND	处于峰值回流温度下的最长时间：	NOT SPECIFIED
易失性：	YES	宽度：	7.62 mm
uPs/uCs/外围集成电路类型：	TIMER, REAL TIME CLOCK	Base Number Matches：	1

DP8571 数据手册

May 1993

DP8571A Timer Clock Peripheral (TCP)

General Description

The DP8571A is intended for use in microprocessor based

systems where information is required for multi-tasking, data

logging or general time of day/date information. This device

is implemented in low voltage silicon gate microCMOS tech-

nology to provide low standby power in battery back-up en-

vironments. The circuit’s architecture is such that it looks

like a contiguous block of memory or I/O ports. The address

space is organized as 2 software selectable pages of 32

bytes. This includes the Control Registers, the Clock Coun-

ters, the Alarm Compare RAM, the Timers and their data

RAM, and the Time Save RAM. Any of the RAM locations

that are not being used for their intended purpose may be

used as general purpose CMOS RAM.

interrupt, and lock out the mp interface. The time power fails

Additionally, two supply pins are provided. When

may be logged into RAM automatically when V

, internal circuitry will automatically switch from the

main supply to the battery supply. Status bits are provided

to indicate initial application of battery power, system power,

and low battery detect.

(Continued)

Features

Full function real time clock/calendar

Ð 12/24 hour mode timekeeping

Ð Day of week and day of years counters

Ð Four selectable oscillator frequencies

Ð Parallel resonant oscillator

Time and date are maintained from 1/100 of a second to

year and leap year in a BCD format, 12 or 24 hour modes.

Day of week, day of month and day of year counters are

provided. Time is controlled by an on-chip crystal oscillator

requiring only the addition of the crystal and two capacitors.

The choice of crystal frequency is program selectable.

Two 16-bit timers

Ð 10 MHz external clock frequency

Ð Programmable multi-function output

Ð Flexible re-trigger facilities

Power fail features

Two independent multifunction 10 MHz 16-bit timers are

provided. These timers operate in four modes. Each has its

own prescaler and can select any of 7 possible clock inputs.

Thus, by programming the input clocks and the timer coun-

ter values a very wide range of timing durations can be

achieved. The range is from about 400 ns (4.915 MHz oscil-

lator) to 65,535 seconds (18 hrs., 12 min.).

Ð Internal power supply switch to external battery

Ð Power Supply Bus glitch protection

Ð Automatic log of time into RAM at power failure

On-chip interrupt structure

Ð Periodic, alarm, timer and power fail interrupts

Up to 44 bytes of CMOS RAM

INTR/MFO pins programmable High/Low and push-pull

or open drain

Power failure logic and control functions have been integrat-

ed on chip. This logic is used by the TCP to issue a power fail

Block Diagram

TL/F/9979–1

FIGURE 1

TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.

1995 National Semiconductor Corporation

TL/F/9979

RRD-B30M75/Printed in U. S. A.

12 3 4 5 6 7...24

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与DP8571相关器件

型号	品牌	描述	获取价格	数据表
DP8571A	NSC	Timer Clock Peripheral (TCP)	获取价格
DP8571AN	NSC	Timer Clock Peripheral (TCP)	获取价格
DP8572A	NSC	Real Time Clock (RTC)	获取价格
DP8572AM	NSC	Real Time Clock (RTC)	获取价格
DP8572AMD/883	TI	0 TIMER(S), REAL TIME CLOCK, CDIP24, HERMETIC SEALED, DIP-24	获取价格
DP8572AMD/883	ROCHESTER	Real Time Clock, 0 Timer(s), CMOS, CDIP24, HERMETIC SEALED, DIP-24	获取价格

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