Datasheet > CDP1879E

CDP1879E

更新时间： 2024-02-14 16:45:54

品牌	Logo	应用领域
英特矽尔 - INTERSIL		时钟
页数	文件大小	规格书
18页	103K
描述
CMOS Real-Time Clock

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中文翻译

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技术参数
数据手册

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CDP1879E 技术参数

是否Rohs认证：	不符合	生命周期：	Transferred
包装说明：	DIP, DIP24,.6	Reach Compliance Code：	unknown
风险等级：	5.86	信息访问方法：	PARALLEL
中断能力：	Y	JESD-30 代码：	R-PDIP-T24
JESD-609代码：	e0	端子数量：	24
最高工作温度：	85 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	DIP
封装等效代码：	DIP24,.6	封装形状：	RECTANGULAR
封装形式：	IN-LINE	电源：	5/10 V
子类别：	Timer or RTC	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：	SECONDS	易失性：	YES
Base Number Matches：	1

CDP1879E 数据手册

CDP1879,

CDP1879C-1

CMOS Real-Time Clock

March 1997

Features

Description

The CDP1879 real-time clock supplies time and calendar information

from seconds to months in BCD format. It consists of 5 separately

addressable and programmable counters that divide down an oscillator

input. The clock input can have any one of 4 possible frequencies,

allowing ﬂexibility in the choice of crystal or external clock sources.

Using an external 32kHz clock source, timekeeping can be performed

down to 2.5V (see Standby (Timekeeping) Voltage Operation).

• CPU Interface for Use with General-Purpose

Microprocessors

• Time Of Day/Calendar

• Reads Seconds, Minutes, Hours

• Reads Day of Month and Month

• Alarm Circuit With Seconds, Minutes or Hours

Operation

The device can be memory-mapped for use with any general-purpose

microprocessor and has the additional capability of operating in the

CDP1800 series input/output mode.

• Power Down Mode

The real-time clock functions as a time-of-day/calendar with an alarm

capability that can be set for combinations of seconds, minutes or

hours. Alarm time is conﬁgured by loading alarm latches that activate

an interrupt output through a comparator when the counter and alarm

latch values are equal.

• Separate Clock Output Selects 1 of 15 Square Wave

Signals

• Interrupt Output Activated By Clock Output and/or

Alarm Circuit

Fifteen selectable square-wave signals are available as a separate

clock output signal and can also activate the interrupt output. A status

control register determines the operational characteristics of the device,

by selecting the prescaler divisor and the clock output, and controls the

load and alarm functions.

• Date Integrity Sampling for Clock Rollover Eliminated

• On-Board Oscillator:

- Crystal Operation CDP1879 at 10V. . . . . . . 4.19MHz,

2.09MHz or 1.048MHz

- Crystal Operation CDP1879C-1 at 5V . . . . . 4.19MHz,

2.09MHz or 1.048MHz or 32kHz

A transparent “freeze” circuit preclude clock rollover during counter and

latch access times to assure stable and accurate values in the counters

and alarm latches.

- External Clock Operation at 10V or 5V. . . . 4.19MHz,

2.09MHz, 1.048MHz or 32kHz

The CDP1879 is functionally identical to the CDP1879C-1. The

CDP1879 has a recommended operating voltage range of 4V to 10.5V,

and the CDP1879C-1 has a recommended operating voltage range of

4V to 6.5V. The CDP1879 and the CDP1879C-1 are supplied in 24 lead

hermetic dual-in-line side-brazed ceramic packages (D sufﬁx) and 24

lead dual-in-line plastic packages (E sufﬁx).

• Addressable in Memory Space or CDP1800 Series I/O

Mode

• Low Standby (Timekeeping) Voltage with External Clock

• Related Literature

- AN7275, Guide to the Use of CD1879 and

CDP1879C1 Real Time Clock

Ordering Information

TEMP

RANGE

PKG.

NO.

PACKAGE

10V

Pinout

PDIP

-40 C to

CDP1879CE1 CDP1879E

E24.6

+85 C

CDP1879, CDP1879C-1 (PDIP, SBDIP)

SBDIP

Burn-In

-40 C to

CDP1879CD1

D24.6

TOP VIEW

+85 C

CDP1879CD1X

INT

RESET

POWER DOWN

23 XTAL

CDP1879 Modes of Operation

22 XTAL

CLK

OPERATION

FUNCTION

OUT

Read

1. Seconds, minutes, hours, date and month counters

2. Status register to identify interrupt source

IO/MEM

TPB/WR

TPA

20 DB7

19 DB6

18 DB5

17 DB4

16 DB3

15 DB2

14 DB1

13 DB0

Write

1. Control register to set device operation

2. Seconds, minutes, hours, date and month counters

3. Alarm latches for alarm time

Power Down

Interrupt

1. Three-state interrupt output with active alarm or

clock out circuitry for wake-up control

2. Data bus and address inputs are “DON’T CARE”

A1 10

A0 11

1. Clock out as source

2. Alarm time as source

3. Either interrupt can occur during normal or power

down mode

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

File Number 1360.2

12 3 4 5 6 7...18

中文翻译

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与CDP1879E相关器件

型号	品牌	获取价格	描述	数据表
CDP1881C	INTERSIL	获取价格	CMOS 6-Bit Latch and Decoder Memory Interfaces
CDP1881CE	INTERSIL	获取价格	CMOS 6-Bit Latch and Decoder Memory Interfaces
CDP1881E	ETC	获取价格	Logic IC
CDP1881EX	RENESAS	获取价格	IC,ADDRESS DECODER,CMOS,DIP,20PIN,PLASTIC
CDP1882	INTERSIL	获取价格	CMOS 6-Bit Latch and Decoder Memory Interfaces
CDP1882C	INTERSIL	获取价格	CMOS 6-Bit Latch and Decoder Memory Interfaces
CDP1882CD	ETC	获取价格	Logic IC
CDP1882CE	INTERSIL	获取价格	CMOS 6-Bit Latch and Decoder Memory Interfaces
CDP1882CEX	INTERSIL	获取价格	CMOS 6-Bit Latch and Decoder Memory Interfaces
CDP1882D	INTERSIL	获取价格	CMOS 6-Bit Latch and Decoder Memory Interfaces

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