Datasheet > X1243

X1243

更新时间： 2022-11-27 07:37:05

品牌	Logo	应用领域
英特矽尔 - INTERSIL		闹钟可编程只读存储器电动程控只读存储器电可擦编程只读存储器时钟
页数	文件大小	规格书
17页	293K
描述
Real Time Clock/Calendar/Alarm with EEPROM

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X1243 数据手册

X1243

16K (2K x 8), 2-Wire RTC

Data Sheet

April 28, 2005

FN8249.0

PRELIMINARY

Real Time Clock/Calendar/Alarm with

EEPROM

Description

The X1243 is a Real Time Clock with clock/calendar circuits

and two alarms. The dual port clock and alarm registers

allow the clock to operate, without loss of accuracy, even

during read and write operations.

Features

• 2 alarms—interrupt output

- Settable on the second, 10s of seconds, minute, 10s of

The clock/calendar provides functionality that is con-trollable

and readable through a set of registers. The clock, using a

low cost 32.768kHz crystal input, accu-rately tracks the time

in seconds, minutes, hours, date, day, month and years. It

has leap year correction and automatic adjustment for

months with less than 31 days.

minutes, hour, day, month, or day of the week

- Repeat alarm for time base generation

• 2-wire interface interoperable with I²C

- 400kHz data transfer rate

• Secondary power supply input with internal switch-over

circuitry

An alarm match of the RTC sets an interrupt ag and

activates an interrupt pin. An alternative alarm function

provides a pulsed interrupt for long time constant time-

bases.

• 2Kbytes of EEPROM

- 64-byte page write mode

- 3-bit Block Lock™ protection

The device offers a backup power input pin. This V_BACKpin

allows the device to be backed up by a non-rechargeable

battery. The RTC is fully operational from 1.8 to 5.5 volts.

• Low power CMOS

- <1µA operating current

- <3mA active current during program

- <400µA active current during data read

The X1243 provides a 2Kbyte EEPROM array, giving a safe,

secure memory for critical user and conguration data. This

memory is unaffected by complete failure of the main and

backup supplies.

• Single byte write capability

• Typical nonvolatile write cycle time: 5ms

• High reliability

• Small package options

- 8-lead SOIC package, 8-lead TSSOP package

Block Diagram

Timer

Calendar

Logic

Frequency

Divider

1Hz

32.768kHz

Oscillator

Time

Keeping

Registers

(SRAM)

Control

Registers

(EEPROM)

Status

(SRAM)

Control

Decode

Logic

Compare

Alarm

Serial

Interface

Decoder

SCL

SDA

Alarm Regs

(EEPROM)

16k (2k x 8)

EEPROM

Array

Interrupt Enable

Alarm

IRQ

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

1-888-INTERSIL or 1-888-352-6832 | Intersil (and design) is a registered trademark of Intersil Americas Inc.

All other trademarks mentioned are the property of their respective owners.

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