Datasheet > X1241V8-2.7A

X1241V8-2.7A

更新时间： 2024-01-07 14:29:46

品牌	Logo	应用领域
瑞萨 - RENESAS		光电二极管
页数	文件大小	规格书
22页	195K
描述
Real Time Clock, Volatile, 0 Timer(s), CMOS, PDSO8, PLASTIC, TSSOP-8

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X1241V8-2.7A 数据手册

Preliminary Information

16K

2-Wire^™RTC

X1241

Real Time Clock/Calendar/CPU Supervisor with EEPROM

FEATURES

DESCRIPTION

• Programmable low voltage reset

• Selectable watchdog timer (1.75s, 750ms,

250ms, off)

The X1241 is a Real Time Clock with clock/calendar

circuits and a selectable watchdog timer. The dual port

clock register allows the clock to operate, without loss

of accuracy, even during read and write operations.

• 2-wire interface interoperable with I²C

—400kHz data transfer rate

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,

automatic adjustment for the year 2000 and months

with less than 31 days.

• Secondary power supply input with internal

switch-over circuitry

• 2Kbytes of EEPROM

—64-byte page write mode

—3-bit block lock

• Low power CMOS

—<1µA operating current

—<3mA active current during program

—<400µA active current during data read

• Single byte write capability

• Typical nonvolatile write cycle time: 5ms

• High reliability

The device offers a backup power input pin. This

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

BACK

rechargeable battery. The RTC is fully operational from

1.8 to 5.5 volts.

The X1241 provides a 2Kbyte EEPROM array, giving a

safe, secure memory for critical user and conﬁguration

data. This memory is unaffected by complete failure of

the main and backup supplies.

• 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)

Control

Decode

Logic

Status

(SRAM)

SCL

SDA

Serial

Interface

Decoder

16Kbit

EEPROM

Array

Watchdog

Timer

Low Voltage

Reset

RESET

Characteristics subject to change without notice. 1 of 22

REV 1.1.3 2/13/01

www.xicor.com

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