DS1497 datasheet(1/19 Pages) DALLAS

Part #	DS1497

Description	RAMified Real Time Clock

PDF	19 Pages

Scroll/Zoom	100%

Manufacturer	DALLAS [Dallas Semiconductor]

Direct Link	https://www.maximintegrated.com/en.html

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1 / 19 page

DS1495/DS1497

RAMified Real Time Clock

DS1495/DS1497

patents and other intellectual property rights, please refer to

Dallas Semiconductor databooks.

DD

BAT

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A2

A3

V

SQW

A4

A5

V

B

GND

SS

DD

V

1

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A0

A1

NC

D0

D1

D2

D3

D4

D5

D6

D7

A2

A3

V

SQW

A4

A5

NC

1

2

3

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5

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SS

DD

BAT

A0

A1

X2

X1

D0

D1

D2

D3

D4

D5

D6

D7

V

A2

A3

V

SQW

A4

A5

V

BGND

SS

A0

A1

X2

X1

D0

D1

D2

D3

D4

D5

D6

D7

V

STBY

IRQ

RESET

RD

WR

RTC

XRAM

STBY

IRQ

RESET

RD

WR

XRAM

RTC

STBY

IRQ

RESET

RD

WR

XRAM

RTC

DS1495S 28-Pin SOIC (330 mil)

DS1495 28-Pin DIP (600 mil)

DS1497 28-Pin Encapsulated Package (720 mil)

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020894 1/19

FEATURES

• Ideal for EISA bus PCs

• Functionally compatible with MC146818 in 32 KHz

mode

• Totally nonvolatile with over 10 years of operation in

the absence of power

• Self-contained subsystem includes lithium, quartz,

and support circuitry

• Counts seconds, minutes, hours, day of the week,

date, month, and year with leap year compensation

• Binary or BCD representations of time, calendar, and

alarm

• 12- or 24-hour clock with AM and PM in 12-hour mode

• Daylight Savings Time option

• Interfacedwith software as 64 register/RAM locations

plus 8K x 8 of static RAM

– 14 bytes of clock and control registers

– 50 bytes of general and control registers

– Separate 8K x 8 nonvolatile SRAM

• Programmable square wave output signal

• Bus-compatible interrupt signals (IRQ)

• Three interrupts are separately software-maskable

and testable:

– Time-of-day alarm once/second to once/day

– Periodic rates from 122

µs to 500 ms

– End-of-clock update cycle

• 28-pin JEDEC footprint

• Available as chip (DS1495/DS1495S) or stand alone

module with embedded lithium battery and crystal

(DS1497)

ORDERING INFORMATION

DS1495

RTC Chip; 28–pin DIP

DS1495S

RTC Chip; 28–pin SOIC

DS1497

RTC Module; 28–pin DIP

PIN ASSIGNMENT

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