DS1315 데이터 시트보기 (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS1315

Phantom Time Chip

Dallas Semiconductor -> Maxim Integrated 

www.dalsemi.com

www.maxim-ic.com

DESCRIPTION

The DS1315 Phantom Time Chip is a

combination of a CMOS timekeeper and a

nonvolatile memory controller. In the absence of

power, an external battery maintains the

timekeeping operation and provides power for a

CMOS static RAM. The watch keeps track of

hundredths of seconds, seconds, minutes, hours,

day, date, month, and year information. The last

day of the month is automatically adjusted for

months with less than 31 days, including leap

year correction. The watch operates in one of two

formats: a 12-hour mode with an AM/PM

indicator or a 24-hour mode. The nonvolatile

controller supplies all the necessary support

circuitry to convert a CMOS RAM to a

nonvolatile memory. The DS1315 can be

interfaced with either RAM or ROM without

leaving gaps in memory.

PIN CONFIGURATIONS

X1 1

X2 2

WE 3

BAT1 4

GND 5

D6

Q7

GND 8

16

VCC1

15

VCC0

14 BAT2

13 RST

12 OE

11 CEI

10 CEO

9 ROM/RAM

16-Pin DIP (300-mil)

Pin Configurations continued at end of data sheet.

DS1315

Phantom Time Chip

FEATURES

§ Real time clock keeps track of hundredths of

seconds, seconds, minutes, hours, days, date

of the month, months, and years

§ Adjusts for months with fewer than 31 days

§ Automatic leap year correction valid up to

2100

§ No address space required to communicate

with RTC

§ Provides nonvolatile controller functions for

battery backup of SRAM

§ Supports redundant battery attachment for

high–reliability applications

§ Full ±10% VCC operating range

§ +3.3 volt or +5 volt operation

§ Industrial (–45°C to +85°C) operating

temperature ranges available

§ Drop in replacement for DS1215

PIN DESCRIPTION

X1, X2

- 32.768 kHz Crystal Connection

WE

BAT1

GND

D

Q

ROM/ RAM

- Write Enable

- Battery 1 Input

- Ground

- Data Input

- Data Output

- ROM/RAM Mode Select

CEO

- Chip Enable Output

CEI

- Chip Enable Input

OE

- Output Enable

RST

BAT2

VCC0

VCC1

- Reset

- Battery 2 Input

- Switched Supply Output

- Power Supply Input

Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device

may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.

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REV: 040203

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