DS1243Y

Date Format :
Packaging :
Supply Voltage - Max : 5.5 V
Time Format : HH:MM:SS:hh
Function : Clock, Calendar, NV Timekeeping RAM
Supply Voltage - Min : 4.5 V
Mounting Style : Through Hole
Maximum Operating Temperature : + 70 C
Minimum Operating Temperature : 0 C
Package / Case : eDIP
RTC Memory Size : 8192 B
RTC Bus Interface : Phantom Clock, Parallel


Features:

` Real time clock keeps track of hundredths of seconds, seconds, minutes, hours, days, date of the month, months, and years
` 8K x 8 NV SRAM directly replaces volatile static RAM or EEPROM
` Embedded lithium energy cell maintains calendar operation and retains RAM data
` Watch function is transparent to RAM operation
` Month and year determine the number of days in each month; valid up to 2100
` Lithium energy source is electrically disconnected to retain freshness until power is applied for the first time
` Standard 28pin JEDEC pinout
` Full ±10% operating range
` Operating temperature range 0°C to 70°C
` Accuracy is better than ±1 minute/month @ 25°C
` Over 10 years of data retention in the absence of power
` Available in 120, 150 and 200 ns access time

Pinout




Specifications

Voltage on Any Pin Relative to Ground .................0.3V to +7.0V
Operating Temperature ............................................0°C to 70°C
Storage Temperature .........................................40°C to +70°C
Soldering Temperature .......260°C for 10 seconds (See Note 13)

This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.

Description

The DS1243Y 64K NV SRAM with Phantom Clock is a fully static nonvolatile RAM (organized as 8192 words by 8 bits) with a builtin real time clock. The DS1243Y has a selfcontained lithium energy source and control circuitry which constantly monitors VCC for an outoftolerance condition. When such a condition occurs, the lithium energy source is automatically switched on and write protection is unconditionally enabled to prevent corrupted data in both the memory and real time clock.

The Phantom Clock DS1244 provides timekeeping information including hundredths of seconds, seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with less than 31 days, including correction for leap years. The Phantom Clock operates in either 24hour or 12hour format with an AM/PM indicator.