PDF DS1243Y Data sheet ( Hoja de datos )

Número de pieza	DS1243Y
Descripción	64K NV SRAM with Phantom Clock
Fabricantes	Dallas Semiconducotr
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No Preview Available ! www.dalsemi.com DS1243Y 64K NV SRAM with Phantom Clock 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 28–pin 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 ORDERING INFORMATION DS1243Y–XXX –120 120 ns access –150 150 ns access DS1243Y 200 ns access PIN ASSIGNMENT RST A12 A7 A6 A5 A4 A3 A2 A1 A0 DQ0 DQ1 1 2 3 4 5 6 7 8 9 10 11 12 28 VCC 27 WE 26 NC 25 A8 24 A9 23 A11 22 OE 21 A10 20 CE 19 DQ7 18 DQ6 17 DQ5 DQ2 13 16 DQ4 GND 14 15 DQ3 28-Pin Encapsulated Package 720-Mil Extended PIN DESCRIPTION A0–A12 – Address Inputs CE GND DQ0–DQ7 VCC – Chip Enable – Ground – Data In/Data Out – Power (+5V) WE – Write Enable OE – Output Enable NC – No Connect RST – Reset DESCRIPTION The DS1243Y 64K NV SRAM with Phantom Clock is a fully static nonvolatile RAM (organized as 8192 words by 8 bits) with a built–in real time clock. The DS1243Y has a self–contained lithium energy source and control circuitry which constantly monitors VCC for an out–of–tolerance 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. 1 of 13 080299 1 page PHANTOM CLOCK REGISTER DEFINITION Figure 2 DS1243Y AM–PM/12/24 MODE Bit 7 of the hours register is defined as the 12– or 24–hour mode select bit. When high, the 12–hour mode is selected. In the 12–hour mode, bit 5 is the AM/PM bit with logic high being PM. In the 24–hour mode, bit 5 is the second 10–hour bit (20–23 hours). OSCILLATOR AND RESET BITS Bits 4 and 5 of the day register are used to control the RESET and oscillator functions. Bit 4 controls the RESET (pin 1). When the RESET bit is set to logic 1, the RESET input pin is ignored. When the RESET bit is set to logic 0, a low input on the RESET pin will cause the Phantom Clock to abort data transfer without changing data in the watch registers. Bit 5 controls the oscillator. When set to logic 1, the oscillator is off. When set to logic 0, the oscillator turns on and the watch becomes operational. These bits are shipped from the factory set to a logic 1. ZERO BITS Registers 1, 2, 3, 4, 5, and 6 contain one or more bits which will always read logic 0. When writing these locations, either a logic 1 or 0 is acceptable. 5 of 13 5 Page WRITE CYCLE TO PHANTOM CLOCK DS1243Y POWER-DOWN/POWER-UP CONDITION 11 of 13 11 Page

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