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DS1244YP-70 Datasheet(PDF) 2 Page - Dallas Semiconductor |
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DS1244YP-70 Datasheet(HTML) 2 Page - Dallas Semiconductor |
2 / 19 page DS1244/DS1244P 2 of 19 PIN DESCRIPTION A0–A14 - Address Inputs CE - Chip Enable OE - Output Enable WE - Write Enable VCC - Power-Supply Input GND - Ground DQ0–DQ7 - Data In/Data Out N.C. - No Connection X1, X2 - Crystal Connection VBAT - Battery Connection RST - Reset TYPICAL OPERATING CIRCUIT ORDERING INFORMATION PART PIN-PACKAGE TEMP RANGE TOP MARK DS1244Y-70 28-Module (740mil) 0°C to +70°C DS1244Y-70 DS1244YP-70 34-PowerCap* 0°C to +70°C DS1244YP-70 DS1244W-120 28-Module (740mil) 0°C to +70°C DS1244W-120 DS1244W-120IND 28-Module (740mil) -40°C to +85°C DS1244W-120IND DS1244WP-120 34-PowerCap* 0°C to +70°C DS1244WP-120 DS1244WP-120IND 34-PowerCap* -40°C to +85°C DS1244WP-120IND * DS9034PCX (PowerCap) Required. (Must be ordered separately.) DESCRIPTION The DS1244 256k NV SRAM with a Phantom clock is a fully static nonvolatile RAM (NV SRAM) (organized as 32k words by 8 bits) with a built-in real-time clock. The DS1244 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 garbled data in both the memory and real-time clock. The phantom clock provides timekeeping information for hundredths of seconds, seconds, minutes, hours, days, date, months, and years. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including correction for leap years. The phantom clock operates in either 24-hour or 12-hour format with an AM/PM indicator. PACKAGES The DS1244 is available in two packages: 28-pin DIP and 34-pin PowerCap module. The 28-pin DIP- style module integrates the crystal, lithium energy source, and silicon all in one package. The 34-pin PowerCap module board is designed with contacts for connection to a separate PowerCap (DS9034PCX) that contains the crystal and battery. This design allows the PowerCap to be mounted on top of the DS1244P after the completion of the surface mount process. Mounting the PowerCap after the surface mount process prevents damage to the crystal and battery due to the high temperatures required for solder reflow. The PowerCap is keyed to prevent reverse insertion. The PowerCap module board and PowerCap are ordered separately and shipped in separate containers. The part number for the Powercap is DS9034PCX. |
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