DS1251 - Dallas Semiconducotr

DS1251 4096k NV SRAM with Phantom Clock

A0–A18 CE OE WE P DS1251WP-XXXY (3.3V) - IND Industrial - 120 120ns access P blank 32-Pin DIP Module 34-Pin PowerCap Module board* VCC GND DQ0–DQ7 NC X1, X2 VBAT RST - Address Inputs - Chip Enable - Output Enable - Write Enable - Power Supply Input - Ground - Data In/Data Out - No Connection - Crystal Connection - Battery Connection - Reset *DS9034PCX (.

Features

§ § § § § § § § § § PIN ASSIGNMENT Real-time clock keeps track of hundredths of A18/RST VCC 32 1 seconds, minutes, hours, days, date of the A16 31 A15 2 A14 A17 30 3 month, months, and years 29 4 WE A12 512k x 8 NV SRAM directly replaces A13 A7 28 5 volatile static RAM or EEPROM A6 27 6 A8 A5 A9 Embedded lithium energy cell maintains 26 7 A11 A4 25 8 calendar operation and retains RAM data OE A3 24 9 Watch function is transparent to RAM A10 A2 23 10 operation CE A1 22 11 21 12 DQ7 A0 Month and year determine the number of 13 20 DQ6 DQ0 days in each month; valid up to 2100 19 14 DQ1 DQ5 Over .