HMNR1288D

www.DataSheet4U.com HANBit HMNR1288D(V) 5.0 or 3.3V, 1 Mbit (128 Kbit x 8) TIMEKEEPER NVSRAM Part No. HMNR1288D(V) GENERAL DESCRIPTION The HMNR1288D(V) TIMEKEEPER SRAM is a 128Kb x 8 non-volatile static RAM and real time clock organized as 131,072 words by 8 bits. The special DIP package provides a fully integrated battery back-up memory and real time clock solution. The HMNR1288D(V) directly replaces industry standard 128Kbit x 8 SRAMs. It also provides the non-volatility of Flash without any requirement for special WRITE timing or limitations on the number of WRITEs that can be performed. FEATURES ■ YEAR 2000 COMPLIANT ■ INTEGRATED LOW POWER SRAM, REAL TIME CLOCK, POWER-FAIL CONTROL CIRCUIT, BATTERY and CRYSTAL ■ BCD CODED YEAR, MONTH, DAY, DATE, HOURS, MINUTES, and SECONDS ■ AUTOMATIC POWER-FAIL CHIP DESELECT and WRITE PROTECTION VOLTAGES : (VPFD = Power-fail Deselect Voltage) – HMNR1288D : VCC = 4.5 to 5.5V 4.2V ≤ VPFD ≤ 4.5V – HMNR1288DV: VCC = 3.0 to 3.6V 2.7V ≤ VPFD ≤ 3.0V ■ CONVENTIONAL SRAM OPERATION : UNLIMITED WRITE CYCLES ■ SOFTWARE CONTROLLED CLOCK CALIBRATION FOR HIGH ACCURACY APPLICATIONS ■ 10 YEARS OF DATA RETENTION and CLOCK OPERATION IN THE ABSENCE OF POWER PIN and FUNCTION COMPATIBLE WITH INDUSTRY STANDARD 128K x 8 SRAMS ■ SELF-CONTAINED BATTERY and CRYSTAL IN DIP PACKAGE ■ BATTERY LOW WARNING FLAG ■ SOFTWARE CONTROLLED CLOCK CALIBRATION FOR HIGH ACCURACY APPLICATIONS PIN ASSIGNMENT ■ MICROPROCESSOR POWER-ON RESET (Valid even during battery back-up mode...