HMNR28D

www.DataSheet4U.com HANBit HMNR28D(V) 5.0 or 3.3V, 16K bit (2 Kbit x 8) TIMEKEEPER NVSRAM Part No. HMNR28D(V) GENERAL DESCRIPTION The HMNR28D(V) TIMEKEEPER SRAM is a 2Kb x 8 non-volatile static RAM and real time clock organized as 2,048 words by 8 bits. The special DIP package provides a fully integrated battery back-up memory and real time clock solution. The HMNR28D(V) directly replaces industry standard 2Kbit 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 ■ 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) – HMNR28D : VCC = 4.5 to 5.5V 4.2V ≤ VPFD ≤ 4.5V – HMNR28DV: 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 2K x 8 SRAMS ■ SELF-CONTAINED BATTERY and CRYSTAL IN DIP PACKAGE OPTIONS w Timing 70 ns 85 ns MARKING -70 -85 PIN ASSIGNMENT A7 A6 A5 A4 A3 A2 A1 A0 DQ0 DQ1 DQ2 Vss 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 Vcc A8 A9 /WE /OE A10 /CE DQ7 DQ6 DQ5 DQ4 DQ3 24-pin Encapsu...