HMNR88DV

www.DataSheet4U.com HANBit HMNR88D(V) 5.0 or 3.3V, 64K bit (8 Kbit x 8) TIMEKEEPER NVSRAM Part No. HMNR88D(V) GENERAL DESCRIPTION The HMNR88D(V) TIMEKEEPER SRAM is a 8Kbit x 8 non-volatile static RAM and real time clock organized as 8,192 words by 8 bits. The special DIP package provides a fully integrated battery back-up memory and real time clock solution. The HMNR88D(V) directly replaces industry standard 8Kbit 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) – HMNR88D(V) : VCC = 4.5 to 5.5V 4.2V ≤ VPFD ≤ 4.5V – HMNR88D(V)V: 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 8K x 8 SRAMS ■ SELF-CONTAINED BATTERY and CRYSTAL IN DIP PACKAGE OPTIONS w Timing 70 ns 85 ns MARKING -70 -85 PIN ASSIGNMENT /RST NC A12 A7 A6 A5 A4 A3 A2 A1 A0 DQ0 DQ1 DQ2 VSS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VCC /WE NC A8 A9 A11 /OE A10 ...