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HMNR1288DV-70I Datasheet(PDF) 1 Page - Hanbit Electronics Co.,Ltd |
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HMNR1288DV-70I Datasheet(HTML) 1 Page - Hanbit Electronics Co.,Ltd |
1 / 14 page HANBit HMNR1288D(V) URL : www.hbe.co.kr 1 HANBit Electronics Co.,Ltd Rev. 1.0 (April, 2002) 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 ■ MICROPROCESSOR POWER-ON RESET (Valid even during battery back-up mode) ■ PROGRAMMABLE ALARM OUTPUT ACTIVE IN BATTERY BACK-UP MODE OPTIONS MARKING w Timing 70 ns -70 85 ns -85 5.0 or 3.3V, 1 Mbit (128 Kbit x 8) TIMEKEEPER NVSRAM Part No. HMNR1288D(V) 1 32 12 21 14 19 15 18 10 23 11 22 13 20 2 31 3 30 4 29 6 27 9 24 7 26 5 28 8 25 16 17 A0 A7 A5 A4 A6 A1 A3 A2 A12 A14 A16 /RST DQ0 DQ1 DQ2 VSS A11 A8 A9 A10 A13 A15 IRQ/FT DQ3 DQ4 DQ5 DQ6 DQ7 VCC /CE /WE /OE 32-pin Encapsulated Package PIN ASSIGNMENT |
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