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HMNR28DV-85I Datasheet(PDF) 1 Page - Hanbit Electronics Co.,Ltd |
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HMNR28DV-85I Datasheet(HTML) 1 Page - Hanbit Electronics Co.,Ltd |
1 / 13 page HANBit HMNR28D(V) URL : www.hbe.co.kr 1 HANBit Electronics Co.,Ltd. Rev. 0.0 (March, 2002) 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 MARKING w Timing 70 ns -70 85 ns -85 5.0 or 3.3V, 16K bit (2 Kbit x 8) TIMEKEEPER NVSRAM Part No. HMNR28D(V) PIN ASSIGNMENT 24-pin Encapsulated Package 1 24 12 13 10 15 11 14 2 23 3 22 4 21 6 19 9 16 7 18 5 20 8 17 A7 A6 A5 A4 A3 A2 A1 A0 DQ0 DQ1 DQ2 Vss Vcc A8 A9 /WE /OE A10 /CE DQ7 DQ6 DQ5 DQ4 DQ3 |
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