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HMN4M8D Datasheet(PDF) 1 Page - Hanbit Electronics Co.,Ltd |
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HMN4M8D Datasheet(HTML) 1 Page - Hanbit Electronics Co.,Ltd |
1 / 9 page HANBit HMN4M8D URL : www.hbe.co.kr 1 HANBit Electronics Co.,Ltd Rev. 1.0 (May, 2002) GENERAL DESCRIPTION The HMN4M8D Nonvolatile SRAM is a 33,554,432-bit static RAM organized as 4,194,304 bytes by 8 bits. The HMN4M8D has a self-contained lithium energy source provide reliable non-volatility coupled with the unlimited write cycles of standard SRAM and integral control circuitry which constantly monitors the single 5V supply for an out-of- tolerance condition. When such a condition occurs, the lithium energy source is automatically switched on to sustain the memory until after VCC returns valid and write protection is unconditionally enabled to prevent garbled data. In addition the SRAM is unconditionally write-protected to prevent an inadvertent write operation. At this time the integral energy source is switched on to sustain the memory until after VCC returns valid. The HMN4M8D uses extremely low standby current CMOS SRAM’s, coupled with small lithium coin cells to provide non- volatility without long write-cycle times and the write-cycle limitations associated with EEPROM. FEATURES w Access time : 70, 85, 120, 150 ns w High-density design : 32Mbit Design w Battery internally isolated until power is applied w Industry-standard 40-pin 4,096K x 8 pinout w Unlimited write cycles w Data retention in the absence of VCC w 5-years minimum data retention in absence of power w Automatic write-protection during power-up/power-down cycles w Data is automatically protected during power loss w Industrial temperature operation OPTIONS MARKING w Timing 70 ns - 70 85 ns - 85 120 ns -100 150 ns -150 Non-Volatile SRAM MODULE 32Mbit (4,096K x 8-Bit), 40Pin-DIP, 5V Part No. HMN4M8D PIN ASSIGNMENT DQ6 DQ7 /WE A19 NC 1 40 13 28 15 26 16 25 11 30 12 29 14 27 2 39 4 37 5 36 7 34 10 31 8 33 6 35 9 32 17 24 A2 A21 A0 A7 A5 A4 A6 A1 A3 A12 A14 A16 DQ0 DQ1 DQ2 VSS VCC A11 A8 A9 A10 A13 A15 A17 /CE /OE 40-pin Encapsulated Package 18 23 19 22 A18 A20 3 38 20 21 NC NC NC NC DQ5 DQ4 DQ3 |
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