HMN5128D Datasheet, PDF (1/9 Pages) Hanbit Electronics Co.,Ltd – Non-Volatile SRAM MODULE 4Mbit (512K x 8-Bit),32Pin-DIP, 5V

HANBit
HMN5128D
Non-Volatile SRAM MODULE 4Mbit (512K x 8-Bit),32Pin-DIP, 5V
Part No. HMN5128D
GENERAL DESCRIPTION
The HMN5128D Nonvolatile SRAM is a 4,194,304-bit static RAM organized as 524,288 bytes by 8 bits.
The HMN5128D 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 V_CC returns valid.
The HMN5128D 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 : 4Mbit Design
w Battery internally isolated until power is applied
w Industry-standard 32-pin 512K x 8 pinout
w Unlimited write cycles
w Data retention in the absence of V_CC
w 10-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 Conventional SRAM operation; unlimited write cycles
OPTIONS
w Timing
70 ns
85 ns
120 ns
150 ns
MARKING
-70
-85
-120
-150
PIN ASSIGNMENT
A18
1
A16
2
A14
3
A12
4
A7 5
A6 6
A5 7
A4 8
A3 9
A2 ₁₀
A1 11
A0 12
DQ0 ₁₃
DQ1 ₁₄
DQ2 15
VSS
16
32
VCC
31
A15
30
A17
29
/WE
28
A13
27
A8
26
A9
25
A11
24
/OE
23
A10
22
/CE
21
DQ7
20
DQ6
19
DQ5
18
DQ4
17
DQ3
32-pin Encapsulated Package
URL : www.hbe.co.kr
Rev. 0.0 (April, 2002)
1
HANBit Electronics Co.,Ltd