HMN4M8D Datasheet, PDF (1/9 Pages) Hanbit Electronics Co.,Ltd – Non-Volatile SRAM MODULE 32Mbit (4,096K x 8-Bit), 40Pin-DIP, 5V

HANBit
HMN4M8D
Non-Volatile SRAM MODULE 32Mbit (4,096K x 8-Bit), 40Pin-DIP, 5V
Part No. HMN4M8D
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 V_CC 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 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 V_CC
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
w Timing
70 ns
85 ns
120 ns
150 ns
MARKING
- 70
- 85
-100
-150
PIN ASSIGNMENT
NC 1
A21
2
A20
3
A18
4
A16
5
A14
6
A12
7
A7
8
A6
9
A5
10
A4
11
A3
12
A2
13
A1
14
A0
15
DQ0 ¹⁶
DQ1 17
DQ2 ¹⁸
VSS
19
NC 20
40 ^NC
39 VCC
38
A19
37 NC
36
A15
35
A17
34 /WE
33
A13
32
A8
31
A9
30
A11
29 /OE
28
A10
27 /CE
26
DQ7
25
DQ6
24 DQ5
23 DQ4
22 DQ3
21 ^NC
40-pin Encapsulated Package
URL : www.hbe.co.kr
Rev. 1.0 (May, 2002)
1
HANBit Electronics Co.,Ltd