HANBit
HMN4M8DV(N)
Non-Volatile SRAM MODULE 32Mbit (4,096K x 8-Bit), 40Pin-DIP, 3.3V
Part No. HMN4M8DV(N)
GENERAL DESCRIPTION
The HMN4M8DV Nonvolatile SRAM is a 33,554,432-bit static RAM organized as 4,194,304 bytes by 8 bits.
The HMN4M8DV 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 3.3V 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 t he memory until after V
CC
returns valid.
The HMN4M8DV 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 : 55, 70ns
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
PIN ASSIGNMENT
A
21
A
20
A
18
A
16
A
14
A
12
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
DQ
0
DQ
1
DQ
2
V
SS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
V
CC
A
19
NC
A
15
A
17
/WE
A
13
A
8
A
9
A
11
/OE
A
10
/CE
DQ
7
DQ
6
DQ
5
DQ
4
DQ
3
NC
A
21
A
20
A
18
A
16
A
14
A
12
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
DQ
0
DQ
1
DQ
2
V
SS
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
NC
V
CC
A
19
NC
A
15
A
17
/WE
A
13
A
8
A
9
A
11
/OE
A
10
/CE
DQ
7
DQ
6
DQ
5
DQ
4
DQ
3
NC
36-pin Encapsulated Package
w
Package Option
- HMN4M8DV
- HMN4M8DVN
- 36 Pin DIP Package
- 40 Pin DIP Package
40-pin Encapsulated Package
URL : www.hbe.co.kr
Rev. 1.0 (May, 2002)
1
HANBit Electronics Co.,Ltd
HANBIT [ HANBIT ELECTRONICS CO.,LTD ]
