HANBit
HMN88D
Non-Volatile SRAM MODULE 64Kbit (8K x 8-Bit),28Pin DIP, 5V
Part No. HMN88D
GENERAL DESCRIPTION
The HMN88D Nonvolatile SRAM is a 65,536-bit static RAM organized as 8,192 bytes by 8 bits.
The HMN88D 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 HMN88D 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
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Access time : 85, 100, 120, 150 ns
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High-density design : 64Kbit Design
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Battery internally isolated until power is applied
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Industry-standard 28-pin 8K x 8 pinout
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Unlimited writes cycles
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Data retention in the absence of V
CC
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10-years minimum data retention in absence of power
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Automatic write-protection during power-up/power-down
cycles
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Data is automatically protected during power loss
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Commercial temperature operation
PIN ASSIGNMENT
NC
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
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
CC
/WE
NC
A
8
A
9
A
11
/OE
A
10
/CE
DQ
7
DQ
6
DQ
5
DQ
4
DQ
3
28-pin Encapsulated Package
OPTIONS
w
Timing
85 ns
100 ns
120 ns
150 ns
MARKING
- 85
-100
-120
-150
URL : www.hbe.co.kr
Rev. 0.0 (April, 2002)
1
HANBit Electronics Co.,Ltd
HANBIT [ HANBIT ELECTRONICS CO.,LTD ]
