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 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 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
PIN ASSIGNMENT
w Access time : 85, 100, 120, 150 ns
w High-density design : 64Kbit Design
w Battery internally isolated until power is applied
w Industry-standard 28-pin 8K x 8 pinout
w Unlimited writes cycles
1
2
3
4
28
27
26
25
VCC
/WE
NC
A8
A9
A11
/OE
A10
/CE
DQ7
DQ6
DQ4
DQ3
NC
A12
A7
A6
A5
A4
A3
A2
A1
5
24
w Data retention in the absence of VCC
w 10-years minimum data retention in absence of power
w Automatic write-protection during power-up/power-down
cycles
6
7
23
22
8
9
10
11
21
20
19
18
A0
DQ0
DQ1
DQ2
VSS
w Data is automatically protected during power loss
w Commercial temperature operation
12
13
17
16
14
15
28-pin Encapsulated Package
OPTIONS
w Timing
85 ns
MARKING
- 85
-100
-120
-150
100 ns
120 ns
150 ns
URL : www.hbe.co.kr
Rev. 0.0 (April, 2002)
1
HANBit Electronics Co.,Ltd
HANBIT [ HANBIT ELECTRONICS CO.,LTD ]
