HANBit
HMN1288D
Non-Volatile SRAM MODULE 1Mbit (128K x 8-Bit), 32Pin-DIP, 5V
Part No. HMN1288D
GENERAL DESCRIPTION
The HMN1288D Nonvolatile SRAM is a 1,048,576-bit static RAM organized as 131,072 bytes by 8 bits.
The HMN1288D 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 HMN1288D 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
PIN ASSIGNMENT
w High-density design : 1Mbit Design
w Battery internally isolated until power is applied
1
2
3
4
32
31
30
29
NC
A16
A14
A12
VCC
A15
NC
/WE
A13
A8
A9
A11
/OE
A10
/CE
DQ7
DQ6
DQ5
DQ4
DQ3
w Industry-standard 32-pin 128K x 8 pinout
w Unlimited write cycles
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
5
6
7
8
28
27
26
25
24
23
22
21
20
19
18
17
A7
A6
A5
A4
A3
A2
9
w Data is automatically protected during power loss
w Conventional SRAM operation; unlimited write cycles
10
11
12
13
14
15
16
A1
A0
DQ0
DQ1
DQ2
VSS
OPTIONS
w Timing
70 ns
MARKING
32-pin Encapsulated Package
- 70
- 85
-120
-150
85 ns
120 ns
150 ns
URL : www.hbe.co.kr
Rev. 1.0 (June, 2002)
1
HANBit Electronics Co.,Ltd
HANBIT [ HANBIT ELECTRONICS CO.,LTD ]
