HMN88D Datasheet, PDF (1/9 Pages) Hanbit Electronics Co.,Ltd – Non-Volatile SRAM MODULE 64Kbit (8K x 8-Bit),28Pin DIP, 5V

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
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
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
w Data is automatically protected during power loss
w Commercial temperature operation
OPTIONS
w Timing
85 ns
100 ns
120 ns
150 ns
MARKING
- 85
-100
-120
-150
PIN ASSIGNMENT
NC 1
A12
2
A7
A6
3
4
A5
5
A4
6
A3
7
A2
8
A1
A0
DQ0
9
10
11
DQ1
DQ2
12
13
VSS
14
28 VCC
27 _/WE
26
25
NC
A8
24
A9
23
22
A11
/OE
21
20
19
18
17
16
A10
/CE
DQ7
DQ6
DQ5
DQ4
15 DQ₃
28-pin Encapsulated Package
URL : www.hbe.co.kr
Rev. 0.0 (April, 2002)
1
HANBit Electronics Co.,Ltd