HMN328D View Datasheet(PDF) - Hanbit Electronics Co.,Ltd
Part Name
Description
Manufacturer
HMN328D Datasheet PDF : 9 Pages
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HANBit
HMN328D
Non-Volatile SRAM MODULE 256Kbit (32K x 8-Bit),28Pin DIP, 5V
Part No. HMN328D
GENERAL DESCRIPTION
The HMN328D nonvolatile SRAM is a 262,144-bit static RAM organized as 32,768 bytes by 8 bits.
The HMN328D 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 HMN328D 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
w High-density design : 256Kbit Design
w Battery internally isolated until power is applied
w Industry-standard 28-pin 32K 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
w Data is automatically protected during power loss
w Industrial temperature operation
OPTIONS
w Timing
70 ns
85 ns
120 ns
150 ns
MARKING
- 70
- 85
-120
-150
PIN ASSIGNMENT
A14
1
A12
2
A7
3
A6
4
A5
5
A4
6
A3
7
A2
8
A1
9
A0 10
DQ0 11
DQ1 12
DQ2 13
VSS
14
28
VCC
27 /WE
26
A13
25
A8
24
A9
23
A11
22 /O
21
AE10
20 /CE
19 DQ7
18 DQ6
17 DQ5
16 DQ4
15 DQ3
28-pin Encapsulated Package
URL : www.hbe.co.kr
Rev. 0.0 (April, 2002)
1
HANBit Electronics Co.,Ltd
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