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PDF HMN328D Data sheet ( Hoja de datos )
| Número de pieza | HMN328D | |
| Descripción | Non-Volatile SRAM MODULE 256Kbit | |
| Fabricantes | Hanbit Electronics | |
| Logotipo |  |
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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
1 page  
HANBit
HMN328D
READ CYCLE (TA= TOPR, VCCmin £ VCC≤ VCCmax )
PARAMETER
SYMBOL CONDITIONS
-70
-85
-120
-150
UNIT
MIN MAX MIN MAX MIN MAX MIN MAX
Read Cycle Time
tRC
70 - 85 - 120 - 150 -
ns
Address Access Time
tACC Output load A - 70 - 85 - 120 - 150 ns
Chip enable access time
tACE Output load A - 70 - 85 - 120 - 150 ns
Output enable to Output valid
tOE Output load A - 35 - 45 - 60 - 70 ns
Chip enable to output in low Z
tCLZ
Output load B
5
-
5
-
5
- 10 -
ns
Output enable to output in low Z
tOLZ
Output load B
5
-
0
-
0
-
5
-
ns
Chip disable to output in high Z
tCHZ Output load B 0 25 0 35 0 45 0 60 ns
Output disable to output high Z
tOHZ Output load B 0 25 0 25 0 35 0 50 ns
Output hold from address change
tOH
Output load A 10 - 10 - 10 - 10 -
ns
WRITE CYCLE (TA= TOPR, Vccmin £ Vcc ≤ Vccmax )
PARAMETER
SYMBOL CONDITIONS
-70
MIN MAX
-85
MIN MAX
-120
MIN MAX
-150
Min Max
Write Cycle Time
tWC
70 - 85 - 120 - 150 -
Chip enable to end of write
tCW
Note 1
65 - 75 - 100 - 100 -
Address setup time
tAS
Note 2
0-0-0-0-
Address valid to end of write
tAW
Note 1
65 - 75 - 100 - 90 -
Write pulse width
tWP
Note 1
55 - 65 - 85 - 90 -
Write recovery time (write cycle 1)
tWR1
Note 3
5-5-5-5-
Write recovery time (write cycle 2)
tWR2
Note 3
15 - 15 - 15 - 15 -
Data valid to end of write
tDW
30 - 35 - 45 - 50 -
Data hold time (write cycle 1)
tDH1
Note 4
0-0-0-0-
Data hold time (write cycle 2)
tDH2
Note 4
10 - 10 - 10 - 0 -
Write enabled to output in high Z
tWZ
Note 5
0 25 0 30 0 40 0 50
Output active from end of write
tOW
Note 5
5-0-0-5-
NOTE: 1. A write ends at the earlier transition of /CE going high and /WE going high.
2. A write occurs during the overlap of allow /CE and a low /WE. A write begins at the later transition of /CE
going low and /WE going low.
3. Either tWR1 or tWR2 must be met.
4. Either tDH1 or tDH2 must be met.
5. If /CE goes low simultaneously with /WE going low or after /WE going low, the outputs remain in high-
impedance state.
UNI
T
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
URL : www.hbe.co.kr
Rev. 0.0 (April, 2002)
5 HANBit Electronics Co.,Ltd
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet HMN328D.PDF ] | |
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