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HMNR328DV-85I 参数 Datasheet PDF下载

HMNR328DV-85I图片预览
型号: HMNR328DV-85I
PDF下载: 下载PDF文件 查看货源
内容描述: 5.0或3.3V , 256K位( 32千位×8 ) TIMEKEEPER NVSRAM [5.0 or 3.3V, 256K bit (32 Kbit x 8) TIMEKEEPER NVSRAM]
分类和应用: 静态存储器
文件页数/大小: 13 页 / 302 K
品牌: HANBIT [ HANBIT ELECTRONICS CO.,LTD ]
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HANBit  
HMNR328D(V)  
WRITE Mode AC Characteristics  
HMNR328D  
-70  
HMNR328D  
-100  
HMNR328DV  
Symbol  
Parameter(1)  
Unit  
-85  
Min  
Max  
Min  
Max  
Min  
Max  
tAVAV  
tAVWL  
tAVEL  
WRITE Cycle Time  
70  
0
100  
0
85  
0
nS  
nS  
nS  
nS  
nS  
nS  
nS  
nS  
Address Valid to WRITE Enable Low  
Address Valid to Chip Enable Low  
WRITE Enable Pulse Width  
0
0
0
tWLWH  
tELEH  
tWHAX  
tEHAX  
tDVWH  
50  
55  
0
80  
80  
10  
10  
50  
55  
60  
0
Chip Enable Low to Chip Enable High  
WRITE Enable High to Address Transition  
Chip Enable High to Address Transition  
Input Valid to WRITE Enable High  
0
0
30  
30  
tDVEH  
tWHDX  
tEHDX  
Input Valid to Chip Enable High  
WRITE Enable High to Input Transition  
Chip Enable High to Input Transition  
WRITE Enable Low to Output High-Z  
Address Valid to WRITE Enable High  
Address Valid to Chip Enable High  
WRITE Enable High to Output Transition  
30  
5
50  
5
30  
0
nS  
nS  
nS  
nS  
nS  
nS  
nS  
5
5
0
(2,3)  
tWLQZ  
25  
50  
25  
tAVWH  
tAVEH  
60  
60  
5
80  
80  
5
65  
65  
5
(2,3)  
tWHQX  
Note : 1. Valid for Ambient Operating Temperature: TA = 0 to 70°C; VCC = 4.5 to 5.5V or 3.0 to 3.6V (except where  
noted).  
2. CL = 5pF.  
3. If /CE goes low simultaneously with /WE going low, the outputs remain in the high impedance state.  
Data Retention Mode  
With valid VCC applied, the HMNR328D(V) operates as a conventional Bytewide static RAM. Should the supply voltage  
decay, the RAM will automatically deselect, write protecting itself when VCC falls between VPFD (max), VPFD (min) window.  
All outputs become high impedance and all inputs are treated as Don't care.”  
Note : A power failure during a WRITE cycle may corrupt data at the current addressed location, but does not jeopardize  
the rest of the RAM's content. At voltages below VPFD (min), the memory will be in a write protected state, provided the VCC  
fall time is not less than tF. The HMNR328D(V) may respond to transient noise spikes on VCC that cross into the deselect  
window during the time the device is sampling VCC. Therefore, decoupling of the power supply lines is recommended.  
When VCC drops below VSO, the control circuit switches power to the internal battery, preserving data and powering the  
clock. The internal energy source will maintain data in the HMNR328D(V) for an accumulated period of at least 10 years  
at room temperature. As system power rises above VSO, the battery is disconnected, and the power supply is switched to  
external VCC . Write protection continues until VCC reaches VPFD (min) plus tREC (min). Normal RAM operation can resume  
tREC after VCC exceeds VPFD (max).  
URL : www.hbe.co.kr  
8
HANBit Electronics Co.,Ltd.  
Rev. 0.0 (January, 2002)