參數(shù)資料
型號(hào): 930105202
廠(chǎng)商: ATMEL CORP
元件分類(lèi): SRAM
英文描述: 512K X 8 STANDARD SRAM, 15 ns, DFP36
封裝: 0.500 INCH, DFP-36
文件頁(yè)數(shù): 11/14頁(yè)
文件大?。?/td> 349K
代理商: 930105202
6
AT60142F
4408H–AERO–05/10
Data Retention Mode
Atmel CMOS RAM's are designed with battery backup in mind. Data retention voltage
and supply current are guaranteed over temperature. The following rules insure data
retention:
1. During data retention chip select CS must be held high within V
CC to VCC -0.2V.
2. Output Enable (OE) should be held high to keep the RAM outputs high imped-
ance, minimizing power dissipation.
3. During power-up and power-down transitions CS and OE must be kept between
VCC + 0.3V and 70% of VCC.
4. The RAM can begin operation > tR ns after VCC reaches the minimum operation
voltages (3V).
Figure 1. Data Retention Timing
Data Retention Characteristics
Parameter
Description
Min
Typ TA = 25°CMax
Unit
VCCDR
VCC for data
retention
2.0
V
tCDR
Chip deselect
to data
retention time
0.0
ns
tR
Operation
recovery time
tAVAV (1)
1.
TAVAV = Read cycle time.
––
ns
ICCDR (2)
2.
CS = VCC, VIN = GND/VCC.
Data retention
current
–0.700
1.3
mA
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