AT89C51ED2-SMSIM ATMEL Corporation, AT89C51ED2-SMSIM Datasheet - Page 15

• Manufacturer Part Number: AT89C51ED2-SMSIM
• Description: 8-bit Flash Microcontroller
• Manufacturer: ATMEL Corporation

Conclusions:
4.3.4.2 Cell retention
Purpose:
To extrapolate cell life duration at 125°C from bake measurements at high temperature.
Test parameters:
Lot:
Temperature: 250°C and 200°C
Duration:
Lifetime Prediction:
The equation used to describe memory cell retention is:
DVt (V) = A * (t[h])^m * exp (-1.05eV/kT[K])
Results :
Conclusions :
Extrapolation to 125°C - 10years = Vt loss is less than 0.8 mV
Rev. 0 – 2003 July
-1
-2
-3
-4
-5
0
-
-
-
1
Vt_wrt shift of 200 mV after 10k cycles
I_read decrease of 2.5 uA after 10kcycles (- 7 to 9 %)
No big difference between bit0 and bit 7 in terms of Vt or current variations Using the coefficients
56.8k cell - 9t0930 (#24/25)
9T0930
92 hours
Test measurements
Bake time (h)
y = 0,2138Ln(x) - 2,3118
y = 0,2211Ln(x) - 4,8026
10
100
200C
250C
AT89C51RD2 / AT89C51ED2 QualPack
290,0
270,0
250,0
230,0
210,0
190,0
170,0
150,0
1
Extrapolated Life Time
10
100
time (h)
1000
10000
100000
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