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參數(shù)資料
| 型號： | UPD75P108BDW |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCOMPUTER |
| 中文描述： | 4位單片機 |
| 文件頁數(shù)： | 17/46頁 |
| 文件大?。?/td> | 381K |
| 代理商： | UPD75P108BDW |
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17
μ
PD75P108B
4.4
ERASURE METHOD (
μ
PD75P108BDW only)
The data contents programmed in the
μ
PD75P108BDW can be erased by exposure to ultra-violet rays via the
upper window.
The wavelength of erasable UVR is approx. 250 nm. The irradiation amount required for complete erasure is
15Ws/cm
2
(UVR intensity
×
erasure time).
Erasure requires approx. 15 to 20 minutes if a commercially available UVR lamp (wavelength 254 nm, intensity
12 mW/cm
2
).
Note 1. If exposed directly to sunshine or a fluorescent light for a long period, the contents may be erased. For
protection of the contents, mask the upper window with the lightshield cover film. Use the lightshield
cover film provided by NEC for UV EPROM products.
Note
2. When performing erasure, ensure that the distance between the UV lamp and the
μ
PD75P108BDW is 2.5
cm or less.
Remarks
The erasure time may be increased due to deterioration of the UV lamp, dirt or stains on the package
window surface.
4.5
SCREENING OF ONE-TIME PROM PRODUCTS
Due to the nature of their construction, it is not possible for NEC to fully test one-time PROM products
(
μ
PD75P108BCW,
μ
PD75P108BGF-3BE) before shipment. It is therefore recommended that screening which per-
forms PROM verification be carried out after high-temperature storage under the conditions shown below once the
necessary data has been written to the device.
NEC offers a fee-paying service under the QTOP microcomputer name which covers one-time PROM writing,
marking, screening and verification. Please contact our salesman for details.
Storage Temperature
Storage Time
125
°
C
24 hours
#
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