AT83C5111 datasheet(69/86 Pages) ATMEL

69 / 86 page

AT8xC5111

4190A–8051–11/02

EPROM

EPROM Programming

Specific algorithm is implemented, use qualified device programmers from third party

vendors.

EPROM Erasure

(Windowed Packages

Only)

Erasing the EPROM erases the code array, the encryption array and the lock bits return-

ing the parts to full functionality.

Erasure leaves all the EPROM cells in a 1’s state (FF).

Erasure Characteristics

The recommended erasure procedure is exposure to ultraviolet light (at 2537 Å) to an

integrated dose at least 15 W-sec/cm2. Exposing the EPROM to an ultraviolet lamp of

12,000

µW/cm2 rating for 30 minutes, at a distance of about 25 mm, should be sufficient.

An exposure of 1 hour is recommended with most of standard erasers.

Erasure of the EPROM begins to occur when the chip is exposed to light with wave-

length shorter than approximately 4,000 Å. Since sunlight and fluorescent lighting have

wavelengths in this range, exposure to these light sources over an extended time (about

1 week in sunlight, or 3 years in room-level fluorescent lighting) could cause inadvertent

erasure. If an application subjects the device to this type of exposure, it is suggested

that an opaque label be placed over the window.

Signature Bytes

Signature Bytes Content

The AT8xC5111 has four signature bytes in location 30h, 31h, 60h and 61h. To read

these bytes follow the procedure for EPROM signature bytes reading. Table 56. shows

the content of the signature byte for the AT8xC5111.

Table 1. Signature Bytes Content

Location

Contents

Comment

30h

58h

Manufacturer Code: Atmel

31h

57h

Family Code: C51 X2

60h

2Eh

Product name: AT8xC5111 4K ROM version

60h

AEh

Product name: AT8xC5111 4K OTP version

61h

EFh

Product revision number: AT8xC5111 Rev.0

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