M27V102 データシートの表示（PDF） - STMicroelectronics

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M27V102

1 Mbit (64Kb x 16) Low Voltage UV EPROM and OTP EPROM

STMicroelectronics 

M27V102

and G at VIL, P at VIH, VPP at 12.75V and VCC at

6.25V.

On-Board Programming

The M27V102 can be directly programmed in the

application circuit. See the relevant Application

Note AN620.

Electronic Signature

The Electronic Signature (ES) mode allows the

reading out of a binary code from an EPROM that

will identify its manufacturer and type. This mode

is intended for use by programming equipment to

automatically match the device to be programmed

with its correspondingprogramming algorithm. The

ES mode is functional in the 25°C ± 5°C ambient

temperature range that is required when program-

ming the M27V102. To activate the ES mode, the

programming equipmentmust force 11.5Vto 12.5V

on address line A9 of the M27V102 with VPP = VCC

= 5V. Two identifier bytes may then be sequenced

from the device outputs by togglingaddress line A0

from VIL to VIH. All other address lines must be held

at VIL during Electronic Signature mode. Byte 0

(A0=VIL) represents the manufacturer code and

byte 1 (A0=VIH) the device identifier code. For the

STMicroelectronics M27V102, these two iden-tifier

bytes are given in Table 4 and can be read-out on

outputs Q0 to Q7. Note that the M27V102 and

M27C1024 have the same identifier bytes.

ERASURE OPERATION (applies to UV EPROM)

Theerasure characteristics of the M27V102is such

that erasure begins when the cells are exposed to

light with wavelengths shorter than approximately

4000 Å. It should be noted that sunlight and some

type of fluorescent lamps have wavelengths in the

3000-4000Å range. Research shows that constant

exposure to room level fluorescent lighting could

erase a typical M27V102 in about 3 years, while it

would take approximately 1 week to cause erasure

when exposed to direct sunlight. If the M27V102

is to be exposed to these types of lighting condi-

tions for extended periods of time, it is suggested

that opaque labels be put over the M27V102 win-

dow to prevent unintentionalerasure. The recom-

mended erasure procedure for the M27V102 is

exposure to short wave ultraviolet light which has

wavelength 2537 Å. The integrated dose (i.e. UV

intensity x exposure time) for erasure should be a

minimum of 15 W-sec/cm2. The erasure time with

this dosage is approximately 15 to 20 minutes

using an ultravioletlamp with 12000 µW/cm2 power

rating. The M27V102 should be placed within 2.5

cm (1 inch) of the lamp tubes during the erasure.

Some lamps have a filter on their tubes which

should be removed before erasure.

9/15

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