ST72E121 datasheet(88/92 Pages) STMICROELECTRONICS

部件名	ST72E121

功能描述	8-BIT MCU WITH 8 TO 16K OTP/EPROM, 384 TO 512 BYTES RAM, WDG, SCI, SPI AND 2 TIMERS

PDF	92 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

88 / 92 page

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ST72E121 ST72T121

7 GENERAL INFORMATION

7.1 EPROM ERASURE

EPROM version devices are erased by exposure

to high intensity UV light admitted through the

transparent window. This exposure discharges the

floating gate to its initial state through induced

photo current.

It is recommended that the EPROM devices be

kept out of direct sunlight, since the UV content of

sunlight can be sufficient to cause functional fail-

ure. Extended exposure to room level fluorescent

lighting may also cause erasure.

An opaque coating (paint, tape, label, etc...)

should be placed over the package window if the

product is to be operated under these lighting con-

ditions. Covering the window also reduces IDD in

power-saving modes due to photo-diode leakage

currents.

An Ultraviolet source of wave length 2537 Å yield-

ing a total integrated dosage of 15 Watt-sec/cm2 is

required to erase the device. It will be erased in 15

to 20 minutes if such a UV lamp with a 12mW/cm2

power rating is placed 1 inch from the device win-

dow without any interposed filters.

ST72E121 数据表(PDF) 88 Page - STMicroelectronics