ST6380 datasheet(77/82 Pages) STMICROELECTRONICS

77 / 82 page

77/82

ST63E88,ST63T88, ST63E89,ST63T89

1.2 EPROM/OTP DESCRIPTION

The ST63E88 and ST63E89 are the EPROM ver-

sion of the ST6380, 82, 88 and ST6381, 83, 89

ROM products. They are intended for use during

the development of an application, and for pre-pro-

duction

and

small

volume

production.

The

ST63T88 and ST63T89 OTPs have the same

characteristics. They both include EPROM memo-

ry instead of the ROM memory of the ST6388, 89,

and so the program and constants of the program

can be easily modified by the user with the

ST63E8x EPROM programming board from STMi-

croelectronics.

The EPROM OPTION BYTE is programmed by

the EPROM programming board and its associat-

ed software.

The EPROM Option Byte content will define the

OSD options as follows:

b7-2: Not used.

Opt 1: This option bit disconnect the Schmitt trig-

ger of PC7 and PB0 to prevent some electro-mag-

netic problems when these pads are not bonded.

-”0”: Schmitt triggers are connected to I/O’s inputs.

-”1”: Schmitt triggers are disconnected from I/O’s

inputs.

Opt 0: This option bit enables or disables the Pow-

er On/Off Reset.

-”0”: The Power On/Off Reset is enabled.

-”1”: The Power On/Off Reset is disabled.

From a user point of view (with the following ex-

ceptions) the ST63E8x,T8x products have exactly

the same software and hardware features of the

ROM version. An additional mode is used to con-

figure the part for programming of the EPROM,

this is set by a +12.5V voltage applied to the

TEST/VPP

pin.

The

programming

the

ST63E8x,T8x is described in the User Manual of

the EPROM Programming board.

On the ST63E88, 89, all the 20140 bytes of PRO-

GRAM memory are available for the user, as all

the EPROM memory can be erased by exposure

to UV light. On the ST63T88, 89 (OTP device) a

reserved area for test purposes exists, as for the

ST6388, 89 ROM device. In order to avoid any dis-

crepancy between program functionality when us-

ing the EPROM, OTP and ROM it is recommend-

ed NOT TO USE THESE RESERVED AREAS,

even when using the ST63E88, 89. The Table 4

on page 10 is a summary of the EPROM/ROM

Map and its reserved area.

THE READER IS ASKED TO REFER TO THE

DATASHEET OF THE ST638x ROM-BASED DE-

VICE FOR FURTHER DETAILS.

1.3 EPROM ERASING

The EPROM of the windowed package of the

ST63E8, 89 may be erased by exposure to Ultra

Violet light.

The erasure characteristic of the ST63E88, 89

EPROM is such that erasure begins when the

memory is exposed to light with wave lengths

shorter than approximately 4000Å. It should be

noted that sunlight and some types of fluorescent

lamps have wavelengths in the range 3000-

4000Å. It is thus recommended that the window of

the ST63E88, 89 package be covered by an

opaque label to prevent unintentional erasure

problems when testing the application in such an

environment.The recommended erasure proce-

dure of the ST63E88, 89 EPROM is exposure to

short wave ultraviolet light which has wavelength

2537Å. The integrated dose (i.e. UV intensity x ex-

posure 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 ultravi-

olet lamp with 12000mW/cm2 power rating. The

ST63E88, 89 should be placed within 2.5cm (1

inch) of the lamp tubes during erasure.

---

Opt 1

Opt 0

ST6380 数据表(PDF) 77 Page - STMicroelectronics

ST6380 数据表(HTML) 77 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82

数据表下载