ST63142 datasheet(78/86 Pages) STMICROELECTRONICS

78 / 86 page

EPROM/OTP DESCRIPTION.

The ST63E1xx represents the generic part number

for the EPROM versions of the ST63140, 42, 26,

56 ROM products. They are intended for use dur-

ing the development of an application, and for pre-

production and small volume production.

The ST63T1xx OTP have the same charac-

teristics.

They both include EPROM memory instead of the

ROM memory of the ST631xx, and so the program

and constants of the program can be easily modi-

fied by the user with the ST63E1XX EPROM Pro-

gramming Board from SGS-THOMSON.

The ROM mask options of the ST631xx for OSD

polarities (HSYNC, VSYNC, R, G, B, BLANK) are

emulated with an EPROM OPTION BYTE. This is

programmed by the SGS-THOMSON EPROM

programming board and its associated software.

The EPROM Option Byte content will define the

OSD options as follows :

Opt7

Opt6

Opt5

Opt4

Opt3

Opt 2

Opt 1

Opt 0

Opt7-Opt6. Device specific bits

(1)

Opt5 : This bit define the BLANK polarity,

if 0 the polarity will be negative

if 1 the polarity will be positive..

Opt 4 : This bit define the RGB polarity,

if 0 the polarity will be negative

if 1 the polarity will be positive..

Opt 3 : This bit define the OSD H/Vsync polarity,

if 0 the polarity will be negative

if 1 the polarity will be positive.

Opt2-Opt0. Device specific bits

(1)

Note 1. Device specific bits. These reserved bits

must be programmed according to the following ta-

ble for their relevant device.

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

tions) the ST63E1xx,T1xx 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 of the ST63E1xx,T1xxis de-

scribed in the User Manual of the EPROM Pro-

gramming board.

On the ST63E1xx, all the 7948 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 ST63T1xx (OTP device) a reserved

area for test purposes exists, as for the ST631xx

ROM device. In order to avoid any discrepancy be-

tween program functionality when using the

EPROM, OTP and ROM it is recommended NOT

TO USE THESE RESERVED AREAS, even when

using the ST63E1xx. The Table 3 is a summary of

the EPROM/ROM Map and its reserved area.

THE READER IS ASKED TO REFER TO THE

DATASHEET OF THE ST631xx ROM-BASED

DEVICE FOR FURTHER DETAILS.

EPROM ERASING

The EPROM of the windowed package of the

ST63E1xx may be erased by exposure to Ultra

Violet light.

The erasure characteristic of the ST63E1xx

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 range3000-4000Å.

It is thus recommended that the window of the

ST63E1xx package be covered by an opaque label

to prevent unintentional erasure problems when

testing the application in such an environment.

The recommended erasure procedure of the

ST63E1xx EPROM is exposure to short wave ul-

traviolet light which has wavelength 2537Å. The in-

tegrated dose (i.e. UV intensity x exposure time)

for erasure should be a minimum of 15 W-sec/cm

The erasure time with this dosage is approximately

15 to 20 minutes using an ultraviolet lamp with

12000

µW/cm2 power rating. The ST63E1xx

should be placed within 2.5 cm (1 inch) of the lamp

tubes during erasure.

Sales Type

Opt7-Opt6

Opt2-Opt0

ST63E140/T140

0 0

1 0 0

ST63E142/T142

0 0

1 0 1

ST63E126/T126

0 0

1 0 1

ST63E156/T156

0 0

1 0 1

ST63E140,E142,E126,E156, T140,T142,T126,T156

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