TSC87C52-20CA 데이터 시트보기 (PDF) - Temic Semiconductors

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TSC87C52-20CA

CMOS 0 to 33 MHz Programmable 8–bit Microcontroller

Temic Semiconductors 

TSC87C52

A0–A12

Programming Cycle

Read/Verify Cycle

D0–D7

Data In

Data Out

ALE/PROG

EA/VPP

Control

signals

12.75V

5V

0V

100us 10us

1 2345

Figure 9 Programming and verification signal’s waveform

Signature bytes

The TSC87C52 has four signature bytes in location 30h, 31h, 60h and 61h. To read these bytes follow the procedure

for EPROM verify but activate the control lines provided in Table 6 for Read Signature Bytes. Table 7 shows the

content of the signature byte for the TSC87C52.

Table 7 Signature bytes content

Location

30h

31h

60h

61h

Contents

58h

58h

ADh

XXh

Comment

Customer selection byte: TEMIC

Family selection byte: C51

TSC87C52

Product revision number

EPROM Erasure (Windowed Packages Only)

Erasing the EPROM erases the code array and also the encryption array returning the parts to full functionality.

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

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.

Erasure of the EPROM begins to occur when the chip is exposed to light with wavelength 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.

MATRA MHS

13

Rev. C – 10 Sept 1997

Preliminary

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