M27C801 STMICROELECTRONICS | Alldatasheet

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Technical content

8 Mbit (1Mb x 8) UV EPROM and OTP EPROM

■ 5V ± 10% SUPPLY VOLTAGE in READ OPERATION ■ ACCESS TIME: 45ns ■ LOW POWER CONSUMPTION: – Active Current 35mA at 5MHz – Standby Current 100µA ■ PROGRAMMING VOLTAGE: 12.75V ± 0.25V ■ PROGRAMMING TIME: 50µs/word ■ ELECTRONIC SIGNATURE – Manufacturer Code: 20h – Device Code: 42h

DESCRIPTION

The M27C801 is an 8 Mbit EPROM offered in the two ranges UV (ultra violet erase) and OTP (one time programmable). It is ideally suited for applica- tions where fast turn-around and pattern experi- mentation are important requirements and is organized as 1,048,576 by 8 bits. The FDIP32W (window ceramic frit-seal package) has transparent lid which allows the user to ex- pose the chip to ultraviolet light to erase the bit pat- tern. A new pattern can then be written to the device by following the programming procedure. For applications where the content is programmed only one time and erasure is not required, the M27C801 is offered in PDIP32, PLCC32 and TSOP32 (8 x 20 mm) packages. FDIP32W (F) PLCC32 (K) TSOP32 (N) 8 x 20 mm PDIP32 (B) Figure 1. Logic Diagram

1 A16

32 A19

Table 1. Signal Names

Table 2. Absolute Maximum Ratings (1)

  1. Minimum DC voltage on Input or Output is –0.5V with possible undershoot to –2.0V for a period less than 20ns. Maximum DC

voltage on Output is VCC +0.5V with possible overshoot to VCC +2V for a period less than 20ns. Table 3. Operating Modes Note: X = VIH or VIL, VID = 12V ± 0.5V. Table 4. Electronic Signature

Table 7. Read Mode DC Characteristics (1) Note: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP .

  1. Maximum DC voltage on Output is VCC +0.5V.

Note: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP.

  1. Sampled only, not 100% tested.
  2. Speed obtained with High Speed AC measurement conditions.

Figure 5. Read Mode AC Waveforms Note: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP .

  1. Sampled only, not 100% tested.

caused by the inductive effects of PCB traces.

Table 9. Programming Mode DC Characteristics (1) Note: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP . Table 10. MARGIN MODE AC Characteristics (1) Note: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP . applied to 8 bits in parallel to the data output pins.

Figure 6. MARGIN MODE AC Waveforms Note: A8 High level = 5V; A9 High level = 12V. Table 11. Programming Mode DC Characteristics (1) Note: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP .

  1. Sampled only, not 100% tested.

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 corresponding programming algorithm. The ES mode is functional in the 25°C ± 5°C am- bient temperature range that is required when pro- gramming the M27C801. To activate the ES mode, the programming equipment must force 11.5V to 12.5V on address line A9 of the M27C801. Two identifier bytes may then be se- quenced from the device outputs by toggling ad- dress line A0 from V IL to VIH. All other address lines must be held at VIL during Electronic Signa- ture mode. Byte 0 (A0 = VIL) represents the man- ufacturer code and byte 1 (A0 = VIH) the device identifier code. For the STMicroelectronics M27C801, these two identifier bytes are given in Table 4 and can be read-out on outputs Q7 to Q0. ERASURE OPERATION (applies to UV EPROM) The erasure characteristics of the M27C801 is such that erasure begins when the cells are ex- posed to light with wavelengths shorter than ap- proximately 4000 Å. It should be noted that sunlight and some type of fluorescent lamps have wavelengths in the 3000-4000 Å range. Research shows that constant exposure to room level fluorescent lighting could erase a typical M27C801 in about 3 years, while it would take ap- proximately 1 week to cause erasure when ex- posed to direct sunlight. If the M27C801 is to be exposed to these types of lighting conditions for extended periods of time, it is suggested that opaque labels be put over the M27C801 window to prevent unintentional erasure. The recommended erasure procedure for the M27C801 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 30 W-sec/cm 2. The erasure time with this dos- age is approximately 30 to 40 minutes using an ul- traviolet lamp with 12000 µW/cm 2 power rating. The M27C801 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.

Table 12. Ordering Information Scheme Note: 1. High Speed, see AC Characteristics section for further information. vice, please contact the STMicroelectronics Sales Office nearest to you. Table 1. Revision History

Table 13. FDIP32W - 32 pin Ceramic Frit-seal DIP with window, Package Mechanical Data Figure 9. FDIP32W - 32 pin Ceramic Frit-seal DIP with window, Package Outline

Figure 10. PDIP32 - 32 pin Plastic DIP, 600 mils width, Package Outline Table 14. PDIP32 - 32 pin Plastic DIP, 600 mils width, Package Mechanical Data

Table 15. PLCC32 - 32 lead Plastic Leaded Chip Carrier, Package Mechanical Data Figure 11. PLCC32 - 32 lead Plastic Leaded Chip Carrier, Package Outline

Table 16. TSOP32 - 32 lead Plastic Thin Small Outline, 8 x 20 mm, Package Mechanical Data Figure 12. TSOP32 - 32 lead Plastic Thin Small Outline, 8 x 20 mm, Package Outline

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