M27W202 STMICROELECTRONICS | Alldatasheet

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Technical content

2 Mbit (128Kb x16) Low Voltage UV EPROM and OTP EPROM

n 2.7V to 3.6V SUPPLY VOLTAGE in READ OPERATION n ACCESS TIME: –8 0 n s a t VCC = 3.0V to 3.6V – 100ns at VCC = 2.7V to 3.6V n LOW POWER CONSUMPTION: – Active Current 20mA at 5MHz – Standby Current 15µA n PIN COMPATIBLE with M27C202 n PROGRAMMING TIME: 100 µs/word n HIGH RELIABILITY CMOS TECHNOLOGY – 2,000V ESD Protection – 200mA Latchup Protection Immunity n ELECTRONIC SIGNATURE – Manufacturer Code: 0020h – Device Code: 001Ch

DESCRIPTION

The M27W202 is a low voltage 2 Mbit EPROM of- fered in the two range UV (ultra violet erase) and OTP (one time programmable). It is ideally suited for microprocessor systems requiring large data or program storage and is organised as 131,072 by 16 bits. The M27W202 operates in the read mode with a supply voltage as low as 2.7V at –40 to 85°C tem- perature range. The decrease in operating power allows either a reduction of the size of the battery or an increase in the time between battery re- charges. The FDIP40W (window ceramic frit-seal package) has a 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 application where the content is programmed only one time and erasure is not required, the M27W201 is offered in PDIP40, PLCC44 and TSOP40 (10 x 14 mm) packages. Figure 1. Logic Diagram

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,V ID = 12V ± 0.5V. Table 4. Electronic Signature Note: Outputs Q15-Q8 are set to ’0’.

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.

caused by the inductive effects of PCB traces.

Table 8. Read Mode AC 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.
  2. Speed obtained with High Speed AC measurement conditions.

Figure 5. Read Mode AC Waveforms

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. Programming Mode AC 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.

input is at 12.75V, E is at VILand P is pulsed to VIL. quired for the address and data inputs are TTL. CC is specified to be 6.25V± 0.25V.

The M27W202 can be directly programmed in the application circuit. See the relevant Application Note AN620. Electronic Signature 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 M27W202. To activate the ES mode, the programming equipment must force 11.5V to 12.5V on address line A9 of the M27W202 with V PP =V CC = 5V. Two identifier bytes may then be sequenced from the device out- puts by toggling address line A0 from VILto VIH. All other address lines must be held at VIL during Electronic Signature mode. Byte 0 (A0 = VIL) rep- resents the manufacturer code and byte 1 (A0 = VIH) the device identifier code. For the STMicroelectronics M27W202, 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 M27W201 are 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. Data shows that constant exposure to room level fluo- rescent lighting could erase a typical M27W201 in about 3 years, while it would take approximately 1 week to cause erasure when exposed to direct sunlight. If the M27W201 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 M27W201 window to prevent unintentional erasure. The recommended erasure procedure for the M27W201 is exposure to short wave ultraviolet light which has wavelength of 2537 Å. The inte- grated 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 approximate- ly 15 to 20 minutes using an ultraviolet lamp with 12000 µW/cm 2 power rating. The M27W201 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 11. Ordering Information Scheme Note: 1. High Speed, see AC Characteristics section for further information.

  1. This speed also guarantees 80ns access time at VCC = 3.0V to 3.6V.
  2. These speeds are replaced by the 120ns.
  3. Packages option available on request. Please contact STMicroelectronics local Sales Office.

vice, please contact the STMicroelectronics Sales Office nearest to you. Table 12. Revision History

Table 13. FDIP40W - 40 lead Ceramic Frit-seal DIP with window, Package Mechanical Data Figure 8. FDIP40W - 40 lead Ceramic Frit-seal DIP with window, Package Outline

Table 14. PDIP40 - 40 pin Plastic DIP, 600 mils width, Package Mechanical Data Figure 9. PDIP40 - 40 lead Plastic DIP, 600 mils width, Package Outline

Table 15. PLCC44 - 44 lead Plastic Leaded Chip Carrier, Package Mechanical Data Figure 10. PLCC44 - 44 lead Plastic Leaded Chip Carrier, Package Outline

Table 16. TSOP40 - 40 lead Plastic Thin Small Outline, 10 x 14 mm, Package Mechanical Data Figure 11. TSOP40 - 40 lead Plastic Thin Small Outline, 10 x 14 mm, Package Outline

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is registered trademark of STMicroelectronics  2000 STMicroelectronics - All Rights Reserved All other names are the property of their respective owners. STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. http://w ww.st.com