M27C4001 STMICROELECTRONICS | Alldatasheet
Document overview
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Technical content
4 Mbit (512Kb x 8) UV EPROM and OTP EPROM
■ 5V ± 10% SUPPLY VOLTAGE in READ OPERATION ■ ACCESS TIME: 35ns ■ LOW POWER CONSUMPTION: – Active Current 30mA at 5MHz – Standby Current 100µA ■ PROGRAMMING VOLTAGE: 12.75V ± 0.25V ■ PROGRAMMING TIME: 100µs/word ■ ELECTRONIC SIGNATURE – Manufacturer Code: 20h – Device Code: 41h
DESCRIPTION
The M27C4001 is a 4 Mbit EPROM offered in the two ranges UV (ultra violet erase) and OTP (one time programmable). It is ideally suited for micro- processor systems requiring large programs and is organised as 524,288 by 8 bits. The FDIP32W (window ceramic frit-seal package) and LCCC32W (leadless chip carrier package) have a transparent lid which allow 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 M27C4001 is offered in PDIP32, PLCC32 and TSOP32 (8 x 20 mm) packages. FDIP32W (F) LCCC32W (L) PLCC32 (C) TSOP32 (N) 8 x 20 mm 32 32 PDIP32 (B) Figure 1. Logic Diagram
1 A16
32 VPP
Table 1. Signal Names
Table 2. Absolute Maximum Ratings (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 (1) 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 .
- Maximum DC voltage on Output is VCC +0.5V.
- Sampled only, not 100% tested.
- Speed obtained with High Speed AC measurement conditions.
caused by the inductive effects of PCB traces. Figure 5. Read Mode AC Waveforms AI00724B Note: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP .
- Sampled only, not 100% tested.
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 .
- 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 M27C4001. To activate the ES mode, the programming equipment must force 11.5V to 12.5V on address line A9 of the M27C4001 with V PP = VCC = 5V. Two identifier bytes may then be sequenced from the device out- puts by toggling address line A0 from V IL to 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 = V IH) the device identifier code. For the STMicroelectronics M27C4001, these two identifi- er 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 M27C4001 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 M27C4001 in about 3 years, while it would take approximately 1 week to cause erasure when exposed to direct sunlight. If the M27C4001 is to be exposed to these types of lighting conditions for extended pe- riods of time, it is suggested that opaque labels be put over the M27C4001 window to prevent unin- tentional erasure. The recommended erasure pro- cedure for the M27C4001 is exposure to short wave ultraviolet light which has wavelength of 2537 Å. The integrated dose (i.e. UV intensity x exposure time) for erasure should be a minimum of 15 W-sec/cm 2. The erasure time with this dos- age is approximately 15 to 20 minutes using an ul- traviolet lamp with 12000 µW/cm 2 power rating. The M27C4001 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. vice, please contact the STMicroelectronics Sales Office nearest to you.
Table 12. Revision History
Table 13. FDIP32W - 32 pin Ceramic Frit-seal DIP with window, Package Mechanical Data Figure 8. FDIP32W - 32 pin Ceramic Frit-seal DIP with window, Package Outline
Figure 9. PDIP32 - 32 lead Plastic DIP, 600 mils width, Package Outline Table 14. PDIP32 - 32 lead Plastic DIP, 600 mils width, Package Mechanical Data
Table 15. LCCC32W - 32 lead Leadless Ceramic Chip Carrier, Package Mechanical Data Figure 10. LCCC32W - 32 lead Leadless Ceramic Chip Carrier, Package Outline
Table 16. PLCC32 - 32 lead Plastic Leaded Chip Carrier, Package Mechanical Data Figure 11. PLCC32 - 32 lead Plastic Leaded Chip Carrier, Package Outline
Figure 12. TSOP32 - 32 lead Plastic Thin Small Outline, 8 x 20 mm, Package Outline Table 17. TSOP32 - 32 lead Plastic Thin Small Outline, 8 x 20 mm, Package Mechanical Data
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