M27V101 STMICROELECTRONICS | Alldatasheet
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Technical content
1 Mbit (128Kb x 8) Low Voltage UV EPROM and OTP EPROM
n LOW VOLTAGE READ OPERATION: 3V to 3.6V n FAST ACCESS TIME: 90ns n LOW POWER CONSUMPTION: – Active Current 15mA at 5MHz – Standby Current 20µA n PROGRAMMING VOLTAGE: 12.75V ± 0.25V n PROGRAMMING TIME: 100 µs/byte (typical) n ELECTRONIC SIGNATURE – Manufacturer Code: 20h – Device Code: 05h
DESCRIPTION
The M27V101 is a low voltage 1 Mbit EPROM of- fered in the two ranges UV (ultra violet erase) and OTP (one time programmable). It is ideally suited for microprocessor systems requiring large data or program storage and is organized as 131,072 by 8 bits. The M27V101 operates in the read mode with a supply voltage as low as 3V. The decrease in op- erating power allows either a reduction of the size of the battery or an increase in the time between battery recharges. The FDIP32W (window ceramic frit-seal package) has a transparent lid which allow the user to ex- pose the chip to ultraviolet light to erase the bit pat- tern. Figure 1. Logic Diagram Table 1. Signal Names
Figure 2B. LCC Pin Connections Warning: NC = Not Connected. AI00661 NC A10 P
1 A16
32 VPP
G E VSS Figure 2A. DIP Pin Connections Warning: NC = Not Connected. A13 A10 A14 A11 G E Q5Q1 Q3VSS NC PA16 A12 VPP VCC A15 AI01906 M27V1018 A new pattern can then be written to the device by following the programming procedure. For appli- cations where the content is programmed only one time and erasure is not required, the M27V101 is offered in both PDIP32, PLCC32 and TSOP32 (8 x 20 mm) packages. DEVICE OPERATION The operating modes of the M27V101 are listed in the Operating Modes table. A single power supply is required in the read mode. All inputs are TTL levels except for VPP and 12V on A9 for Electronic Signature. Read Mode The M27V101 has two control functions, both of which must be logically active in order to obtain data at the outputs. Chip Enable (E) is the power control and should be used for device selection. Output Enable (G) is the output control and should be used to gate data to the output pins, indepen- dent of device selection. Assuming that the ad- dresses are stable, the address access time AVQV ) is equal to the delay from E to output (tELQV ). Data is available at the output after a delay of tGLQV from the falling edge of G, assuming that E has been low and the addresses have been sta- ble for at least t AVQV -tGLQV . Figure 2C. TSOP Pin Connections Warning: NC = Not Connected. A4 A3 A13 A10 A14 A11 G E NC P A16 A12 VPP VCC A15 AI01152B M27V101 (Normal) 16 17 VSS
Table 2. Absolute Maximum Ratings
- 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
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.
Note: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP .
- Sampled only, not 100% tested.
- Speed obtained with High Speed AC measurament conditions.
caused by the inductive effects of PCB traces.
Figure 5. Read Mode AC Waveforms Note: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP .
- Sampled only, not 100% tested.
ly programming ’0’s into the desired bit locations.
Table 9. Programming Mode AC 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 M27V101 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 M27V101. To activate the ES mode, the programming equipment must force 11.5V to 12.5V on address line A9 of the M27V101, with V PP =V CC =5V. Two identifier bytes may then be sequenced from the device outputs by toggling ad- dress line A0 from VIL to VIH. All other address lines must be held at VILduring Electronic Signa- ture mode. Byte 0 (A0=VIL) represents the manufacturer code and byte 1 (A0=VIH) the device identifier code. For the STMicroelectronics M27V101, these two iden- tifier bytes are given in Table 4 and can be read- out on outputs Q0 to Q7. Note that the M27V101 and M27C1001 have the same identifier bytes. ERASURE OPERATION (applies to UV EPROM) The erasure characteristics of the M27V101 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 fluo- rescent lighting could erase a typical M27V101 in about 3 years, while it would take approximately 1 week to cause erasure when exposed to direct sunlight. If the M27V101 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 M27V101 window to prevent unintentional era- sure. The recommended erasure procedure for the M27V101 is exposure to short wave ultraviolet light which has a 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 M27V101 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 ST Sales Office nearest to you.
Table 12. 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
Table 13. PDIP32 - 32 pin Plastic DIP, 600 mils width, Package Mechanical Data Figure 9. PDIP32 - 32 pin Plastic DIP, 600 mils width, Package Outline
Table 14. PLCC32 - 32 lead Plastic Leaded Chip Carrier, rectangular, Package Mechanical Data Figure 10. PLCC32 - 32 lead Plastic Leaded Chip Carrier, rectangular, Package Outline
Figure 11. TSOP32 - 32 lead Plastic Thin Small Outline, 8 x 20mm, Package Outline Table 15. TSOP32 - 32 lead Plastic Thin Small Outline, 8 x 20mm, Package Mechanical Data
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