M27W400 STMICROELECTRONICS | Alldatasheet
Document overview
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Technical content
4 Mbit (512Kb x8 or 256Kb x16)
Low Voltage UV EPROM and OTP EPROM ■ 2.7 to 3.6V LOW VOLTAGE in READ OPERATION ■ READ ACCESS TIME: –8 0 n s a t VCC = 3.0 to 3.6V – 100ns at VCC = 2.7 to 3.6V ■ BYTE-WIDE or WORD-WIDE CONFIGURABLE ■ 4 Mbit MASK ROM REPLACEMENT ■ LOW POWER CONSUMPTION – Active Current 20mA at 8MHz – Stand-by Current 15µA ■ PROGRAMMING VOLTAGE: 12.5V ± 0.25V ■ PROGRAMMING TIME: 50µs/word ■ ELECTRONIC SIGNATURE – Manufacturer Code: 20h – Device Code: B8h
DESCRIPTION
The M27W400 is a low voltage 4 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. It is organised as either 512 Kwords of 8 bit or 256 Kwords of 16 bit. The pin- out is compatible with the most common 4 Mbit Mask ROM. The M27W400 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 M27W400 is offered in PDIP40 and PLCC44 pack- ages. FDIP40W (F) PDIP40 (B) PLCC44 (K) Figure 1. Logic Diagram
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 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 .
- Maximum DC voltage on Output is VCC +0.5V.
ductive effects of PCB traces.
Table 8. Read Mode AC Characteristics (1)
- Sampled only, not 100% tested.
- Speed obtained with High Speed measurement conditions.
Figure 7. BYTE Transition AC Waveforms Note: Chip Enable (E) and Output Enable (G) = VIL. 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.
Figure 8. Programming and Verify Modes AC Waveforms
Figure 9. Programming Flowchart margin to each programmed cell. with its corresponding programming algorithm. can be read-out on outputs Q7 to Q0.
Table 11. Ordering Information Scheme Note: 1. High Speed, see AC Characteristics section for further information.
- This speed also guarantees 80ns access time at VCC = 3.0 to 3.6V.
- For Ceramic Package please contact our Sales Office.
vice, please contact the STMicroelectronics Sales Office nearest to you. Table 1. Revision History
Table 12. FDIP40W - 40 lead Ceramic Frit-seal DIP with window, Package Mechanical Data Figure 10. FDIP40W - 40 lead Ceramic Frit-seal DIP with window, Package Outline
Table 13. PDIP40 - 40 pin Plastic DIP, 600 mils width, Package Mechanical Data Figure 11. PDIP40 - 40 lead Plastic DIP, 600 mils width, Package Outline
Table 14. PLCC44 - 44 lead Plastic Leaded Chip Carrier, Package Mechanical Data Figure 12. PLCC44 - 44 lead Plastic Leaded Chip Carrier, Package Outline
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