M27W402
M27W402 is 4 Mbit 256Kb x16 Low Voltage UV EPROM and OTP EPROM manufactured by STMicroelectronics.
DESCRIPTION
The M27W402 is a low voltage 4 Mbit EPROM offered 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 262,144 by 16 bits. The M27W402 operates in the read mode with a supply voltage as low as 2.7V at
- 40 to 85°C temperature range. The decrease in operating power allows either a reduction of the size of the battery or an increase in the time between battery recharges. The FDIP40W (window ceramic frit-seal package) has a transparent lids which allow the user to expose the chip to ultraviolet light to erase the bit pattern. 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 M27W402 is offered in PDIP40, PLCC44 and TSOP40 (10 x 20 mm) packages.
18 A0-A17
16 Q0-Q15
AI01863
March 2000
1/15
Figure 2A. DIP Connections
VPP E Q15 Q14 Q13 Q12 Q11 Q10 Q9 Q8 VSS Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 G 1 40 2 39 3 38 4 37 5 36 6 35 7 34 8 33 9 32 10 31 M27W402 11 30 12 29 13 28 14 27 15 26 16 25 17 24 18 23 19 22 20 21
AI02672
Figure 2B. LCC Connections
VCC A17 A16 A15 A14 A13 A12 A11 A10 A9 VSS A8 A7 A6 A5 A4 A3 A2 A1 A0
Q12 Q11 Q10 Q9 Q8 VSS NC Q7 Q6 Q5 Q4
Q13 Q14 Q15 E VPP NC VCC A17 A16 A15 A14 1 44 A13 A12 A11 A10 A9 VSS NC A8 A7 A6 A5 12 M27W402 34 23 Q3 Q2 Q1 Q0 G NC A0 A1 A2 A3 A4
AI01865
Figure 2C. TSOP Connections
A9 A10 A11 A12 A13 A14 A15 A16 A17 VCC VPP E DQ15 DQ14 DQ13 DQ12 DQ11 DQ10 DQ9 DQ8 1 40 VSS A8 A7 A6 A5 A4 A3 A2 A1 A0 G DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7 VSS
Table 1. Signal Names
A0-A17 Q0-Q15 E G VPP VCC VSS NC Address Inputs Data Outputs Chip Enable Output Enable Program Supply Supply Voltage Ground Not Connected Internally
10 11
M27W402 (Normal)
31 30
AI01866
2/15
Table 2. Absolute Maximum Ratings (1)
Symbol TA TBIAS TSTG VIO (2) VCC...
