M27V512 Datasheet | STMicroelectronics

The M27V512 is a low voltage 512 Kbit EPROM offered in the two ranges UV (ultra viloet erase) and OTP (one time programmable). It is ideally suited for microprocessor systems and is organized as 65,536 by 8 bits. The M27V512 operates in the read mode with a supply voltage as low as 3V. 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 FDIP28W (window ceramic frit-seal package) has transparent lid which allows 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 M27V512 is offered in PDIP28, PLCC32 and TSOP28 (8 x 13.4 mm) packages. Table 1. Signal Names A0-A15 Q0-Q7 E GV PP VCC VSS Address Inputs Data Outputs Chip Enable Output Enable Supply Voltage Ground PLCC32 (K) TSOP28 (N) 8 x 13.4mm Figure 1. Logic Diagram 16 A0-A15 8 Q0-Q7 E GVPP AI00732B May 1998 1/16 Figure 2A. DIP Pin Connections Figure 2B. LCC Pin Connections AI01907 VSS DU Q3 Q4 Q5 AI00733B A15 A12 A7 A6 A5 A4 A3 A2 A1 A0 Q0 Q1 Q2 VSS 1 28 2 27 3 26 4 25 5 24 6 23 7 22 M27V512 8 21 9 20 10 19 11 18 12 17 13 16 14 15 VCC A14 A13 A8 A9 A11 GVPP A10 E Q7 Q6 Q5 Q4 Q3 A6 A5 A4 A3 A2 A1 A0 NC Q0 A7 A12 A15 DU VCC A14 A13 1 32 A8 A9 A11 NC GVPP A10 E Q7 Q6 9 M27V512 25 17 Q1 Q2 Warning: NC = Not Connected, DU = Don’t Use Figure 2C. TSOP Pin Connections GVPP A11 A9 A8 A13 A14 VCC A15 A12 A7 A6 A5 A4 A3 28 1 15 14 AI00734B A10 E Q7 Q6 Q5 Q4 Q3 VSS Q2 Q1 Q0 A0 A1 A2 DEVICE OPERATION The operating modes of the M27V512 are listed in the Operating Modes table. A single power supply is required in the read mode. All inputs are TTL levels except for GVPP and 12V on A9 for Electronic Signature. Read Mode The M27V512 has two control functions, both of...