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M27C516-55XN1TR Datasheet(PDF) 3 Page - STMicroelectronics |
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M27C516-55XN1TR Datasheet(HTML) 3 Page - STMicroelectronics |
3 / 12 page Mode E G P A9 VPP Q0 - Q15 Read VIL VIL VIH XVCC Data Out Output Disable VIL VIH XX VCC Hi-Z Program VIL XVIL Pulse X VPP Data In Verify VIL VIL VIH XVPP Data Out Program Inhibit VIH XX X VPP Hi-Z Standby VIH XX X VCC Hi-Z Electronic Signature VIL VIL VIH VID VCC Codes Notes:X = VIH or VIL,VID =12V ± 0.5V Table 3. Operating Modes Identifier A0 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 Hex Data Manufacturer’s Code VIL 00 1000 00 20h Device Code VIH 00 0011 11 0Fh Note: Outputs Q8-Q15 are set to ’0’. Table 4. Electronic Signature DEVICE OPERATION The operating modes of the M27C516 are listed in the Operating Modes table. A single power supply is required in the read mode. All inputs are TTL levels except for G and 12V on A9 for Electronic Signature. Read Mode The M27C516 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, inde- pendent of device selection. Assuming that the addresses are stable, the address access time (tAVQV) 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 stable for at least tAVQV-tGLQV. Standby Mode The M27C516 has a standby mode which reduces the supply current from 30mA to 100 µA. The M27C516 is placed in the standby mode by apply- ing a CMOS high signal to the E input. When in the standbymode, the outputs are in a high impedance state, independent of the G input. Two Line Output Control Because OTP EPROMs are usually used in larger memory arrays, the product featuresa 2 line control function which accommodates the use of multiple memory connection. The two line control function allows: a. the lowest possible memory power dissipation, b. complete assurance that output bus contention will not occur. For the most efficient use of these two control lines, E should be decoded and used as the primary device selecting function, while G should be made a common connection to all devices in the array and connected to the READ line from the system control bus. This ensures that all deselected mem- ory devices are in their low power standby mode and that the output pins are only active when data is required from a particular memory device. 3/12 M27C516 |
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