Datenblatt-Suchmaschine für elektronische Bauteile |
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M27256-3F1 Datenblatt(PDF) 2 Page - STMicroelectronics |
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M27256-3F1 Datenblatt(HTML) 2 Page - STMicroelectronics |
2 / 10 page Q2 VSS A3 A0 Q0 Q1 A2 A1 G Q5 A10 E Q3 A11 Q7 Q6 Q4 NC P A12 A4 VPP VCC A7 AI00777 M2764A 8 1 2 3 4 5 6 7 9 10 11 12 13 14 20 19 18 17 16 15 A6 A5 A9 A8 28 27 26 25 24 23 22 21 Figure 2. DIP Pin Connections Warning: NC = Not Connected. Symbol Parameter Value Unit TA Ambient Operating Temperature grade 1 grade 6 0 to 70 –40 to 85 °C TBIAS Temperature Under Bias grade 1 grade 6 –10 to 80 –50 to 95 °C TSTG Storage Temperature –65 to 125 °C VIO Input or Output Voltages –0.6 to 6.5 V VCC Supply Voltage –0.6 to 6.5 V VA9 A9 Voltage –0.6 to 13.5 V VPP Program Supply –0.6 to 14 V Note: Except for the rating "Operating Temperature Range", stresses above those listed in the Table "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above those indicated in the Operating sections of this specification is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. Refer also to the SGS-THOMSON SURE Program and other relevant quality documents. Table 2. Absolute Maximum Ratings DEVICE OPERATION The seven modes of operations of the M2764A are listed in the Operating Modes table. A single 5V 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 M2764A has two control functions, both of which must be logically satisfied 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, address access time (tAVQV) is equal to the delay from E to output (tELQV). Data is available at the outputs after 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 M2764A has a standby mode which reduces the maximum active power current from 75mA to 35mA. The M2764A is placed in the standby mode by applying a TTL high signal to the E input. When in the standby mode, the outputs are in a high impedance state, independent of the G input. Two Line Output Control Because EPROMs are usually used in larger mem- ory arrays, the product features a 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. 2/10 M2764A |
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Ähnliche Beschreibung - M27256-3F1 |
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