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M27128A-1F1 Datasheet(PDF) 2 Page - STMicroelectronics |
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M27128A-1F1 Datasheet(HTML) 2 Page - STMicroelectronics |
2 / 9 page Q2 VSS A3 A0 Q0 Q1 A2 A1 G Q5 A10 EP Q3 VPP Q7 Q6 Q4 A4 VCC A7 AI00785 M2716 8 1 2 3 4 5 6 7 9 10 11 12 20 19 18 17 16 15 A6 A5 A9 A8 23 22 21 14 13 24 Figure 2. DIP Pin Connections 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 VCC Supply Voltage –0.3 to 6 V VIO Input or Output Voltages –0.3 to 6 V VPP Program Supply –0.3 to 26.5 V PD Power Dissipation 1.5 W 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 M2716 has 3 modes of operation in the normal system environment. These are shown in Table 3. Read Mode. The M2716 read operation requires that G = VIL, EP = VIL and that addresses A0-A10 have been stabilized. Valid data will appear on the output pins after time tAVQV, tGLQV or tELQV (see Switching Time Waveforms) depending on which is limiting. Deselect Mode. The M2716 is deselected by mak- ing G = VIH. This mode is independent of EP and the condition of the addresses. The outputs are Hi-Z when G = VIH. This allows tied-OR of 2 or more M2716’s for memory expansion. Standby Mode (Power Down). The M2716 may be powered down to the standby mode by making EP = VIH. This is independent of G and automat- ically puts the outputs in the Hi-Z state. The power is reduced to 25% (132 mW max) of the normal operating power. VCC and VPP must be maintained at 5V. Access time at power up remains either tAVQV or tELQV (see Switching Time Waveforms). Programming The M2716 is shipped from SGS-THOMSON com- pletely erased. All bits will be at “1" level (output high) in this initial state and after any full erasure. Table 3 shows the 3 programming modes. Program Mode. The M2716 is programmed by introducing “0"s into the desired locations. This is done 8 bits (a byte) at a time. Any individual address, sequential addresses, or addresses chosen at ran- dom may be programmed. Any or all of the 8 bits associated with an address location may be pro- grammed with a single program pulse applied to the EP pin. All input voltage levels including the program pulse on chip enable are TTL compatible. The programming sequence is: with VPP = 25V, VCC = 5V, G = VIH and EP = VIL, an address is selected and the desired data word is applied to the output pins (VIL = “0" and VIH = ”1" for both address and data). After the address and data signals are stable the program pin is pulsed from VIL to VIH with a 2/9 M2716 |
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