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M27V400 Datasheet(PDF) 2 Page - STMicroelectronics |
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M27V400 Datasheet(HTML) 2 Page - STMicroelectronics |
2 / 14 page M27V400 2/14 Figure 2. DIP Connections Q0 Q8 Q1 Q11 A2 VSS A1 A0 A14 Q15A–1 A15 A16 Q14 A13 BYTEVPP VSS Q7 Q12 Q10 Q9 VCC G Q4 Q6 A10 A9 E A3 A17 A8 A6 AI01635 M27C400 8 1 2 3 4 5 6 7 9 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 Q3 Q2 A5 A4 Q13 Q5 40 39 38 37 36 35 34 33 A12 A11 A7 Table 1. Signal Names A0-A17 Address Inputs Q0-Q7 Data Outputs Q8-Q14 Data Outputs Q15A–1 Data Output / Address Input E Chip Enable G Output Enable BYTEVPP Byte Mode / Program Supply VCC Supply Voltage VSS Ground DEVICE OPERATION The operating modes of the M27V400 are listed in the Operating Modes Table. A single power supply is required in the read mode. All inputs are TTL compatible except for VPP and 12V on A9 for the Electronic Signature. Read Mode The M27V400 has two organisations, Word-wide and Byte-wide. The organisation is selected by the signal level on the BYTEVPP pin. When BYTEVPP is at VIH the Word-wide organisation is selected and the Q15A–1 pin is used for Q15 Data Output. When the BYTEVPP pin is at VIL the Byte-wide or- ganisation is selected and the Q15A–1 pin is used for the Address Input A–1. When the memory is logically regarded as 16 bit wide, but read in the Byte-wide organisation, then with A–1 at VIL the lower 8 bits of the 16 bit data are selected and with A–1 at VIH the upper 8 bits of the 16 bit data are selected. The M27V400 has two control functions, both of which must be logically active in order to obtain data at the outputs. In addition the Word-wide or Byte- wide organisation must be selected. 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 independent of device selection. Assuming that the addresses are stable, the ad- dress 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 ad- dresses have been stable for at least tAVQV-tGLQV. Standby Mode The M27V400 has a standby mode which reduces the supply current from 30mA to 20µA. The M27V400 is placed in the standby mode by apply- ing a CMOS high signal to the E input. When in the standby mode, the outputs are in a high imped- ance state, independent of the G input. |
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