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M27C800-90B1TR Datasheet(PDF) 4 Page - STMicroelectronics |
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M27C800-90B1TR Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 18 page M27C800 4/18 DEVICE OPERATION The operating modes of the M27C800 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 M27C800 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 M27C800 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)isthe 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. Table 5. AC Measurement Conditions High Speed Standard Input Rise and Fall Times ≤ 10ns ≤ 20ns Input Pulse Voltages 0 to 3V 0.4V to 2.4V Input and Output Timing Ref. Voltages 1.5V 0.8V and 2V Figure 3. AC Testing Input Output Waveform AI01822 3V High Speed 0V 1.5V 2.4V Standard 0.4V 2.0V 0.8V Figure 4. AC Testing Load Circuit AI01823B 1.3V OUT CL CL = 30pF for High Speed CL = 100pF for Standard CL includes JIG capacitance 3.3k Ω 1N914 DEVICE UNDER TEST |
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