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M27C320 Scheda tecnica(PDF) 3 Page - STMicroelectronics |
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M27C320 Scheda tecnica(HTML) 3 Page - STMicroelectronics |
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3 / 15 page  3/15 M27C320 DEVICE OPERATION The operating modes of the M27C320 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 M27C320 has two organisations, Word-wide and Byte-wide. The organisation is selected by the signal level on the BYTE pin. When BYTE is at VIH the Word-wide organisation is selected and the Q15A–1 pin is used for Q15 Data Output. When the BYTE pin is at VIL the Byte-wide organisation is selected and the Q15A–1 pin is used for the Ad- dress Input A–1. When the memory is logically re- garded 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 M27C320 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 M27C320 has standby mode which reduces the supply current from 50mA to 100 µA. The M27C320 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. Table 3. Operating Modes Note: X = VIH or VIL,VID = 12V ± 0.5V. Table 4. Electronic Signature Note: Outputs Q8-Q15 are set to ’0’. Mode E GVPP BYTE A9 Q0-Q7 Q8-Q14 Q15A–1 Read Word-wide VIL VIL VIH X Data Out Data Out Data Out Read Byte-wide Upper VIL VIL VIL X Data Out Hi-Z VIH Read Byte-wide Lower VIL VIL VIL X Data Out Hi-Z VIL Output Disable VIL VIH X X Hi-Z Hi-Z Hi-Z Program VIL Pulse VPP VIH X Data In Data In Data In Program Inhibit VIH VPP VIH X Hi-Z Hi-Z Hi-Z Standby VIH X X X Hi-Z Hi-Z Hi-Z Electronic Signature VIL VIL VIH VID Codes Codes Code Identifier A0 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 Hex Data Manufacturer’s Code VIL 001 000 00 20h Device Code VIH 001 100 10 32h |
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