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M27V160-150XF1 Datasheet(PDF) 8 Page - STMicroelectronics |
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M27V160-150XF1 Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 25 page Device description M27V160 8/26 2 Device description Table 2 lists the operating modes of the M27V160. 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. 2.1 Read mode The M27V160 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 organisation 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 M27V160 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 address 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 addresses have been stable for at least tAVQV-tGLQV. 2.2 Standby mode The M27V160 has a standby mode which reduces the active current from 20mA to 20µA with low voltage operation VCC ≤ 3.6V, see Read Mode DC Characteristics table for details.The M27V160 is placed in the standby mode by applying a CMOS high signal to the Table 2. Operating Modes (1) 1. X = VIH or VIL, VID = 12V ± 0.5V. Mode E G BYTEVPP A9 Q15A–1 Q14-Q8 Q7-Q0 Read Word-wide VIL VIL VIH X Data Out Data Out Data Out Read Byte-wide Upper VIL VIL VIL XVIH Hi-Z Data Out Read Byte-wide Lower VIL VIL VIL XVIL Hi-Z Data Out Output Disable VIL VIH X X Hi-Z Hi-Z Hi-Z Program VIL Pulse VIH VPP X Data In Data In Data In Verify VIH VIL VPP X Data Out Data Out Data Out Program Inhibit VIH VIH VPP X Hi-Z Hi-Z Hi-Z Standby VIH X X X Hi-Z Hi-Z Hi-Z Electronic Signature VIL VIL VIH VID Code Codes Codes |
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