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M27C512-15B6 데이터시트(PDF) 5 Page - STMicroelectronics |
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M27C512-15B6 데이터시트(HTML) 5 Page - STMicroelectronics |
5 / 22 page M27C512 Device operation 5/22 2 Device operation The modes of operations of the M27C512 are listed in the Operating Modes table. A single power supply is required in the read mode. All inputs are TTL levels except for GVPP and 12V on A9 for Electronic Signature. 2.1 Read mode The M27C512 has two control functions, both of which must be logically active in order to obtain data at the outputs. 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 M27C512 has a standby mode which reduces the active current from 30mA to 100µA The M27C512 is placed in the standby mode by applying a CMOS high signal to the E input. When in the standby mode, the outputs are in a high impedance state, independent of the GVPP input. Table 3. Operating modes(1) 1. X = V IH or VIL, VID = 12V ± 0.5V. Mode E GVPP A9 Q7-Q0 Read VIL VIL X Data Out Output Disable VIL VIH X Hi-Z Program VIL Pulse VPP X Data In Program Inhibit VIH VPP X Hi-Z Standby VIH X X Hi-Z Electronic Signature VIL VIL VID Codes Table 4. Electronic Signature Identifier A0 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 Hex Data Manufacturer’s Code VIL 001 0000 0 20h Device Code VIH 001 1110 1 3Dh |
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