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M27V402-120N4TR 데이터시트(PDF) 3 Page - STMicroelectronics |
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3 / 13 page 3/13 M27V405 The M27V405 is pin compatible with the industry standard 4 Mbit, single voltage Flash Memory. It can be considered as a Flash Low Cost solution for production quantities. The M27V405 can also be operated as a standard 4 Mbit OTP EPROM (similar to M27C405) with a 5V power supply. The M27V405 is offered in PLCC32 and TSOP32 (12 x 20 mm) packages. DEVICE OPERATION The modes of operations of the M27V405 are list- ed in the Operating Modes table. A single power supply is required in the read mode. All inputs are TTL levels except for Vpp and 12V on A9 for Elec- tronic Signature. Read Mode The M27V405 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, indepen- dent of device selection. Assuming that the ad- dresses 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 sta- ble for at least tAVQV-tGLQV. Standby Mode The M27V405 has a standby mode which reduces the active current from 15mA to 20µA with low volt- age operation VCC ≤ 3.6V , see Read Mode DC Characteristics Table for details. The M27V405 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 G input. Table 3. Operating Modes Note: X = VIH or VIL, VID = 12V ± 0.5V. Table 4. Electronic Signature Mode E G A9 VPP Q0-Q7 Read VIL VIL X VCC or VSS Data Out Output Disable VIL VIH X VCC or VSS Hi-Z Program VIL Pulse VIH X VPP Data In Verify VIH VIL X VPP Data Out Program Inhibit VIH VIH X VPP Hi-Z Standby VIH XX VCC or VSS Hi-Z Electronic Signature VIL VIL VID VCC Codes Identifier A0 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 Hex Data Manufacturer’s Code VIL 00100000 20h Device Code VIH 10110100 B4h |
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