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MX26L1620XAI-12 Datasheet(PDF) 7 Page - Macronix International |
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MX26L1620XAI-12 Datasheet(HTML) 7 Page - Macronix International |
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7 / 36 page  7 P/N:PM0827 REV. 0.4, JAN. 31, 2002 MX26L1620 REQUIREMENTS FOR READING ARRAY DATA To read array data from the outputs, the system must drive the CE and OE pins to VIL. CE is the power control and selects the device. OE is the output control and gates array data to the output pins. WE should remain at VIH. The internal state machine is set for reading array data upon device power-up, or after a hardware reset. This ensures that no spurious alteration of the memory contect occurs during the power transition. No command is necessary in this mode to obtain array data. Standard microprocessor read cycles that assert valid address on the device address inputs produce valid data on the device data outputs.The device remains enabled for read access until the command register contents are altered. WRITE COMMANDS/COMMAND SEQUENCES To program data to the device, the system must drive WE and CE to VIL, and OE to VIH. An erase operation can erase the entire device. The "Writing specific address and data commands or sequences into the command register initiates device operations. Table 1 defines the valid register command sequences. Writing incorrect address and data values or writing them in the improper sequence resets the device to reading array data."section has details on erasing the entire chip. After the system writes the autoselect command sequence, the device enters the autoselect mode. The system can then read autoselect codes from the internal reqister (which is separate from the memory array) on Q15-Q0. Standard read cycle timings apply in this mode. Refer to the Autoselect Mode and Autoselect Command Sequence section for more information. ICC2 in the DC Characteristics table represents the active current specification for the write mode. The "AC Characteristics" section contains timing specification table and timing diagrams for write operations. STANDBY MODE MX26L1620 can be set into Standby mode with two dif- ferent approaches. One is using both CE and RESET pins and the other one is using RESET pin only. When using both pins of CE and RESET, a CMOS Standby mode is achieved with both pins held at Vcc ± 0.3V. Under this condition, the current consumed is less than 50uA (typ.). If both of the CE and RESET are held at VIH, but not within the range of VCC ± 0.3V, the device will still be in the standby mode, but the standby currect will be larger. During Auto Algorithm operation, Vcc ac- tive current (Icc2) is required even CE = "H" until the operation is complated.The device can be read with stan- dard access time (tCE) from either of these standby modes. When using only RESET, a CMOS standby mode is achieved with RESET input held at Vss ± 0.3V, Under this condition the current is consumed less than 50uA (typ.). Once the RESET pin is taken high,the device is back to active without recovery delay. In the standby mode the outputs are in the high imped- ance state, independent of the OE input. MX26L1620 is capable to provide the Automatic Standby Mode to restrain power consumption during read-out of data. This mode can be used effectively with an applica- tion requested low power consumption such as handy terminals. To active this mode, MX26L1620 automatically switch themselves to low power mode when MX26L1620 ad- dresses remain stable during access time of tACC+30ns. It is not necessary to control CE, WE, and OE on the mode. Under the mode, the current consumed is typi- cally 50uA (CMOS level). OUTPUT DISABLE With the OE input at a logic high level (VIH), output from the devices are disabled. This will cause the output pins to be in a high impedance state. RESET OPERATION The RESET pin provides a hardware method of resetting the device to reading array data. When the RESET pin is driven low for at least a period of tRP, the device immediately terminates any operation in progress, tristates all output pins, and ignores all read/write commands for the duration of the RESET pluse. The |
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