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MBM29F033C-12PTN Datasheet(PDF) 9 Page - Fujitsu Component Limited. |
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MBM29F033C-12PTN Datasheet(HTML) 9 Page - Fujitsu Component Limited. |
9 / 46 page 9 MBM29F033C-70/-90/-12 s FUNCTIONAL DESCRIPTION Read Mode The MBM29F033C has two control functions which must be satisfied in order to obtain data at the outputs. CE is the power control and should be used for a device selection. OE is the output control and should be used to gate data to the output pins if a device is selected. Address access time (tACC) is equal to the delay from stable addresses to valid output data. The chip enable access time (tCE) is the delay from stable addresses and stable CE to valid data at the output pins. The output enable access time is the delay from the falling edge of OE to valid data at the output pins. (Assuming the addresses have been stable for at least tACC-tOE time.) Standby Mode There are two ways to implement the standby mode on the MBM29F033C device, one using both the CE and RESET pins; the other via the RESET pin only. When using both pins, a CMOS standby mode is achieved with CE and RESET inputs both held at VCC ±0.3 V. Under this condition the current consumed is less than 5 µA. A TTL standby mode is achieved with CE and RESET pins held at VIH. Under this condition the current is reduced to approximately 1 mA. During Embedded Algorithm operation, VCC Active current (ICC2) is required even CE = VIH. The device can be read with standard access time (tCE) from either of these standby modes. When using the RESET pin only, a CMOS standby mode is achieved with RESET input held at VSS ±0.3 V (CE = “H” or “L”). Under this condition the current consumed is less than 5 µA. A TTL standby mode is achieved with RESET pin held at VIL (CE = “H” or “L”). Under this condition the current required is reduced to approximately 1 mA. Once the RESET pin is taken high, the device requires tRH ns of wake up time before outputs are valid for read access. In the standby mode the outputs are in the high impedance state, independent of the OE input. Output Disable With the OE input at a logic high level (VIH), output from the device is disabled. This will cause the output pins to be in a high impedance state. Autoselect The autoselect mode allows the reading out of a binary code from the device and will identify its manufacturer and type. This mode is intended for use by programming equipment for the purpose of automatically matching the device to be programmed with its corresponding programming algorithm. This mode is functional over the entire temperature range of the device. To activate this mode, the programming equipment must force VID (11.5 V to 12.5 V) on address pin A9. Two identifier bytes may then be sequenced from the device outputs by toggling address A0 from VIL to VIH. All addresses are DON'T CARES except A0, A1, and A6. (See Table 3.) The manufacturer and device codes may also be read via the command register, for instances when the MBM29F033C is erased or programmed in a system without access to high voltage on the A9 pin. The command sequence is illustrated in Table 6. (Refer to Autoselect Command section.) Byte 0 (A0 = VIL) represents the manufacturer's code (Fujitsu = 04H) and byte 1 (A0 = VIH) the device identifier code for MBM29F033C = D4H. These two bytes are given in the table 3. All identifiers for manufacturer and device will exhibit odd parity with DQ7 defined as the parity bit. In order to read the proper device codes when executing the Autoselect, A1 must be VIL. (See Table 3.) |
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