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MBM29F400TC-70 Datasheet(PDF) 10 Page - Fujitsu Component Limited. |
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MBM29F400TC-70 Datasheet(HTML) 10 Page - Fujitsu Component Limited. |
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10 / 47 page  10 MBM29F400TC-55/-70/-90/MBM29F400BC-55/-70/-90 s FUNCTIONAL DESCRIPTION Read Mode The MBM29F400TC/BC 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 - tCE time). Standby Mode There are two ways to implement the standby mode on the MBM29F400TC/BC devices, 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 max. A TTL standby mode is achieved with CE and RESET pins held at VIH. Under this condition the current is reduced to approximately 1mA. 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 is consumed is less than 5 µA max. 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 1mA. Once the RESET pin is taken high, the device requires tRH 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 devices 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 devices outputs by toggling address A0 from VIL to VIH. All addresses are don't cares except A0, A1 and A6 ( A-1) (See Tables 4.1). The manufacturer and device codes may also be read via the command register, for instances when the MBM29F400TC/BC is erased or programmed in a system without access to high voltage on the A9 pin. The command sequence is illustrated in Table 7 (refer to Autoselect Command section). A0 = VIL represents the manufacturer’s code (Fujitsu = 04H) and A0 = VIH the device identifier code (MBM29F400TC = 23H and MBM29F400BC = ABH for ×8 mode; MBM29F400TC = 2223H and MBM29F400BC = 22ABH for ×16 mode). These two bytes/words are given in the tables 4.1 and 4.2. 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 Tables 4.1 and 4.2). |
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