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29F800 参数 Datasheet PDF下载

29F800图片预览
型号: 29F800
PDF下载: 下载PDF文件 查看货源
内容描述: 8M ( 1M ×8 / 512K ×16 )位 [8M (1M X 8/512K X 16) BIT]
分类和应用:
文件页数/大小: 48 页 / 516 K
品牌: FUJITSU [ FUJITSU ]
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MBM29F800TA-55/-70/-90/MBM29F800BA-55/-70/-90  
FUNCTIONAL DESCRIPTION  
Read Mode  
The MBM29F800TA/BA 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 MBM29F800TA/BA 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. 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. 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 500 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 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, A6, and A-1 (See Tables 4.1).  
The manufacturer and device codes may also be read via the command register, for instances when the  
MBM29F800TA/BA 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).  
Byte 0 (A0 = VIL) represents the manufacturer’s code (Fujitsu = 04H) and A0 = VIH represents the device identifier  
code (MBM29F800TA = D6H and MBM29F800BA = 58H for ×8 mode; MBM29F800TA = 22D6H and  
MBM29F800BA = 2258H for ×16 mode). These two bytes/words are given in the tables 4.1 and 4.2. All identifiers  
for manufacturers 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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