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MBM29F080AC-90PTN Datasheet(PDF) 10 Page - Fujitsu Component Limited.

Part # MBM29F080AC-90PTN
Description  8M (1M X 8) BIT
Download  47 Pages
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Manufacturer  FUJITSU [Fujitsu Component Limited.]
Direct Link  http://edevice.fujitsu.com/fmd/en/index.html
Logo FUJITSU - Fujitsu Component Limited.

MBM29F080AC-90PTN Datasheet(HTML) 10 Page - Fujitsu Component Limited.

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10
MBM29F080A-55/-70/-90
s FUNCTIONAL DESCRIPTION
Read Mode
The MBM29F080A 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 MBM29F080A 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 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 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
MBM29F080A 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) represents the device
identifier code for MBM29F080A = D5H. These two bytes are given in the table 3. All identifiers for manufactures
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.)
The Autoselect mode also facilitates the determination of sector group protection in the system. By performing
a read operation at the address location XX02H with the higher order address bits A17, A18 and A19 set to the
desired sector group address, the device will return 01H for a protected sector group and 00H for a non-protected
sector group.


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