MBM29F002BC Fujitsu Media Devices, MBM29F002BC Datasheet - Page 9

• Manufacturer Part Number: MBM29F002BC
• Description: 2M (256K X 8) BIT
• Manufacturer: Fujitsu Media Devices

Read Mode
Standby Mode
Output Disable
Autoselect
FUNCTIONAL DESCRIPTION
The MBM29F002TC/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 (t
access time (t
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 t
There are two ways to implement the standby mode on the MBM29F002TC/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 V
Under this condition the current consumed is less than 5 A. A TTL standby mode is achieved with CE and
RESET pins held at V
Algorithm operation, V
access time (t
When using the RESET pin only, a CMOS standby mode is achieved with RESET input held at V
= “H” or “L”). Under this condition the current consumed is less than 5 A. A TTL standby mode is achieved with
RESET pin held at V
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.
With the OE input at a logic high level (V
to be in a high impedance state.
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 V
identifier bytes may then be sequenced from the device outputs by toggling address A
addresses are don't cares except A
The manufacturer and device codes may also be read via the command register, for instances when the
MBM29F002TC/BC is erased or programmed in a system without access to high voltage on the A
command sequence is illustrated in Table 6. (Refer to Autoselect Command section.)
Byte 0 (A
identifier code for MBM29F002TC = B0H, MBM29F002BC = 34H. These two bytes are given in the table 3. All
identifiers for manufactures and device will exhibit odd parity with DQ
the proper device codes when executing the Autoselect, A
The Autoselect mode also facilitates the determination of sector protection in the system. By performing a read
operation at the address location XX02H with the higher order address bits A
desired sector address, the device will return 01H for a protected sector and 00H for a non-protected sector.
0
MBM29F002TC
= V
IL
CE
CE
) represents the manufacturer's code (Fujitsu = 04H) and byte 1 (A
) is the delay from stable addresses and stable CE to valid data at the output pins. The output
) from either of these standby modes.
IL
IH
CC
(CE = “H” or “L”). Under this condition the current required is reduced to approximately
ACC
. Under this condition the current is reduced to approximately 1 mA. During Embedded
Active current (I
) is equal to the delay from stable addresses to valid output data. The chip enable
0
, A
1
, A
IH
ACC
CC2
), output from the device is disabled. This will cause the output pins
6
-t
-55/-70/-90
) is required even CE = V
and A
OE
time).
10
. (See Table 3.)
1
/MBM29F002BC
must be V
ID
(11.5 V to 12.5 V) on address pin A
7
IH
defined as the parity bit. In order to read
IL
. The device can be read with standard
. (See Table 3.)
13
, A
0
14
= V
, A
IH
15
0
) represents the device
, A
from V
16
and A
IL
-55/-70/-90
to V
SS
9
17
±0.3 V (CE
pin. The
IH
set to the
CC
. All
9
. Two
±0.3 V.
9