MBM29F040C Fujitsu Media Devices, MBM29F040C Datasheet - Page 9

• Manufacturer Part Number: MBM29F040C
• Description: 4M (512K X 8) BIT
• Manufacturer: Fujitsu Media Devices

Read Mode
Standby Mode
Output Disable
Autoselect
FUNCTIONAL DESCRIPTION
The MBM29F040C 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
The MBM29F040C has two standby modes, a CMOS standby mode (CE input held at V
current consumed is less than 5 µA; and a TTL standby mode (CE is held at V
reduced to approximately 1 mA. During Embedded Algorithm operation, V
CE = V
standby mode the outputs are in a high impedance state, independent of the OE input.
If the device is deselected during erasure or programming, the device will draw active current until the operation
is completed.
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
MBM29F040C is erased or programmed in a system without access to high voltage on the A
sequence is illustrated in Table 5. (Refer to Autoselect Command section.)
Byte 0 (A
identifier code (MBM29F040C = A4H). These two bytes are given in the Table 3. All identifiers for manufactures
and device will exhibit odd parity with the MSB (DQ
codes when executing the autoselect, A
IH
. The device can be read with standard access time (t
0
= V
CE
IL
) represents the manufacture’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
ACC
) is equal to the delay from stable addresses to valid output data. The chip enable
0
1
IH
ACC
, A
must be V
), output from the device is disabled. This will cause the output pins
1
-t
, and A
OE
time).
7
) defined as the parity bit. In order to read the proper device
6
IL
. (Recommend V
. (See Table 3.)
CE
MBM29F040C
ID
) from either of these standby modes. In the
(11.5 V to 12.5 V) on address pin A
IL
for the other pins.)
CC
Active current (I
IH
) when the current required is
0
= V
IH
0
) represents the device
from V
CC
9
CC2
±0.3 V.), when the
pin. The command
) is required even
IL
-55/-70/-90
to V
IH
. All
9
. Two
9