MBM29F400BC-55PF SPANSION [SPANSION], MBM29F400BC-55PF Datasheet - Page 13

• Manufacturer Part Number: MBM29F400BC-55PF
• Description: FLASH MEMORY CMOS 4M (512K x 8/256K x 16) BIT
• Manufacturer: SPANSION [SPANSION]

12
MBM29F400TC
Read Mode
Standby Mode
Output Disable
Autoselect
FUNCTIONAL DESCRIPTION
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 (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 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 V
Under this condition the current consumed is less than 5 A max. 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
(CE = “H” or “L”). Under this condition the current is consumed is less than 5 A max. A TTL standby mode is
achieved with RESET pin held at V
approximately 1mA. Once the RESET pin is taken high, the device requires t
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 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 V
identifier bytes may then be sequenced from the devices outputs by toggling address A
addresses are don't cares except A
Autoselect Codes” in DEVICE BUS OPERATION).
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 A
command sequence is illustrated in “MBM29F400TC/BC Command Definitions” in DEVICE BUS OPERATION
(refer to Autoselect Command section).
A
= 23h and MBM29F400BC = ABh for 8 mode; MBM29F400TC = 2223h and MBM29F400BC = 22ABh for 16
mode). These two bytes/words are given in “MBM29F400TC/BC Sector Protection Verify Autoselect Codes” and
“Expanded Autoselect Code Table” in DEVICE BUS OPERATION. All identifiers for manufacturer and device
will exhibit odd parity with DQ
the autoselect, A
“Expanded Autoselect Code Table” in DEVICE BUS OPERATION).
0
= V
IL
represents the manufacturer’s code (Fujitsu = 04h) and A
CE
CE
) is the delay from stable addresses and stable CE to valid data at the output pins. The output
) from either of these standby modes.
1
must be V
IH
CC
ACC
. Under this condition the current is reduced to approximately 1mA. During Embedded
Active current (I
) is equal to the delay from stable addresses to valid output data. The chip enable
IL
7
-55/-70-90
defined as the parity bit. In order to read the proper device codes when executing
(See “MBM29F400TC/BC Sector Protection Verify Autoselect Codes” and
IL
0
, (CE= “H” or “L”). Under this condition the current required is reduced to
, A
1
and A
IH
ACC
CC2
), output from the device is disabled. This will cause the output pins
) is required even CE = V
- t
CE
6
time).
( A
/MBM29F400BC
-1
) (See “MBM29F400TC/BC Sector Protection Verify
0
= V
ID
(11.5 V to 12.5 V) on address pin A
IH
the device identifier code (MBM29F400TC
IH
. The device can be read with standard
RH
of wake up time before outputs
-55/-70-90
0
from V
IL
SS
to V
9
pin. The
± 0.3 V
CC
IH
9
± 0.3 V.
. Two
. All