MBM29F800BA Fujitsu Media Devices, MBM29F800BA Datasheet - Page 10

• Manufacturer Part Number: MBM29F800BA
• Description: 8M (1M X 8/512K X 16) BIT
• Manufacturer: Fujitsu Media Devices

10
MBM29F800TA
Read Mode
Standby Mode
Output Disable
Autoselect
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 (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 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 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
(CE = “H” or “L”). Under this condition the current is consumed is less than 5 A. A TTL standby mode is achieved
with RESET pin held at V
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.
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
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 A
command sequence is illustrated in Table 7 (refer to Autoselect Command section).
Byte 0 (A
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 DQ
device codes when executing the autoselect, A
FUNCTIONAL DESCRIPTION
0
= V
IL
CE
CE
) represents the manufacturer’s code (Fujitsu = 04H) and 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.
IH
CC
ACC
. Under this condition the current is reduced to approximately 1mA. During Embedded
IL
Active current (I
, (CE= “H” or “L”). Under this condition the current required is reduced to approximately
) is equal to the delay from stable addresses to valid output data. The chip enable
-55/-70/-90
0
, A
1
, A
IH
ACC
CC2
), output from the device is disabled. This will cause the output pins
6
, and A
) is required even CE = V
- t
/MBM29F800BA
CE
1
time).
must be V
-1
(See Tables 4.1).
7
IL
defined as the parity bit. In order to read the proper
(See Tables 4.1 and 4.2).
ID
(11.5 V to 12.5 V) on address pin A
IH
. The device can be read with standard
0
= V
IH
represents the device identifier
-55/-70/-90
0
from V
IL
SS
to V
9
pin. The
± 0.3 V
CC
IH
9
± 0.3 V.
. Two
. All