MBM29DL324TD Fujitsu Media Devices, MBM29DL324TD Datasheet - Page 51

• Manufacturer Part Number: MBM29DL324TD
• Description: (MBM29DL32xBD) 32M (4M X 8/2M X 16) BIT Dual Operation
• Manufacturer: Fujitsu Media Devices

MBM29DL32XTD/BD
-80/90/12
• Standby Mode
There are two ways to implement the standby mode on the MBM29DL32XTD/BD 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
± 0.3 V.
CC
Under this condition the current consumed is less than 5 A max. During Embedded Algorithm operation, V
CC
active current (I
) is required even CE = “H”. The device can be read with standard access time (t
) from either
CC2
CE
of these standby modes.
When using the RESET pin only, a CMOS standby mode is achieved with RESET input held at V
± 0.3 V (CE
SS
= “H” or “L”). Under this condition the current is consumed is less than 5 A max. Once the RESET pin is taken
high, the device requires t
of wake up time before outputs are valid for read access.
RH
In the standby mode the outputs are in the high impedance state, independent of the OE input.
• Automatic Sleep Mode
There is a function called automatic sleep mode to restrain power consumption during read-out of
MBM29DL32XTD/BD data. This mode can be used effectively with an application requested low power
consumption such as handy terminals.
To activate this mode, MBM29DL32XTD/BD automatically switch themselves to low power mode when
MBM29DL32XTD/BD addresses remain stably during access fine of 150 ns. It is not necessary to control CE,
WE, and OE on the mode. Under the mode, the current consumed is typically 1 A (CMOS Level).
During simultaneous operation, V
active current (I
) is required.
CC
CC2
Since the data are latched during this mode, the data are read-out continuously. If the addresses are changed,
the mode is canceled automatically and MBM29DL32XTD/BD read-out the data for changed addresses.
• Output Disable
With the OE input at a logic high level (V
), output from the devices are disabled. This will cause the output pins
IH
to be in a high impedance state.
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• Autoselect
The autoselect mode allows the reading out of a binary code from the devices 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 devices.
To activate this mode, the programming equipment must force V
(11.5 V to 12.5 V) on address pin A
. Two
ID
9
identifier bytes may then be sequenced from the devices outputs by toggling address A
from V
to V
. All
0
IL
IH
addresses are DON’T CARES except A
, A
, and A
(A
). (See Tables 3 and 4.)
0
1
6
-1
The manufacturer and device codes may also be read via the command register, for instances when the
MBM29DL32XTD/BD are erased or programmed in a system without access to high voltage on the A
pin. The
9
command sequence is illustrated in Table 12. (Refer to Autoselect Command section.)
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