MBM29LV800TE Fujitsu Microelectronics, Inc., MBM29LV800TE Datasheet - Page 17

• Manufacturer Part Number: MBM29LV800TE
• Description: 8m 1m X 8/512 K X 16 Bit
• Manufacturer: Fujitsu Microelectronics, Inc.

16
MBM29LV800TE/BE
Read Mode
Standby Mode
Automatic Sleep Mode
Output Disable
Autoselect
FUNCTIONAL DESCRIPTION
The MBM29LV800TE/BE have 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
time (t
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
it is necessary to input hardware reset or change CE pin from “H” or “L”
There are two ways to implement the standby mode on the MBM29LV800TE/BE 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. The device can be read with standard access time
(t
required even CE
When using the RESET pin only, a CMOS standby mode is achieved with RESET input held at V
high, the device requires t
In the standby mode, the outputs are in the high impedance state, independently of the OE input.
There is a function called automatic sleep mode to restrain power consumption during read-out of
MBM29LV800TE/BE data. This mode can be useful in the application such as handy terminal which requires
low power consumption.
To activate this mode, MBM29LV800TE/BE automatically switches themselves to low power mode when
MBM29LV800TE/BE addresses remain stable during access time 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) .
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 MBM29LV800TE/BE read-out the data for changed addresses.
With the OE input at a logic high level (V
pins to be in a high impedance state.
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
identifier bytes may then be sequenced from the devices outputs by toggling address A
addresses are DON’T CARES except A
Autoselect Codes” in “
The manufacturer and device codes may also be read via the command register, for instances when the
MBM29LV800TE/BE are erased or programmed in a system without access to high voltage on the A
command sequence is illustrated in “MBM29LV800TE/BE Command Definitions” in “
TION”. (Refer to Autoselect Command section.)
(CE
CE
) from either of these standby modes. During Embedded Algorithm operation, V
CE
“H” or “L”) . Under this condition the current consumed is less than 5 A. Once the RESET pin is taken
) is the delay from stable addresses and stable CE to valid data at the output pins. The output enable
“H”.
ACC
DEVICE BUS OPERATION”.)
) is equal to delay from stable addresses to valid output data. The chip enable access
RH
as wake up time for outputs to be valid for read access.
ACC
-t
OE
time) . When reading out data without changing addresses after power-up,
0
60/70/90
IH
, A
) , the output from the devices is disabled. This will cause the output
1
, A
6
, and A
-1
. (See “MBM29LV800TE/BE Sector Protection Verify
ID
(11.5 V to 12.5 V) on address pin A
CC
DEVICE BUS OPERA-
active current (I
0
from V
SS
IL
CC
to V
9
0.3 V
pin. The
9
CC2
0.3 V.
. Two
IH
. All
) is