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MBM29PL65LM-90/10

s FUNCTIONAL DESCRIPTION

Standby Mode

There are two ways to implement the standby mode on the device, one using both the CE and RESET pins, and

the other via the RESET pin only.

When using both pins, CMOS standby mode is achieved with CE and RESET input held at VCC

± 0.3 V. Under

this condition the current consumed is less than 5

µA Max. During Embedded Algorithm operation, VCC active

current (ICC2) is required even when CE

= “H”. The device can be read with standard access time (tCE) from either

of these standby modes.

When using the RESET pin only, CMOS standby mode is achieved with RESET input held at VSS

± 0.3 V (CE =

“H” or “L”) .

Under this condition the current consumed is less than 5

µA Max. Once the RESET pin is set high, the device

requires tRH as a wake-up time for output to be valid for read access.

During standby mode, the output is in the high impedance state regardless of OE input.

Automatic Sleep Mode

Automatic sleep mode works to resin power consumption during read-out of the device data. This is useful in

the application such as a handy terminal which requires low power consumption.

To activate this mode, the device automatically switches itself to low power mode when address remain stable

during

access time of tACC

+ 30 ns. It is not necessary to control CE, WE and OE on this mode. The current consumed

is typically 1

µA (CMOS Level) .

During simultaneous operation, VCC active current (ICC2) is required.

Since, the data are latched during this mode, the data are continuously read out. When the addresses are

changed, the mode is automatically canceled and the device reads the data for changed address.

Autoselect

Autoselect mode allows reading out of a binary code and identifies its manufacturer and type. It 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 VID on address pin A9. Three identifier bytes may

then be sequenced from the device outputs by toggling addresses. All addresses are DON’T CARES except A6

to A0.

The manufacturer and device codes may also be read via the command register, for instances when the device

is erased or programmed in a system without access to high voltage on the A9 pin. The command sequence is

illustrated in “Common Definitions Table” of “s DEVICE BUS OPERATIONS”.

A read cycle from address 00h returns the manufacturer’s code (Fujitsu

= 04h) . A read cycle from address 01h

outputs device code. At word mode, 227Eh is output, it indicates that two additional codes, called Extended

Device Codes is required. Therefore the system may continue reading out these Extended Device Codes at

addresses of 0Eh and 0Fh. Refer to “Autoselect Codes Table” in “s DEVICE BUS OPERATIONS”.

Read Mode

The device has two control functions required to obtain data at the outputs. CE is the power control and used

for a device selection. OE is the output control and used to gate data to the output pins if a device is selected.

Address access time (tACC) is equal to the delay from stable addresses to valid output data. The chip enable

access time (tCE) is the delay from stable addresses and stable CE to valid data at the output pins. The output

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 tACC - tOE time. When reading out a data without changing addresses

after power-up, input hardware reset or to change CE pin from “H” or “L”.

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