X84256

Preliminary

5

—Write ‘1’—when reading data

—Read/Read/Write ‘1’—after data is written to device,

but before entering the NV write sequence.

—the device powers-up;

—a nonvolatile write operation completes.

While a sequential read is in progress, the device remains

in an active state. This state draws more current than the

idle state, but not as much as during a read itself. To go

back to the lowest power condition, an invalid condition is

created by writing a ‘1’ after the last bit of a read operation.

Write Protection

The following circuitry has been included to prevent

inadvertent nonvolatile writes:

—A special “start nonvolatile write” command sequence

is required to start a nonvolatile write cycle.

ABSOLUTE MAXIMUM RATINGS*

Temperature under Bias ...................... –65°C to +135°C

Storage Temperature ........................... –65°C to +150°C

Terminal Voltage with

DC Output Current................................................... 5mA

Lead Temperature (Soldering, 10 seconds)..........300°C

RECOMMENDED OPERATING CONDITIONS

*COMMENT

Stresses above those listed under “Absolute Maximum

Ratings” may cause permanent damage to the device.

This is a stress rating only and the functional operation

of the device at these or any other conditions above

those indicated in the operational sections of this speci-

fication is not implied. Exposure to absolute maximum

rating conditions for extended periods may affect device

reliability.

Temperature

Min.

Max.

Commercial

0°C

+70°C

Industrial

–40°C

+85°C

Military†

–55°C

+125°C

Supply Voltage

Limits

X84256

5V

±10%

X84256 – 2.5

2.5V to 5.5V

X84256 – 1.8

1.8V to 3.6V

(Over the recommended operating conditions, unless otherwise specified.)

Symbol

Parameter

Limits

Units

Test Conditions

Min.

Max.

1

mA

I/O = Open, CE clocking @ 10MHz

3mA

All Inputs at CMOS Levels

1

µA

Input Leakage Current

10

µA

Output Leakage Current

10

µA

(1)

Input LOW Voltage

–0.5

V

(1)

Input HIGH Voltage

V

Output LOW Voltage

0.4

V

Output HIGH Voltage

V