AT27C256R-45PI(2007) Ver la hoja de datos (PDF) - Atmel Corporation

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componentes Descripción

Fabricante

AT27C256R-45PI
(Rev.:2007)

256K (32K x 8) OTP EPROM

Atmel Corporation 

AT27C256R

3. System Considerations

Switching between active and standby conditions via the Chip Enable pin may produce tran-

sient voltage excursions. Unless accommodated by the system design, these transients may

exceed datasheet limits, resulting in device non-conformance. At a minimum, a 0.1 µF high

frequency, low inherent inductance, ceramic capacitor should be utilized for each device. This

capacitor should be connected between the VCC and Ground terminals of the device, as close

to the device as possible. Additionally, to stabilize the supply voltage level on printed circuit

boards with large EPROM arrays, a 4.7 µF bulk electrolytic capacitor should be utilized, again

connected between the VCC and Ground terminals. This capacitor should be positioned as

close as possible to the point where the power supply is connected to the array.

4. Block Diagram

5. Absolute Maximum Ratings*

Temperature Under Bias................................ -55°C to +125°C

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

Voltage on Any Pin with

Respect to Ground .........................................-2.0V to +7.0V(1)

Voltage on A9 with

Respect to Ground ......................................-2.0V to +14.0V(1)

VPP Supply Voltage with

Respect to Ground .......................................-2.0V to +14.0V(1)

*NOTICE:

Stresses beyond those listed under “Absolute Maxi-

mum Ratings” may cause permanent damage to

the device. This is a stress rating only and func-

tional operation of the device at these or any other

conditions beyond those indicated in the opera-

tional sections of this specification is not implied.

Exposure to absolute maximum rating conditions

for extended periods may affect device reliability.

Note: 1. Minimum voltage is -0.6V DC which may undershoot to -2.0V for pulses of less than 20 ns.Maximum output pin voltage is

VCC + 0.75V dc which may overshoot to +7.0 volts for pulses of less than 20 ns.

3

0014M–EPROM–12/07

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