AT27C520 View Datasheet(PDF) - Atmel Corporation

Part Name

Description

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AT27C520

512K (64K x 8) Multiplexed Addresses/ Outputs OTP EPROM

Atmel Corporation 

AT27C520

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

Maximum Ratings” may cause permanent dam-

age to the device. This is a stress rating only and

functional operation of the device at these or any

other conditions beyond those indicated in the

operational 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 under-

shoot to -2.0V for pulses of less than 20 ns. Max-

imum output pin voltage is VCC + 0.75V DC

which may overshoot to +7.0V for pulses of less

than 20 ns.

Operating Modes

Mode/Pin

ALE

OE/VPP

A8 - A15

AD0 - AD7

Read

Output Disable

VIL

VIL

Ai

DOUT

VIL/VIH

VIH

X(1)

High Z/A0 - A7

Address Latch Enable

Rapid Program(2)

Product Identification(3)

Notes: 1. X can be VIL or VIH.

2. Refer to Programming Characteristics.

VIH

VIH

X

A0 - A7

VIH

VPP

Ai

DIN

A9 = VH(4)

VIL

VIL

A8 = VIH or VIL

Identification Code

A10 - A15 = VIL

3. VH = 12.0 ± 0.5V.

4. Two identifier bytes may be selected. All A8 - A15 inputs are held low (VIL), except A9 which is set to VH and A8 which is

toggled low (VIL) to select the Manufacturer’s Identification byte and high (VIH) to select the Device Code byte.

3

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