AT27C400-70 datasheet(3/10 Pages) ATMEL

Part #	AT27C400-70

Description	4-Megabit 256K x 16 or 512K x 8 OTP EPROM

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Manufacturer	ATMEL [ATMEL Corporation]

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AT27C400

3

Block Diagram

Absolute Maximum Ratings*

Temperature Under Bias ...................... -55

°C to +125°C

*NOTICE:

Stresses beyond those listed under “Absolute Maxi-

mum Ratings” may cause permanent damage to the

device. This is a stress rating only and functional

operation of the device at these or any other condi-

tions beyond those indicated in the operational sec-

tions 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 undershoot to -

2.0V for pulses of less than 20 ns. Maximum output

pin voltage is VCC + 0.75V dc which may overshoot to

+7.0V for pulses of less than 20 ns.

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)

Integrated UV Erase Dose...................7258 W •sec/cm2

Operating Modes

Notes:

1.

X can be VIL or VIH.

2.

Refer to the programming characteristics tables in this data sheet.

3.

VH = 12.0 ± 0.5V.

4.

Two identifier words may be selected. All inputs are held low (VIL), except A9, which is set to VH, and A0, which is toggled

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

5.

Standby VCC current (ISB) is specified with VPP = VCC. VCC > VPP will cause a slight increase in ISB.

Outputs

Mode/Pin

CE

OE

Ai

BYTE/VPP

O0 - O7

O8 - O14

O15/A-1

Read Word-wide

VIL

X(1)

VIH

DOUT

Read Byte-wide Upper

VIL

X(1)

VIL

DOUT

High Z

VIH

Read Byte-wide Lower

VIL

X(1)

VIL

DOUT

High Z

VIL

Output Disable

X(1)

VIH

X(1)

X

High Z

Standby

VIH

X(1)

X(5)

High Z

Rapid Program(2)

VIL

VIH

Ai

VPP

DIN

PGM Verify

X

VIL

Ai

VPP

DOUT

PGM Inhibit

VIH

X(1)

VPP

High Z

Product Identification(4)

VIL

A9 = VH

(3)

A0 = VIH or VIL

A1 - A17 = VIL

VIH

Identificatio

n

Code

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AT27C400-70 Datasheet(PDF) 3 Page - ATMEL Corporation

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