AT27LV520(1998) View Datasheet(PDF) - Atmel Corporation

Part Name

Description

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AT27LV520
(Rev.:1998)

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

Atmel Corporation 

Atmel’s innovative design techniques provide fast speeds

that rival 5V parts while keeping the low power consump-

tion of a 3.3V supply. At VCC = 3.0V, any byte can be

accessed in less than 90 ns. With a typical power dissipa-

tion of only 18 mW at 5 MHz and VCC = 3.3V, the

AT27LV520 consumes less than one fifth the power of a

standard 5V EPROM. Standby mode is acheived by assert-

ing ALE high. Standby mode supply current is typically less

than 1 µA at 3.3V.

The AT27LV520 operating with VCC at 3.0V produces TTL

level outputs that are compatible with standard TTL logic

devices operating at VCC = 5.0V. The device is also capa-

ble of standard 5-volt operation making it ideally suited for

dual supply range systems or card products that are plug-

gable in both 3-volt and 5-volt hosts.

Atmel’s AT27LV520 has additional features to ensure high

quality and efficient production use. The Rapid™ Program-

ming Algorithm reduces the time required to program the

part and guarantees reliable programming. Programing

time is typically only 50 µs/byte. The Integrated Product

Identification Code electronically identifies the device and

manufacturer. This feature is used by industry standard

programming equipment to select the proper programming

algorithms and voltages. The AT27LV520 programs exactly

the same way as a standard 5V AT27C520 and uses the

same programming equipment.

System Considerations

Switching under active conditions may produce transient

voltage excursions. Unless accommodated by the system

design, these transients may exceed data sheet 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 termi-

nals of the device, as close to the device as possible. Addi-

tionally, to stabilize the supply voltage level on printed cir-

cuit boards with large EPROM arrays, a 4.7 µF bulk elec-

trolytic 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.

Block Diagram

VCC

GND

OE/VPP

ALE

AD7 - AD0

A15 - A8

OE, ALE, AND

PROGRAM LOGIC

Y DECODER

X DECODER

8

8

OUTPUT

BUFFERS

Y-GATING

CELL MATRIX

IDENTIFICATION

2

AT27LV520

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