Rainbow Electronics AT27LV520 User Manual

Features

• 8-bit Multiplexed Addresses/Outputs

• Fast Read Access Time – 70 ns

• Dual Voltage Range Operation

– Low-voltage Power Supply Range, 3.0V to 3.6V, or
– Standard 5V ± 10% Supply Range

• Pin Compatible with Standard AT27C520

• Low-power CMOS Operation

– 20 µA max. Standby for ALE = VIH and VCC = 3.6V
– 29 mW max. Active at 5 MHz for VCC = 3.6V

• JEDEC Standard Packages

– 20-lead TSSOP
– 20-lead SOIC

• High-reliability CMOS Technology

– 2,000V ESD Protection
– 200 mA Latch-up Immunity

• Rapid

™

Programming Algorithm – 50 µs/Byte (Typical)

• CMOS- and TTL-compatible Inputs and Outputs

– JEDEC Standard for LVTTL

• Integrated Product Identification Code

• Commercial and Industrial Temperature Range

Description

The AT27LV520 is a low-power, high-performance, 524,288-bit one-time programma­ble read-only memory (OTP EPROM) organized 64K by eight bits. It incorporates
latches for the eight lower order address bits to multiplex with the eight data bits. This
minimizes system chip count, reduces cost, and simplifies the design of multiplexed
bus systems. It requires only one power supply in the range of 3.0V to 3.6V for normal
read mode operation, making it ideal for fast, portable systems using battery power.
Any byte can be accessed in less than 70 ns.

The AT27LV520 is available in 173 mil, 20-lead TSSOP and 300 mil, 20-lead SOIC,
one-time programmable (OTP) plastic packages.

(continued)

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

AT27LV520

Pin Configurations

Pin Name Function

A8 - A15 Addresses

AD0 - AD7 Addresses/Outputs

OE

/VPP Output Enable/Program Supply

ALE Address Latch Enable

TSSOP Top View

1

A10
A12
A14
ALE

VCC

OE/VPP

A15
A13
A11

A9

20
2
3
4
5
6
7
8
9
10

A8

19

AD1

18

AD3

17

AD5

16

AD7

15

GND

14

AD6

13

AD4

12

AD2

11

AD0

SOIC Top View

OE/VPP

A15
A13
A11

A9
AD0
AD2
AD4
AD6

GND

1

20
2
3
4
5
6
7
8
9
10

VCC

19

ALE

18

A14

17

A12

16

A10

15

A8

14

AD1

13

AD3

12

AD5

11

AD7

Rev. 0911D–05/00

1

Atmel’s innovative design techniques provide fast speeds
that rival 5V parts while keeping the low power consump­tion of a 3.3V supply. At V

= 3.0V, any byte can be

CC

accessed in less than 70 ns. With a typical power dissipa­tion of only 18 mW at 5 MHz and V

= 3.3V, the

CC

AT27LV520 consumes less than one fifth the power of a
standard 5V EPROM. Standby mode is achieved by assert­ing ALE high. Standby mode supply current is typically less
than 1 µA at 3.3V.

The AT27LV520 operating with V

at 3.0V produces TTL

CC

level outputs that are compatible with standard TTL logic
devices operating at V

= 5.0V. The device is also capa-

CC

ble of standard 5-volt operation making it ideally suited for
dual supply range systems or card products that are plug­gable in both 3-volt and 5-volt hosts.

Atmel’s AT27LV520 has additional features to ensure high
quality and efficient production use. The Rapid

™

Program­ming 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

Block Diagram

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 V
nals 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 V

and Ground terminals. This capacitor

CC

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

and Ground termi-

CC

VCC

GND

OE/VPP

ALE

AD7 - AD0

A15 - A8

OE, ALE, AND

PROGRAM LOGIC

Y DECODER

LATCHES

8

X DECODER

8

OUTPUT

BUFFERS

Y-GATING

CELL MATRIX

IDENTIFICATION

2

AT27LV520

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

Voltage on A9 with

Respect to Ground ......................................-2.0V to +14.0V

AT27LV520

*NOTICE: Stresses beyond those listed under “Absolute

Maximum Ratings” may cause permanent dam­age to the device. This is a stress rating only and
functional operation of the device at these or any

(1)

(1)

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.

VPP Supply Voltage with

Respect to Ground .......................................-2.0V to +14.0V

(1)

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

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

V

CC

Operating Modes

Mode/Pin ALE OE/V

(2)

Read

Output Disable

(2)

Standby V

Address Latch Enable

Rapid Program

Product Identification

Notes: 1. X can be VIL or V

(2)

(3)

(4)

IH.

V

VIL/V

V

V

V

IL

IH

IH

IH

IH

IL

2. Read, output disable, and standby modes require 3.0V ≤ VCC ≤ 3.6V, or 4.5V ≤ VCC ≤ 5.5V.

3. Refer to Programming Characteristics.

= 12.0 ± 0.5V.

4. V

H

5. Two identifier bytes may be selected. All A8 - A15 inputs are held low (V
gled low (V

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

IL

PP

V

IL

V

IH

V

IH

V

IH

V

PP

V

IL

IL

A8 - A15 AD0 - AD7

Ai D

(1)

X

OUT

High Z/A0 - A7

Ai A0 - A7

XA0 - A7

Ai D

A9 = V

A8 = VIH or V

A10 - A15 = V

(5)

H

IL

IL

Identification Code

IN

), except A9 which is set to VH and A8 which is tog-

3

DC and AC Operating Conditions for Read Operation

AT27LV520-70 AT27LV520-90

Operating Temp. (Case)

Com. 0°C - 70°C0°C - 70°C

Ind. -40°C - +85°C-40°C - +85°C

Supply

V

CC

5V ±=10% 5V ±=10%

DC and Operating Characteristics for Read Operation

Symbol Parameter Condition Min Max Units

V

= 3.0V to 3.6V

CC

3.0V to 3.6V 3.0V to 3.6V

I

LI

I

LO

(1)

I

SB

I

CC

V

IL

V

IH

V

OL

V

OH

V

= 4.5V to 5.5V

CC

I

LI

I

LO

(1)

I

SB

I

CC

V

IL

V

IH

V

OL

V

OH

Note: 1. VCC standby current will be slightly higher with ALE, Ai, and ADi at TTL levels.

Input Load Current VIN = 0V to V

Output Leakage Current V

= 0V to V

OUT

CC

CC

±1µA

±5µA

VCC Standby Current ALE = VCC ± 0.3V; Ai, ADi = GND/VCC ± 0.3V 20 µA

VCC Active Current f = 5 MHz, I

= 0 mA, ALE = V

OUT

IL

8mA

Input Low Voltage -0.6 0.8 V

Input High Voltage 2.0 VCC + 0.5 V

Output Low Voltage IOL = 2.0 mA 0.4 V

Output High Voltage IOH = -2.0 mA 2.4 V

Input Load Current VIN = 0V to V

Output Leakage Current V

= 0V to V

OUT

CC

CC

±1µA

±5µA

VCC Standby Current ALE = VCC ± 0.3V; Ai, ADi = GND/VCC ± 0.3V 100 µA

VCC Active Current f = 5 MHz, I

= 0 mA, ALE = V

OUT

IL

20 mA

Input Low Voltage -0.6 0.8 V

Input High Voltage 2.0 VCC + 0.5 V

Output Low Voltage IOL = 2.1 mA 0.4 V

Output High Voltage IOH = -400 µA 2.4

4

AT27LV520