ATMEL AT27LV520-90XI, AT27LV520-90TI, AT27LV520-90TC, AT27LV520-90SC, AT27LV520-90CI Datasheet

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ATMEL AT27LV520-90XI, AT27LV520-90TI, AT27LV520-90TC, AT27LV520-90SC, AT27LV520-90CI Datasheet

Features

 

 

 

 

 

 

 

8-Bit Multiplexed Addresses/Outputs

 

 

 

 

 

 

Fast Read Access Time - 90 ns

 

 

 

 

 

 

 

Dual Voltage Range Operation

 

 

 

 

 

 

 

– Low-Voltage Power Supply Range, 3.0V to 3.6V, or

 

 

 

 

 

– Standard 5V ± 10% Supply Range

 

 

 

 

 

Low Power CMOS Operation

 

 

 

 

 

 

 

– 20 μA max. Standby for ALE = VIH and VCC = 3.6V

 

 

 

 

 

– 29 mW max. Active at 5 MHz for V CC = 3.6V

 

 

 

 

 

20-Lead TSSOP Package

 

 

 

 

 

 

512K (64K x 8)

High Reliability CMOS Technology

 

 

 

 

 

 

– 2,000V ESD Protection

 

μs/byte (typical)

 

 

 

 

Multiplexed

RapidProgramming Algorithm - 50

 

 

 

 

– 200 mA Latchup Immunity

 

 

 

 

 

 

 

CMOS and TTL Compatible Inputs and Outputs

 

 

 

 

Addresses/

– JEDEC Standard for LVTTL

 

 

 

 

 

 

Integrated Product Identification Code

 

 

 

 

Outputs

Commercial and Industrial Temperature Range

 

 

 

 

Description

 

 

 

 

 

 

Low Voltage

The AT27LV520 is a low-power, high-performance 524,288-bit one-time programma-

OTP EPROM

 

ble read only memory (OTP EPROM) organized 64K by 8 bits. It incorporates latches

 

for the 8 lower order address bits to multiplex with the 8 data bits. This minimizes sys-

 

tem chip count, reduces cost, and simplifies the design of multiplexed bus systems. It

AT27LV520

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 90 ns.

 

 

 

 

 

 

 

The AT27LV520 is available in 173 mil, 20-pin TSSOP, 300 mil, 20-pin SOIC and 28-

 

pin TSOP, one-time programmable (OTP) plastic packages.

 

 

(continued)

 

Pin Configurations

 

 

 

 

 

 

 

 

TSSOP Top View

 

 

 

 

 

 

Pin Name

Function

 

 

 

 

 

 

 

A8 - A15

Addresses

 

 

A10

1

20

A8

 

 

 

A12

2

19

AD1

 

AD0 - AD7

Addresses/Outputs

 

 

A14

3

18

AD3

 

 

 

ALE

4

17

AD5

 

OE /VPP

Output Enable/VPP

 

 

VCC

5

16

AD7

 

 

 

OE/VPP

6

15

GND

 

 

 

 

 

 

 

 

 

 

A15

7

14

AD6

 

ALE

Address Latch Enable

 

A13

8

13

AD4

 

 

 

 

 

A11

9

12

AD2

 

 

 

 

 

A9

10

11

AD0

 

 

TSOP Top View

 

 

 

 

 

 

 

A10

22

21

A8

 

SOIC Top View

 

NC

23

20

NC

 

 

 

 

 

NC

24

19

NC

 

 

 

 

 

A12

25

18

AD1

OE/VPP

1

20

VCC

 

A14

26

17

AD3

 

A15

2

19

ALE

 

ALE

27

16

AD5

 

A13

3

18

A14

 

VCC

28

15

AD7

 

A11

4

17

A12

 

OE/VPP

1

14

GND

 

A9

5

16

A10

 

A15

2

13

AD6

 

AD0

6

15

A8

 

A13

3

12

AD4

 

AD2

7

14

AD1

 

A11

4

11

AD2

 

AD4

8

13

AD3

 

NC

5

10

NC

 

AD6

9

12

AD5

 

NC

6

9

NC

 

GND

10

11

AD7

 

A9

7

8

AD0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Rev. 0911B-B–01/98

 

 

 

 

 

 

 

 

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 VCC = 3.0V, any byte can be accessed in less than 90 ns. With a typical power dissipation of only 18 mW at 5 MHz and VC C = 3.3V, the AT27LV520 consumes less than one fifth the power of a standard 5V EPROM. Standby mode is acheived by asserting 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 capable 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 RapidProgramming 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 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.

Block Diagram

VCC

 

 

8

GND

 

 

 

OE/VPP

 

OE, ALE, AND

OUTPUT

ALE

PROGRAM LOGIC

BUFFERS

 

 

 

 

LATCHES

Y DECODER

Y-GATING

AD7 - AD0

 

 

 

X DECODER

CELL MATRIX

 

8

A15 - A8

 

 

 

 

 

 

 

 

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

-2.0V to +7.0V(1)

Respect to Ground ........................................

Voltage on A9 with

-2.0V to +14.0V(1)

Respect to Ground .....................................

VPP Supply Voltage with

-2.0V to +14.0V(1)

Respect to Ground ......................................

 

 

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 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 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.

Operating Modes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Mode/Pin

ALE

OE/VPP

A8 - A15

 

AD0 - AD7

Read(2)

 

V

IL

 

V

Ai

 

 

D

OUT

 

 

 

 

 

 

 

IL

 

 

 

 

 

Output Disable(2)

V

IL

/V

 

V

IH

X(1)

 

High Z/A0 - A7

 

 

 

IH

 

 

 

 

 

 

 

 

 

 

Standby

 

VIH

 

VIH

Ai

 

 

A0 - A7

Address Latch Enable(2)

 

V

 

 

V

IH

X

 

 

A0 - A7

 

 

 

IH

 

 

 

 

 

 

 

 

 

 

Rapid Program(3)

 

V

 

 

V

PP

Ai

 

 

D

IN

 

 

 

IH

 

 

 

 

 

 

 

 

Product Identification(4)

 

 

 

 

 

 

 

 

A9 = VH(5)

 

 

 

 

 

V

IL

 

V

A8 = V

IH

or V

IL

Identification Code

 

 

 

 

 

 

 

IL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A10 - A15 = VIL

 

 

 

Notes: 1. X can be VIL or VIH.

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

3.Refer to Programming Characteristics.

4.VH = 12.0 ± 0.5V.

5.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.

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