ATMEL AT27LV020A-90VI, AT27LV020A-90VC, AT27LV020A-90TI, AT27LV020A-90TC, AT27LV020A-90JI Datasheet

Features

•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

•Compatible with JEDEC Standard AT27C020

•Low Power CMOS Operation

20 μA max. (less than 1 μA typical) Standby for VCC = 3.6V

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

•JEDEC Standard Packages 32-Lead PLCC

32-Lead TSOP (8 X 20 mm)

32-Lead VSOP (8 x 14 mm)

•High Reliability CMOS Technology 2,000V ESD Protection

200 mA Latchup Immunity

•Rapid™ Programming Algorithm - 100 μs/byte (typical)

•Two-Line Control

•CMOS and TTL Compatible Inputs and Outputs JEDEC Standard for LVTTL

•Integrated Product Identification Code

•Commercial and Industrial Temperature Ranges

Description

The AT27LV020A is a high performance, low power, low voltage 2,097,152 bit onetime programmable read only memory (OTP EPROM) organized as 256K by 8 bits. It requires only one supply in the range of 3.0 to 3.6V in normal read mode operation, making it ideal for fast, portable systems using battery power.

Pin Configurations

Pin Name

Function

A0 - A17

Addresses

O0 - O7

Outputs

Chip Enable

CE

Output Enable

OE

Program Strobe

PGM

PLCC, Top View

TSOP, VSOP Top View

Type 1

2 Megabit

(256K x 8) Low Voltage OTP EPROM

AT27LV020A

0549B-A–9/97

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Atmel's innovative design techniques provide fast speeds that rival 5V parts while keeping the low power consumption of a 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 AT27LV020A consumes less than one fifth the power of a standard 5V EPROM. Standby mode supply current is typically less than 1 μA at 3.3V.

The AT27LV020A is available in industry standard JEDEC approved one-time programmable (OTP) plastic PLCC, TSOP and VSOP packages. All devices feature two-line control (CE, OE) to give designers the flexibility to prevent bus contention.

The AT27LV020A 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 AT27LV020A 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. Programming time is typically only 100 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 AT27LV020A programs exactly the same way as a standard 5V AT27C020 and uses the same programming equipment.

System Considerations

Switching between active and standby conditions via the Chip Enable pin 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.

2 AT27LV020A

AT27LV020A

Block Diagram

Absolute Maximum Ratings*

Temperature Under Bias

.................................. -40°C to +85°C

Storage Temperature

-65°C to +125°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

*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 be exceeded if certain precautions are observed (consult application notes) and which may overshoot to +7.0 volts for pulses of less than 20 ns.

Operating Modes

Mode \ Pin

CE

OE

PGM

Ai

VPP

VCC

Outputs

Read (2)

V

IL

V

IL

X (1)

Ai

X

V

(2)

D

OUT

CC

Output Disable (2)

X

V

X

X

X

V

(2)

High Z

IH

CC

Standby (2)

V

IH

X

X

X

X

V

(2)

High Z

CC

Rapid Program (3)

VIL

VIH

VIL

Ai

VPP

VCC

(3)

DIN

PGM Verify (3)

VIL

VIL

VIH

Ai

VPP

VCC

(3)

DOUT

PGM Inhibit (3)

VIH

X

X

X

VPP

VCC

(3)

High Z

A9 = V

(4)

Product Identification (3, 5)

H

(3)

VIL

VIL

X

A0 = VIH or VIL

X

VCC

Identification Code

A1 - A17 = 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. Programming modes require VCC = 6.5V.

4.VH = 12.0 ± 0.5V.

5.Two identifier bytes may be selected. All Ai 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 byte and high (VIH) to select the Device Code byte.

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