Rainbow Electronics AT27BV020 User Manual

Features

• Fast Read Access Time – 90 ns

• Dual Voltage Range Operation

– Unregulated Battery Power Supply Range, 2.7V 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 V
– 29 mW max. Active at 5 MHz for V

= 3.6V

CC

• Wide Selection of 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 Latch-up Immunity

• Rapid

™

Programming Algorithm – 100 µs/Byte (Typical)

• CMOS and TTL Compatible Inputs and Outputs

– JEDEC Standard for LVTTL and LVBO

• Integrated Product Identification Code

• Commercial and Industrial Temperature Ranges

Description

= 3.6V

CC

2-megabit
(256K x 8)
Unregulated

Battery-Voltage

High-speed
OTP EPROM

™

The AT27BV020 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 2.7 to 3.6V in normal read mode operation,
making it ideal for fast, portable systems using either regulated or unregulated battery
power.

(continued)

Pin Configurations

Pin Name Function

A0 - A17 Addresses

O0 - O7 Outputs

CE

OE

PGM

NC No Connect

5

A7

6

A6

7

A5

8

A4

9

A3

10

A2

11

A1

12

A0

13

O0

Chip Enable

Output Enable

Program Strobe

PLCC, Top View

A12

A15

A16

VPP

VCC

PGM

432

1

323130

14151617181920

O1

O2

O3O4O5

GND

A17

29
28
27
26
25
24
23
22
21

O6

A14
A13
A8
A9
A11
OE
A10
CE
O7

A11

A13
A14
A17

PGM

VCC
VPP

A16
A15
A12

TSOP, VSOP Top View

Type 1

1
2

A9

3

A8

4
5
6
7
8
9
10
11
12
13

A7

14

A6

15

A5

16

A4

OE

32

A10

31

CE

30

O7

29

O6

28

O5

27

O4

26

O3

25

GND

24

O2

23

O1

22

O0

21

A0

20

A1

19

A2

18

A3

17

AT27BV020

Rev. 0902D–04/01

1

Atmel’s innovative design techniques provide fast speeds
that rival 5V parts while keeping the low power consump­tion of a 3V supply. At V

= 2.7V, any byte can be

CC

accessed in less than 90 ns. With a typical power dissipa­tion of only 18 mW at 5 MHz and V

= 3V, the AT27BV020

CC

consumes less than one fifth the power of a standard 5V
EPROM. Standby mode supply current is typically less
than 1 µA at 3V. The AT27BV020 simplifies system design
and stretches battery lifetime even further by eliminating
the need for power supply regulation

The AT27BV020 is available in industry standard JEDEC
approved one-time programmable (OTP) plastic PLCC,
TSOP and VSOP packages, as well as a 42-ball, 1 mm
pitch. All devices feature two-line control (CE

, OE) to give

designers the flexibility to prevent bus contention.

The AT27BV020 operating with V

at 3.0V produces TTL

CC

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

= 5.0V. At VCC = 2.7V, the part is

CC

compatible with JEDEC approved low voltage battery oper­ation (LVBO) interface specifications. 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 AT27BV020 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. 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 AT27BV020 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
nonconformance. 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
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
terminals. This capacitor should be positioned as close as
possible to the point where the power supply is connected
to the array.

and Ground terminals of the device, as

CC

and Ground

CC

Block Diagram

2

AT27BV020

Absolute Maximum Ratings*

Temperature under Bias .................................. -40°C to +85°C

Storage Temperature..................................... -65°C to +125°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

AT27BV020

*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

V

+ 0.75V DC which may be exceeded if certain precautions are observed (consult application notes) and which may

CC

overshoot to +7.0V for pulses of less than 20 ns.

Operating Modes

Mode / Pin CE OE PGM Ai V

(2)

Read

Output Disable

Standby

Rapid Program

PGM Verify

PGM Inhibit

(2)

(2)

(3)

(3)

(3)

Product Identification

(3)(5)

V

IL

X V

V

IH

V

IL

V

IL

V

IH

V

IL

V

IL

IH

XXXXV

V

IH

V

IL

XX X VPPV

V

IL

(1)

X

Ai X V

XXXV

V

IL

V

IH

X

Ai V

Ai V

A9 = V

(4)

H

A0 = VIH or V

A1 - A17 = V

IL

IL

Notes: 1. X Can be VIL or VIH.

2. Read, output disable, and standby modes require, 2.7V ≤ V

3. Refer to Programming Characteristics. Programming modes requires V
= 12.0 ± 0.5V.

4. V

H

5. Two identifier bytes may be selected. All Ai inputs are held low (V

low (V

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

IL

≤ 3.6V, or 4.5V ≤ VCC ≤ 5.5V.

CC

IL

= 6.5V.

CC

), except A9 which is set to VH and A0 which is toggled

PP

PP

PP

XV

V

CC

CC

CC

VCC

V

CC

CC

CC

CC

(2)

(2)

(2)

(3)

(3)

(3)

(3)

Outputs

D

OUT

High-Z

High-Z

D

IN

D

OUT

High-Z

Identification
Code

3

DC and AC Operating Conditions for Read Operation

AT27BV020-90 AT27BV020-12 AT27BV020-15

Operating Temperature
(Case)

Com. 0°C - 70°C0°C - 70°C0°C - 70°C

Ind. -40°C - 85°C-40°C - 85°C-40°C - 85°C

Power Supply

V

CC

5V ± 10% 5V ± 10% 5V ± 10%

DC and Operating Characteristics for Read Operation

Symbol Parameter Condition Min Max Units

V

= 2.7V to 3.6V

CC

2.7V to 3.6V 2.7V to 3.6V 2.7V to 3.6V

I

LI

I

LO

(2)

I

PP1

I

SB

I

CC

V

IL

V

IH

V

OL

V

OH

= 4.5V to 5.5V

V

CC

I

LI

I

LO

(2)

I

PP1

I

SB

I

CC

V

IL

V

IH

V

OL

V

OH

Notes: 1. V

2. V

Input Load Current VIN = 0V to V

Output Leakage Current V

(1)

V

Read/Standby Current VPP = V

PP

(1)

V

Standby Current

CC

OUT

(CMOS), CE = V

I

SB1

(TTL), CE = 2.0 to VCC + 0.5V 100 µA

I

SB2

VCC Active Current f = 5 MHz, I

= 3.0 to 3.6V -0.6 0.8 V

V

Input Low Voltage

Input High Voltage

Output Low Voltage

Output High Voltage

CC

= 2.7 to 3.6V -0.6 0.2 x V

V

CC

V

= 3.0 to 3.6V 2.0 VCC + 0.5 V

CC

= 2.7 to 3.6V 0.7 x V

V

CC

= 2.0 mA 0.4 V

I

OL

I

= 100 µA 0.2 V

OL

= 20 µA 0.1 V

I

OL

= -2.0=mA 2.4 V

I

OH

I

= -100 µA V

OH

= -20 µA V

I

OH

Input Load Current VIN = 0V to V

Output Leakage Current V

(1)

V

Read/Standby Current VPP = V

PP

(1)

VCC

Standby Current

OUT

I

(CMOS), CE = VCC ± 0.3V 100 µA

SB1

(TTL), CE = 2.0 to VCC + 0.5V 1 mA

I

SB2

VCC Active Current f = 5 MHz, I

= 0V to V

CC

OUT

= 0V to V

CC

OUT

CC

CC

± 0.3V 20 µA

CC=

= 0 mA, CE = VIL, VCC = 3.6V 8 mA

CC

- 0.2 V

CC

- 0.1 V

CC

CC

CC

= 0 mA, CE = V

IL

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 V

must be applied simultaneously with or before VPP, and removed simultaneously with or after VPP.

CC

may be connected directly to VCC, expect during programming. The supply current would then be the sum of ICC and IPP.

PP

±1µA

±5µA

10 µA

CC

VCC + 0.5 V

±1µA

±5µA

10 µA

25 mA

V

4

AT27BV020