Rainbow Electronics AT27LV256A User Manual

Features

• Fast Read Access Time - 55ns

• Dual Voltage Range Operation

– Low-voltage Power Supply Range, 3.0V to 3.6V

or Standard 5V ± 10% Supply Range

• Pin Compatible with JEDEC Standard AT27C256R

• Low-power CMOS Operation

– 20 µA max. (less than 1 µA typical) Standby for V
– 29 mW max. Active at 5 MHz for VCC = 3.6V

= 3.6V

CC

• JEDEC Standard Packages

– 32-lead PLCC
– 28-lead 330-mil SOIC
– 28-lead TSOP

• High-reliability CMOS Technology

– 2,000V ESD Protection
– 200 mA Latchup Immunity

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

• CMOS and TTL Compatible Inputs and Outputs

– JEDEC Standard for LVTTL

• Integrated Product Identification Code

• Commercial and Industrial Temperature Ranges

Description

The AT27LV256A is a high performance, low power, low voltage 262,144-bit one-time
programmable read only memory (OTP EPROM) organized as 32K by 8 bits. It
requires only one supply in the range of 3.0V to 3.6V in normal read mode operation,

(continued)

256K (32K x 8)
Low-voltage
OTP EPROM

AT27LV256A

Pin Configurations

Pin Name Function

A0 - A14 Addresses

O0 - O7 Outputs

CE

OE Output Enable

NC No Connect

PLCC Top View

5

A6

6

A5

7

A4

8

A3

9

A2

10

A1

11

A0

12

NC

13

O0

Note: PLCC Package Pins 1 and 17
are DON’T CONNECT.

Chip Enable

A7

A12

VPPNCVCC

A14

432

1

323130

14151617181920

O1

O2

O3O4O5

NC

GND

A13

29
28
27
26
25
24
23
22
21

A8
A9
A11
NC
OE
A10
CE
O7
O6

OE

A11

A13

A14
VCC
VPP

A12

SOIC Top View

VPP

A12

GND

A7
A6
A5
A4
A3
A2
A1
A0
O0
O1
O2

1
2
3
4
5
6
7
8
9
10
11
12
13
14

28

VCC

27

A14

26

A13

25

A8

24

A9

23

A11

22

OE

21

A10

20

CE

19

O7

18

O6

17

O5

16

O4

15

O3

TSOP Top View

Type 1

22
23
24

A9

25

A8

26
27
28
1
2
3

A7

4

A6

5

A5

6

A4

7

A3

21

A10

20

CE

19

O7

18

O6

17

O5

16

O4

15

O3

14

GND

13

O2

12

O1

11

O0

10

A0

9

A1

8

A2

Rev. 0547C–05/00

1

making it ideal for fast, portable systems using battery
power.

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 55 ns. With a typical power dissipa­tion of only 18 mW at 5 MHz and V

= 3.3V, the

CC

AT27LV256A 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 AT27LV256A is available in industry standard JEDEC-

approved one-time programmable (OTP) plastic PLCC,
SOIC and TSOP packages. All devices feature two-line
control (CE

, OE) to give designers the flexibility to prevent

bus contention.
The AT27LV256A 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 AT27LV256A 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 AT27LV256A pro­grams exactly the same way as a standard 5V AT27C256R
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
low inherent inductance, ceramic capacitor should be uti­lized for each device. This capacitor should be connected
between the V

and Ground terminals of the device, as

CC

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.

µF high frequency,

and Ground

CC

Block Diagram

2

AT27LV256A

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

AT27LV256A

*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 be exceeded if certain precautions are observed (consult application notes) and which may

V

CC

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

Operating Modes

Mode \ Pin CE OE Ai V

(2)

Read

Output Disable

Standby

Rapid Program

PGM Verify

(2)

(2)

(3)

(3)

Optional PGM Verify

PGM Inhibit

(3)

Product Identification

Notes: 1. X can be V

2. Read, output disable, and standby modes require, 3.0V ≤ V

3. Refer to Programming Characteristics. Programming modes require V

(3)

(3)(5)

IL

or VIH.

V

IL

V

IL

V

IH

V

IL

(1)

X

V

IL

V

IH

V

IL

V

IL

V

IH

(1)

X

V

IH

V

IL

V

IL

V

IH

V

IL

Ai V

(1)

X

(1)

X

Ai V

Ai V

Ai V

(1)

X

A9 = V

(4)

H

A0 = VIH or VIL

A1 - A14 = V

≤ 3.6V, or 4.5V ≤ VCC ≤ 5.5V.

CC

IL

CC

4. VH = 12.0 ± 0.5V.

5. Two identifier bytes may be selected. All Ai inputs are held low (V
) to select the Manufacturer’s Identification byte and high (VIH) to select the Device Code byte.

low (V

IL

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

IL

PP

CC

V

CC

V

CC

PP

PP

CC

V

PP

V

CC

= 6.5V.

V

CC

(2)

V

CC

(2)

V

CC

(2)

V

CC

(3)

V

CC

(3)

V

CC

(3)

V

CC

(3)

V

CC

(3)

V

CC

Outputs

D

OUT

High Z

High Z

D

IN

D

OUT

D

OUT

High Z

Identification Code

3

DC and AC Operating Conditions for Read Operation

AT27LV256A

-55 -70 -90 -12 -15

Operating Temperature
(Case)

Com. 0°C - 70°C0°C - 70°C0°C - 70°C0°C - 70°C0°C - 70°C

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

3.0V to 3.6V 3.0V to 3.6V 3.0V to 3.6V 3.0V to 3.6V 3.0V to 3.6V

Power Supply

V

CC

5V ± 10% 5V ± 10% 5V ± 10% 5V ± 10% 5V ± 10%

DC and Operating Characteristics for Read Operation

Symbol Parameter Condition Min Max Units

VCC = 3.0V to 3.6V

I

LI

I

LO

(2)

I

PP1

I

SB

I

CC

V

IL

V

IH

V

OL

V

OH

V

= 4.5V to 5.5V

CC

I

LI

I

LO

(2)

I

PP1

I

SB

I

CC

V

IL

V

IH

V

OL

V

OH

Notes: 1. VCC must be applied simultaneously with or before VPP, and removed simultaneously with or after VPP.

Input Load Current VIN = 0V to V

Output Leakage Current V

(1)

V

Read/Standby Current VPP = V

PP

(1)

V

Standby Current

CC

= 0V to V

OUT

CC

I

(CMOS), CE = V

SB1

I

(TTL), CE = 2.0 to VCC + 0.5V 100 µA

SB2

VCC Active Current f = 5 MHz, I

CC

CC

CC=±

= 0 mA, CE = V

OUT

0.3V 20 µA

IL

±1 µA

±5 µA

10 µA

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

(1)

V

Read/Standby Current VPP = V

PP

(1)

V

Standby Current

CC

= 0V to V

OUT

CC

I

(CMOS), CE = VCC ± 0.3V 100 µA

SB1

I

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

SB2

VCC Active Current f = 5 MHz, I

CC

CC

= 0 mA, CE = V

OUT

IL

±1 µA

±5 µA

10 µA

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 µA2.4V

2. V

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

PP

4

AT27LV256A