ATMEL AT27LV256A User Manual

BDTIC www.BDTIC.com/ATMEL

Features

• Fast Read Access Time – 55 ns

• 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 V

• JEDEC Standard Packages

– 32-lead PLCC
– 28-lead 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

• Industrial Temperature Range

• Green (Pb/Halide-free) Packaging Option

= 3.6V

CC

= 3.6V

CC

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

AT27LV256A

1. Description

The AT27LV256A is a high-performance, low-power, low-voltage 262,144-bit one­time 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,
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
accessed in less than 55 ns. With a typical power dissipation of only 18 mW at 5 MHz
and V
dard 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

The AT27LV256A operating with V
compatible with standard TTL logic devices operating at V
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 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.

= 3.3V, the AT27LV256A consumes less than one fifth the power of a stan-

CC

, OE) to give designers the flexibility to prevent bus contention.

at 3.0V produces TTL level outputs that are

CC

= 3.0V, any byte can be

CC

= 5.0V. The device is

CC

0547G–EPROM–12/07

2. Pin Configurations

Pin Name Function

A0 - A14 Addresses

O0 - O7 Outputs

CE

OE

NC No Connect

Chip Enable

Output Enable

AT27LV256A

2.1 28-lead SOIC Top View

VPP

A12

A7
A6
A5
A4
A3
A2
A1

A0
O0
O1
O2

GND

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

28
27
26
25
24
23
22
21
20
19
18
17
16
15

2.2 32-lead PLCC Top View

A7

A12

A6
A5
A4
A3
A2
A1
A0

NC

O0

VPPNCVCC

432

5
6
7
8
9
10
11
12
13

14151617181920

1

323130

A14

A13

29
28
27
26
25
24
23
22
21

VCC
A14
A13
A8
A9
A11
OE
A10
CE
O7
O6
O5
O4
O3

A8
A9
A11
NC
OE
A10
CE
O7
O6

2.3 28-lead TSOP (Type 1) Top View

22

OE

A11

A9

A8
A13
A14

VCC

VPP

A12

A7

A6

A5

A4

A3

23
24
25
26
27
28
1
2
3
4
5
6
7

21
20
19
18
17
16
15
14
13
12
11
10

A10
CE
O7
O6
O5
O4
O3
GND
O2
O1
O0
A0

9

A1

8

A2

O1

O2

GND

O3O4O5

NC

Note: 1. PLCC Package Pins 1 and 17 are Don’t Connect.

0547G–EPROM–12/07

2

3. 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 datasheet 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
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
close as possible to the point where the power supply is connected to the array.

4. Block Diagram

AT27LV256A

and Ground terminals of the device, as close

CC

and Ground terminals. This capacitor should be positioned as

CC

5. 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

VPP Supply Voltage with

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

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.

(1)

(1)

(1)

*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

0547G–EPROM–12/07

3

6. 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

(3)

(3)(5)

V

V

V

V

X

V

V

V

IL

IL

IH

IL

(1)

IL

IH

IL

V

V

X

V

V

V

V

V

IL

IH

(1)

IH

IL

IL

IH

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

IL

V

PP

CC

V

CC

V

CC

PP

PP

CC

V

PP

CC

Notes: 1. X can be VIL or VIH.

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

≤ 3.6V, or 4.5V ≤ VCC ≤ 5.5V.

CC

3. Refer to Programming Characteristics. Programming modes require VCC = 6.5V.

4. V

= 12.0 ± 0.5V.

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

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

IL

7. DC and AC Operating Conditions for Read Operation

V

CC

V

CC

V

CC

V

CC

V

CC

V

CC

V

CC

V

CC

V

CC

Outputs

D

OUT

High Z

High Z

D

IN

D

OUT

D

OUT

High Z

Identification Code

AT27LV256A

-55 -90

Industrial Operating Temperature (Case) -40°C - 85°C -40°C - 85°C

3.0V to 3.6V 3.0V to 3.6V

V

Power Supply

CC

5V ± 10% 5V ± 10%

4

AT27LV256A

0547G–EPROM–12/07

AT27LV256A

8. DC and Operating Characteristics for Read Operation

Symbol Parameter Condition Min Max Units

= 3.0V to 3.6V

V

CC

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. 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

(TTL), CE = 2.0 to VCC + 0.5V 100 µA

I

SB2

VCC Active Current f = 5 MHz, I

CC

CC

CC ±

= 0 mA, CE = V

OUT

0.3V 20 µA

IL

±1µA

±5µA

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

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

I

SB2

VCC Active Current f = 5 MHz, I

CC

CC

= 0 mA, CE = V

OUT

IL

±1µA

±5µA

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 µA 2.4 V

2. V

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

PP

0547G–EPROM–12/07

5