Atmel AT27C020 Datasheet

Features

• Fast read access time – 55ns

• Low-power CMOS operation

– 100µA max standby

– 25mA max active at 5MHz

• JEDEC standard packages

– 32-lead PDIP

– 32-lead PLCC

• 5V 10% supply

• High-reliability CMOS technology

– 2,000V ESD protection

– 200mA latchup immunity

• Rapid

programming algorithm – 100µs/byte (typical)

• CMOS- and TTL-compatible inputs and outputs

• Integrated product identification code

• Industrial and automotive temperature ranges

• Green (Pb/halide-free) packaging option

1. Description

The Atmel® AT27C020 is a low-power, high-performance, 2,097,152-bit, one-time pro­grammable, read-only memory (OTP EPROM) organized as 256K by 8 bits. It requires only
one 5V power supply in normal read mode operation. Any byte can be accessed in less than
55ns, eliminating the need for speed-reducing WAIT states on high-performance micropro­cessor systems.

2Mb (256K x 8)
One-time
Programmable,
Read-only Memory

Atmel AT27C020

In read mode, the AT27C020 typically consumes 8mA. Standby mode supply current is
typically less than 10µA.

The AT27C020 is available in a choice of industry-standard, JEDEC approved, one-time pro­grammable (OTP) PDIP and PLCC packages. All devices feature two-line control (CE, OE)
to give designers the flexibility to prevent bus contention.

With 256K byte storage capability, the AT27C020 allows firmware to be stored reliably and
to be accessed by the system without the delays of mass storage media.

The AT27C020 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 100µs/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.

0570H–EPROM–4/11

2. Pin configurations

Pin name Function

A0 - A17 Addresses

O0 - O7 Outputs

CE Chip enable

OE Output enable

PGM Program strobe

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 nonconformance.
At a minimum, a 0.1µF, 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 4.7µF 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.

A7
A6
A5
A4
A3
A2
A1
A0

O0

32-lead PLCC

Top view

A12

A15

A16

VPP

432

5
6
7
8
9
10
11
12
13

14151617181920

01

1

02

030405

GND

VCC

PGM

323130

A17

29
28
27
26
25
24
23
22
21

06

A14
A13
A8
A9
A11
OE
A10
CE
07

32-lead PDIP

1

VPP

2

A16

3

A15

4

A12

5

A7

6

A6

7

A5

8

A4

9

A3

10

A2

11

A1

12

A0

13

O0

14

O1

15

O2

16

GND

Top view

VCC

32

PGM

31

A17

30

A14

29

A13

28

A8

27

A9

26

A11

25

OE

24

A10

23

CE

22

07

21

06

20

05

19

04

18

03

17

Figure 3-1. Block diagram

2

Atmel AT27C020

0570H–EPROM–4/11

4. Absolute maximum ratings*

Atmel AT27C020

Temperature under bias . . . . . . . . . . . . . .-55°C to +125°C

Storage temperature . . . . . . . . . . . . . . . . .-65°C to +150°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 20ns. Maximum output pin voltage is

V

+ 0.75V DC, which may overshoot to +7.0V for pulses of less than 20ns.

CC

5. DC and AC characteristics

Table 5-1. Operating modes

Mode/Pin CE OE PGM Ai V

Read V

Output disable X V

Standby V

Rapid program

(2)

PGM verify V

PGM inhibit V

Product identification

Notes: 1. X can be V

(4)

or VIH.

IL

2. Refer to programming characteristics.

= 12.0 ± 0.5V.

3. V

H

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

) to select the manufacturer’s identification byte and high (VIH) to select the device code byte.

IL

IL

IH

V

IL

IL

IH

V

IL

*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

(1)

this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may
affect device reliability.

(1)

(1)

PP

V

IL

IH

(1)

X

Ai X D

X X X High-Z

Outputs

OUT

X X X X High-Z

V

IH

V

IL

XX X V

V

IL

V

IL

V

IH

X

Ai V

Ai V

(3)

A9 = V

H

A0 = VIH or V

A1 - A17 = V

) except A9, which is set to VH, and A0, which is tog-

IL

PP

PP

PP

IL

IL

X Identification code

D

IN

D

OUT

High-Z

Table 5-2. DC and AC operating conditions for read operation

Operating temperature (case)

power supply 5V 10% 5V 10%

V

CC

0570H–EPROM–4/11

Atmel AT27C020

-55 -90

Ind. -40C - 85C -40C - 85C

Auto. -40C - 125C

3

Table 5-3. DC and operating characteristics for read operation

Symbol Parameter Condition Min Max Units

I

LI

I

LO

(2)

I

PP

I

SB

I

CC

V

IL

V

IH

V

OL

V

OH

Notes: 1. V

Input load current VIN = 0V to V

Output leakage current V

(1)

V

read/standby current V

PP

(1)

V

standby current

CC

= 0V to V

OUT

= V

PP

(CMOS), CE = VCC 0.3V 100 µA

I

SB1

(TTL), CE = 2.0 to V

I

SB2

VCC active current f = 5MHz, I

CC

CC

OUT

CC

= 0mA, CE = V

Input low voltage -0.6 0.8 V

Input high voltage 2.0 VCC + 0.5 V

Output low voltage I

= 2.1mA 0.4 V

OL

Output high voltage IOH = -400µA 2.4 V

must be applied simultaneously or before V

CC

, and removed simultaneously or after V

PP

2. VPP may be connected directly to VCC except during programming. The supply current would then be the sum of I
I

.

PP

Table 5-4. AC characteristics for read operation

Symbol Parameter Condition

t

t

t

t

ACC

CE

OE

DF

(3)

(2)

(2)(3)

(4)(5)

Address to output delay

CE to output delay OE = V

OE to output delay CE = V

OE or CE high to output float,

Whichever occurred first

CE = OE
= V

(Com., Ind.) ±1.0 µA

(Com., Ind.) ±5.0 µA

±10 µA

+ 0.5V 1.0 mA

CC

IL

25 mA

PP

Atmel AT27C020

-55 -90

Min Max Min Max

Units

55 90 ns

IL

IL

IL

55 90 ns

20 35 ns

18 20 ns

CC

and

t

OH

4

Atmel AT27C020

Output hold from address, CE or OE,

Whichever occurred first

70ns

0570H–EPROM–4/11

Atmel AT27C020

Figure 5-1. AC waveforms for read operation

(1)

Notes: 1. Timing measurement references are 0.8V and 2.0V. Input AC drive levels are 0.45V and 2.4V, unless otherwise specified.

OE may be delayed up to tCE - tOE after the falling edge of CE without impact on tCE.

2.

OE may be delayed up to t

3.

- tOE after the address is valid without impact on t

ACC

ACC

.

4. This parameter is only sampled, and is not 100% tested.

5. Output float is defined as the point when data is no longer driven.

Figure 5-2. Input test waveforms and measurement levels

For -55 devices only:

3.0V

AC

DRIVING

LEVELS

0.0V

1.5V

tR, tF < 5ns (10% to 90%)

For -90 devices only:

tR, tF < 20ns (10% to 90%)

Figure 5-3. Output test load

AC
MEASUREMENT
LEVEL

Note: CL = 100pF including jig capacitance, except -55 devices, where CL = 30pF

0570H–EPROM–4/11

5

Table 5-5. Pin capacitance

f = 1MHz, T = 25C

(1)

Symbol Typ Max Units Conditions

C

IN

C

OUT

4 8 pF VIN = 0V

812pFV

OUT

= 0V

Note: 1. Typical values for nominal supply voltage. This parameter is only sampled, and is not 100% tested.

Figure 5-4. Programming waveforms

(1)

Note: 1. The input timing reference is 0.8V for VIL and 2.0V for VIH.

and t

2. t

OE

3. When programming the Atmel AT27C020, a 0.1µF capacitor is required across V

are characteristics of the device, but must be accommodated by the programmer

DFP

and ground to suppress voltage

PP

transients

6

Atmel AT27C020

0570H–EPROM–4/11

Table 5-6. DC programming characteristics

TA = 25 ± 5°C, VCC = 6.5 ± 0.25V, VPP = 13.0 ± 0.25V

Atmel AT27C020

Limits

Symbol Parameter Test conditions

I

V

V

V

V

I

I

V

LI

IL

IH

OL

OH

CC2

PP2

ID

Input load current VIN = VIL, V

Input low level -0.6 0.8 V

Input high level 2.0 V

Output low voltage IOL = 2.1mA 0.4 V

Output high voltage IOH = -400µA 2.4 V

VCC supply current (program and verify) 40 mA

VPP supply current CE = PGM = V

A9 product identification voltage 11.5 12.5 V

Table 5-7. AC programming characteristics

TA = 25 ± 5°C, VCC = 6.5 ± 0.25V,VPP = 13.0 ± 0.25V

Symbol Parameter Test condition

t

AS

t

CES

t

OES

t

DS

t

AH

t

DH

t

DFP

t

VPS

t

VCS

t

PW

t

OE

t

PRT

Notes: 1. V

Address setup time

CE setup time 2µs

OE setup time 2 µs

Data setup time 2 µs

Address hold time 0 µs

Data hold time 2 µs

OE high to output float delay

(2)

VPP setup time 2 µs

V

setup time 2 µs

CC

PGM program pulse width

(3)

Data valid from OE 150 ns

Input rise and fall times:
(10% to 90%) 20ns

Input pulse levels:

0.45V to 2.4V

Input timing reference level:

0.8V to 2.0V

Output timing reference level:

0.8V to 2.0V

VPP pulse rise time during

programming

must be applied simultaneously with or before V

CC

2. This parameter is only sampled and is not 100% tested. Output float is defined as the point where data is no longer driven.
See timing diagram.

3. Program pulse width tolerance is 100µs ± 5%.

(1)

and removed simultaneously with or after V

PP

UnitsMin Max

IH

IL

10 µA

+ 1.0 V

CC

20 mA

Limits

UnitsMin Max

2µs

0 130 ns

95 105 µs

50 ns

.

PP

0570H–EPROM–4/11

7

Table 5-8. The Atmel AT27C020 integrated product identification code

Pins

Codes

Manufacturer 0 0 0 0 1 1 1 1 0 1E

Device type 1 1 0 0 0 0 1 1 0 86

6. Rapid programming algorithm

A 100µs PGM pulse width is used to program. The address is set to the first location. VCC is raised to 6.5V and VPP is raised
to 13.0V. Each address is first programmed with one 100µs
verification/reprogramming loop is executed for each address. In the event a byte fails to pass verification, up to 10
successive 100µs pulses are applied with a verification after each pulse. If the byte fails to verify after 10 pulses have been
applied, the part is considered failed. After the byte verifies properly, the next address is selected until all have been
checked. VPP is then lowered to 5.0V and VCC to 5.0V. All bytes are read again and compared with the original data to
determine if the device passes or fails.

Hex dataA0 O7 O6 O5 O4 O3 O2 O1 O0

PGM pulse without verification. Then a

8

Atmel AT27C020

0570H–EPROM–4/11

Figure 6-1. Rapid programming algorithm

Atmel AT27C020

0570H–EPROM–4/11

9

7. Ordering information

Green package (Pb/halide-free)

I

t

ACC

(ns)

CC

(mA)

Atmel ordering code Package Lead finish Operation rangeActive Standby

55 25 0.1

90 25 0.1

AT27C020-55JU
AT27C020-55PU

AT27C020-90JU
AT27C020-90PU

32J

32P6

32J

32P6

Matte tin

Matte Tin

Matte tin
Matte tin

Industrial

(-40C to 85C)

Industrial

(-40C to 85C)

10

Package type

32J 32-lead, plastic, J-leaded chip carrier (PLCC)

32P6 32-lead, 0.600" wide, plastic, dual inline package (PDIP)

Atmel AT27C020

0570H–EPROM–4/11

8. Packaging information

32J – PLCC

Atmel AT27C020

1.14(0.045) X 45°

E1 E

D1

D

D2

PIN NO. 1

IDENTIFIER

1.14(0.045) X 45°

B

e

0.51(0.020)MAX

45° MAX (3X)

Notes: 1. This package conforms to JEDEC reference MS-016, Variation AE.

2. Dimensions D1 and E1 do not include mold protrusion.
Allowable protrusion is .010"(0.254mm) per side. Dimension D1
and E1 include mold mismatch and are measured at the extreme
material condition at the upper or lower parting line.

3. Lead coplanarity is 0.004" (0.10mm) maximum.

0.318(0.0125)

0.191(0.0075)

E2

B1

A2

A1

A

COMMON DIMENSIONS
(Unit of measure = mm)

SYMBOL

A 3.175 – 3.556

A1 1.524 – 2.413

A2 0.381 – –

D 12.319 – 12.573

D1 11.354 – 11.506 Note 2

D2 9.906 – 10.922

E 14.859 – 15.113

E1 13.894 – 14.046 Note 2

E2 12.471 – 13.487

B 0.660 – 0.813

B1 0.330 – 0.533

e 1.270 TYP

MIN

NOM

MAX

NOTE

10/04/01

0570H–EPROM–4/11

Package Drawing Contact:
[e-mail]

TITLE

32J, 32-lead, Plastic J-leaded Chip Carrier (PLCC)

DRAWING NO.

32J

REV.

B

11

32P6 – PDIP

PIN

1

E1

A1

B

REF

E

B1

C

L

SEATING PLANE

A

D

e

COMMON DIMENSIONS

0º ~ 15º

eB

Note: 1. Dimensions D and E1 do not include mold Flash or Protrusion.
Mold Flash or Protrusion shall not exceed 0.25mm (0.010").

SYMBOL

A – – 4.826

A1 0.381 – –

D 41.783 – 42.291 Note 1

E 15.240 – 15.875

E1 13.462 – 13.970 Note 1

B 0.356 – 0.559

B1 1.041 – 1.651

L 3.048 – 3.556

C 0.203 – 0.381

eB 15.494 – 17.526

e 2.540 TYP

(Unit of Measure = mm)

MIN

NOM

MAX

NOTE

09/28/01

Package Drawing Contact:
[e-mail]

TITLE

32P6, 32-lead (0.600"/15.24mm wide) Plastic Dual
Inline Package (PDIP)

DRAWING NO.

32P6

REV.

B

12

Atmel AT27C020

0570H–EPROM–4/11

9. Revision history

Doc. Rev. Date Comments

0570H 04/2011 Remove TSOP package

0570G 12/2007

Atmel AT27C020

Add lead finish to ordering information

0570H–EPROM–4/11

13

Atmel Corporation

2325 Orchard Parkway

San Jose, CA 95131

USA

Tel: (+1) [phone]

Fax: (+1) [phone]

www.atmel.com

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JAPAN

Tel: (+81) (3) 3523-3551

Fax: (+81) (3) 3523-7581

Fax: [phone]

© 2011 Atmel Corporation. All rights reserved. / Rev.: 0570H–EPROM–4/11

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