Datasheet AT27C520-90XI, AT27C520-90XC, AT27C520-90TI, AT27C520-90TC, AT27C520-90SI Datasheet (ATMEL)

Features

•

8-Bit Multiplexed Addresses/Outputs

•

Fast Read Access Time - 70 ns

•

Low Power CMOS Operation

– 20 mA max. Active at 5 MHz

•

20-Lead TSSOP Package

•

20-Lead SOIC Package

•

28-Lead TSOP Package

•

5V ± 10% Supply

•

High Reliability CMOS Technology

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

•

Rapid™ Programming Algorithm - 50

•

CMOS and TTL Compatible Inputs and Outputs

•

Integrated Product Identification Code

•

Commercial and Industrial Temperature Range

µµµµ

s/byte (typical)

512K (64K x 8)
Multiplexed
Addresses/

Description

The AT27C520 is a low-power, high performance 524,288 bit one-time programmable
read only memory ( OTP EP ROM) o rgani zed 6 4K by 8 bits . It i ncorpor ates la tches for
the 8 lower order address bits to mul ti ple x with the 8 dat a bits . Thi s minim iz es sy st em
chip count, reduces cost, and simplifies the design of multi plexed bus syst ems. It
requires only one 5V power supply in normal read mode operation. Any byte can be
accessed in le ss th an 70 n s, el imina ting th e need for s peed r educi ng WA IT state s on
high performance microprocessor systems.

Atmel’s scaled CMO S tec hnol ogy prov ides high speed, lower active powe r cons ump­tion, and significantly faster programming. Power consumption is typically only 8 mA
in Active Mode.

The AT27C520 is avail able in 173 m il, 20-pin TSSO P; 300 m il, 20-p in S OIC; an d 28­pin TSOP, one-time programmable (OTP) plastic packages.

(continued)

Pin Configurations

Pin Name Function

A8 - A15 Addresses
AD0 - AD7 Addresses/Outputs
OE

/V

PP

ALE Address Latch Enable

Output Enable/V

PP

TSSOP Top View

1

A10

2

A12

3

A14

4

ALE

5

VCC

A15
A13
A11

6
7
8
9
10

A9

OE/VPP

20

A8

19

AD1

18

AD3

17

AD5

16

AD7

15

GND

14

AD6

13

AD4

12

AD2

11

AD0

Outputs
OTP EPROM

AT27C520

A10

A12
A14
ALE

VCC

OE/VPP

A15
A13
A11

TSOP Top View

22
23

NC

24

NC

25
26
27

28

1
2
3
4
5

NC

6

NC

7

A9

21

A8

20

NC

19

NC

18

AD1

17

AD3

16

AD5

15

AD7

14

GND

13

AD6

12

AD4

11

AD2

10

NC

9

NC

8

AD0

SOIC Top View

OE/VPP

A15
A13
A11

A9
AD0
AD2
AD4
AD6

GND

1

20
2
3
4
5
6
7
8
9
10

VCC

19

ALE

18

A14

17

A12

16

A10

15

A8

14

AD1

13

AD3

12

AD5

11

AD7

Rev. 0752C-C–01/98

1

With 64K byte storage capability, the AT27C520 allows
firmware to be stored reliably and to be accessed by the
system without the delays of mass storage media.

Atmel's 27C520 ha s 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 onl y 50 µs/byte. Th e Integrated P roduct
Identification Code electronic ally identi fies the devic e and
manufacturer. This feature is used by industry standard
programmin g equip ment to se lect th e prope r prog rammi ng
algorithms and voltages.

Block Diagram

V

CC

GND

System Considerations

Switching under active conditions may produce transient
voltage excursions. Unless accomm odated by the sy stem
design, these transient s may exceed data sheet li mits,
resulting in device non-conformance. At a minimum, a 0.1
µF high frequency, low inherent inductance, ceramic
capacitor should be utili zed for eac h dev ice. This capac itor
should be connected between th e V
nals of the device, as close to the device as possible. Addi­tionally, to stabilize the supply voltage level on printed cir­cuit boards with larg e EPROM array s, a 4.7 µF bulk elec­trolytic capacitor should be utilized, again connected
between the V

and Ground ter minals. This c apacitor

CC

should be positioned as close as possible to the point
where the power supply is connected to the array.

8

and Ground termi -

CC

OE/VPP

ALE

AD7 - AD0

A15 - A8

OE, ALE, AND

PROGRAM LOGIC

Y DECODER

LATCHES

8

X DECODER

OUTPUT

BUFFERS

Y-GATING

CELL MATRIX

IDENTIFICATION

2

AT27C520

Absolute Maximum Ratings*

AT27C520

Temperature Under Bias................................-55°C to +125°C

*NOTICE: Stresses beyond those listed under “Absolute

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

(1)

(1)

Note: 1. Minimum voltage is -0.6V DC which may under-

VPP Supply Voltage with

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

(1)

Operating Modes

Mode/Pin ALE OE/V

Read V
Output Disable VIL/V
Address Latch Enable V
Rapid Program

Product Identification

Notes: 1. X can be VIL or V

2. Refer to Programming Characteristics.

3. VH = 12.0 ± 0.5V.

4. Two identifier bytes may be selected. All A8 - A15 inputs are held low (V

(2)

toggled low (V

(3)

IH.

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

IL

IL

IH

IH

V

IH

V

IL

Maximum Ratings” may cause permanent dam­age to the dev ice . This is a stress ra ting onl y and
functional oper ati on of the device at thes e or any
other conditions beyond those indicated in the
operational sections of this specification is not
implied. Exposure to absolute maximum rating
conditions f or exten ded periods may af fect de vice
reliability.

shoot to -2.0V f or pul ses o f less than 20 ns . M ax­imum output pin voltage is V

+ 0.75V DC

CC

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

PP

V

IL

V

IH

V

IH

V

PP

V

IL

A8 - A15 AD0 - AD7

Ai D

(1)

X

OUT

High Z/A0 - A7

XA0 - A7

Ai D

A9 = V

A8 = VIH or V

A10 - A15 = V

), except A9 which is set to VH and A8 which is

IL

(4)

H

IL

IL

Identification Code

IN

3

DC and AC Operating Conditions for Read Operation

-70 -90

AT27C520

Operating Tem p.(Case)

Com. 0°C - 70°C 0°C - 70°C

Ind. -40°C - 85°C -40°C - 85°C

V

Supply 5V ± 10% 5V ± 10%

CC

DC and Operating Characteristics for Read Operation

Symbol Parameter Condition Min Max Units

I

LI

(1)

I

LI2

I

LO

I

CC

V

IL

V

IH

V

OL

V

OH

Note: 1. For address input A13 only.

Input Load Current VIN = 0V to V
Input Load Current A13 VIN = 0V to V
Output Leakage Current V

= 0V to V

OUT

VCC Active Current f = 5 MHz, I

CC

CC

CC

= 0 mA 20 mA

OUT

±1 µA

±100 µA

±5 µA

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

AC Characteristics for Read Operation

Symbol Parameter Condition

(2)

t

ACC

t

AS

t

AH

t

ALE

(2)

t

OE

(3)(4)

t

DF

t

OH

Notes: 1. 2, 3, 4 — see AC Waveforms for Read Operation

4

Address to Output Delay ALE = OE/VPP = V
Address Setup Time OE/VPP = V
Address Hold Time OE/VPP = V
Address Latch Enable Width OE/VPP = V
OE/VPP to Output Delay ALE = V
OE/V
Output Hold from Address or

OE/VPP , whichever occurred first

High to Output Float ALE = V

PP

ALE = V

AT27C520

AT27C520

-70 -90

Min Max Min Max

IL

IH
IH
IH

IL

IL

IL

12 15 ns
12 15 ns
40 45 ns

70 ns

70 90 ns

30 35 ns
25 25 ns

Units

AT27C520

AC Waveforms f or Read Operation

tALE

ALE

PP

OE/V

AD7 - AD0

A15 - A8

Notes: 1. Timing measurement reference levels for all speed grades are VOL = 0.8V and VOH = 2.0V. Input AC drive levels are VIL =

0.45V and V

2. OE/VPP may be delayed up to t

3. This parameter is only sampled and is not 100% tested.

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

= 2.4V.

IH

- tOE after the address is valid without impact on t

ACC

(1)

tAS tAH

ADDRESS IN

tACC

tOE

tOH

DATA OUT

.

ACC

tDF

Input Test Waveforms and Measurement Levels

Output Test Load

For -70 and -90 devices:

t

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

R

Note: CL = 100 pF including jig

capacitance.

Pin Capacitance

(f = 1 MHz, T = 25°C)

(1)

Typ Max Units Conditions

C

IN

C

OUT

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

46 pF V
812 pF V

IN

OUT

= 0V

= 0V

5

Programming Waveforms

PROGRAM READ (VERIFY)

6.5V

VCC

5.0V
tVCS

13V

OE/VPP

IH

V

ALE

AD7 - AD0

A15 - A8

VIL

VIH

VIL

VIH

VIL

VIH

VIL

tLAS tLAH

tPRT

tLP

tALE

ADDR

tAS

Notes: 1. The Input Timing Reference is 0.8V for VIL and 2.0V for VIH.

2. t

OE

and t

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

DFP

tOES

tPW

DATA IN

tOEH

tDHtDS

ADDRESS STABLE

tVR

tALE

ADDR

tLAHtLAS

tOE tDFP

DATA OUT

tAH

DC Programming Characteristics

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

Symbol Parameter Test Conditions

I

LI

(1)

I

LI2

V

IL

V

IH

V

OL

V

OH

I

CC2

I

PP2

Note: 1. For address input A13 only.

Input Load Current VIN = VIL, V
Input Load Current A13 VIN = VIL, V

IH

IH

Input Low Level -0.6 0.8 V
Input High Level 2.0 V
Output Low Voltage I

= 2.1 mA 0.4 V

OL

Output High Voltage IOH = -400 µA2.4V
VCC Supply Current (Program and Verify) 25 mA
OE/VPP Current ALE = V

IH

Limits

±

10

±

100

+ 1.0 V

CC

25 mA

UnitsMin Max

µ

A

µ

A

6

AT27C520

AT27C520

AC Programming Characteristics

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

Symbol Parameter

t

ALE

t

LAS

t

LAH

t

LP

t

OES

t

OEH

t

DS

t

DH

t

PW

t

VR

t

VCS

t

OE

t

DFP

t

AS

t

AH

t

PRT

Address Latch Enable Width
Latched Address Setup Time 100 ns
Latched Address Hold Time 100 ns
ALE Low to OE/VPP High Voltage Delay 2
OE/VPP Setup Time 2
OE/VPP Hold Time 2
Data Setup Time 2
Data Hold Time 2
ALE Program Pulse Width
OE/VPP Recovery Time 2
VCC Setup Time 2
Data Valid from OE/V
OE/VPP High to Output Float Delay
Address Setup Time 2
Address Hold Time 0
OE/VPP Pulse Rise Time Duri ng Programming 50 ns

(1)

Input Rise and Fall Times

Input Pulse Levels

(2)

Input Timing Reference Level

Output Timing Reference Level

PP

(3)

Notes: 1. VCC must be applied simultaneously or before OE/VPP and removed simultaneously or after OE/VPP.

2. Program Pulse width tolerance is 50 µsec

±

5%.

3. 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.

Test Conditions

(10% to 90%) 20 ns

0.45V to 2.4V

0.8V to 2.0V

0.8V to 2.0V

Limits

UnitsMin Max

500 ns

47.5 52.5

150 ns

0 130 ns

s

µ

s

µ

s

µ

s

µ

s

µ

s

µ

s

µ

s

µ

s

µ

s

µ

Atmel’s 27C520 Integrated Product Identification Code

Pins

Codes
Manufacturer 0000111101E
Device Type 1100111019D

Hex

DataA8 AD7 AD6 AD5 AD4 AD3 AD2 AD1 AD0

7

™

Rapid

Programming Algorithm

A 50 µs ALE pulse width is used to program. The address
is set to the first location. V

is raised to 6.5 V and OE/V

CC

PP

is raised to 13.0V. Each add ress is fir st programmed with
one 50 µs ALE pulse without verification. Then a verifica­tion/reprogramming loo p is exec uted for each addres s. In
the event a byte fails to pass verification, up to 10 succes­sive 50 µs pulses are applied with a verification after each

ADDR = FIRST LOCATION

V = 6.5V

V = 13.0V

PROGRAM ONE 50 S PULSEµ

pulse. If the by te fails to v erify afte r 10 pulses ha ve been
applied, the part is consi dered fai led. Afte r the byte ve rifies
properly, the next address is selected until all have been
checked. OE

/VPP is then lowered to VIH and VCC to 5.0V. All
bytes are read again and compared with the original data to
determine if the device passes or fails.

START

CC

PP

INCREMENT

ADDRESS

INCREMENT

ADDRESS

NO

LAST

ADDR.?

YES

NO

LAST

ADDR.?

YES

ADDR = FIRST LOCATION

X = 0

PASS

PROGRAM ONE 100 S PULSEµ

VERIFY

BYTE

V = 5.0V

CC

V = 5.0V

PP

COMPARE

ALL BYTES

TO ORIGINAL

DATA

PASS

FAIL

FAIL

INCREMENT X

NO

X = 10?

YES

DEVICE

FAILED

DEVICE

PASSED

8

AT27C520

Ordering Information

(mA)

I

CC

t

(ns)

ACC

70 20 AT27C520-70SC

90 20 AT27C520-90SC

Active Ordering Code Package Operation Range

AT27C520-70TC
AT27C520-70XC

AT27C520-70SI
AT27C520-70TI
AT27C520-70XI

AT27C520-90TC
AT27C520-90XC

AT27C520-90SI
AT27C520-90TI
AT27C520-90XI

20S
28T
20X

20S
28T
20X

20S
28T
20X

20S
28T
20X

AT27C520

Commercial

(0°C to 70°C)

Industrial

(-40°C to 85°C)

Commercial

(0°C to 70°C)

Industrial

(-40°C to 85°C)

Package Type

20S 20-Lead, 0.300” Wide, Plastic Gull-Wing Small Outline (SOIC)
28T 28-Lead, Thin Small Outline Package (TSOP)
20X 20-Lead, 0.173” Wide, Thin Shrink Small Outline (TSSOP)

9

Packaging Information

20S

, 20-Lead, 0.300” Wide,
Plastic Gull Wing Small Outline
Dimensions in Inches and (Millimeters)

.020(.508)
.013(.330)

28T

, 28-Lead, Plastic Thin Small Outline Package
(TSOP)
Dimensions in Millimeters and (Inches)

.299(7.60)
.291(7.39)

PIN 1 ID

.050(1.27) BSC

.513(13.0)
.497(12.6)

.012(.305)
.003(.076)

.035(0.889)

0

.015(.381)

REF

8

20X

, 20-Lead, 0.173” Wide, Thin Super Small Outline

.420(10.7)
.393(9.98)

.105(2.67)
.092(2.34)

.013(.330)
.009(.229)

Package (TSSOP)
Dimensions in (Millimeters) and Inches

0.30(0.012)

0.18(0.007)

10

PIN 1 ID

0

REF

8

4.48(.176)

4.30(.169)

0.65(.0256) BSC

6.60(.260)

6.40(.252)

0.15(.006)

0.05(.002)

0.70(.028)

0.50(.020)

AT27C520

6.50(.256)

6.25(.246)

1.10(0.043) MAX

0.18(.007)

0.09(.003)