Rainbow Electronics AT27C2048 User Manual

Features

•

Fast Read Access Time - 55 ns

•

Low Power CMOS Operation

– 100 µA Maximum Standby
– 35 mA Maximum Active at 5 MHz

•

JEDEC Standard Packages

– 40-Lead 600 mil PDIP
– 44-Lead PLCC
– 40-Lead VSOP (10 mm x 14 mm)

•

Direct Upgrade from 512K-bit and 1M-bit (AT27C516 and AT27C1024) EPROMs

•

5V ± 10% Power Supply

•

High Reliability CMOS Technology

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

•

Rapid™ Programming Algorithm - 50 µs/word (typical)

•

CMOS and TTL Compatible Inputs and Outputs

•

Integrated Product Identification Code

•

Commercial and Industrial Temperature Ranges

2-Megabit
(128K x 16)
OTP EPROM

Description

The AT27C2048 is a low-power, high performance 2,097,152-bit one-time program­mable read only memor y (OTP EP ROM) or ganiz ed 128K by 16 bits . It re quires a sin­gle 5V power su pply i n norma l read mode o peratio n. Any word c an be a ccessed in
less than 55 ns, e liminating the need for s peed-reducin g WAIT states. The by-16
organization makes thi s par t ideal for high-pe rform ance 16 and 32 bit micr opro cess or

VCC
PGM
A16
A15
A14
A13
A12
A11
A10
A9
GND
A8
A7
A6
A5
A4
A3
A2
A1
A0

(continued)

systems.

Pin Configurations

Pin Name Function

A0 - A16 Addresses
O0 - O15 Outputs
CE
OE Output Enable
PGM
NC No Connect
DC Don’t Connect

Note: Both GND pins must be connected.

Chip Enable

Program Strobe

VSOP Top View

Type 1

PDIP Top View

1

VPP

O15
O14
O13
O12
O11
O10

GND

CE

O9
O8

O7
O6
O5
O4
O3
O2
O1
O0
OE

40

2

39

3

38

4

37

5

36

6

35

7

34

8

33

9

32

10

31

11

30

12

29

13

28

14

27

15

26

16

25

17

24

18

23

19

22

20

21

PLCC Top View

AT27C2048

A10
A11
A12
A13
A14
A15
A16

PGM

VCC
VPP

O15
O14
O13
O12
O11
O10

1

A9

2
3
4
5
6
7
8
9
10
11
12

CE

13
14
15
16
17
18
19

O9

20

O8

40

GND

39

A8

38

A7

37

A6

36

A5

35

A4

34

A3

33

A2

32

A1

31

A0

30

OE

29

O0

28

O1

27

O2

26

O3

25

O4

24

O5

23

O6

22

O7

21

GND

Note: PLCC package pins 1 and 23
are DON’T CONNECT.

O13

O14

65432

7

O12

8

O11

9

O10

10

O9

11

O8

12

GND

13

NC

14

O7

15

O6

16

O5

17

O4

1819202122232425262728

O3O2O1

O15CEVPPDCVCC

1

4443424140

A0A1A2A3A4

O0

OE

DC

PGM

A16

A15

A14

39
38
37
36
35
34
33
32
31
30
29

A13
A12
A11
A10
A9
GND
NC
A8
A7
A6
A5

Rev. 0632C–10/98

1

In read mode, the AT27C2048 typically consumes 15 mA.
Standby mode supply current is typically less than 10 µA.

The AT27C2048 is available in industry standard
JEDEC-approved one-tim e programmable (OTP) plastic
PDIP, PLCC, and VSOP packages . The device features
two-line control (CE
high-speed systems.

With high density 128K word storage capability, the
AT27C2048 allows firmware to be stored reliably and to be
accessed by the system without the delays of mass storage
media.

Atmel’s AT27C2048 has additional features that ensure
high quality and efficient productio n use. The Rapid
gramming Algorithm reduces the time required to program
the part and guarantees reliable programming. Program­ming time is typically only 50 µs/word. The Integrated Prod­uct Identif ication Code ele ctronica lly iden tifies the dev ice
and manufacturer. This feature is used by industr y stan-

, OE) to eliminate bus contention in

™

Pro-

Block Diagram

dard programming equipment to select the proper program­ming algorithms and voltages.

System Considerations

Switching between active and standby conditions via the
Chip Enable pin may produ ce tra ns ien t vo ltag e ex cu rs i ons .
Unless accommodated by the system design, these tran­sients may exceed data sheet limits, resulting in device
non-conforma nce. At a min imum, a 0. 1 µF high fr equency ,
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

VCC
GND
VPP

OE
CE

A0 - A17

ADDRESS

INPUTS

OE, CE AND

PROGRAM LOGIC

Y DECODER

X DECODER

DATA OUTPUTS

O0 - O15

OUTPUT

BUFFERS

Y-GATING

CELL MATRIX

IDENTIFICATION

2

AT27C2048

Absolute Maximum Ratings*

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

Vo ltage on A9 with

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

AT27C2048

*NOTICE: Stresses beyond those listed under “Absolute Maxi-

mum 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 condi-

(1)

(1)

tions 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: Maximum v oltag e is -0.6 V dc whic h ma y unders hoot to -2 .0V for pulses of less than 20 ns. Maxim um out put pin voltage is VCC +

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

Operating Modes

Mode/Pin CE OE PGM Ai V

Read V

IL

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

IH

V

IL

IL

IH

V

IL

V

IL

IH

XX X X

V

IH

V

IL

XX X VPPHigh Z

V

IL

(1)

X

Ai X

X X X High Z

V

IL

V

IH

X

Ai V
Ai V

A9 = V

(3)

H

A0 = VIH or VIL

A1 - A16 = V

IL

2. Refer to the Programming characteristics.

3. VH = 12.0 ± 0.5V.

4. Two identifier words m ay be selected. All Ai inputs are hel d low (V
) to select the Manufacturer’s Identification word and high (VIH) to select the Device Code word.

low (V

IL

), except A9, which is set to VH, and A0, which is togg le d

IL

5. Standby VCC current (ISB) is specified with VPP = VCC. VCC > VPP will cause a slight increase in ISB.

V

Outputs

PP

(1)

D

OUT

(5)

High Z
D

PP

PP

CC

IN

D

OUT

Identific ation Code

DC and AC Operating Conditions for Read Operation

AT27C2048

-55 -70 -90 -12 -15

Operating
Temperature (Case)

Power Supply 5V ± 10% 5V ± 10% 5V ± 10% 5V ± 10% 5V ± 10%

V

CC

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

DC and Operating Characteristics for Read Operation

Symbol Parameter Condition Min Max Units

I

LI

I

LO

(2)

I

PP1

I

SB

ICCVCC Active Current f = 5 MHz, I
V

IL

V

IH

V

OL

V

OH

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

I

(CMOS)

SB1

CE

= V

I

(TTL)

SB2

CE

= 2.0 to V

CC

CC

± 0.3V

CC

CC

+ 0.5V

CC

= 0 mA, CE = V

OUT

IL

± 1 µA
± 5 µA

10 µA

100 µA

1mA

35 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 I

= -400 µA2.4V

OH

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

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

AC Characteristics for Read Operat ion

AT27C2048

-55 -70 -90 -12 -15

Symbol Parameter Condition

t

t
t

t

t

ACC

CE

OE

DF

OH

(3)

(2)

(2)(3)

(4)(5)

(4)

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 f irst
Output Hold from Address, CE or OE,

whichever occurred f irst

CE = OE

= V

IL

IL

IL

Min Max Min Max Min Max Min Max Min Max

55 70 90 120 150 ns

55 70 90 120 150 ns
20 30 35 40 50 ns

20 20 20 30 35 ns

77000ns

Note: 2, 3, 4, 5. See the AC Waveforms for Read Operation diagram.

Units

4

AT27C2048

AT27C2048

AC Waveforms for Read Operation

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

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

3. OE may be delayed up to t

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.

- tOE after the address is valid without impact on t

ACC

Input Test Waveforms and

(1)

.

ACC

Output Test Load

Measurement Levels

For -55 de vices only:

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

t

R

For -70, -90, -12 and -15 devices:

t

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

R

Note: CL = 100 pF including jig capacita nce, e x cept f or the -55

devices, where CL = 30 pF.

Pin Capacitance

f = 1 MHz, T = 25°C

Symbol Ty p 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.

(1)

410pFV
812pFV

IN

OUT

= 0V

= 0V

5

Programming Waveforms

(1)

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

2. tOE and t

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

DFP

3. When programming the AT27C2048, a 0.1 µF capacitor is required across VPP and ground to suppress spurious voltage
transients.

DC Programming Characteristics

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

Symbol Parameter Test Conditions

I

LI

V

IL

V

IH

V

OL

V

OH

I

CC2

I

PP2

V

ID

Input Load Current VIN = VIL, V

IH

Input Low Level -0.6 0.8 V
Input High Level 2.0 V
Output Low Voltage IOL = 2.1 mA 0.4 V
Output High Voltage IOH = -400 µA2.4 V
VCC Supply Current (Program and Veri fy) 50 mA
VPP Supply Current CE = V

IL

A9 Product Identification Voltage 11.5 12.5 V

Limits

10

±

+ 0.5 V

CC

30 mA

UnitsMin Max

A

µ

6

AT27C2048

AC Programming Characteristics

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

Symbol Parameter Test Conditions

AT27C2048

Limits

(1)

UnitsMin Max

t

AS

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
OE Setup Time 2 µs
Data Setup Time 2 µs

Input Rise and Fall Times

(10% to 90%) 20 ns

Address Hold Time 0 µs
Data Hold Time 2 µs
OE High to Output Float Delay

(2)

VPP Setup Time 2 µs
VCC Setup Time 2 µs
PGM Program Pulse Width

(3)

Data Valid from OE 150 ns

Input Pulse Levels

0.45V to 2.4V

Input Timing Reference Level

0.8V to 2.0 V

Output Timing Reference Level

0.8V to 2.0 V
VPP Pulse Rise Time During
Programming

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

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 50 µsec ± 5%.

Atmel’s 27C2048 Intergrated Product Identification Code

Pins

Codes

2 µs

0 130 ns

47.5 52.5 µs

50 ns

Hex DataA0 O15-O8 O7 O6 O5 O4 O3 O2 O1 O0

Manufacturer 0 0 00011110 001E
Device Type 1 0 11110111 00F7

7

Rapid Programming Algorithm

A 50 µs CE pulse width is used to pr ogram . Th e add re ss is
set to the first loca tion. V
raised to 13.0V. Each address is first programmed with one
50 µs CE
tion/reprogramming loop is execu ted for ea ch address . In
the event a word fails to pass verifi catio n, up to 10 s ucces­sive 50 µs pulses are applied with a verification after each

pulse without verification. Then a verifica-

is raised to 6. 5V and VPP is

CC

pulse. If the word fails to verify after 10 p ulses have be en
applied, the part is considered failed. After the word verifies
properly, the next address is selected until all have been
checked. V
words are read again and compared with the original data
to determine if the device passes or fails.

is then lowered to 5.0V and VCC to 5.0V. All

PP

8

AT27C2048

Ordering Information

AT27C2048

t

ACC

(ns)

55 35 0.1 AT27C2048-55JC

70 35 0.1 AT27C2048-70JC

90 35 0.1 AT27C2048-90JC

ICC (mA)

Ordering Code Package Operation RangeActive Standby

AT27C2048-55PC
AT27C2048-55VC

35 0.1 AT27C2048-55JI

AT27C2048-55PI
AT27C2048-55VI

AT27C2048-70PC
AT27C2048-70VC

35 0.1 AT27C2048-70JI

AT27C2048-70PI
AT27C2048-70VI

AT27C2048-90PC
AT27C2048-90VC

35 0.1 AT27C2048-90JI

AT27C2048-90PI
AT27C2048-90VI

44J
40P6
40V

44J
40P6
40V

44J
40P6
40V

44J
40P6
40V

44J
40P6
40V

44J
40P6
40V

Commercial

(0°C to 70°C)

Industrial

(-40°C to 85°C)

Commercial

(0°C to 70°C)

Industrial

(-40°C to 85°C)

Commercial

(0°C to 70°C)

Industrial

(-40°C to 85°C)

120 35 0.1 AT27C2048-12JC

AT27C2048-12PC
AT27C2048-12VC

35 0.1 AT27C2048-12JI

AT27C2048-12PI
AT27C2048-12VI

150 35 0.1 AT27C2048-15JC

AT27C2048-15PC
AT27C2048-15VC

35 0.1 AT27C2048-15JI

AT27C2048-15PI
AT27C2048-15VI

Package Type

44J 44-Lead, Plastic J-Leaded Chip Carrier (PLCC)
40P6 40-Lead, 0.600" Wide, Plastic Dual Inline Package (PDIP)

44J
40P6
40V

44J
40P6
40V

44J
40P6
40V

44J
40P6
40V

Commercial

(0°C to 70°C)

Industrial

(-40°C to 85°C)

Commercial

(0°C to 70°C)

Industrial

(-40°C to 85°C)

40V 40-Lead, Plastic Thin Small Outline Package (VSOP) 10 x 14 mm

9

Packaging Information

44J

, 44-Lead, Plastic J-Leaded Chip Carier (PLCC)

Dimensions in Inches and (Millimeters)

JEDEC STANDARD MS-018 AC

.045(1.14) X 45°

.032(.813)
.026(.660)

.050(1.27) TYP

PIN NO.1
IDENTIFY

.045(1.14) X 30° - 45°

.656(16.7)

SQ

.650(16.5)

.695(17.7)
.685(17.4)

.500(12.7) REF SQ

.022(.559) X 45° MAX (3X)

SQ

.012(.305)
.008(.203)

.630(16.0)

.590(15.0)
.021(.533)
.013(.330)

.043(1.09)
.020(.508)

.120(3.05)

.090(2.29)
.180(4.57)
.165(4.19)

40P6

, 40-Lead, 0.600" Wide, Plastic Dual Inline
Package (PDIP)
Dimensions in Inches and (Millimeters)

JEDEC STANDARD MS-011 AC

2.07(52.6)

.220(5.59)

SEATING

PLANE

.161(4.09)
.125(3.18)

MAX

.110(2.79)
.090(2.29)

.012(.305)
.008(.203)

2.04(51.8)

1.900(48.26) REF

.065(1.65)
.041(1.04)

.630(16.0)
.590(15.0)

.690(17.5)
.610(15.5)

PIN

0

REF

15

1

.566(14.4)
.530(13.5)

.090(2.29)

.005(.127)

.065(1.65)
.015(.381)

.022(.559)
.014(.356)

MAX

MIN

40V

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

JEDEC OUTLINE MO-142 CA

10

AT27C2048

AT27C2048

11

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Corporate Headquarters

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TEL [phone]
FAX [phone]

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TEL [phone]
FAX [phone]

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TEL [phone]
FAX [phone]

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TEL [phone]
FAX [phone]

Fax-on-Demand

North America:
1-[phone]

International:
1-[phone]

e-mail

[e-mail]

Web Site

http://www.atmel.com

BBS

1-[phone]

© Atmel Corporation 1998.

Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company’s standard war­ranty which is detailed in Atmel’s Terms and Conditions located on the Company’s website. The Company assumes no responsibility for
any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without
notice, and does not make any commitment to update the information contained herein. No licenses to patents or other intellectual prop­erty of Atmel are granted by the Company in connection with the sale of Atmel products, expressly or by implication. Atmel’s products are
not authorized for use as critical components in life support devices or systems.

®

Marks bearing
Terms and product names in this document may be trademarks of others.

and/or ™ are registered trademarks and trademarks of Atmel Corporation.

Printed on recycled paper.

0632C–10/98/xM