Rainbow Electronics AT27C256R User Manual

Features

•

Fast Read Access Time - 45 ns

•

Low-Power CMOS Operation

µµµµ

– 100

A max. Standby

– 20 mA max. Active at 5 MHz

•

JEDEC Standard Packages

– 28-Lead 600-mil PDIP
– 32-Lead PLCC
– 28-Lead TSOP and SOIC

±

•

5V

10% Supply

•

High Reliability CMOS Technology

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

•

Rapid™ Programming Algorithm - 100

•

CMOS and TTL Compatible Inputs and Outputs

•

Integrated Product Identification Code

•

Commercial, Industrial and Automotive Temperature Ranges

µµµµ

s/byte (typical)

Description

The AT27C256R is a low- pow er , high- pe rf orman ce 262,144-bit one-time pro gramm a­ble read only memory (OTP EPROM) organized 32K by 8 bits. It requires only one 5V
power supply in norm al read mo de operat ion. Any byt e can be acc essed in less than
45 ns, eliminating the n eed for speed reducing WAIT s tates on high-pe rformance
microprocessor systems.

Atmel’s scaled CMOS technolo gy provide s low-acti ve power c onsumptio n, and fast
programming. Power consumption is typically only 8 mA in Active Mode and less than
10 µA in Standby.

(continued)

Pin Configurations

Pin Name Function

A0 to A14 Addresses
O0 - O7 Outputs
CE
OE
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
Output En able

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

A11

A13

A14
VCC
VPP

A12

PDIP, SOIC Top View

VPP

A12

A7
A6
A5
A4
A3
A2
A1
A0
O0
O1
O2

GND

TSOP Top View

OE

22
23

A9

24

A8

25
26
27
28

1
2
3

A7

4

A6

5

A5

6

A4

7

A3

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

Type 1

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

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

256K (32K x 8)
OTP EPROM

AT27C256R

256K EPROM

Rev. 0014H–07/98

1

The AT27C256 R is ava ilable in a c hoice of indu stry st an­dard JEDEC-approved one time programmable (OTP)
plastic DIP, PLCC, SOIC, and TSOP packages. All devices
feature two-line control (CE
ibility to prevent bus contention.

With 32K byte storage capability, the AT27C256R allows
firmware to be stored reliably and to be accessed by the
system without the delays of mass storage media.

Atmel’s 27C256R has addit ional features to ensure high
quality and efficient producti on use. The Rapi d™ Progra m­ming Algori thm reduc es the time require d to prog ram the
part and guarantees reliable programming. Programming
time is typically only 100 µs/byte. The Integrated Product
Identification Code electronica lly identifi es the devic e and
manufacturer. This feature is used by industry standard
programming equi pmen t to se lect the prop er progr ammi ng
algorithms and voltages.

, OE) to give designers the flex-

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-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
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

2

AT27C256R

Block Diagram

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

Voltage on A9 with

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

VPP Supply Voltage with

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

AT27C256R

*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

(1)

(1)

Note: 1 . Minimum voltage is -0.6V dc which ma y unde rshoot

(1)

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.

to -2.0V for pulses of les s than 20 ns .Maximum out­put pin voltage is V

+ 0.75V dc which may over-

CC

shoot to +7.0 volts for pulses of less than 20 ns.

Operating Modes

Mode\Pin CE OE Ai V

Read V
Output Disable V
Standby V
Rapid Program
PGM Verify
Optional PGM Verify
PGM Inhibit

Product Identification

(2)

(2)

(2)

(2)

(4)

Notes: 1. X can be VIL or VIH.

2. Refer to Programming Characteristics.
= 12.0 ± 0.5V.

3. V

H

4. T wo identifier bytes may be selected. All Ai inputs are held low (VIL), except A9 which is set to VH and A0 which is toggle d low

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

(V

IL

IL

IL

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

(3)

H

A0 = VIH or VIL
A1 - A14 = V

IL

V

PP

CC

V

CC

V

CC

PP

PP

CC

V

PP

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

AT27C256R

-45 -55 -70 -90 -12 -15

Com. 0°C - 70°C0°C - 70°C0°C - 70°C0°C - 70°C0°C - 70°C0°C - 70°C
Operating
Temp. (Case)

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

Auto. -40°C - 125°C-40°C - 125°C-40°C - 125°C-40°C - 125°C
V

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

CC

DC and Operating Characteristics for Read Operation

Symbol Parameter Condition Min Max Units

I

LI

Input Load Current VIN = 0V to V

CC

Com., Ind. ±1 µA
Auto. ±5 µA

I

I

I

I
V
V
V
V

LO

PP1

SB

CC

IL

IH

OL

OH

(2)

Output Leakage Current V

(1)

V

Read/Standby Current VPP = V

PP

(1)

V

Standby Current

CC

VCC Active Current f = 5 MHz, I

= 0V to V

OUT

(CMOS), CE = VCC ± 0.3V 100 µA

I

SB1

I

(TTL), CE = 2.0 to V

SB2

CC

OUT

CC

CC

= 0 mA, E = V

Auto. ±10 µA

10 µA

+ 0.5V 1 mA

IL

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

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

Com., Ind. ±5 µA

may be connected directly to VCC, except d uring p r og r amming. The suppl y c urre nt w o ul d th en be the sum of ICC and IPP..

2. V

PP

AC Characteristics for Read Operat ion

AT27C256R

-45 -55 -70 -90 -12 -15

Symbol Parameter Condition Min Max Min Max Min Max Min Max Min Max Min Max

(3)

t
t
t

t

ACC

CE

OE

DF

(2)

(2)(3)

(4)(5)

Address to Output Delay CE = OE = V
CE to Output Delay OE = V
OE to Output Delay CE = V

IL

IL

OE or CE High to Output
Float, whichever occurred first

IL

45 55 70 90 120 150 ns
45 55 70 90 120 150 ns
20 25 30 30 35 40 ns

20 20 25 25 30 35 ns

Units

t

OH

Output Hold from Address, CE or OE,
whichever occurred first

777000ns

Note: 2, 3, 4, 5. - see AC Waveforms for Read Operation.

4

AT27C256R

AT27C256R

AC Waveforms for Read Operation

Notes: 1. Timing measurement reference level is 1.5V for -45 and -55 devices. Input AC drive levels are VIL = 0.0V and VIH = 3.0V.

Timing measurement reference levels for all other speed grades are V

= 0.45V and VIH = 2.4V.

V

IL

2. OE

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.

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

- tOE after the address is valid without impact on t

ACC

(1)

= 0.8V and VOH = 2.0V. Input AC drive levels are

OL

.

ACC

Input Test Waveforms and

Output Test Load

Measurement Levels

For -45 and -55 devices only:

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

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

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

Note: CL = 100 pF including jig

capacitanc e, except for
the -45 and -55 devices,
where C

=30 pF.

L

Pin Capacitance

(f = 1MHz, T = 25°C)

C

IN

C

OUT

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

(1)

Typ Max Units Conditions

46pFV
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 AT27C256R a 0.1 µF capacitor is required across V
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 V
Input Low Level -0.6 0.8 V
Input High Level 2.0 VCC + 1 V
Output Low Volt IOL = 2.1 mA 0.4 V
Output High Volt I
VCC Supply Current (Program and Verify) 25 mA
VPP Current CE = V
A9 Product Identification Voltage 11.5 12.5 V

= VIL,V

IN

OH

IH

= -400 µA2.4 V

IL

and ground to suppress spurious voltage

PP

Limits

UnitsMin Max

10

±

µ

25 mA

A

6

AT27C256R

AC Programming Characteristics

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

Symbol Parameter T est Conditions

AT27C256R

Limits

(1)

UnitsMin Max

t
t
t
t
t

t

t
t
t
t

t

AS

OES

DS

AH

DH

DFP

VPS

VCS

PW

OE

PRT

Address Setup Time
OE Setup Time 2
Data Setup Time 2
Address Hold Time 0
Data Hold Time 2
OE High to

Output Float Delay

(2)

VPP Setup Time 2
VCC Setup Time 2
CE Program Pulse Width
Data Valid from OE

(3)

(2)

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

2

0 130 ns

95 105

50 ns

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

2. This parameter i s only sam pled a nd is not 1 00 % teste d. Out put Flo at is d efined as the point where dat a is no longe r driv e n—

see timing diagram.

3. Program Pulse width tolerance is 100

µsec

±

5%.

Atmel’s 27C256R Integrated Product Identification Code

Pins

Codes

µ
µ
µ
µ
µ

µ
µ
µ

150 ns

s
s
s
s
s

s
s
s

Hex

DataA0 O7 O6 O5 O4 O3 O2 O1 O0

Manufacturer 0000111101E
Device Type 1100011008C

7

Rapid Programming Algorithm

A 100 µs CE pulse width is used to program. The address
is set to the first location. V
raised to 13.0V. Each address is first programmed with one
100 µs CE
tion/reprogramming loop is execu ted for ea ch address . In
the event a byte fails to pass verification, up to 10 succes­sive 100 µs pulses are applied with a verification after each

pulse with out verificati on. Then a ve rifica-

is raised to 6.5V and VPP is

CC

pulse. If the byte fails to verify after 10 pulses have been
applied, the part is c on sider e d f ail ed . A fter the b yte ver if ies
properly, the next address is selected until all have been
checked. V
bytes 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

AT27C256R

Ordering Information

I

t

ACC

(ns)

45 20 0.1 AT27C256R-4 5J C

55 20 0.1 AT27C256R-55JC

70 20 0.1 AT27C256R-70JC

(mA)

CC

Ordering Code Packa ge Operation RangeActive Standby

AT27C2 56R -4 5PC
AT27C2 56R -4 5R C
AT27C2 56R -4 5TC

20 0.1 AT27C256R-45JI

AT27C256R-45PI
AT27C256R-45RI
AT27C256R-45TI

AT27C256R-55PC
AT27C256R-55RC
AT27C256R-55TC

20 0.1 AT27C256R-55JI

AT27C256R-55PI
AT27C256R-55RI
AT27C256R-55TI

AT27C256R-70PC
AT27C256R-70RC
AT27C256R-70TC

20 0.1 AT27C256R-70JI

AT27C256R-70PI
AT27C256R-70RI
AT27C256R-70TI

20 0.1 AT27C256R-70JA

AT27C256R-70PA
AT27C256R-70RA

32J
28P6
28R
28T

32J
28P6
28R
28T

32J
28P6
28R
28T

32J
28P6
28R
28T

32J
28P6
28R
28T

32J
28P6
28R
28T

32J
28P6
28R

AT27C256R

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)

Automotive

(-40°C to 125°C)

Package Type

32J 32-Lead, Plastic J-Leaded Chip Carrier (PLCC)
28P6 28-Lead, 0.600" Wide, Plastic Dual Inline Package (PDIP)
28R 28-Lead, 0.330" Wide, Plastic Gull Wing Small Outline (SOIC)
28T 28-Lead, Thin Small Outline Package (TSOP)

(continued)

9

Ordering Information (Continued)

I

t

ACC

(ns)

90 20 0.1 AT27C256R-90JC

120 20 0.1 AT27C256R-12JC

150 20 0.1 AT27C256R-15JC

(mA)

CC

Ordering Code Packa ge Operation RangeActive Standby

AT27C256R-90PC
AT27C256R-90RC
AT27C256R-90TC

20 0.1 AT27C256R-90JI

AT27C256R-90PI
AT27C256R-90RI
AT27C256R-90TI

20 0.1 AT27C256R-90JA

AT27C256R-90PA
AT27C256R-90RA

AT27C256R-12PC
AT27C256R-12RC
AT27C256R-12TC

20 0.1 AT27C256R-12JI

AT27C256R-12PI
AT27C256R-12RI
AT27C256R-12TI

20 0.1 AT27C256R-12JA

AT27C256R-12PA
AT27C256R-12RA

AT27C256R-15PC
AT27C256R-15RC
AT27C256R-15TC

20 0.1 AT27C256R-15JI

AT27C256R-15PI
AT27C256R-15RI
AT27C256R-15TI

20 0.1 AT27C256R-15JA

AT27C256R-15PA
AT27C256R-15RA

32J
28P6
28R
28T

32J
28P6
28R
28T

32J
28P6
28R

32J
28P6
28R
28T

32J
28P6
28R
28T

32J
28P6
28R

32J
28P6
28R
28T

32J
28P6
28R
28T

32J
28P6
28R

Commercial

(0°C to 70°C)

Industrial

(-40°C to 85°C)

Automotive

(-40°C to 125°C)

Commercial

(0°C to 70°C)

Industrial

(-40°C to 85°C)

Automotive

(-40°C to 125°C)

Commercial

(0°C to 70°C)

Industrial

(-40°C to 85°C)

Automotive

(-40°C to 125°C)

Package Type

32J 32-Lead, Plastic J-Leaded Chip Carrier (PLCC)
28P6 28-Lead, 0.600" Wide, Plastic Dual Inline Package (PDIP)
28R 28-Lead, 0.330" Wide, Plastic Gull Wing Small Outline (SOIC)
28T 28-Lead, Thin Small Outline Package (TSOP)

10

AT27C256R

Packaging Information

AT27C256R

32J

, 32-Lead, Plastic J-Leaded Chip Carrier (PLCC)

Dimensions in Inches and (Millimeters)

JEDEC STANDARD MS-016 AE

.045(1.14) X 45°

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

.050(1.27) TYP

PIN NO.1
IDENTIFY

.553(14.0)
.547(13.9)

.300(7.62) REF

.430(10.9)
.390(9.90)

AT CONTACT
POINTS

.453(11.5)
.447(11.4)

.495(12.6)
.485(12.3)

.025(.635) X 30° - 45°

.595(15.1)
.585(14.9)

.022(.559) X 45° MAX (3X)

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

.530(13.5)
.490(12.4)

.021(.533)
.013(.330)

.030(.762)
.015(3.81)
.095(2.41)

.060(1.52)
.140(3.56)
.120(3.05)

28P6

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

JEDEC STANDARD MS-011 AB

1.47(37.3)

.220(5.59)

SEATING

PLANE

.161(4.09)
.125(3.18)

MAX

.110(2.79)
.090(2.29)

.012(.305)

.008(.203)

1.44(36.6)

1.300(33.02) 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

28R

, 28-Lead, 0.330" Wide, Plastic Gull Wing Small
Outline (SOIC)
Dimensions in Inches and (Millimeters)

28T

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

INDEX
MARK

AREA

0.55 (0.022)
BSC

0

REF

5

7.15 (0.281)
REF

8.10 (0.319)

7.90 (0.311)

0.20 (0.008)

0.10 (0.004)

0.70 (0.028)

0.30 (0.012)

11.9 (0.469)

11.7 (0.461)

0.27 (0.011)

0.18 (0.007)

13.7 (0.539)

13.1 (0.516)

1.25 (0.049)

1.05 (0.041)

0.20 (0.008)

0.15 (0.006)

*Controlling dimension: millimeters

11

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North America:
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International:
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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.

0014H–07/98/xM