Page 1
Features
• Fast Read Access Time - 55ns
• 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 VCC = 3.6V
= 3.6V
CC
• JEDEC Standard Packages
– 32-lead PLCC
– 28-lead 330-mil 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
• Commercial and Industrial Temperature Ranges
Description
The AT27LV256A is a high performance, low power, low voltage 262,144-bit one-time
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,
(continued)
256K (32K x 8)
Low-voltage
OTP EPROM
AT27LV256A
Pin Configurations
Pin Name Function
A0 - A14 Addresses
O0 - O7 Outputs
CE
OE Output Enable
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
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
OE
A11
A13
A14
VCC
VPP
A12
SOIC Top View
VPP
A12
GND
A7
A6
A5
A4
A3
A2
A1
A0
O0
O1
O2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
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
TSOP Top View
Type 1
22
23
24
A9
25
A8
26
27
28
1
2
3
A7
4
A6
5
A5
6
A4
7
A3
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
Rev. 0547C–05/00
1
Page 2
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
= 3.0V, any byte can be
CC
accessed in less than 55 ns. With a typical power dissipation of only 18 mW at 5 MHz and V
= 3.3V, the
CC
AT27LV256A consumes less than one fifth the power of a
standard 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
, OE) to give designers the flexibility to prevent
bus contention.
The AT27LV256A operating with V
at 3.0V produces TTL
CC
level outputs that are compatible with standard TTL logic
devices operating at V
= 5.0V. The device is also capa-
CC
ble 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.
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 data sheet limits, resulting in device
non-conformance. At a minimum, a 0.1
low inherent inductance, ceramic capacitor should be utilized for each device. This capacitor should be connected
between the V
and Ground terminals of the device, as
CC
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.
µF high frequency,
and Ground
CC
Block Diagram
2
AT27LV256A
Page 3
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
AT27LV256A
*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
(1)
(1)
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
VPP Supply Voltage with
Respect to Ground .......................................-2.0V to +14.0V
(1)
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
+ 0.75V DC which may be exceeded if certain precautions are observed (consult application notes) and which may
V
CC
overshoot to +7.0V for pulses of less than 20 ns.
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
Notes: 1. X can be V
2. Read, output disable, and standby modes require, 3.0V ≤ V
3. Refer to Programming Characteristics. Programming modes require V
(3)
(3)(5)
IL
or VIH.
V
IL
V
IL
V
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
(4)
H
A0 = VIH or VIL
A1 - A14 = V
≤ 3.6V, or 4.5V ≤ VCC ≤ 5.5V.
CC
IL
CC
4. VH = 12.0 ± 0.5V.
5. Two identifier bytes may be selected. All Ai inputs are held low (V
) to select the Manufacturer’s Identification byte and high (VIH) to select the Device Code byte.
low (V
IL
), except A9 which is set to VH and A0 which is toggled
IL
PP
CC
V
CC
V
CC
PP
PP
CC
V
PP
V
CC
= 6.5V.
V
CC
(2)
V
CC
(2)
V
CC
(2)
V
CC
(3)
V
CC
(3)
V
CC
(3)
V
CC
(3)
V
CC
(3)
V
CC
Outputs
D
OUT
High Z
High Z
D
IN
D
OUT
D
OUT
High Z
Identification Code
3
Page 4
DC and AC Operating Conditions for Read Operation
AT27LV256A
-55 -70 -90 -12 -15
Operating Temperature
(Case)
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
3.0V to 3.6V 3.0V to 3.6V 3.0V to 3.6V 3.0V to 3.6V 3.0V to 3.6V
Power Supply
V
CC
5V ± 10% 5V ± 10% 5V ± 10% 5V ± 10% 5V ± 10%
DC and Operating Characteristics for Read Operation
Symbol Parameter Condition Min Max Units
VCC = 3.0V to 3.6V
I
LI
I
LO
(2)
I
PP1
I
SB
I
CC
V
IL
V
IH
V
OL
V
OH
V
= 4.5V to 5.5V
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
I
(TTL), CE = 2.0 to VCC + 0.5V 100 µA
SB2
VCC Active Current f = 5 MHz, I
CC
CC
CC=±
= 0 mA, CE = V
OUT
0.3V 20 µA
IL
±1 µA
±5 µA
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
I
(TTL), CE = 2.0 to VCC + 0.5V 1 mA
SB2
VCC Active Current f = 5 MHz, I
CC
CC
= 0 mA, CE = V
OUT
IL
±1 µA
±5 µA
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 µA2.4V
2. V
may be connected directly to VCC, except during programming. The supply current would then be the sum of ICC and IPP.
PP
4
AT27LV256A
Page 5
AC Characteristics for Read Operation
VCC = 3.0V to 3.6V and 4.5V to 5.5V
-55 -70 -90 -12 -15
Symbol Parameter Condition
t
t
t
t
ACC
CE
OE
DF
(3)
(2)
(2)(3)
(4)(5)
Address to Output
Delay
= OE = V
CE
CE to Output Delay OE = V
OE to Output Delay CE = V
OE or CE High to
Output Float, whichever
IL
IL
occurred first
Output Hold from
t
OH
Address, CE
or OE,
whichever occurred first
Max Min Min Max Min Max Min Max Min Max
IL
00000 ns
AT27LV256A
AT27LV256A
Units
55 70 90 120 150 ns
55 70 90 120 150 ns
35 50 50 50 60 ns
30 40 40 40 50 ns
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.
may be delayed up to tCE - tOE after the falling edge of CE without impact on tCE.
2. OE
3. OE
may be delayed up to t
- 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.
5
Page 6
Input Test Waveforms and
Output Test Load
Measurement Levels
, tF < 20 ns (10% to 90%)
t
R
Note: CL = 100 pF including
jig capacitance.
Pin Capacitance
f = 1 MHz, T = 25°C
Symbol 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.
(1)
48pFV
812pFV
IN
OUT
= 0V
= 0V
6
AT27LV256A
Page 7
AT27LV256A
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 AT27LV256A 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
V
V
V
V
I
I
V
LI
IL
IH
OL
OH
CC2
PP2
ID
Input Load Current VIN = VIL, V
IH
Input Low Level -0.6 0.8 V
Input High Level 2.0 VCC + 0.5 V
Output Low Voltage IOL = 2.1 mA 0.4 V
Output High Voltage I
= -400 =µA2.4 V
OH
VCC Supply Current (Program and Verify) 25 mA
VPP Current CE = V
IL
A9 Product Identification Voltage 11.5 12.5 V
Limits
UnitsMin Max
±10 µA
25 mA
7
Page 8
AC Programming Characteristics
TA = 25 ± 5°C, VCC = 6.5 ± 0.25V, VPP = 13.0 ± 0.25V
Symbol Parameter Test Conditions
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
Address Setup Time
OE Setup Time 2 µs
Input Rise and Fall Times:
Data Setup Time 2 µs
(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
CE Program Pulse Width
Data Valid from OE
(3)
(2)
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 µs
0 130 ns
95 105 µs
50 ns
Notes: 1. VCC must be applied simultaneously or before VPP and removed simultaneously or after VPP.
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 100
Atmel’s 27LV256A Integrated Product Identification Code
∫µsec=±=5%.
(1)
Pins
Codes
150 ns
Hex
DataA0 O7 O6 O5 O4 O3 O2 O1 O0
Manufacturer 000011110 1E
Device Type 1100011008C
Note: 1. The AT27LV256A has the same Product Identification Code as the AT27C256R. Both are programming compatible.
8
AT27LV256A
Page 9
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
µs CE pulse without verification. Then a verification /
100
reprogramming loop is executed for each address. In the
event a byte fails to pass verification, up to 10 successive
µs pulses are applied with a verification after each
100
is raised to 6.5V and VPP is
CC
AT27LV256A
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. 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
9
Page 10
Ordering Information
I
t
ACC
(ns)
55 8 0.02 AT27LV256A-55JC
70 8 0.02 AT27LV256A-70JC
90 8 0.02 AT27LV256A-90JC
120 8 0.02 AT27LV256A-12JC
150 8 0.02 AT27LV256A-15JC
(mA)
CC
Ordering Code Package Operation RangeActive Standby
AT27LV256A-55RC
AT27LV256A-55TC
8 0.02 AT27LV256A-55JI
AT27LV256A-55RI
AT27LV256A-55TI
AT27LV256A-70RC
AT27LV256A-70TC
8 0.02 AT27LV256A-70JI
AT27LV256A-70RI
AT27LV256A-70TI
AT27LV256A-90RC
AT27LV256A-90TC
8 0.02 AT27LV256A-90JI
AT27LV256A-90RI
AT27LV256A-90TI
AT27LV256A-12RC
AT27LV256A-12TC
8 0.02 AT27LV256A-12JI
AT27LV256A-12RI
AT27LV256A-12TI
AT27LV256A-15RC
AT27LV256A-15TC
8 0.02 AT27LV256A-15JI
AT27LV256A-15RI
AT27LV256A-15TI
32J
28R
28T
32J
28R
28T
32J
28R
28T
32J
28R
28T
32J
28R
28T
32J
28R
28T
32J
28R
28T
32J
28R
28T
32J
28R
28T
32J
28R
28T
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)
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
32J 32-lead, Plastic J-Leaded Chip Carrier (PLCC)
28R 28-lead, 0.330" Wide, Plastic Gull Wing Small Outline (SOIC)
28T 28-lead, Thin Small Outline Package (TSOP)
10
AT27LV256A
Page 11
Packaging Information
AT27LV256A
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)
.021(.533)
.013(.330)
.022(.559) X 45˚ MAX (3X)
.012(.305)
.008(.203)
.530(13.5)
.490(12.4)
.030(.762)
.015(.381)
.095(2.41)
.060(1.52)
.140(3.56)
.120(3.05)
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
Page 12
Atmel Headquarters Atmel Operations
Corporate Headquarters
2325 Orchard Parkway
San Jose, CA 95131
TEL (408) 441-0311
FAX (408) 487-2600
Europe
Atmel U.K., Ltd.
Coliseum Business Centre
Riverside Way
Camberley, Surrey GU15 3YL
England
TEL (44) 1276-686-677
FAX (44) 1276-686-697
Asia
Atmel Asia, Ltd.
Room 1219
Chinachem Golden Plaza
77 Mody Road Tsimhatsui
East Kowloon
Hong Kong
TEL (852) 2721-9778
FAX (852) 2722-1369
Japan
Atmel Japan K.K.
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1-24-8 Shinkawa
Chuo-ku, Tokyo 104-0033
Japan
TEL (81) 3-3523-3551
FAX (81) 3-3523-7581
Atmel Colorado Springs
1150 E. Cheyenne Mtn. Blvd.
Colorado Springs, CO 80906
TEL (719) 576-3300
FAX (719) 540-1759
Atmel Rousset
Zone Industrielle
13106 Rousset Cedex
France
TEL (33) 4-4253-6000
FAX (33) 4-4253-6001
Fax-on-Demand
North America:
1-(800) 292-8635
International:
1-(408) 441-0732
e-mail
literature@atmel.com
Web Site
http://www.atmel.com
BBS
1-(408) 436-4309
© Atmel Corporation 2000.
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 web site. 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.
0547B–05/98/xM
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