Features
•Single Voltage, Range 3V to 3.6V Supply
•3-volt Only Read and Write Operation
•Software Protected Programming
•Fast Read Access Time – 100 ns
•Low Power Dissipation
– 15 mA Active Current
– 50 µA CMOS Standby Current
•Sector Program Operation
– Single Cycle Reprogram (Erase and Program)
– 1024 Sectors (256 Bytes/Sector)
– Internal Address and Data Latches for 256 Bytes
•Two 8K Bytes Boot Blocks with Lockout
•Fast Sector Program Cycle Time – 20 ms
•Internal Program Control and Timer
•DATA Polling for End of Program Detection
•Typical Endurance > 10,000 Cycles
•CMOS and TTL Compatible Inputs and Outputs
•Green (Pb/Halide-free) Packaging Option
1. Description
The AT29LV020 is a 3-volt-only in-system Flash programmable and erasable read
only memory (PEROM). Its 2 megabits of memory is organized as 262,144 bytes by
8 bits. Manufactured with Atmel’s advanced nonvolatile CMOS technology, the device
offers access times to 100 ns with power dissipation of just 54 mW over the industrial
temperature range. When the device is deselected, the CMOS standby current is less
than 50µA. The device endurance is such that any sector can typically be written to in
excess of 10,000 times.
To allow for simple in-system reprogrammability, the AT29LV020 does not require
high input voltages for programming. Five-volt-only commands determine the opera-
tion of the device. Reading data out of the device is similar to reading from an
EPROM. Reprogramming the AT29LV020 is performed on a sector basis; 256 bytes
of data are loaded into the device and then simultaneously programmed.
During a reprogram cycle, the address locations and 256 bytes of data are captured at
microprocessor speed and internally latched, freeing the address and data bus for
other operations. Following the initiation of a program cycle, the device will automati-
cally erase the sector and then program the latched data using an internal control
timer. The end of a program cycle can be detected by DATA polling of I/O7. Once the
end of a program cycle has been detected, a new access for a read or program can
begin.
2-megabit
(256K x 8)
3-volt Only
Flash Memory
AT29LV020
0565E–FLASH–9/08
Not Recommended
for New Design
Contact Atmel to discuss
the latest design in trends
and options
2
0565E–FLASH–9/08
AT29LV020
2. Pin Configurations
2.1 32-lead PLCC Top View
2.2 32-lead TSOP (Type 1) Top View
Pin Name Function
A0 - A17 Addresses
CE Chip Enable
OE Output Enable
WE Write Enable
I/O0 - I/O7 Data Inputs/Outputs
NC No Connect
5
6
7
8
9
10
11
12
13
29
28
27
26
25
24
23
22
21
A7
A6
A5
A4
A3
A2
A1
A0
I/O0
A14
A13
A8
A9
A11
OE
A10
CE
I/O7
4
3
2
1
32
31
30
14
15
16
17
18
19
20
I/O1
I/O2
GND
I/O3
I/O4
I/O5
I/O6
A12
A15
A16
NC
VCC
WE
A17
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
A11
A9
A8
A13
A14
A17
WE
VCC
NC
A16
A15
A12
A7
A6
A5
A4
OE
A10
CE
I/O7
I/O6
I/O5
I/O4
I/O3
GND
I/O2
I/O1
I/O0
A0
A1
A2
A3
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AT29LV020
3. Block Diagram
4. Device Operation
4.1 Read
The AT29LV020 is accessed like an EPROM. When CE and OE are low and WE is high, the
data stored at the memory location determined by the address pins is asserted on the outputs.
The outputs are put in the high impedance state whenever CE or OE is high. This dual-line con-
trol gives designers flexibility in preventing bus contention.
4.2 Software Data Protection Programming
The AT29LV020 has 1024 individual sectors, each 256 bytes. Using the software data protec-
tion feature, byte loads are used to enter the 256 bytes of a sector to be programmed. The
AT29LV020 can only be programmed or reprogrammed using the software data protection fea-
ture. The device is programmed on a sector basis. If a byte of data within the sector is to be
changed, data for the entire 256-byte sector must be loaded into the device. The AT29LV020
automatically does a sector erase prior to loading the data into the sector. An erase command is
not required.
Software data protection protects the device from inadvertent programming. A series of three
program commands to specific addresses with specific data must be presented to the device
before programming may occur. The same three program commands must begin each program
operation. All software program commands must obey the sector program timing specifications.
Power transitions will not reset the software data protection feature, however the software fea-
ture will guard against inadvertent program cycles during power transitions.
Any attempt to write to the device without the 3-byte command sequence will start the internal
write timers. No data will be written to the device; however, for the duration of tWC, a read opera-
tion will effectively be a polling operation.
After the software data protection’s 3-byte command code is given, a byte load is performed by
applying a low pulse on the WE or CE input with CE or WE low (respectively) and OE high. The
address is latched on the falling edge of CE or WE, whichever occurs last. The data is latched by
the first rising edge of CE or WE.
The 256 bytes of data must be loaded into each sector. Any byte that is not loaded during the
programming of its sector will be erased to read FFH. Once the bytes of a sector are loaded into
the device, they are simultaneously programmed during the internal programming period. After
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0565E–FLASH–9/08
AT29LV020
the first data byte has been loaded into the device, successive bytes are entered in the same
manner. Each new byte to be programmed must have its high to low transition on WE (or CE)
within 150 µs of the low to high transition of WE (or CE) of the preceding byte. If a high to low
transition is not detected within 150 µs of the last low to high transition, the load period will end
and the internal programming period will start. A8 to A17 specify the sector address. The sector
address must be valid during each high to low transition of WE (or CE). A0 to A7 specify the byte
address within the sector. The bytes may be loaded in any order; sequential loading is not
required. Once a programming operation has been initiated, and for the duration of tWC, a read
operation will effectively be a polling operation.
4.3 Hardware Data Protection
Hardware features protect against inadvertent programs to the AT29LV020 in the following
ways: (a) VCC sense–ifV
CC is below 1.8V (typical), the program function is inhibited; (b) VCC
power on delay – once VCC has reached the VCC sense level, the device will automatically time
out 10 ms (typical) before programming; (c) Program inhibit – holding any one of OE low, CE
high or WE high inhibits program cycles; and (d) Noise filter – pulses of less than 15 ns (typical)
on the WE or CE inputs will not initiate a program cycle.
4.4 Input Levels
While operating with a 3.3V ±10% power supply, the address inputs and control inputs (OE, CE
and WE) may be driven from 0 to 5.5V without adversely affecting the operation of the device.
The I/O lines can be driven from 0 to 3.6V.
4.5 Product Identification
The product identification mode identifies the device and manufacturer as Atmel. It may be
accessed by hardware or software operation. The hardware operation mode can be used by an
external programmer to identify the correct programming algorithm for the Atmel product.
In addition, users may wish to use the software product identification mode to identify the part
(i.e., using the device code), and have the system software use the appropriate sector size for
program operations. In this manner, the user can have a common board design for 256K to
4-megabit densities and, with each density’s sector size in a memory map, have the system soft-
ware apply the appropriate sector size.
For details, see Operating Modes (for hardware operation) or Software Product Identification.
The manufacturer and device code is the same for both modes.
4.6 DATA Polling
The AT29LV020 features DATA polling to indicate the end of a program cycle. During a program
cycle an attempted read of the last byte loaded will result in the complement of the loaded data
on I/O7. Once the program cycle has been completed, true data is valid on all outputs and the
next cycle may begin. DATA polling may begin at any time during the program cycle.
4.7 Toggle Bit
In addition to DATA polling the AT29LV020 provides another method for determining the end of
a program or erase cycle. During a program or erase operation, successive attempts to read
data from the device will result in I/O6 toggling between one and zero. Once the program cycle
has completed, I/O6 will stop toggling and valid data will be read. Examining the toggle bit may
begin at any time during a program cycle.
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0565E–FLASH–9/08
AT29LV020
4.8 Optional Chip Erase Mode
The entire device can be erased by using a 6-byte software code. Please see Software Chip
Erase application note for details.
4.9 Boot Block Programming Lockout
The AT29LV020 has two designated memory blocks that have a programming lockout feature.
This feature prevents programming of data in the designated block once the feature has been
enabled. Each of these blocks consists of 8K bytes; the programming lockout feature can be set
independently for either block. While the lockout feature does not have to be activated, it can be
activated for either or both blocks.
These two 8K memory sections are referred to as boot blocks. Secure code which will bring up a
system can be contained in a boot block. The AT29LV020 blocks are located in the first 8K bytes
of memory and the last 8K bytes of memory. The boot block programming lockout feature can
therefore support systems that boot from the lower addresses of memory or the higher
addresses. Once the programming lockout feature has been activated, the data in that block can
no longer be erased or programmed; data in other memory locations can still be changed
through the regular programming methods. To activate the lockout feature, a series of seven
program commands to specific addresses with specific data must be performed. Please see
Boot Block Lockout Feature Enable Algorithm.
If the boot block lockout feature has been activated on either block, the chip erase function will
be disabled.
4.9.1 Boot Block Lockout Detection
A software method is available to determine whether programming of either boot block section is
locked out. See Software Product Identification Entry and Exit sections. When the device is in
the software product identification mode, a read from location 00002H will show if programming
the lower address boot block is locked out while reading location 3FFF2H will do so for the upper
boot block. If the data is FE, the corresponding block can be programmed; if the data is FF, the
program lockout feature has been activated and the corresponding block cannot be pro-
grammed. The software product identification exit mode should be used to return to standard
operation.
5. Absolute Maximum Ratings*
Temperature Under Bias ............................... -55C to +125C*NOTICE: Stresses beyond those listed under “Absolute
Maximum Ratings” may cause permanent dam-
age 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 this specification is not
implied. Exposure to absolute maximum rating
conditions for extended periods may affect
device reliability.
Storage Temperature..................................... -65C to +150C
All Input Voltages (including NC Pins)
with Respect to Ground ...................................-0.6V to +6.25V
All Output Voltages
with Respect to Ground .............................-0.6V to VCC + 0.6V
Voltage on A9 (including NC Pins)
with Respect to Ground ...................................-0.6V to +13.5V
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0565E–FLASH–9/08
AT29LV020
Notes: 1. After power is applied and VCC is at the minimum specified datasheet value, the system should wait 20 ms before an opera-
tional mode is started.
Notes: 1. X can be VIL or VIH.
2. Refer to AC Programming Waveforms.
3. VH= 12.0V ± 0.5V.
4. Manufacturer Code: 1F, Device Code: BA.
5. See details under Software Product Identification Entry/Exit.
6. DC and AC Operating Range
AT29LV020-10 AT29LV020-20
Operating Temperature (Case) Industrial -40C-85C -40C-85C
VCC Power Supply(1) 3.3V ± 0.3V 3.3V ± 0.3V
7. Operating Modes
Mode CE OE WE Ai I/O
Read VIL VIL VIH Ai DOUT
Program(2) VIL VIH VIL Ai DIN
Standby/Write Inhibit VIH X(1) X X High Z
Program Inhibit X X VIH
Program Inhibit X VIL X
Output Disable X VIH X High Z
Product Identification
Hardware VIL VIL VIH
A1 - A17 = VIL,A9=V
H(3),A0=V
IL Manufacturer Code(4)
A1 - A17 = VIL,A9=V
H(3),A0=V
IH Device Code(4)
Software(5) A0 = VIL Manufacturer Code(4)
A0 = VIH Device Code(4)
8. DC Characteristics
Symbol Parameter Condition Min Max Units
ILI Input Load Current VIN =0VtoV
CC 1µA
ILO Output Leakage Current VI/O =0VtoV
CC 1µA
ISB1 VCC Standby Current CMOS CE = VCC - 0.3V to VCC 50 µA
ISB2 VCC Standby Current TTL CE = 2.0V to VCC 1mA
ICC VCC Active Current f = 5 MHz; IOUT = 0 mA; VCC = 3.6V 15 mA
VIL Input Low Voltage 0.6 V
VIH Input High Voltage 2.0 V
VOL Output Low Voltage IOL = 1.6 mA; VCC = 3.0V 0.45 V
VOH Output High Voltage IOH = -100 µA; VCC = 3.0V 2.4 V
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0565E–FLASH–9/08
AT29LV020
10. AC Read Waveforms(1)(2)(3)(4)
Notes: 1. CE may be delayed up to tACC -t
CE after the address transition without impact on tACC.
2. OE may be delayed up to tCE -t
OE after the falling edge of CE without impact on tCE or by tACC -t
OE after an address change
without impact on tACC.
3. tDF is specified from OE or CE whichever occurs first (CL = 5 pF).
4. This parameter is characterized and is not 100% tested.
9. AC Read Characteristics
Symbol Parameter
AT29LV020-10 AT29LV020-20
UnitsMin Max Min Max
tACC Address to Output Delay 100 200 ns
tCE(1) CE to Output Delay 100 200 ns
tOE(2) OE to Output Delay 0 40 0 100 ns
tDF(3)(4) CE or OE to Output Float 0 25 0 50 ns
tOH
Output Hold from OE, CE or Address,
Whichever Occurred First 00ns
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0565E–FLASH–9/08
AT29LV020
15. AC Byte Load Waveforms(1)(2)
15.1 WE Controlled
15.2 CE Controlled
Notes: 1. The software data protection commands must be applied prior to byte loads.
2. A complete sector (256 bytes) should be loaded using these waveforms as shown in the Software Protected Byte Load
waveforms (see next page).
14. AC Byte Load Characteristics
Symbol Parameter Min Max Units
tAS,t
OES Address, OE Set-up Time 10 ns
tAH Address Hold Time 100 ns
tCS Chip Select Set-up Time 0 ns
tCH Chip Select Hold Time 0 ns
tWP Write Pulse Width (WE or CE) 200 ns
tDS Data Set-up Time 100 ns
tDH,t
OEH Data, OE Hold Time 10 ns
tWPH Write Pulse Width High 200 ns
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0565E–FLASH–9/08
AT29LV020
17. Software Protected Program Waveform
Notes: 1. A8 through A17 must specify the sector address during each high to low transition of WE (or CE) after the software code has
been entered.
2. OE must be high when WE and CE are both low.
3. All bytes that are not loaded within the sector being programmed will be indeterminate.
18. Programming Algorithm(1)
16. Program Cycle Characteristics
Symbol Parameter Min Max Units
tWC Write Cycle Time 20 ms
tAS Address Set-up Time 10 ns
tAH Address Hold Time 100 ns
tDS Data Set-up Time 100 ns
tDH Data Hold Time 10 ns
tWP Write Pulse Width 200 ns
tBLC Byte Load Cycle Time 150 µs
tWPH Write Pulse Width High 200 ns
Byte 0 Byte 254 Byte 255
Notes: 1. Data Format: I/O7 - I/O0 (Hex);
Address Format: A14 - A0 (Hex).
2. Data Protect state will be re-activated at end of
program cycle.
3. 256 bytes of data MUST BE loaded.
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA A0
TO
ADDRESS 5555
LOAD DATA
TO
SECTOR (256 BYTES)(3)
WRITES ENABLED
ENTER DATA
PROTECT STATE(2)
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0565E–FLASH–9/08
AT29LV020
Notes: 1. These parameters are characterized and not 100% tested.
2. See tOE spec in AC Read Characteristics.
20. Data Polling Waveforms
Notes: 1. These parameters are characterized and not 100% tested.
2. See tOE spec in AC Read Characteristics.
22. Toggle Bit Waveforms(1)(3)
Notes: 1. Toggling either OE or CE or both OE and CE will operate toggle bit.
2. Beginning and ending state of I/O6 will vary.
3. Any address location may be used but the address should not vary.
19. Data Polling Characteristics(1)
Symbol Parameter Min Typ Max Units
tDH Data Hold Time 10 ns
tOEH OE Hold Time 10 ns
tOE OE to Output Delay(2) ns
tWR Write Recovery Time 0 ns
21. Toggle Bit Characteristics(1)
Symbol Parameter Min Typ Max Units
tDH Data Hold Time 10 ns
tOEH OE Hold Time 10 ns
tOE OE to Output Delay(2) ns
tOEHP OE High Pulse 150 ns
tWR Write Recovery Time 0 ns
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0565E–FLASH–9/08
AT29LV020
23. Software Product Identification
Entry(1)
24. Software Product Identification
Exit(1)
Notes: 1. Data Format: I/O7 - I/O0 (Hex);
Address Format: A14 - A0 (Hex).
2. A1 - A17 = VIL.
Manufacturer Code is read for A0 = VIL;
Device Code is read for A0 = VIH.
3. The device does not remain in identification mode if
powered down.
4. The device returns to standard operation mode.
5. Manufacturer Code is 1F. The Device Code is BA.
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA 90
TO
ADDRESS 5555
PAUSE 20 mS ENTER PRODUCT
IDENTIFICATION
MODE(2)(3)(5)
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA F0
TO
ADDRESS 5555
PAUSE 20 mS EXIT PRODUCT
IDENTIFICATION
MODE
(4)
25. Boot Block Lockout
Feature Enable Algorithm(1)
Notes: 1. Data Format: I/O7 - I/O0 (Hex);
Address Format: A14 - A0 (Hex).
2. Lockout feature set on lower address boot block.
3. Lockout feature set on higher address boot block.
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA 80
TO
ADDRESS 5555
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA 40
TO
ADDRESS 5555
LOAD DATA 00
TO
ADDRESS 00000H
(2)
PAUSE 20 mS
LOAD DATA FF
TO
ADDRESS 3FFFFH
(3)
PAUSE 20 mS
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0565E–FLASH–9/08
AT29LV020
26. Ordering Information
26.1 Green Package Option (Pb/Halide-free)
tACC
(ns)
ICC (mA)
Ordering Code Package Operation RangeActive Standby
100 15 0.05 AT29LV020-10JU
AT29LV020-10TU
32J
32T Industrial
(-40to 85C)
200 15 0.05 AT29LV020-20JU
AT29LV020-20TU
32J
32T
Package Type
32J 32-lead, Plastic J-leaded Chip Carrier (PLCC)
32T 32-lead, Thin Small Outline Package (TSOP)
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0565E–FLASH–9/08
AT29LV020
27. Packaging Information
27.1 32J – PLCC
DRAWING NO. REV.
2325 Orchard Parkway
San Jose, CA 95131
R
TITLE
32J, 32-lead, Plastic J-leaded Chip Carrier (PLCC) B
32J
10/04/01
1.14(0.045) X 45 PIN NO. 1
IDENTIFIER
1.14(0.045) X 45
0.51(0.020)MAX
0.318(0.0125)
0.191(0.0075)
A2
45 MAX (3X)
A
A1
B1 E2
B
e
E1 E
D1
D
D2
COMMON DIMENSIONS
(Unit of Measure = mm)
SYMBOL MIN NOM MAX NOTE
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 (0.254 mm) 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 (0.102 mm) maximum.
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
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0565E–FLASH–9/08
AT29LV020
27.2 32T – TSOP
2325 Orchard Parkway
San Jose, CA 95131
TITLE DRAWING NO.
R
REV.
32T, 32-lead (8 x 20 mm Package) Plastic Thin Small Outline
Package, Type I (TSOP) B
32T
10/18/01
PIN 1
D1 D
Pin 1 Identifier
b
e
EA
A1
A2
0º ~ 8º c
L
GAGE PLANE
SEATING PLANE
L1
COMMON DIMENSIONS
(Unit of Measure = mm)
SYMBOL MIN NOM MAX NOTE
Notes: 1. This package conforms to JEDEC reference MO-142, Variation BD.
2. Dimensions D1 and E do not include mold protrusion. Allowable
protrusion on E is 0.15 mm per side and on D1 is 0.25 mm per side.
3. Lead coplanarity is 0.10 mm maximum.
A – – 1.20
A1 0.05 – 0.15
A2 0.95 1.00 1.05
D 19.80 20.00 20.20
D1 18.30 18.40 18.50 Note 2
E 7.90 8.00 8.10 Note 2
L 0.50 0.60 0.70
L1 0.25 BASIC
b 0.17 0.22 0.27
c 0.10 – 0.21
e 0.50 BASIC
0565E–FLASH–9/08
Headquarters International
Atmel Corporation
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Japan
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Fax: (81) 3-3523-7581
Product Contact
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www.atmel.com
Technical Support
Flash@atmel.com
Sales Contact
www.atmel.com/contacts
Literature Requests
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