AT29LV020-20TU

AT29LV020-20TU Datasheet


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 50µA. The device endurance is such that any sector can typically be written to in excess of 10,000 times.

Part Datasheet
AT29LV020-20TU AT29LV020-20TU AT29LV020-20TU (pdf)
Related Parts Information
AT29LV020-10TU-T AT29LV020-10TU-T AT29LV020-10TU-T
AT29LV020-10JU-T AT29LV020-10JU-T AT29LV020-10JU-T
AT29LV020-10JU AT29LV020-10JU AT29LV020-10JU
AT29LV020-10TU AT29LV020-10TU AT29LV020-10TU
PDF Datasheet Preview
• 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

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 50µA. 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 operation 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 automatically 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

Not Recommended for New Design

Contact Atmel to discuss the latest design in trends and options

Pin Configurations

Pin Name A0 - A17 CE OE WE I/O0 - I/O7 NC
32-lead PLCC Top View

Function Addresses Chip Enable Output Enable Write Enable Data Inputs/Outputs No Connect
4 A12 3 A15 2 A16 1 NC 32 VCC 31 WE 30 A17

A7 5 A6 6 A5 7 A4 8 A3 9 A2 10 A1 11 A0 12 I/O0 13
32-lead TSOP Type 1 Top View

A11 1 A9 2 A8 3

A13 4 A14 5 A17 6 WE 7 VCC 8 NC 9 A16 10 A15 11 A12 12

A7 13 A6 14 A5 15 A4 16

I/O1 14 I/O2 15 GND 16 I/O3 17 I/O4 18 I/O5 19 I/O6 20
29 A14 28 A13 27 A8 26 A9 25 A11 24 OE 23 A10 22 CE 21 I/O7
32 OE 31 A10 30 CE 29 I/O7 28 I/O6 27 I/O5 26 I/O4 25 I/O3 24 GND 23 I/O2 22 I/O1 21 I/O0 20 A0 19 A1 18 A2 17 A3
2 AT29LV020

Block Diagram

AT29LV020

Device Operation

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 control gives designers flexibility in preventing bus contention.

Software Data Protection Programming

The AT29LV020 has 1024 individual sectors, each 256 bytes. Using the software data protection 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 feature. 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 feature 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 operation 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
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.

Hardware Data Protection

Hardware features protect against inadvertent programs to the AT29LV020 in the following ways a VCC sense if VCC 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.

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.

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 software apply the appropriate sector size.
Ordering Information

Green Package Option Pb/Halide-free
tACC

ICC mA

Active
Standby Ordering Code

AT29LV020-10JU

AT29LV020-10TU

AT29LV020-20JU

AT29LV020-20TU

Package
32J 32T
32J 32T

AT29LV020

Operation Range Industrial
-40 to 85C

Package Type
32-lead, Plastic J-leaded Chip Carrier PLCC
32-lead, Thin Small Outline Package TSOP

Packaging Information
32J PLCC

PIN NO. 1 IDENTIFIER
e D1 D

B1 E2

A2 A1 A
0.51 0.020 MAX 45 MAX 3X

COMMON DIMENSIONS Unit of Measure = mm

This package conforms to JEDEC reference MS-016, Variation AE. Dimensions D1 and E1 do not include mold protrusion.

Allowable protrusion is 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. Lead coplanarity is mm maximum.

SYMBOL MIN NOM MAX NOTE

Note 2

Note 2
10/04/01

TITLE 2325 Orchard Parkway 32J, 32-lead, Plastic J-leaded Chip Carrier PLCC R San Jose, CA 95131
14 AT29LV020
32T TSOP

PIN 1

AT29LV020
0º ~ 8º c

Pin 1 Identifier

SEATING PLANE

GAGE PLANE

This package conforms to JEDEC reference MO-142, Variation BD. Dimensions D1 and E do not include mold protrusion. Allowable
protrusion on E is mm per side and on D1 is mm per side. Lead coplanarity is mm maximum.

COMMON DIMENSIONS Unit of Measure = mm

SYMBOL A A1 A2 D D1 E L L1 b c e
More datasheets: KT11B1JM | KT11B0SAM33 | KT11B0SAM35LFG | KT11P3SA1M35LFG | KT11B2SAM33 | KT11B1SAM33 | AT29LV020-10TU-T | AT29LV020-10JU-T | AT29LV020-10JU | AT29LV020-10TU


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Datasheet ID: AT29LV020-20TU 519003