AT49F040A-55JU Atmel, AT49F040A-55JU Datasheet - Page 3

• Manufacturer Part Number: AT49F040A-55JU
• Description: IC FLASH 4MBIT 55NS 32PLCC
• Manufacturer: Atmel

Specifications of AT49F040A-55JU

• Format - Memory: FLASH
• Memory Type: FLASH
• Memory Size: 4M (512K x 8)
• Speed: 55ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-PLCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3. Block Diagram
4. Device Operation
4.1
3359D–FLASH–3/05
Read
The AT49F040A 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.
ADDRESS
INPUTS
RESET
GND
VCC
WE
OE
CE
Y DECODER
X DECODER
CONTROL
LOGIC
DATA INPUTS/OUTPUTS
DATA LATCHES
INPUT/OUTPUT
MAIN MEMORY
MAIN MEMORY
MAIN MEMORY
MAIN MEMORY
MAIN MEMORY
MAIN MEMORY
MAIN MEMORY
MAIN MEMORY
BOOT BLOCK
PARAMETER
PARAMETER
(64K BYTES)
(64K BYTES)
(64K BYTES)
(64K BYTES)
(64K BYTES)
(64K BYTES)
(64K BYTES)
(32K BYTES)
(16K BYTES)
(8K BYTES)
(8K BYTES)
AT49F040A
PROGRAM
Y-GATING
I/O7 - I/O0
BUFFERS
BLOCK 8
BLOCK 7
BLOCK 6
BLOCK 5
BLOCK 4
BLOCK 3
BLOCK 2
BLOCK 1
BLOCK 2
BLOCK 1
8
AT49F040A
7FFFF
70000
6FFFF
60000
5FFFF
50000
4FFFF
40000
3FFFF
30000
2FFFF
20000
1FFFF
10000
0FFFF
08000
07FFF
06000
05FFF
04000
03FFF
00000
3