SST39VF400A-70-4C-MAQE-T Microchip Technology, SST39VF400A-70-4C-MAQE-T Datasheet - Page 7

• Manufacturer Part Number: SST39VF400A-70-4C-MAQE-T
• Description: 2.7V To 3.6V 4Mbit Multi-Purpose Flash 48 WFBGA 4x6x0.8 Mm T/R
• Manufacturer: Microchip Technology
• Series: -r

Specifications of SST39VF400A-70-4C-MAQE-T

• Format - Memory: FLASH
• Memory Type: FLASH
• Memory Size: 4M (256K x 16)
• Speed: 70ns
• Interface: Parallel
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 48-WFBGA
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Designing In SST’s
Multi-Purpose Flash (39 Series) Byte-wide Products
Software Comparisons
The SST39VF016 uses the standard JEDEC command
set for x16 single-power-supply flash memory while the
M29W017D only uses JEDEC-compatible command sets.
The command sequences for basic device operations
between the two products are identical except that ST
Micro does not specify any of the standard JEDEC com-
mand address e.g. ST Micro uses xxxxH, whereas SST
uses 5555H. For more details, please refer to the data
sheet of each product.
TABLE 9: C
The Sector-Erase operations of SST and ST Microelec-
tronics devices use the same six-byte command sequence
with the same command data of 30H, but different sector
addresses during their sixth byte sequence. This is due to
the differences in sector architectures between SST and
ST Microelectronics products. The M29W017D consists of
one 8 KWord, two 4 KWord, one 16 KWord, and thirty-one
64 KByte sectors. On the other hand, the SST39VF016
consists of 512 uniform 4 KByte sectors. This difference in
sector architectures results in the SST device having more
sectors than the ST Microelectronics device. Therefore,
when a Sector-Erase operation is performed, the SST
device will use address lines A
addresses as opposed to the ST Microelectronics device
using A
ing should be accounted for by the software driver.
In addition to the Sector-Erase command which erases
uniform small sectors, the SST39VF016 offers a Block-
Erase command. While the Sector-Erase operation erases
4 KByte sectors on the SST device, a Block-Erase opera-
tion erases 64 KByte blocks. Each block consists of sixteen
4 KByte sectors. This flexible sector/block erasability allows
a system designer to use the Sector-Erase capability for
finer software granularity and the Block-Erase capability for
faster Erase operations. Note that the ST Microelectronics
device erases 64 KByte sectors using a Sector-Erase
command (30H), while the SST device erases 64 KByte
blocks using a Block-Erase command (50H).
©2005 Silicon Storage Technology, Inc.
Word-Program
Sector-Erase
Block-Erase
Chip-Erase
ID Entry
ID Exit
19
-A
12.
These differences in sector address decod-
OMMAND
SST
4 Cycle with A0H
6 Cycle with 30H
6 Cycle with 50H
6 Cycle with 10H
3 Cycle with 90H
1 or 3 Cycle with F0H
S
ET
C
OMPARISON
19
-A
11
to decode sector
ST MICRO
Same
Same
N/A
Same
Same
Same
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7
In summary, when an SST39VF016 is used on an exist-
ing M29W017D-based design, minor modifications to the
software driver are required.
For 8M flash products, the same analogies apply: the only
difference is that A
Micro’s part is the M29W008A, whereas SST’s part is the
SST39VF080. For 8M, ST Micro did offer the BGA pack-
age, but discontinued it later. SST has, however, intro-
duced the SST39VF080 as a low density migration from
16M. Note that the same differences described above
apply when comparing the ST Micro 8M with the SST 8M
products.
SST AND ATMEL
Comparisons with the Atmel AT49F series
In the AT49F series, Atmel offers the following 4M, 2M, 1M,
and 512K devices - the AT49F040, AT49F020, AT49F010,
and AT49F512 (in that order). SST’s equivalent offerings
are the SST39SF040, SST39SF020A, SST39SF010A,
and SST39SF512.
TABLE 10: V
Hardware Comparisons
The AT49F512, AT49F010, AT49F020, and AT49F040 are
all are offered in 32-pin PLCC, PDIP , and TSOP packages.
In the PLCC and PDIP packages, an SST 39 series is
fully pin compatible with an Atmel AT49F device of the
same density. As a result, the SST 39 series device can
be used in an Atmel design without any modifications in
board layout.
For TSOPs, Atmel offers both 8mm x 20mm and 8mm x
14mm packages. For an 8mm x 14mm package, SST 39
series devices are fully pin compatible with Atmel’s 8mm x
14mm TSOP device of the same density, and can therefore
substitute it without any board layout modifications. A sys-
tem design which currently uses Atmel’s 8mm x 20mm
package can use SST’s 8mm x 14mm package if a longer
trace is used.
5V
3V
ATMEL
49F
49LV
OLTAGE
19
is the most significant address. ST
C
OMPARISONS
SST
SST39SF
SST39VF
S72014-04-000
Application Note
T10.0 2014
10/05