SST39VF800A-70-4I-MAQE-T Microchip Technology, SST39VF800A-70-4I-MAQE-T Datasheet - Page 6

• Manufacturer Part Number: SST39VF800A-70-4I-MAQE-T
• Description: 2.7V To 3.6V 8Mbit Multi-Purpose Flash 48 WFBGA 4x6x0.8 Mm T/R
• Manufacturer: Microchip Technology
• Series: -r

Specifications of SST39VF800A-70-4I-MAQE-T

• Format - Memory: FLASH
• Memory Type: FLASH
• Memory Size: 8M (512K x 16)
• Speed: 70ns
• Interface: Parallel
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-WFBGA
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Application Note
•
•
•
In addition to the above differences, ST Micro also has a
command called Erase-Suspend/Resume on both the
M29F010 and the M29F002. This is needed because the
ST Micro M29F/Wxxx devices take several seconds to
erase the sector and therefore need the capability to inter-
rupt and suspend erase operations to perform Read opera-
tion. On the other hand, SST only takes few milliseconds to
perform an Erase operation, and therefore does not require
this command. For this reason, the Erase-Suspend/
Resume command is not supported and will be ignored by
SST 39 series devices.
Note that although the above notes describe the difference
between 5V flash from ST Micro and SST, identical com-
parisons are valid for describing the 3V flash from ST Micro
©2005 Silicon Storage Technology, Inc.
not erased. An alternative is to erase the entire chip,
and
corresponding to the ST Micro boot-block.
The M29F010 is based on uniform sector architecture
of 16 KByte each, as opposed to 4 KByte in the
SST39SF010A. So the SST39SF010A device has 32
sectors vs. 8 sectors for the M29F010 device. There-
fore, when a Sector-Erase operation is performed, the
SST39SF010A device will use address lines A
to decode sector address as opposed to A
the M29F010 device. These differences in sector
address decoding should be accounted for by the soft-
ware drivers.
The M29F002 has one 16 KByte, two 8 KByte, one 32
KByte and three 64 KByte sectors. By contrast, the
SST39SF020A has sectors of uniform sector size of 4
KByte. So the SST39SF020A device has 64 sectors
vs. 7 sectors for the M29F002 device. This difference
in sector size results in the SST39SF020A device hav-
ing more sectors (sixty-four on SST39SF020A vs.
seven on M29F002). Consequently, when a Sector-
Erase operation is performed, the SST39SF020A
device will use address lines A
address as opposed to A
device. These differences in sector address decoding
should be accounted for by the software drivers.
The M29F040 is based on uniform sector architecture
of 64 KByte each, as opposed to 4 KByte in the
SST39SF040. This difference in sector size results in
the SST39SF040 device having more sectors (One
hundred and twenty-eight on SST39SF040 vs. eight
on M29F040). Therefore, when a Sector-Erase opera-
tion is performed, the SST39SF040 device will use
address lines A
opposed to A
differences in sector address decoding should be
accounted for by the software drivers.
then
re-program
18
-A
18
-A
14
12
on the M29F040 device. These
to decode sector address as
the
17
-A
17
-A
13
two
12
on the M29F002
to decode sector
SST
Multi-Purpose Flash (39 Series) Byte-wide Products
16
-A
sectors
16
14
-A
on
12
6
and SST. Consequently, the SST’s 39 series flash can be
used to substitute ST Micro equivalents with minimal
design changes.
Comparisons with the ST Micro
M29W017D
For 16M, ST Microelectronics offers the M29W017D. This
device reads, programs, and erases with a single 2.7-3.6V
power supply voltage.
Hardware Comparisons
The SST39VF016 and ST Micro’s M29W017D are offered
in JEDEC standard 10mm x 20mm 40-lead TSOP pack-
ages and have the same pin assignments for basic func-
tions. SST also offers this product in a BGA package with
the same ball assignments as ST Micro. The only differ-
ences in pin assignments between these two products are
on pins 10 and 12, as described in the following table.
TABLE 8: P
The M29W017D has a hardware reset function (RESET#)
on pin 12 whereas the SST39VF016 has a no-connect on
this pin. The purpose of RESET# is to terminate any opera-
tion in progress and reset the internal state machine to
read array data. The only difference is that in SST’s case,
an Erase or Program operation is allowed to complete,
whereas in the case of the competitor, such an operation is
interrupted by the RESET# command. The system would
have to wait for SST’s operation to complete before it can
read. Since SST has faster Erase and Program times, wait-
ing is not an issue.
The Ready/Busy pin (RY/BY#) on the ST Microelectronics
device provides an additional hardware method of detect-
ing completion of a Program or Erase cycle. In the case of
ST Microelectronics, the RY/BY# pin is necessary because
ST Microelectronics has an internal state machine that var-
ies the length of the Write pulse width. SST, on the other
hand, uses a fixed pulse width to program and erase its
devices. As a result, SST does not require a RY/BY# pin
and does not offer it.
In summary, an SST39VF016 can be used on an existing
M29W017D-based design without any board layout
changes when used in x16 mode.
Pin 12
Pin 15
1. No connect
IN
SST
NC
NC
D
IFFERENCES
1
Designing In SST’s
ST MICRO
RESET#
RY/BY#
S72014-04-000
T8.0 2014
10/05