SST39VF400A-70-4I-MAQE-T Microchip Technology, SST39VF400A-70-4I-MAQE-T Datasheet - Page 3

• Manufacturer Part Number: SST39VF400A-70-4I-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-70-4I-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: -40°C ~ 85°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
The primary difference is Sector-Erase operation which is
described here: the Sector-Erase operation for both SST39
and AMD devices use the same six-byte command
sequence with the same command data of 30H, but differ-
ent sector addresses during that byte-sequence. This is
due to the difference in sector sizes of the SST and AMD.
Also note that for the SDP command cycles, AMD only
specifies a subset of the standard JEDEC command
address bits e.g. AMD uses x555H, whereas SST uses
5555H.
•
•
•
In addition to the above differences, AMD also has a com-
mand called Erase-Suspend/Resume on both the
Am29F010 and the Am29F002/002N. This is needed
because the AM29F/LVxxx devices take several seconds
to erase the sector and therefore need the capability to
interrupt and suspend erase operations to perform Read
operation. On the other hand, SST only takes few millisec-
onds to perform an Erase operation, and therefore does
not require this command. For this reason, the Erase-Sus-
pend/Resume command is not supported and will be
ignored by SST 39 series devices.
©2005 Silicon Storage Technology, Inc.
The Am29F010 is based on uniform sector architec-
ture of 16 KByte each, as opposed to 4 KByte in the
SST39SF010A. So the SST39SF010A device has 32
sectors vs. 8 sectors for the Am29F010 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 Am29F010 device. These differences in sector
address decoding should be accounted for by the soft-
ware drivers.
The Am29F002/002N 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 sec-
tors vs. 8 sectors for the Am29F002/002N device.
Consequently, when a Sector-Erase operation is per-
formed, the SST39SF020A device will use address
lines A
A
ences in sector address decoding should be
accounted for by the software drivers.
The Am29F040 is based on uniform sector architec-
ture of 64 KByte each, as opposed to 4 KByte in the
SST39SF040. So the SST39SF040 device has 128
sectors vs. 8 sectors for the Am29F040 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 Am29F040 device. These differences in sector
address decoding should be accounted for by the soft-
ware drivers.
17
-A
13
17
on the Am29F002/002N device. These differ-
-A
12
to decode sector address as opposed to
16
18
-A
-A
16
18
14
14
-A
-A
on
on
12
12
3
Comparisons with the AMD Am29LV017D
For 16M, AMD offers the Am29LV017D. This device reads,
programs, and erases with a single 2.7-3.6V power supply
voltage.
Hardware Comparisons
The SST39VF016 and Am29LV017D devices 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 AMD. The only differences in
pin assignments between these two products are on pins
10 and 12, as described in the table below.
TABLE 4: P
The Am29LV017D has a hardware reset function
(RESET#) whereas the SST39VF016 has a no-connect on
pin 10. The purpose of the RESET# is to terminate any
operation 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 AMD, such an operation is inter-
rupted by the RESET# command. The system would have
to wait for SST’s operation to complete before it can read.
However, it is important to note that while AMD has a Sec-
tor-Erase time of 15s, SST erases an equivalent block in 25
ms. For Byte-Programming, AMD specifies a maximum of
300 µs, whereas SST specifies 20 µs. As a result, the
absence of a RESET# pin is typically not an issue.
The Ready/Busy pin (RY/BY#) on the AMD device pro-
vides an additional hardware method of detecting comple-
tion of Program or Erase cycles. In the case of AMD, the
RY/BY# pin is necessary because AMD has an internal
state machine that varies the length of the Write pulse
width. SST, on the other hand, is able to use a fixed pulse
width to program and erase its devices since SST's flash
cell architecture enables more stable device characteristics
over the product lifetime. As a result, SST does not require
a RY/BY# pin and does not offer it.
The above table describes the differences in the TSOP pin
assignments; note that the same functional differences
exist between the BGA packages of this product.
Pin 10
Pin 12
1. No connect
SST
NC
NC
IN
1
D
IFFERENCES
AMD
RESET#
RY/BY#
S72014-04-000
Application Note
T4.0 2014
10/05