IS42S32400B-7T ISSI, Integrated Silicon Solution Inc, IS42S32400B-7T Datasheet - Page 26
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IS42S32400B-7T
Manufacturer Part Number
IS42S32400B-7T
Description
IC SDRAM 128MBIT 143MHZ 86TSOP
Manufacturer
ISSI, Integrated Silicon Solution Inc
Type
SDRAMr
Datasheet
1.IS42S32400B-7T-TR.pdf
(60 pages)
Specifications of IS42S32400B-7T
Format - Memory
RAM
Memory Type
SDRAM
Memory Size
128M (4Mx32)
Speed
143MHz
Interface
Parallel
Voltage - Supply
3 V ~ 3.6 V
Operating Temperature
0°C ~ 70°C
Package / Case
86-TSOPII
Organization
4Mx32
Density
128Mb
Address Bus
14b
Access Time (max)
6.5/5.4ns
Maximum Clock Rate
143MHz
Operating Supply Voltage (typ)
3.3V
Package Type
TSOP-II
Operating Temp Range
0C to 70C
Operating Supply Voltage (max)
3.6V
Operating Supply Voltage (min)
3V
Supply Current
130mA
Pin Count
86
Mounting
Surface Mount
Operating Temperature Classification
Commercial
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
IS42S32400B-7T
Manufacturer:
ISSI
Quantity:
1 653
Company:
Part Number:
IS42S32400B-7TL
Manufacturer:
ISSI
Quantity:
7 760
Company:
Part Number:
IS42S32400B-7TL
Manufacturer:
ISSI
Quantity:
10
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Manufacturer:
ISSI
Quantity:
20 000
Company:
Part Number:
IS42S32400B-7TLI
Manufacturer:
ISSI
Quantity:
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Company:
Part Number:
IS42S32400B-7TLI
Manufacturer:
ISSI
Quantity:
1 080
Part Number:
IS42S32400B-7TLI
Manufacturer:
ISSI
Quantity:
20 000
IS42S32400B
CHIP OPERATION
BANK/ROW ACTIVATION
Before any READ or WRITE commands can be issued to a
bank within the SDRAM, a row in that bank must be “opened.”
This is accomplished via the ACTIVE command, which
selects both the bank and the row to be activated (see
Activating Specific Row Within Specific Bank).
After opening a row (issuing an ACTIVE command), a
READ or WRITE command may be issued to that row,
subject to the t
divided by the clock period and rounded up to the next whole
number to determine the earliest clock edge after the
ACTIVE command on which a READ or WRITE command
can be entered. For example, a t
with a 125 MHz clock (8ns period) results in 2.25 clocks,
rounded to 3. This is reflected in the following example,
which covers any case where 2 < [t
same procedure is used to convert other specification limits
from time units to clock cycles).
A subsequent ACTIVE command to a different row in the
same bank can only be issued after the previous active row
has been “closed” (precharged). The minimum time interval
between successive ACTIVE commands to the same bank
is defined by t
A subsequent ACTIVE command to another bank can be
issued while the first bank is being accessed, which results
in a reduction of total row-access overhead. The minimum
time interval between successive ACTIVE commands to
different banks is defined by t
EXAMPLE: MEETING TRCD (MIN) WHEN 2 < < < < < [TRCD (MIN)/TCK] ≤ ≤ ≤ ≤ ≤ 3
26
RC
RCD
.
specification. Minimum t
COMMAND
RRD
CLK
RCD
.
RCD
specification of 18ns
(MIN)/t
ACTIVE
T0
RCD
CK
should be
] ≤ 3. (The
Integrated Silicon Solution, Inc. — www.issi.com —
t
NOP
RCD
T1
ACTIVATING SPECIFIC ROW WITHIN SPE-
CIFIC BANK
BA0, BA1
A0-A11
NOP
T2
CKE
RAS
CAS
CLK
WE
CS
HIGH
READ or
WRITE
T3
DON'T CARE
BANK ADDRESS
ROW ADDRESS
PRELIMINARY INFORMATION Rev. 00J
T4
1-800-379-4774
03/03/09