IS42S32200E-7B-TR ISSI, Integrated Silicon Solution Inc, IS42S32200E-7B-TR Datasheet - Page 29
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IS42S32200E-7B-TR
Manufacturer Part Number
IS42S32200E-7B-TR
Description
IC SDRAM 64MBIT 143MHZ 90BGA
Manufacturer
ISSI, Integrated Silicon Solution Inc
Type
SDRAMr
Specifications of IS42S32200E-7B-TR
Format - Memory
RAM
Memory Type
SDRAM
Memory Size
64M (2Mx32)
Speed
143MHz
Interface
Parallel
Voltage - Supply
3.15 V ~ 3.45 V
Operating Temperature
0°C ~ 70°C
Package / Case
90-BGA
Organization
2Mx32
Density
64Mb
Address Bus
13b
Access Time (max)
8/5.5ns
Maximum Clock Rate
143MHz
Operating Supply Voltage (typ)
3.3V
Package Type
TFBGA
Operating Temp Range
0C to 70C
Operating Supply Voltage (max)
3.6V
Operating Supply Voltage (min)
3V
Supply Current
140mA
Pin Count
90
Mounting
Surface Mount
Operating Temperature Classification
Commercial
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
IS42S32200E, IS45S32200E
POWER-DOWN
Integrated Silicon Solution, Inc. — www.issi.com
Rev. D
07/12/2010
POWER-DOWN
Power-down occurs if CKE is registered LOW coincident
with a NOP or COMMAND INHIBIT when no accesses
are in progress. If power-down occurs when all banks are
idle, this mode is referred to as precharge power-down;
if power-down occurs when there is a row active in either
bank, this mode is referred to as active power-down.
Entering power-down deactivates the input and output
buffers, excluding CKE, for maximum power savings while
in standby. The device may not remain in the power-down
state longer than the refresh period (t
operations are performed in this mode.
The power-down state is exited by registering a NOP or
COMMAND INHIBIT and CKE HIGH at the desired clock
edge (meeting t
PRECHARGE
The PRECHARGE command (see figure) is used to deac-
tivate the open row in a particular bank or the open row in
all banks.The bank(s) will be available for a subsequent row
command is issued. Input A10 determines whether one or
all banks are to be precharged, and in the case where only
one bank is to be precharged, inputs BA0, BA1 select the
bank. When all banks are to be precharged, inputs BA0,
BA1 are treated as “Don’t Care.” Once a bank has been
precharged, it is in the idle state and must be activated
prior to any READ or WRITE commands being issued to
that bank.
access some specified time (t
cks
COMMAND
). See figure below.
CKE
CLK
All banks idle
Enter power-down mode
rp
) after the PRECHARGE
ref
t
NOP
CKS
) since no refresh
Input buffers gated off
PRECHARGE Command
Exit power-down mode
BA0, BA1
A0-A9
CKE
RAS
CAS
CLK
A10
WE
CS
≥ t
HIGH
CKS
NOP
DON'T CARE
BANK ADDRESS
BANK SELECT
ACTIVE
ALL BANKS
t
t
t
RCD
RAS
RC
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