IS42S32800B-7BL ISSI, Integrated Silicon Solution Inc, IS42S32800B-7BL Datasheet - Page 17

• Manufacturer Part Number: IS42S32800B-7BL
• Description: IC SDRAM 256MBIT 143MHZ 90BGA
• Manufacturer: ISSI, Integrated Silicon Solution Inc
• Type: SDRAMr

Specifications of IS42S32800B-7BL

• Package / Case: 90-BGA
• Memory Size: 256M (8Mx32)
• Format - Memory: RAM
• Memory Type: SDRAM
• Speed: 143MHz
• Interface: Parallel
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: 0°C ~ 70°C
• Data Bus Width: 32 bit
• Organization: 2 Mbit x 32
• Maximum Clock Frequency: 143 MHz
• Access Time: 7 ns
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 3 V
• Maximum Operating Current: 150 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Density: 256Mb
• Address Bus: 14b
• Access Time (max): 5.5ns
• Maximum Clock Rate: 143MHz
• Operating Supply Voltage (typ): 3.3V
• Package Type: BGA
• Operating Temp Range: 0C to 70C
• Operating Supply Voltage (max): 3.6V
• Operating Supply Voltage (min): 3V
• Supply Current: 150mA
• Pin Count: 90
• Mounting: Surface Mount
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 706-1024

IS42S32800B
Integrated Silicon Solution, Inc.
Rev. F
07/21/09
Column Address
•
The Burst Type can be one of two modes,Interleave Mode or Sequential Mode.
A3
0
1
—Addressing Sequence of Sequential Mode
•
A column access is started in the input column address and is performed by inverting the address
bits in the sequence shown in the following table.
•
This field specifies the number of clock cycles from the assertion of the Read command to the first
read data.The minimum whole value of CAS#Latency depends on the frequency of CLK.The
minimum whole value satisfying the following formula must be programmed into this field.
t
Data n
Data 0
Data 1
Data 2
Data 3
Data 4
Data 5
Data 6
Data 7
CAC
Burst Length
(min)<=CAS#Latency X t
A6
0
0
0
0
1
Data n
Burst Type Field (A3)
Burst Type
Sequential
Interleave
An internal column address is performed by increasing the address from the column address which is input to the
device.The internal column address is varied by the Burst Length as shown in the following table.When the value
of column address,(n +m),in the table is larger than 255,only the least significant 8 bits are effective.
Addressing Sequence of Interleave Mode
CAS#Latency Field (A6~A4)
A5
0
0
1
1
X
A7
A7
A7
A7
A7
A7
A7
A7
A4
0
1
0
1
X
Full Page: Column address is repeated until terminated.
0
n
A6
A6
A6
A6
A6
A6
A6
A6
2 words:
4 words:
8 words:
Reserved
Reserved
2 clocks
3 clocks
Reserved
n+1
CAS#Latency
1
A5
A5
A5
A5
A5
A5
CK
A5
A5
n+2
2
Column Address
A4
A4
A4
A4
A4
A4
A4
A4
n+3
3
n+4
4
A3
A3
A3
A3
A3
A3
A3
A3
n+5
5
A2
A2
A2
A2
A2#
A2#
A2#
A2#
n+6
6
A1
A1
A1#
A1#
A1
A1
A1#
A1#
n+7
7
A0
A0#
A0
A0#
A0
A0#
-
A0
A0#
-
n+255
255
4 words
256
n
Burst Length
257
n+1
8 words
-
-
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