IS43R32400D-5BL ISSI, Integrated Silicon Solution Inc, IS43R32400D-5BL Datasheet - Page 35

• Manufacturer Part Number: IS43R32400D-5BL
• Manufacturer: ISSI, Integrated Silicon Solution Inc
• Type: DDR SDRAMr

Specifications of IS43R32400D-5BL

• Organization: 4Mx32
• Density: 128Mb
• Address Bus: 14b
• Access Time (max): 700ps
• Maximum Clock Rate: 200MHz
• Operating Supply Voltage (typ): 2.6V
• Operating Temp Range: 0C to 70C
• Operating Supply Voltage (max): 2.7V
• Operating Supply Voltage (min): 2.5V
• Supply Current: 185mA
• Pin Count: 144
• Mounting: Surface Mount
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Compliant

IS43R32400D, IS43R16800D
ACTIVE
Before any READ or WRITE commands can be issued to a bank in the DDR SDRAM, a row in that bank must be
opened. This is accomplished by the ACTIVE command: BA0 and BA1 select the bank, and the address inputs select
the row to be activated. More than one bank can be active at anytime.
Once a row is open, a READ or WRITE command could be issued to that row, subject to the tRCD specification.
A subsequent ACTIVE command to another row in the same bank can only be issued after the previous row has been
closed. The minimum time interval between two successive ACTIVE commands on the same bank is defined by tRC.
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 two successive ACTIVE commands
on different banks is defined by tRRD. Bank Activation Command Cycle shows the tRCD and tRRD definition.
The row remains active until a PRECHARGE command (or READ or WRITE command with Auto Precharge) is issued
to the bank.
A PRECHARGE command (or READ or WRITE command with Auto Precharge) must be issued before opening a
different row in the same bank.
Integrated Silicon Solution, Inc.
Rev. 00D
06/22/09
Note:
All Command and Timing diagrams are for x16 option with AP = A10. For x32 option AP = A8.
Bank Activation Command Cycle
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