IS43LD16640C datasheet(47/142 Pages) ISSI

47 / 142 page

IS43/46LD16640C

IS43/46LD32320C

Integrated Silicon Solution, Inc. — www.issi.com

Rev. C

07/02/2021

® Long-term Support

World Class Quality

PRECHARGE

The PRECHARGE command is used to precharge or close a bank that has been activated.

The PRECHARGE command is initiated with CS# LOW, CA0 HIGH, CA1 HIGH, CA2 LOW, and

CA3 HIGH at the rising edge of the clock. The PRECHARGE command can be used to precharge

each bank independently or all banks simultaneously.

This is an 8-bank device, such that the AB flag and the bank address bits BA0, BA1, and BA2 are

used to determine which bank(s) to precharge. The precharged bank(s) will be available for sub-

sequent row access tRPab after an all bank PRECHARGE command is issued, or tRPpb after a

single-bank PRECHARGE command is issued.

In order to ensure that 8-bank devices can meet the instantaneous current demand required to

operate, the row precharge time (tRP) for an all bank PRECHARGE in 8-bank devices (tRPab) will

be longer than the row precharge time for a single-bank PRECHARGE (tRPpb).

Bank Selection for PRECHARGE by Address Bits

AB (CA4r)

BA2 (CA9r)BA1 (CA8r)BA0 (CA7r) Precharged Bank(s)

8-bank device

0000

Bank 0 only

0001

Bank 1 only

0010

Bank 2 only

0011

Bank 3 only

0100

Bank 4 only

0101

Bank 5 only

0110

Bank 6 only

0111

Bank 7 only

Don't care

All Banks

Bank selection for Precharge by address bits

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