8 ELECTRICAL CHARACTERISTICS

DRAM CAS-before-RAS refresh cycle

CBR refresh cycle

CCBR1

CCBR2

CCBR3

BCLK

 

 

 

tRASD1

tRASD2

#RAS

 

 

 

tCASD1

tCASD2

#HCAS/

#LCAS

#WE

DRAM self-refresh cycle

 

Self-refresh mode setup

 

Self-refresh mode

 

Self-refresh mode canceration

 

 

 

 

 

 

 

 

 

 

 

 

 

6-cycle precharge

 

 

 

 

 

 

(Fixed)

 

BCLK

 

tRASD1

tRASD2

#RAS

 

tCASD1

tCASD2

#HCAS/

 

#LCAS

 

Burst ROM read cycle

SRAM read cycleBurst cycleBurst cycleBurst cycle

BCLK

tAD

 

 

 

tAD

A[23:2]

 

 

 

 

tAD

tAD

tAD

tAD

tAD

A[1:0]

 

 

 

 

tCE1

 

 

 

tCE2

#CEx

 

 

 

 

tRDD1

 

 

 

tRDD2

#RD

 

 

 

 

tACC2

tACCB

tACCB

tACCB

 

tCEAC

 

 

 

 

tRDAC2

 

 

 

 

tRDS

tRDS

tRDS

 

tRDS

D[15:0]

 

 

 

1

 

tRDH

tRDH

tRDH

 

tRDH

1 tRDH is measured with respect to the first signal change (negation) from among the #RD, #CEx and A[23:0] signals.

S1C33210 PRODUCT PART

EPSON

A-83