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SAA7385 Datasheet(PDF) 55 Page - NXP Semiconductors

Part No. SAA7385
Description  Error correction and host interface IC for CD-ROM SEQUOIA
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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SAA7385 Datasheet(HTML) 55 Page - NXP Semiconductors

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1996 Jun 19
55
Philips Semiconductors
Preliminary specification
Error correction and host interface IC for
CD-ROM (SEQUOIA)
SAA7385
15.8
DRAM interface (the SAA7385 is designed to operate with standard 70 ns DRAMs)
VDD = 4.75 to 5.25 V; VSS =0V; Tamb = −10 to +70 °C; unless otherwise specified.
SYMBOL
PARAMETER
MIN.
MAX.
UNIT
DRAM interface timing; see Figs 24 to 28
tacc;CA
access time from column address
35
ns
thCA;RAS
column address hold time from RAS
55
ns
tsu;CA
column address set-up time
0
ns
tsu;RA
row address set-up time
0
ns
tacc;CAS
access time from CAS
20
ns
th;CA
column address hold time
15
ns
tW;CAS
CAS pulse width
20
10000
ns
th;CAS
CAS hold time (CBR refresh)
15
ns
tCASLZ
CAS to output in low impedance
3
ns
tpCAS
CAS precharge time
10
ns
tacc;pCAS
access time from CAS precharge
40
ns
tpCAS;RAS
CAS to RAS precharge time
5
ns
th;CAS
CAS hold time
70
ns
tsu;CAS
CAS set-up time (CBR refresh)
5
ns
twCASL
write command to CAS lead time
20
ns
th;DAT
data input hold time
15
ns
thDAT;RAS
data input hold time from RAS
55
ns
tsu;DAT
data input set-up time
0
ns
td;OFF
output buffer turn off delay
3
20
ns
tcy;FPR/W
fast page mode read or write cycle time
40
ns
tcy;FPR-W
fast page mode read-write cycle time
note 1
ns
tacc;RAS
access time from RAS
70
ns
tdRAS;CA
RAS to column address delay time
15
35
ns
th;RA
row address hold time
10
ns
tW;RAS
RAS pulse width
70
10000
ns
tW;RASFP
RAS pulse width (fast page mode)
70
100000
ns
tCA;RASL
column address to RAS lead time
35
ns
tcy;R/W
random read or write cycle time
130
ns
tdRAS;CAS
RAS to CAS delay time
20
50
ns
tsu;R
read command set-up time
0
ns
thrR;CAS
read command hold time (referenced to CAS)
0
ns
tREF
refresh period
32
ns
tpRAS
RAS precharge time
50
ns
tpRAS;CAS
RAS to CAS precharge time
0
ns
thr;RAS
read command hold time (referenced to RAS)
0
ns
th;RAS
RAS hold time
20
ns
tcy;R-W
read-write cycle time
n/a(1)
ns


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