SAA7385 Datasheet, PDF (55/64 Pages) NXP Semiconductors – Error correction and host interface IC for CD-ROM SEQUOIA

Philips Semiconductors
Error correction and host interface IC for
CD-ROM (SEQUOIA)
Preliminary specification
SAA7385
15.8 DRAM interface (the SAA7385 is designed to operate with standard 70 ns DRAMs)
V_DD = 4.75 to 5.25 V; V_SS = 0 V; T_amb = −10 to +70 °C; unless otherwise specified.
SYMBOL
PARAMETER
MIN.
MAX.
DRAM interface timing; see Figs 24 to 28
t_acc;CA
t_hCA;RAS
t_su;CA
t_su;RA
t_acc;CAS
t_h;CA
t_W;CAS
t_h;CAS
t_CASLZ
t_pCAS
t_acc;pCAS
t_pCAS;RAS
t_h;CAS
t_su;CAS
t_wCASL
t_h;DAT
t_hDAT;RAS
t_su;DAT
t_d;OFF
t_cy;FPR/W
t_cy;FPR-W
t_acc;RAS
t_dRAS;CA
t_h;RA
t_W;RAS
t_W;RASFP
t_CA;RASL
t_cy;R/W
t_dRAS;CAS
t_su;R
t_hrR;CAS
t_REF
t_pRAS
t_pRAS;CAS
t_hr;RAS
t_h;RAS
t_cy;R-W
access time from column address
column address hold time from RAS
column address set-up time
row address set-up time
access time from CAS
column address hold time
CAS pulse width
CAS hold time (CBR refresh)
CAS to output in low impedance
CAS precharge time
access time from CAS precharge
CAS to RAS precharge time
CAS hold time
CAS set-up time (CBR refresh)
write command to CAS lead time
data input hold time
data input hold time from RAS
data input set-up time
output buffer turn off delay
fast page mode read or write cycle time
fast page mode read-write cycle time
access time from RAS
RAS to column address delay time
row address hold time
RAS pulse width
RAS pulse width (fast page mode)
column address to RAS lead time
random read or write cycle time
RAS to CAS delay time
read command set-up time
read command hold time (referenced to CAS)
refresh period
RAS precharge time
RAS to CAS precharge time
read command hold time (referenced to RAS)
RAS hold time
read-write cycle time
−
55
0
0
−
15
20
15
3
10
−
5
70
5
20
15
55
0
3
40
note 1
−
15
10
70
70
35
130
20
0
0
−
50
0
0
20
n/a⁽¹⁾
35
−
−
−
20
−
10 000
−
−
−
40
−
−
−
−
−
−
−
20
−
−
70
35
−
10 000
100 000
−
−
50
−
−
32
−
−
−
−
−
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
1996 Jun 19
55