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DP8418 Datasheet(PDF) 24 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # DP8418
Description  64k, 256k Dynamic RAM Controller/Drivers
PDF  28 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP8418 Datasheet(HTML) 24 Page - National Semiconductor (TI)

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Switching Characteristics DP8417 DP8418 DP8419 DP8419X (Continued)
VCC e 50V g10% 0 C s TA s 70 C unless otherwise noted (Notes 2 4 5) The output load capacitance is typical for 4 banks
of 22 DRAMs each or 88 DRAMs including trace capacitance
These values are Q0-Q8 CL e 500 pF RAS0–RAS3 CL e 150 pF WE CL e 500 pF CAS CL e 600 pF RL e 500X
unless otherwise noted See
Figure 11a for test load S1 is open unless otherwise specified Maximum propagation
delays are specified with all outputs switching
Symbol
Parameter
Condition
CL
All CL e 50 pF
Units
Min
Max
Min
Max
REFRESH
(Continued)
tRQHRF
RFSH Hold Time from RGCK
Figure 3
2T
ns
tRFRH
RFSH High to RAS High
(See Mode 1
(Ending Forced Refresh
Description)
42
ns
early)
tRFSRG
RFSH Low Set-up to
(See Mode 1
RGCK Low (Mode 1)
Description)
12
ns
Figure 3
tCSHR
CS High to RASIN Low for
Figure 7
10
ns
Hidden Refresh
tRKRL
RFCK High to RASIN
50
ns
low for hidden Refresh
DP8419 DP8419X ONLY
tCSRL1
CS Low to Access RASIN
Figure 3
Low (Using Mode 5 with
34
ns
Auto Refresh Mode)
tCSRL0
CS Low to Access RASIN
(See Mode 5
Low (Using Modes 4 or 5
Description)
5ns
with externally controlled
Refresh)
DP8418 ONLY
tCSRL1
CS Low to Access RASIN
Figure 3
Low (Using Mode 5 with
5
ns
Auto Refresh Mode)
tCSRL0
CS Low to Access RASIN
(See Mode 5
Low (Using Modes 4 or 5
Description)
5ns
with externally controlled
Refresh)
DP8417 ONLY
PRELIMINARY
tCSRL1
CS Low to Access RASIN
Figure 3
Low (Using Mode 5 with
34
ns
Auto Refresh Mode)
tCSRL0
CS Low to Access RASIN
(See Mode 5
Low (Using Modes 4 or 5
Description)
34
ns
with externally controlled
Refresh)
TRI-STATE (DP8417 ONLY)
tZH
CS Low to Output
S1 Open
50
ns
High from Hi-Z
Figure 11b
tHZ
CS High to Output
S1 Open Q WE
50
ns
Hi-Z from High
Figure 11b
tHZ
CS High to Output
S1 Open RAS0-3
Hi-Z from High
CAS0-3
95
ns
Figure 11b
tZL
CS Low to Output
S1 Closed
50
ns
Low from Hi-Z
Figure 11b
tLZ
CS High to Output
S1 Closed
50
ns
Hi-Z from Low
Figure 11b
24



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