DP8419N-70 National Semiconductor, DP8419N-70 Datasheet - Page 23

• Manufacturer Part Number: DP8419N-70
• Description: IC CTRLR 256K DRAM 48-DIP
• Manufacturer: National Semiconductor

Specifications of DP8419N-70

• Controller Type: Dynamic RAM (DRAM) Controller, Drivers
• Voltage - Supply: 4.5 V ~ 5.5 V
• Current - Supply: 150mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 48-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Interface: -
• Other names: *DP8419N-70

REFRESH (Continued)
t
t
t
t
t
t
t
t
t
t
t
T
t
t
t
t
t
t
Switching Characteristics DP8417 DP8418 DP8419 DP8419X
V
of 22 DRAMs each or 88 DRAMs including trace capacitance
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
RFPDL5
RFPDH0
RFPDH5
RFLCT
RFLRL
RFHRL
RFHRV
ROHNC
RST
CTL
RFCKL H
RGCKL
RGCKH
FRQL
FRQH
RGRL
RGRH
CC
These values are Q0-Q8 C
e
5 0V
g
RASIN to RAS Low Delay
during Hidden Refresh
RASIN to RAS High Delay
during Refresh (Mode 0)
RASIN to RAS High Delay
during Hidden Refresh
RFSH Low to Counter
Address Valid
RFSH Low Set-up to RASIN
Low (Mode 0) to get
Minimum t
RFSH High Setup to Access
RASIN Low
RFSH High to Row
Address Valid
RAS High to New Count
Valid
Counter Reset Pulse Width
RFI O Low to Counter
Outputs All Low
Minimum Pulse Width
of RFCK
Period of RAS Generator
Clock
Minimum Pulse Width Low
of RGCK
Minimum Pulse Width High
of RGCK
RFCK Low to Forced RFRQ
(RFI O) Low
RGCK Low to Forced RFRQ
High
RGCK Low to RAS Low
RGCK Low to RAS High
10% 0 C
Parameter
ASR
s
T
A s
e
L
0
e
70 C unless otherwise noted (Notes 2 4 5) The output load capacitance is typical for 4 banks
500 pF RAS0– RAS3 C
Figure 7
Figure 2a
Figure 7
Figures 2a 3
Figure 2a
Figure 3
Figure 3
Figure 2a
Figure 2a
Figure 2a
Figure 7
Figure 3
Figure 3
Figure 3
Figure 3
Figure 3
Figure 3
Figure 3
CS
C
RL
C
RL
Condition
L
L
e
e
e
e
e
50 pF
50 pF
35k
35k
X
L
23
e
150 pF WE C
Min
100
12
25
60
30
15
15
20
20
CL
Max
100
38
35
44
38
43
42
66
55
41
48
L
e
500 pF CAS C
Min
All C
L
e
L
e
50 pF
(Continued)
600 pF RL
Max
e
500
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns