DP8421AV-25 National Semiconductor, DP8421AV-25 Datasheet - Page 55

• Manufacturer Part Number: DP8421AV-25
• Description: IC CTRLR/DVR CMOS PROGRAM 68PLCC
• Manufacturer: National Semiconductor

Specifications of DP8421AV-25

• Controller Type: Dynamic RAM (DRAM)
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 68-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *DP8421AV-25

Number
450
451
452
453a
453b
453c
453d
454
455
13 0 AC Timing Parameters
Unless otherwise stated V
per bank including trace capacitance (Note 2)
Two different loads are specified
C
C
L
L
e
e
50 pF loads on all outputs except
150 pF loads on Q0–8 9 10 and WE or
tSADDCKG
tPCKRASG
tPCLKDL2
tPCKCASG0
tPCKCASG1
tPCKCASG2
tPCKCASG3
tSBADDCKG
tSADSCK0
Symbol
CC
Row Address Setup to CLK High That
Asserts RAS following a GRANTB
Port Change to Ensure tASR
CLK High to RAS Asserted
for Pending Access
CLK to DTACK Asserted for Delayed
Accesses (Programmed as DTACK0)
CLK High to CAS Asserted
for Pending Access
(t
CLK High to CAS Asserted
for Pending Access
(t
CLK High to CAS Asserted
for Pending Access
(t
CLK High to CAS Asserted
for Pending Access
(t
Bank Address Valid Setup to CLK High
that Asserts RAS for Pending Access
ADS Asserted Setup to CLK High
RAH
RAH
RAH
RAH
e
e
e
e
e
5 0V
Parameter Description
Mode 1 Dual Access
15 ns t
15 ns t
25 ns t
25 ns t
g
10% 0 C
ASC
ASC
ASC
ASC
(Continued)
e
e
e
e
0 ns)
10 ns)
0 ns)
10 ns)
k
T
A k
e
0 ns
70 C the output load capacitance is typical for 4 banks of 18 DRAMs
55
C
C
C
Min
11
12
H
H
H
5
e
e
e
8420A 21A 22A-20
C
50 pF loads on all outputs except
125 pF loads on RAS0– 3 and CAS0–3 and
380 pF loads on Q0– 8 9 10 and WE
L
Max
101
111
111
121
48
53
Min
15
12
5
C
H
Max
129
109
119
119
53
53
Min
11
11
4
8420A 21A 22A-25
C
L
Max
106
38
43
86
96
96
Min
16
11
4
C
H
Max
103
103
113
42
43
93