DP8522AV-25 National Semiconductor, DP8522AV-25 Datasheet - Page 56

• Manufacturer Part Number: DP8522AV-25
• Description: IC CTRLR 4M VRAM 25MHZ 68PLCC
• Manufacturer: National Semiconductor

Specifications of DP8522AV-25

• Controller Type: Video RAM Controller, Drivers
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 68-LCC (J-Lead)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Supply: -
• Voltage - Supply: -
• Interface: -
• Other names: *DP8522AV-25

15 0 AC Timing Parameters DP8520A DP8521A DP8522A
Unless otherwise stated V
per bank including trace capacitance (see Note 2)
Two different loads are specified
C
C
Number
450
451
452
453a
453b
453c
453d
454
455
L
L
e
e
50 pF loads on all outputs except
150 pF loads on Q0–8 9 and 10 or
tSADDCKG
tPCKRASG
tPCLKDL2
tPCKCASG0
tPCKCASG1
tPCKCASG2
tPCKCASG3
tSBADDCKG
tSADSCK0
Symbol
CC
e
5 0V
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
(tRAH
CLK High to CAS Asserted
for Pending Access
(tRAH
CLK High to CAS Asserted
for Pending Access
(tRAH
CLK High to CAS Asserted
for Pending Access
(tRAH
Bank Address Valid Setp to CLK High
That Asserts RAS for Pending Access
ADS Asserted Setup to CLK High
g
10% 0 C
Parameter Description
e
e
e
e
Mode 1 Dual Access
15 ns tASC
15 ns tASC
25 ns tASC
25 ns tASC
k
T
A k
70 C the output load capacitance is typical for 4 banks of 18 VRAMs
e
e
e
e
0 ns)
10 ns)
0 ns)
10 ns)
56
e
C
C
C
0 ns
H
H
H
e
e
e
50 pF loads on all outputs except
125 pF loads on RAS0– 3 and CAS0–3 and
380 pF loads on Q0– 8 9 and 10
Min
11
11
4
C
L
8520A 21A 22A-25
Max
106
38
43
86
96
96
(Continued)
Min
16
11
4
C
H
Max
103
103
113
42
43
93