DP8522AV-25 National Semiconductor, DP8522AV-25 Datasheet - Page 53

• 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
200
201
202
204
205
206
207
208
209a
209b
209c
209d
210
211
212
L
L
e
e
50 pF loads on all outputs except
150 pF loads on Q0–8 9 and 10 or
tSRFCK
tSDRFCK
tSXRFCK
tPCKRFL
tPARQRF
tPCKRFH
tPCKRFRASH
tPCKRFRASL
tPCKCL0
tPCKCL1
tPCKCL2
tPCKCL3
tWRFSH
tPCKRQL
tPCKRQH
Symbol
CC
e
5 0V
g
RFSH Asserted Setup to CLK High
DISRFSH Asserted Setup to CLK High
EXTENDRF Setup to CLK High
CLK High to RFIP Asserted
AREQ Negated to RFIP Asserted
CLK High to RFIP Negated
CLK High to Refresh RAS Negated
CLK High to Refresh RAS Asserted
CLK High to CAS Asserted
during Error Scrubbing
(tRAH
CLK High to CAS Asserted
during Error Scrubbing
(tRAH
CLK High to CAS Asserted
during Error Scrubbing
(tRAH
CLK High to CAS Asserted
during Error Scrubbing
(tRAH
RFSH Pulse Width
CLK High to RFRQ Asserted
CLK High to RFRQ Negated
10% 0 C
e
e
e
e
Refresh Parameter
15 ns tASC
15 ns tASC
25 ns tASC
25 ns tASC
k
Description
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)
53
C
C
C
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
22
22
12
15
C
L
8520A 21A 22A-25
Max
31
50
51
29
23
73
83
83
93
40
40
(Continued)
Min
22
22
15
12
C
H
Max
100
31
50
51
33
27
80
90
90
40
40