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DP8500 Scheda tecnica(PDF) 51 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Il numero della parte DP8500
Spiegazioni elettronici  DP8520A/DP8521A/DP8522A microCMOS Programmable 256k/1M/4M Video RAM Controller/Drivers
PDF  70 Pages
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP8500 Scheda tecnica(HTML) 51 Page - National Semiconductor (TI)

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150 AC Timing Parameters DP8520ADP8521ADP8522A (Continued)
Unless otherwise stated VCC e 50V g10% 0 C k TA k 70 C the output load capacitance is typical for 4 banks of 18 VRAMs
per bank including trace capacitance (see Note 2)
Two different loads are specified
CL e 50 pF loads on all outputs except
CL e 150 pF loads on Q0–8 9 and 10 or
CH e 50 pF loads on all outputs except
CH e 125 pF loads on RAS0–3 and CAS0–3 and
CH e 380 pF loads on Q0–8 9 and 10
Difference
8520A21A22A-25
Number
Symbol
Parameter Description
CL
CH
Min
Max
Min
Max
50
tD1
(AREQ or AREQB Negated to RAS
Negated) Minus (CLK High to RAS
14
14
Asserted)
51
tD2
(CLK High to Refresh RAS Negated)
11
11
Minus (CLK High to RAS Asserted)
52
tD3a
(ADS Asserted to RAS Asserted
(Mode 1)) Minus (AREQ Negated
4
4
to RAS Negated)
53
tD3b
(CLK High to RAS Asserted (Mode 0))
44
Minus (AREQ Negated to RAS Negated)
54
tD4
(ECAS Asserted to CAS Asserted)
b
77
b
77
Minus (ECAS Negated to CAS Negated)
55
tD5
(CLK to Refresh RAS Asserted) Minus
66
(CLK to Refresh RAS Negated)
56
tD6
(AREQ Negated to RAS Negated)
Minus (ADS Asserted to RAS
10
10
Asserted ((Mode 1))
51



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