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DP8500 Datasheet(PDF) 15 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # DP8500
Description  DP8520A/DP8521A/DP8522A microCMOS Programmable 256k/1M/4M Video RAM Controller/Drivers
PDF  70 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP8500 Datasheet(HTML) 15 Page - National Semiconductor (TI)

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40 Refresh Options (Continued)
TLF9338 – 12
FIGURE 8 External Burst Refresh (2 Periods of RAS Precharge
2 Periods of Refresh RAS Low during Refresh Programmed)
TLF9338 – 13
FIGURE 9a Externally Controlled Single and Burst Refresh with Refresh Request (RFRQ) Output
(2 Periods of RAS Low during Refresh Programmed)
TLF9338 – 14
FIGURE 9b Automatic Internal Refresh with Refresh Request (3T of RAS low during refresh programmed)
In
Figures 9a and 9b where the DP8520A21A22A operate in the refresh requestacknowledge mode the RFIP output pin functions as RFRQ
An RFIP timing waveform is included in the figure solely for the purpose of simplifying the diagrams
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