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PDF ICS90C64 Data sheet ( Hoja de datos )
| Número de pieza | ICS90C64 | |
| Descripción | Dual Video/Memory Clock Generator | |
| Fabricantes | Western Digital | |
| Logotipo |  |
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1 page  
PREFACE
PREFACE
The Integrated Circuit Systems ICS90C64 dual
video/memory clock generator was designed ex-
clusively to work with Western Digital video
graphics chips.
Because you get optimum video subsystem perfor-
mance when you use this video/memory clock gen-
erator with the Western Digital video graphics
chips, we have included the ICS90C64 in our
databook.
You can contact Integrated Circuit Systems at the
following address:
Integrated Circuit Systems, Inc.
Valley Forge Corporate Center
2626 Van Buren Ave., P.O. Box 968
Valley Forge, PA 19482
Phone: (215) 666-1900
Fax: (215) 666-1099
ICS90C64
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1.0 INTRODUCTION
The Integrated Circuit Systems ICS90C64 is a dual
clock generator for VGA applications. It simul-
taneously generates two clocks. One clock is forthe
video memory, and the other is the video dot clock.
This data sheet supplies sales order information, a
functional overview, signal pin details, a block
diagram, AC/DC characteristics, timing diagrams,
and package mechanical information.
1.1 DESCRIPTION
The Integrated Circuit Systems Video Graphics
Array Clock Generator (ICS90C64) is capable of
producing different output frequencies under
firmware control. The video output frequency is
derived from a 14.318 MHz system clock available
in IBM PC/XT/AT and Personal System/2 com-
puters. It is designed to work with Western Digital
20-PIN PLCC DIAGRAM
Video Graphics Array and 8514/A devices to op-
timize video subsystem performance.
The video dot clock output may be one of 15 inter-
nally generated frequencies or one external input.
The selection of the video dot clock frequency is
done through four inputs.
I IVSELO
VSEL1
VSEL2
VSEL3
VSELO and VSEL1 are latched by the SELEN
signal. VSEL2 and VSEL3 are used as direct inputs
to the VCLK selection. Table 1-1 is the truth table
for VCLK selection.
Copyright © 1991 Integrated Circuit Systems, Inc. Reprinted with permission of Integrated Circuit Systems, Inc.
Integrated Circuit Systems reserves the right to make any changes in the circuitry or specifications at any time without notice and assumes
no responsibility for the use of any circuits described herein and makes no representation that they are free from patent infringement.
11/15/91
11-1
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5 Page 
ICS90C64 VGA INTERFACE
ICS90C64
EXTCLK
CLKI
SELEN --C
PLL
DIVIDER
VCAP-
VSELO
VSEL1
VSEL2
VSEL3
II
VCLKE
MCAP
MSELO
MSEL1
MSEL2
MCLKE
PLL
DIVIDER
I
MUX
II
r--..
I-
VCLK
~ ....... MCLK
•
FIGURE 2-2. ICS90C64 FUNCTIONAL BLOCK DIAGRAM
11115/91
11-7
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| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet ICS90C64.PDF ] | |
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