CH9294(1995) データシートの表示（PDF） - Unspecified

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CH9294
(Rev.:1995)

Dual Graphics Clock Generator

Unspecified 

CHRONTEL

CH9294

Dual Graphics Clock Generator

Features

• Generates 16 preset video clocks, 8 preset memory

clocks, and buffers the reference frequency output

• Built-in power supply conditioning circuitry

provides excellent jitter performance and eliminates

the need for an external VDD dropping resistor

• Requires only two external components: one

14.318 MHz crystal and one 0.1 µF decoupling

capacitor

• Supports VGA, Super-VGA, XGA™, and 8514

graphic standards

• Supports output frequencies up to 135 MHz

• Drop-in replacement for ICS2494 and AV9194

• CMOS technology in 20-pin PDIP and SOIC

• 5V or 3.3V supply. For specific details on the

3.3V version, please consult Chrontel.

XGA is a trademark of IBM

Description

CH9294 is a dual PLL clock generator designed for

high frequency graphics applications. It can also be

used in applications requiring multiple clocks, such as

PC motherboards, disk drives, CD-ROM systems, and

modems.

The CH9294 provides separate memory clock (MCLK)

and video clock (VCLK) outputs, and a 14.318 MHz

reference clock output. Other input frequencies can be

used to obtain different output frequencies. Internal

loop filter elements minimize external part count.

The STROBE pin should be tied high or left open if not

used. FSx pins are latched on the falling edge of

STROBE.

FS[3:0]

STROBE

XI

XO/FIN

MS[2:0]

Rev. 2.1, 8/25/95

LATCH

ROM

VDD

AVDD

OSC

VPLL

MPLL

ROM

GND

Figure 1: Block Diagram

AGND

VCLK

XOUT

MCLK

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