Typical Output Configuration

Pin Description

PIN NUMBER

PIN SYMBOL

TYPE

DESCRIPTION

1

• FS0

IN

Frequency Select LSB.

2

XTAL1

IN

Crystal Interface/External Oscillator Input.

3

XTAL2

OUT

Crystal Interface.

4

• STROBE

IN

Control For Frequency Select Latch, also performs automatic

RAMDAC reset.

5

VSS

--

Device Ground (Both pins must be connected.)

6

VSS

--

Device Ground (Both pins must be connected.)

7

LD

OUT

Load Output. This output is at CLK frequency divided by N1.

8

• FS4

IN

Frequency Select MSB.

9

CLK

OUT

Clock Output Inverted.

10

CLK

OUT

Clock Output Non-Inverted.

11

VDDO

--

Output Stage Power (Both pins must be connected).

12

VDDO

--

Output Stage Power (Both pins must be connected).

13

VDD

--

PLL System Power.

14

• FS3

IN

Frequency Select.

15

• FS2

IN

Frequency Select.

16

• FS1

IN

Frequency Select.

• = inputs with internal pull-up resistor

Notes:

CLK & CLK outputs are pseudo-ECL. Logic low level is set by the ratio of the resistors stacked across the power supply

• 160)/(110 +160) in the example shown above.

The above values are a good starting point for RAMDAC or clock generator interface.

Figure 3

ICS1567

3