FD7T Series Multi-Output

CMOS Clock Oscillator

May 2008

www.pletronics.com

425-776-1880

15

Pad Functions FD74xxT:

Pad

Function

Note

Output

Function

O

t

h

e

r

S

S

C

S

S

D

1

Vsupply1

1.8V, powers internal circuitry of the oscillator. Bypass capacitor required near the

package pin.

2

Vcontrol

Frequency control input when the VCXO function is enabled

3

Ground (GND)

4

Out4 (Y5)

PLL1 frequency divider 2 and divided by 1 through 127

XXX

PLL2 frequency divider 4 and divided by 1 through 127

PLL2 frequency divider 5 and divided by 1 through 127

5

Vsupply2

1.8V, 2.5V or 3.3V supply for the output buffers. Sets CMOS output level. Bypass

capacitor required near the package pin.

6

n.c.

No connection or connect to ground

(do not connect to a signal lead)

7

n.c.

No connection or connect to ground

(do not connect to a signal lead)

8

n.c.

No connection or connect to ground

(do not connect to a signal lead)

9

Out3 (Y3)

Crystal reference frequency divider 1 and divided by 1 through 1023

X

X

X

PLL1 frequency divider 2 and divided by 1 through 127

X

X

X

PLL1 frequency divider 3 and divided by 1 through 127

X

X

X

10

Out2 (Y2)

Crystal reference frequency divider 1 and divided by 1 through 1023

X

PLL1 frequency divider 2 and divided by 1 through 127

X

X

X

11

Out1 (Y1)

Crystal reference frequency divider 1 and divided by 1 through 1023

X

PLL1 frequency divider 1 and divided by 1 through 1023

X

X

X

12

S2 / SCL

Serial Data Clock

S2

Input to select 1 of 8 preprogrammed

functions of the outputs

13

S1 / SDA

Serial Data

S1

14

S0

S0

Other

Logic “0" or tri-stated (off)

SSC

The output can have a spread spectrum centered about the output frequency.

SSD

The output can have a spread spectrum from the output frequency downward.

All unused inputs should be pulled high.