Symbol

Pin No

IO

Description

28

g

10% relative to ground Bypass capacitors should be placed as close as possible across the

through chokes

DGND

15

Digital Ground

Power supply return for the internal circuitry DGND AGND and EXT GND pins

should be tied together

EXTGND

1

External Ground

Power supply return for the input and output buffers DGND AGND and EXT GND

pins should be tied together

11

AGND

14

Analog Ground

Power supply return for the critical analog circuitry DGND EXTGND and AGND

pins should be tied together

VCO BIAS

12

I

VCO Bias

TTL compatible input that sets the nominal frequency for the VCO by the selection of the

125 MHz on the RXC outputs

40 Electrical Characteristics

41 ABSOLUTE MAXIMUM RATINGS

If MilitaryAerospace specified devices are required

please contact the National Semiconductor Sales

OfficeDistributors for availability and specifications

Storage Temperature

b

TTL Signals

Inputs

55V

Outputs

55V

ECL Signals

Output Current

b

20 mA

Supplies

b

b

b

ESD Susceptibility

2000V

42 RECOMMENDED OPERATING CONDITIONS

Symbol

Parameter

Min

Typ

Max

Units

Power Supply

475

5

525

V

High Level

TTL

20

V

Input Voltage

ECL

Low Level

TTL

08

V

Input Voltage

ECL

High Level

TTL Outputs

b

04

mA

Output Current

(Note 1)

Low Level

TTL Outputs

40

mA

Output Current

(Note 1)

FVCO

VCO Frequency

250

MHz

FXTL

Crystal Frequency

10416667

MHz

TA

Operating Temperature

0

25

70

C

Note 1

TTL outputs include CLK DET and TTLSD

7