74FCT807BTPYPI datasheet(6/8 Pages) IDT

6 / 8 page

COMMERCIALANDINDUSTRIALTEMPERATURERANGES

IDT74FCT807BT/CT

FAST CMOS 1-TO-10 CLOCK DRIVER

Pulse

Generator

R T

D.U.T.

V CC

V IN

V OUT

50pF

Pulse

Generator

R T

D.U.T.

VCC

V IN

V OUT

C L

30pF

Pulse

Generator

R T

D.U.T.

VCC

V IN

V OUT

10pF

220pF

Pulse

Generator

R T

D.U.T.

V CC

V IN

V OUT

100

10pF

V CC

Pulse

Generator

R T

D.U.T.

VCC

V IN

C L

V OUT

50pF

500

7.0V

The capacitor value for AC termination is determined by the operating frequency. For

very low frequencies a higher capacitor value should be selected.

TEST CIRCUITS

Fig. 5: Enable and Disable Time Circuit

DEFINITIONS:

CL = Load capacitance: includes jig and probe capacitance.

RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.

Test

Switch

Disable LOW

Enable LOW

Disable HIGH

GND

Enable HIGH

SWITCH POSITION

Fig. 1: 50

Ω

Ω to VCC/2, CL = 10pF

Fig. 2: 50

Ω

Ω AC Termination, CL = 10pF

Fig. 3: CL = 30pF Circuit

Fig. 4: CL = 50pF Circuit

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