HD74CDC857 Просмотр технического описания (PDF) - Hitachi -> Renesas Electronics

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HD74CDC857

3.3/2.5-V Phase-lock Loop Clock Driver

Hitachi -> Renesas Electronics 

HD74CDC857

Differential clock outputs are directly terminated by a 120 Ω resistor. Figure 2 is typical usage conditions

of outputs load.

V DDQ

Device

under OUT

test

OUT

V DDQ

RT=

120 Ω

Figure 2 Differential signal using direct termination resistor

Differential cross

point voltage

Vref 0.5 × VDDQ

VIH 1.7 V

VIL 0.8 V

VIH

Vref +0.35 V

Vref

Vref –0.35 V

VIL

Figure 3 CLKIN waveforms

9

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