PC87393F datasheet(139/148 Pages) NSC

139 / 148 page

9.0 Device Characteristics (Continued)

139

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9.4

AC ELECTRICAL CHARACTERISTICS

9.4.1

AC Test Conditions

Figure 32. AC Test Conditions, TA =0 °Cto70 °C, VDD = 3.3 V ±10%

Notes:

1. CL = 100 pF for all output pins (except OPCI);

CL = 50 pF for OPCI output pins;

These values include both jig and oscilloscope capacitance.

2. S1 = Open for push-pull output pins.

S1 = VDD for high impedance to active low and active low to high impedance measurements.

S1 = GND for high impedance to active high and active high to high impedance measurements.

RL = 1.0KΩ for µP interface pins.

3. For the FDC open-drive interface pins, S1 = VDD and RL = 150Ω.

9.4.2

Clock Timing

Symbol

Parameter

48 MHz

Min

Max

Unit

tCH

Clock High Pulse Width1

1. Not tested. Guaranteed by design.

8.4

tCL

Clock Low Pulse Width1

8.4

tCP

Clock Period 12

2. For the 14.31818 MHz clock, required tolerance is 200

ppm (max).

21.5

Device

Under

Test

0.1

µf

Input

Output

Load Circuit (Notes 1, 2, 3)

AC Testing Input, Output Waveform

VDD

2.4

0.4

2.0

0.8

Test Points

2.0

0.8

CLKIN

tCL

tCP

tCH

PC87393F Datasheet(PDF) 139 Page - National Semiconductor (TI)

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