PC87427 datasheet(26/46 Pages) NSC

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2.0 Device Characteristics (Continued)

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Revision 1.0

2.4

PACKAGE THERMAL INFORMATION

Thermal resistance (degrees C/W) ThetaJC and ThetaJA values for the PC87427 package are as follows:

Table 4. Theta (

Θ) J Values

Note: Airflow for ThetaJA values is measured in linear feet per minute (lfpm).

2.5

AC ELECTRICAL CHARACTERISTICS

2.5.1

AC Test Conditions

Figure 3. AC Test Conditions, TA =0°Cto70°C, VSUP = 3.3V ±10%

Notes:

1. VSUP is VDD, VSB or VPP according to the pin power well.

1. CL = 50 pF for all output pins except the following pin groups:

CL = 100 pF for Serial Port 1, 2 and M (see Section 1.4.4 on page 10) and

Floppy Disk Controller (see Section 1.4.9) pins;

CL = 40 pF for HFCKOUT pin;

CL = 400 pF for SMBus pins (see Section 1.4.2 on page 9);

These values include both jig and oscilloscope capacitance.

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

S1 = VSUP for high impedance to active low and active low to high impedance transition measurements.

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

RL = 1.0 KΩ for all the pins.

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

Package Type

ThetaJA@0 lfpm ThetaJA@225 lfpm ThetaJA@500 lfpm

ThetaJC

128 PQFP

35.8

31.1

14.9

Device

Under

Test

0.1

µf

Input

Output

Load Circuit

AC Testing Input, Output Waveform

VSUP

2.4

0.4

2.0

0.8

Test Points

2.0

0.8

PC87427 Datasheet(PDF) 26 Page - National Semiconductor (TI)

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