PC8374T datasheet(28/48 Pages) NSC

28 / 48 page

2.0 Device Characteristics (Continued)

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Revision 1.1

2.4

AC ELECTRICAL CHARACTERISTICS

2.4.1

AC Test Conditions

Figure 3. AC Test Conditions, TA = 0°C to 70°C, VSUP = 3.3V ±10%

Notes:

1. VSUP is either VDD3 or VSB3, according to the pin power well.

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

− C

L = 100 pF for Serial Port 1 and 2 pins (see Section 1.4.2 on page 10), Parallel Port pins

(see Section 1.4.4 on page 11) and Floppy Disk Controller pins (see Section 1.4.5 on page 12).

− C

L = 40 pF for IDE_RSTDRV pin.

− C

L = 400 pF for SMBus pins (see “SMBus Voltage Translation and Isolation Timing” on page 44).

These values include both jig and oscilloscope capacitance.

3. 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

4. For the FDC open-drain interface pins, S1 = VDD3 and RL = 150Ω.

2.4.2

Reset Timing

VSB Power-Up Reset

Symbol Figure

Description

Reference Conditions

Min1

1. Not tested. Guaranteed by design.

Max1

tIRST

Internal Power-Up Reset

Time

VSB3 power-up to

end of internal reset

Ended by

32 KHz

Clock Domain

t32KW + t32KVAL

2 +

17 * tCP

2. t32KW + t32KVAL from VSB3 power-up to 32 KHz domain toggling; see “Low-Frequency Clock Timing” on page 32.

Ended by

PCI_RESET

tLRST

PCI_RESET active time

VSB3 power-up to end of PCI_RESET

10 ms

tIPLV

Internal VsbStrap1 strap pull-

up resistor, valid time3

3. Active only during VSB3 Power-Up reset.

Before end of internal reset

tIRST

tEPLV

External VsbStrap1 strap pull-

down resistor, valid time

Before end of internal reset

tIRST

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

(unless otherwise specified)

PC8374T Datasheet(PDF) 28 Page - National Semiconductor (TI)

PC8374T Datasheet(HTML) 28 Page - National Semiconductor (TI)

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