P8042 datasheet(20/25 Pages) INTEL

20 / 25 page

UPI-C42UPI-L42

DRIVING FROM AN EXTERNAL SOURCE

290414 – 18

NOTE

See XTAL1 Configuration Table

290414 – 19

Rise and Fall Times Should Not

Exceed 10 ns Resistors to VCC

are Needed to Ensure VIH e 35V

if TTL Circuitry is Used

LC OSCILLATOR MODE

NOMINAL

f e

0LC

45 H 20 pF

52 MHz

120 H 20 pF

32 MHz

C e

C a 3Cpp

Cpp j 5–10 pF

Pin-to-Pin Capacitance

290414 – 20

Each C Should be Approximately 20 pF including Stray Capacitance

CRYSTAL OSCILLATOR MODE

290414 – 21

5 pF (STRAY 5 pF)

(CRYSTAL a STRAY) 8 pF

20 – 30 pF INCLUDING STRAY

Crystal Series Resistance Should

be Less Than 30X at 125 MHz

XTAL1 Configuration Table

XTAL1 Connection

1) to Ground

2) 10 KX Resistor

3) Not Connected

to Ground

Not recommended for CHMOS

Recommended configuration for

Low power configuration

designs Causes approximately

designs which will use both

recommended for CHMOS only

16 mA of additional current flow

NMOS and CHMOS parts This

designs to provide lowest

through the XTAL1 pin on UPI-

configuration limits the additional

possible power consumption

C42 and approximately 11 mA of

current through the XTAL1 pin to

This configuration will not work

additional current through XTAL1

approximately 1 mA while

with the NMOS device

on the UPI-L42

maintaining compatibility with the

NMOS device

P8042 데이터시트(PDF) 20 Page - Intel Corporation

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