8242 데이터 시트보기 (PDF) - Intel

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8242

UNIVERSAL PERIPHERAL INTERFACE 8-BIT SLAVE MICROCONTROLLER

Intel 

A C TESTING INPUT OUTPUT WAVEFORM

INPUT OUTPUT

UPI-41AH 42AH

A C TESTING LOAD CIRCUIT

210393 – 14

l6 MHz

DRIVING FROM EXTERNAL SOURCE-TWO OPTIONS

210393 – 15

LC OSCILLATOR MODE

210393 – 16

210393 – 17

Rise and Fall Times Should Not Exceed 10 ns Resis-

tors to VCC are Needed to Ensure VIH e 3 5V if TTL

Circuitry is Used

CRYSTAL OSCILLATOR MODE

L

C NOMINAL

45 H 20 pF 5 2 MHz

120 H 20 pF 3 2 MHz

1

fe

2q0LC

C a 3Cpp

Ce

2

Cpp j 5– 10 pF

Pin-to-Pin Capacitance

210393 – 18

Each C Should be Approximately 20 pF including Stray Capacitance

210393 – 19

C1 5 pF (STRAY 5 pF)

C2 (CRYSTAL a STRAY) 8 pF

C3 20–30 pF INCLUDING STRAY

Crystal Series Resistance Should

be Less Than 30X at 12 5 MHz

15

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