8XC196KB8XC196KB16

EXTERNAL CLOCK DRIVE

Symbol

Parameter

Min

Max

Units

Oscillator Frequency 12 MHz

35

120

MHz

Oscillator Frequency 16 MHz

35

16

MHz

Oscillator Period 12 MHz

833

286

ns

Oscillator Period 16 MHz

625

286

ns

High Time

2125

ns

Low Time

2125

ns

Rise Time

10

ns

Fall Time

10

ns

EXTERNAL CLOCK DRIVE WAVEFORMS

270909 – 10

An external oscillator may encounter as much as a 100 pF load at XTAL1 when it starts-up This is due to

EXTERNAL CRYSTAL CONNECTIONS

270909 – 11

NOTE

Keep oscillator components close to chip and use

ceramic resonators consult manufacturer for recom-

mended circuitry

EXTERNAL CLOCK CONNECTIONS

270909 – 12

Required if open-collector TTL driver used

Not needed if CMOS driver is used

AC TESTING INPUT OUTPUT WAVEFORMS

270909 – 13

AC Testing inputs are driven at 24V for a Logic ‘‘1’’ and 045V for

a Logic ‘‘0’’ Timing measurements are made at 20V for a Logic

‘‘1’’ and 08V for a Logic ‘‘0’’

FLOAT WAVEFORMS

270909 – 14

For Timing Purposes a Port Pin is no Longer Floating when a

200 mV change from Load Voltage Occurs and Begins to Float

15