Intel UPI-C42, UPI-L42

UPI-C42/UPI-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 e3.5V

if TTL Circuitry is Used.

LC OSCILLATOR MODE

L C NOMINAL

fe1

2q0LCÊ

45H 20 pF 5.2 MHz

120H 20 pF 3.2 MHz

CÊeCa3Cpp

Cpp j5–10pF

Pin-to-PinCapacitance

290414–20

EachC Should be Approximately 20 pF, including Stray Capacitance.

CRYSTAL OSCILLATOR MODE

290414–21

C1 5 pF (STRAY 5 pF)

C2 (CRYSTAL aSTRAY) 8 pF

C3 20 –30 pF INCLUDING STRAY

Crystal Series Resistance Should

be Less Than 30Xat 12.5 MHz.

XTAL1Configuration Table

XTAL1Connection

1)to Ground 2)10 KXResistor 3) Not Connected

toGround

Notrecommended for CHMOS Recommended configuration for Lowpower configuration

designs.Causes approximately designs which will use both recommended for CHMOS only

16mA of additional current flow NMOS and CHMOS parts. This designs to provide lowest

throughthe XTAL1 pin on UPI- configuration limits the additional possible power consumption.

C42and approximately 11 mA of current through the XTAL1 pin to This configuration will not work

additionalcurrent through XTAL1 approximately 1 mA, while with the NMOS device.

onthe UPI-L42. maintaining compatibility with the

NMOSdevice.