TMS370CX2XFN datasheet(45/60 Pages) TI

45 / 60 page

TMS370Cx2x

8-BIT MICROCONTROLLER

SPNS018C – FEBRUARY 1993 – REVISED FEBRUARY 1997

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

External

Clock Signal

XTAL1

XTAL2/CLKIN

(see Note B)

Crystal/Ceramic

Resonator

(see Note A)

XTAL1

XTAL2/CLKIN

(see Note B)

NOTES: A. The crystal/ceramic resonator frequency is four times the reciprocal of the system clock period.

B. The values of C1 and C2 are typically 15 pF and C3 value is typically 50 pF. See the manufacturer’s recommendations for ceramic

resonators.

Figure 15.

Recommended Crystal/Clock Connections

1.2 k

Ω

20 pF

Load Voltage

Case 1: VO = VOH = 2.4 V; Load Voltage = 0 V

Case 2: VO = VOL = 0.4 V; Load Voltage = 2.1 V

NOTE A: All measurements are made with the pin loading as shown unless otherwise noted. All measurements are made with XTAL2/CLKIN

driven by an external square wave signal with a 50% duty cycle and rise and fall times less than 10 ns unless otherwise stated.

Figure 16. Typical Output Load Circuit (See Note A)

VCC

GND

300

Ω

I/O

Pin Data

Output

Enable

VCC

GND

INT1

6 k

Ω

Figure 17. Typical Buffer Circuitry

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