TMS320UC5402 datasheet(32/63 Pages) TI

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TMS320UC5402

FIXED-POINT DIGITAL SIGNAL PROCESSOR

SPRS096A – APRIL 1999 – REVISED DECEMBER 1999

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

PARAMETER MEASUREMENT INFORMATION

Timing parameters provided are measured using the load circuit in Figure 8 on all device output pins.

Tester Pin

Electronics

VLoad

IOL

IOH

Output

Under

Test

Ω

Where:

IOL

= 1.5 mA (all outputs)

IOH

= 300

µA (all outputs)

VLoad = 0.855 V

= 40 pF typical load circuit capacitance

Figure 8. 1.8-V Test Load Circuit

internal oscillator with external crystal

The internal oscillator is enabled by connecting a crystal across X1 and X2/CLKIN. The frequency of CLKOUT

is a multiple of the oscillator frequency. The multiply ratio is determined by the bit settings in the CLKMD register.

The crystal should be in fundamental-mode operation, and parallel resonant, with an effective series resistance

of 30

Ω and power dissipation of 1 mW. The circuit shown in Figure 9 represents fundamental-mode operation.

The connection of the required circuit, consisting of the crystal and two load capacitors, is shown in Figure 9.

The load capacitors, C1 and C2, should be chosen such that the equation below is satisfied. CL in the equation

is the load specified for the crystal.

1C2

(

) C

recommended operating conditions of internal oscillator with external crystal (see Figure 9)

MIN

NOM

MAX

UNIT

fclock

Input clock frequency

MHz

X2/CLKIN

Crystal

Figure 9. Internal Oscillator With External Crystal

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