TMS320VC549 datasheet(17/60 Pages) TI

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TMS320VC549

FIXEDPOINT DIGITAL SIGNAL PROCESSOR

SPRS078F – SEPTEMBER 1998 – REVISED MAY 2000

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

multiply-by-N clock option – PLL enabled

The frequency of the reference clock provided at the X2/CLKIN pin can be multiplied by a factor of N to generate

the internal machine cycle.

When an external clock source is used, the frequency injected must conform to specifications listed in the timing

requirements table.

switching characteristics over recommended operating conditions for multiply-by-N clock option

– PLL enabled [H = 0.5tc(CO)] (see Figure 2 and Figure 4, and the recommended operating

conditions table)

PARAMETER

’549-80

’549-100

’549-120

UNIT

PARAMETER

MIN

TYP

MAX

MIN

TYP

MAX

MIN

TYP

MAX

UNIT

tc(CO)

Cycle time, CLKOUT

12.5

tc(CI)/N

8.33

tc(CI)/N

td(CIH-CO)

Delay time, X2/CLKIN high/low to

CLKOUT high/low

tf(CO)

Fall time, CLKOUT

tr(CO)

Rise time, CLKOUT

tw(COL)

Pulse duration, CLKOUT low

H–3

H–1

H–2

H–1

H–2

H–1

tw(COH)

Pulse duration, CLKOUT high

H–3

H–1

H–2

H–1

H–2

H–1

Transitory phase, PLL lock-up time

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