TMS320 datasheet(36/69 Pages) TI

36 / 69 page

TMS320C25-50

SPRS010B — MAY 1987 — REVISED NOVEMBER 1990

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77001

+5 V

fcrystal

4.7 k

Ω

10 k

Ω

74HC04

F11

CLKIN

47 pF

74AS04

10 k

Ω

C = 20 pF

0.1

µF

TMS320C25

TMS320C25-50

TMS320E25

40.96

51.20

40.96

1.8

1.0

1.8

fcrystal, (MHz)

L, (

µH)

Figure 7. External Clock Option

timing requirements over recommended operating conditions (see Note 3)

MIN

NOM

MAX

UNIT

tc(CI)

CLKIN cycle time

19.5

150

tf(CI)

CLKIN fall time

5 †

tr(CI)

CLKIN rise time

5†

tw(CIL)

CLKIN low pulse duration, tc(CI) = 50 ns (see Note 4)

tw(CIH)

CLKIN high pulse duration, tc(CI) = 50 ns (see Note 4)

tsu(S)

SYNC setup time before CLKIN low

Q – 4

th(S)

SYNC hold time from CLKIN low

† Value derived from characterization data and not tested.

NOTES: 3. Q = 1/4 tc(C)

4. CLKIN duty cycle [tr(CI) + tw(CIH)]/tc(CI) must be within 40-60%.

TMS320 Datasheet(PDF) 36 Page - Texas Instruments

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