TMS320 datasheet(29/69 Pages) TI

29 / 69 page

TMS320C25, TMS320E25

SPRS010B — MAY 1987 — REVISED NOVEMBER 1990

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77001

timing requirements over recommended operating conditions (see Note 3)

MIN

NOM

MAX

UNIT

tc(CI)

CLKIN cycle time

24.4

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 – 5

th(S)

SYNC hold time from CLKIN low

† Value derived from characterization data and not tested.

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

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

+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 3. External Clock Option

Shown above is a crystal oscillator circuit suitable for providing the input clock signal to the TMS320C25,

TMS320E25, and TMS320C25-50. Please refer to

Hardware Interfacing to the TMS320C25 (document number

SPRA014A) for details on circuit operation.

CL = 100 pF

2.15 V

RL = 825 Ω

Test

Point

From Output

Under Test

Figure 4. Test Load Circuit

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