TMS32025 datasheet(38/69 Pages) TI

38 / 69 page

TMS320C25-50

SPRS010B — MAY 1987 — REVISED NOVEMBER 1990

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77001

RS, INT, BIO, AND XF TIMING

switching characteristics over recommended operating conditions (see Notes 3 and 16)

PARAMETER

MIN

TYP

MAX

UNIT

td(RS)

CLKOUT1 low to reset state entered

22†

td(IACK)

CLKOUT1 to IACK valid

– 5

td(XF)

XF valid before falling edge of STRB

Q – 8

† Value derived from characterization data and not tested.

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

16. RS, INT, BIO are asynchronous inputs and can occur at any time during a clock cycle.

timing requirements over recommended operating conditions (see Notes 3 and 16)

MIN

NOM

MAX

UNIT

tsu(IN)

INT, BIO, RS setup before CLKOUT1 high

th(IN)

INT, BIO, RS hold after CLKOUT1 high

tf(IN)

INT, BIO fall time

8†

tw(IN)

INT, BIO low pulse duration

tc(C)

tw(RS)

RS low pulse duration

3tc(C)

† Value derived from characterization data and not tested.

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

16. RS, INT, BIO are asynchronous inputs and can occur at any time during a clock cycle.

HOLD TIMING

switching characteristics over recommended operating conditions (see Note 3)

PARAMETER

MIN

TYP

MAX

UNIT

td(CIL-AL)

HOLDA low after CLKOUT1 low

1 †

tdis(AL-A)

HOLDA low to address high-impedance

0 †

tdis(CIL-A)

Address high-impedance after CLKOUT1 low (HOLD mode, see Note 17)

20 †

td(HH-AH)

HOLD high to HOLDA high

ten(A-CIL)

Address driven before CLKOUT1 low (HOLD mode, see Note 17)

8 †

† Value derived from characterization data and not tested.

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

17. A15-A0, PS, DS, STRB, and R/W timings are all included in timings referenced as “address”.

timing requirements over recommended operating conditions (see Note 3)

MIN

NOM

MAX

UNIT

td(C2H-H)

HOLD valid after CLKOUT2 high

Q – 19

NOTE 3: Q = 1/4 tc(C)

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