SMJ320C25, SMJ320C2550

DIGITAL SIGNAL PROCESSOR

SGUS007D – AUGUST 1988 – REVISED OCTOBER 2001

21

POST OFFICE BOX 1443

RS, INT, BIO, and XF timing

switching characteristics over recommended operating conditions (see Note 1)

PARAMETER

SMJ320C25-50

SMJ320C25

UNIT

PARAMETER

MIN

TYP

MAX

MIN

TYP

MAX

UNIT

td(RS)

Delay time, CLKOUT1 low to reset state entered

22†

22†

ns

td(IACK) Delay time, CLKOUT1 to IACK valid

–5†

0

7

–8†

0

8

ns

td(XF)

Delay time, XF valid before falling edge of STRB

Q – 10

Q – 12

ns

timing requirements over recommended operating conditions (see Note 1)

SMJ320C25-50

SMJ320C25

UNIT

MIN

MAX

MIN

MAX

UNIT

tsu(IN)

Setup time, INT/BIO/RS before CLKOUT1 high

25

32

ns

th(IN)

Hold time, INT/BIO/RS after CLKOUT1 high

0

0

ns

tw(IN)

Pulse duration, INT/BIO low

tc(C)

tc(C)

ns

tw(RS)

Pulse duration, RS low

3tc(C)

3tc(C)

ns

switching characteristics over recommended operating conditions (see Note 1)

PARAMETER

SMJ320C25-50

SMJ320C25

UNIT

PARAMETER

MIN

TYP

MAX

MIN

TYP

MAX

UNIT

td(C1L-AL) Delay time, HOLDA low after CLKOUT1 low

–1

11

–1

10

ns

tdis(AL-A) Disable time, HOLDA low to address three-state

0

0

ns

tdis(C1L-A)

Disable time, address three-state after CLKOUT1 low (HOLD

mode, see Note 7 )

20†

20†

ns

td(HH-AH) Delay time, HOLD high to HOLDA high

19

25

ns

ten(A-C1L)

Enable time, address driven before CLKOUT1 low (HOLD mode,

see Note 7 )

8†

8†

ns

timing requirements over recommended operating conditions (see Note 1)

SMJ320C25-50

SMJ320C25

UNIT

MIN

MAX

MIN

MAX

UNIT

td(C2H-H) Delay time, HOLD valid after CLKOUT2 high

Q – 19

Q – 24

ns

† These values are derived from characterization data and not tested.

NOTES:

1. Q = 1/4tc(C)

6. RS, INT, and BIO are asynchronous inputs and can occur at any time during a clock cycle. However, if the specified setup time is

met, the exact sequence shown in the timing diagram occurs. INT/BIO fall time must be less than 8 ns.

7. A15–A0, PS, DS, IS, STRB, and R/W timings are all included in timings referenced as ’”address”.