THS1009

SLAS287A – AUGUST 2000 – REVISED DECEMBER 2002

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24

Read Timing (using R/W, CS0-controlled)

Figure 31 shows the read-timing behavior when the WR(R/W) input is programmed as a combined read-write input

R/W. The RD input has to be tied to high-level in this configuration. This timing is called CS0-controlled because CS0

is the last external signal of CS0, CS1, and R/W which becomes valid. The reading of the data should be done with

a certain timing relative to the conversion clock CONV_CLK, as illustrated in Figure 31.

10%

10%

90%

90%

90%

90%

90%

10%

10%

tsu(CONV_CLKL–CSOL)

tsu(CSOH–CONV_CLKL)

tw(CS)

tsu(R/W)

th(R/W)

ta

th

CONV_CLK

CS0

CS1

R/W

RD

D(0–11)

Figure 31. Read Timing Diagram Using R/W (CS0-controlled)

Read Timing Parameter (CS0-controlled)

PARAMETER

MIN

TYP

MAX

UNIT

tsu(CONV_CLKL–CSOL)

Setup time, CONV_CLK low before CS valid

10

ns

tsu(CSOH–CONV_CLKL)

Setup time, CS invalid to CONV_CLK low

20

ns

tsu(R/W)

Setup time, R/W high to last CS valid

0

ns

ta

Access time, last CS valid to data valid

0

10

ns

th

Hold time, first CS invalid to data invalid

0

5

ns

th(R/W)

Hold time, first external CS invalid to R/W change

5

ns

tw(CS)

Pulse duration, CS active

10

ns