LM12458CIVF datasheet(20/36 Pages) NSC

Part #	LM12458CIVF

Description	12-Bit Sign Data Acquisition System with Self-Calibration

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Manufacturer	NSC [National Semiconductor (TI)]

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Timing Diagrams

V

A+=VD+ = +5V, tR =tF = 3 ns, CL = 100 pF for the

INT, DMARQ, D0–D15 outputs.

1, 3: CS or Address valid to ALE low set-up time.

2, 4: CS or Address valid to ALE low hold time.

5: ALE pulse width

6: RD high to next ALE high

7: ALE low to RD low

8: RD pulse width

9: RD high to next RD or WR low

10: ALE low to WR low

11: WR pulse width

12: WR high to next ALE high

13: WR high to next WR or RD low

14: Data valid to WR high set-up time

15: Data valid to WR high hold time

16: RD low to data bus out of TRI-STATE

17: RD high to TRI-STATE

18: RD low to data valid (access time)

01126416

FIGURE 10. Multiplexed Data Bus

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