lm12458mel-883 National Semiconductor Corporation, lm12458mel-883 Datasheet - Page 20

• Manufacturer Part Number: lm12458mel-883
• Description: 12-bit Sign Data Acquisition System With Self-calibration
• Manufacturer: National Semiconductor Corporation

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Timing Diagrams
INT, DMARQ, D0–D15 outputs.
10: ALE low to WR low
V
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
A
+ = V
D
+ = +5V, t
R
= t
F
= 3 ns, C
L
= 100 pF for the
FIGURE 10. Multiplexed Data Bus
20
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)
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