AD14060L datasheet(38/44 Pages) AD

38 / 44 page

AD14060/AD14060L

–38–

REV. A

(per data line). The hold time will be tDECAY plus the minimum

disable time (i.e., tHDWD for the write cycle).

REFERENCE

SIGNAL

tDIS

OUTPUT STARTS

DRIVING

VOH (MEASURED) – ∆V

VOL (MEASURED) + ∆V

tMEASURED

VOH (MEASURED)

VOL (MEASURED)

2.0V

1.0V

VOH (MEASURED)

VOL (MEASURED)

HIGH-IMPEDANCE STATE.

TEST CONDITIONS CAUSE

THIS VOLTAGE TO BE

APPROXIMATELY 1.5V

OUTPUT STOPS

DRIVING

tENA

tDECAY

Figure 27. Output Enable/Disable

+1.5V

50pF

OUTPUT

IOL

IOH

Figure 28. Equivalent Device Loading for AC Measure-

ments (Includes All Fixtures)

INPUT OR

OUTPUT

1.5V

Figure 29. Voltage Reference Levels for AC Measure-

ments (Except Output Enable/Disable)

Capacitive Loading

Output delays and holds are based on standard capacitive loads:

50 pF on all pins (see Figure 28). The delay and hold specifica-

tions given should be derated by a factor of 1.5 ns/50 pF for

loads other than the nominal value of 50 pF. Figures 30 and 31

show how output rise time varies with capacitance. Figure 32

graphically shows how output delays and holds vary with load

capacitance. (Note that this graph or derating does not apply to

output disable delays; see the previous section Output Disable

Time under Test Conditions.) The graphs of Figures 30, 31 and

32 may not be linear outside the ranges shown.

LOAD CAPACITANCE – pF

16.0

8.0

200

100

120

140

160

180

14.0

12.0

4.0

2.0

10.0

6.0

3.7

1.1

14.7

7.4

FALL TIME

RISE TIME

Figure 30. Typical Output Rise Time (10%–90% VDD)

vs. Load Capacitance (VDD = 5 V)

LOAD CAPACITANCE – pF

100

120

RISE TIME

FALL TIME

140

160

180

200

0.5

0.6

1.0

1.5

2.0

2.5

3.0

3.5

1.6

2.9

Figure 31. Typical Output Rise Time (0.8 V –2.0 V)

vs. Load Capacitance (VDD = 5 V)

LOAD CAPACITANCE – pF

–1

200

100

125

150

175

NOMINAL

–0.7

4.5

Figure 32. Typical Output Delay or Hold vs. Load

Capacitance (at Maximum Case Temperature) (VDD = 5 V)

AD14060L Datasheet(PDF) 38 Page - Analog Devices

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