ADZS-21364-EZLITE【PDF 46/60 页】KIT EVAL EZ LITE ADDS-21364

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ADSP-21362/ADSP-21363/ADSP-21364/ADSP-21365/ADSP-21366

OUTPUT DRIVE CURRENTS

Figure 37 shows typical I-V characteristics for the output driv-

ers of the processor. The curves represent the current drive

capability of the output drivers as a function of output voltage.

40

CAPACITIVE LOADING

Output delays and holds are based on standard capacitive loads:

30 pF on all pins (see Figure 38 ). Figure 42 shows graphically

how output delays and holds vary with load capacitance. The

graphs of Figure 40 , Figure 41 , and Figure 42 may not be linear

outside the ranges shown for Typical Output Delay versus Load

Capacitance and Typical Output Rise Time (20% to 80%,

3 0

20

VOH

3 . 3 V, +25°C

3 .47V, - 45°C

V = Min) versus Load Capacitance.

12

10

3 .11V, +125°C

0

-10

10

8

y = 0.0467x + 1.6323

RISE

FALL

3 .11V, +125°C

-20

3 . 3 V, +25°C

6

- 3 0

VOL

-40

0

0.5

3 .47V, -45°C

1.0 1.5

2.0

2.5

3 .0

3 .5

4

y = 0.045x + 1.524

S WEEP (V DDEXT ) VOLTAGE (V)

Figure 37. ADSP-2136x Typical Drive

2

0

0

50

100

150

200

250

TEST CONDITIONS

The ac signal specifications (timing parameters) appear in

Table 12 on Page 20 through Table 41 on Page 45 . These include

output disable time, output enable time, and capacitive loading.

The timing specifications for the SHARC apply for the voltage

reference levels in Figure 38 .

Timing is measured on signals when they cross the 1.5 V level as

described in Figure 39 . All delays (in nanoseconds) are mea-

sured between the point that the first signal reaches 1.5 V and

12

10

LOAD CAPACITANCE (pF)

Figure 40. Typical Output Rise/Fall Time

(20% to 80%, V DDEXT = Max)

RI S E

the point that the second signal reaches 1.5 V.

8

y = 0.049x + 1.5105

FALL

TO

OUTPUT

PIN

30pF

V LOAD

6

y = 0.04 8 2x + 1.4604

4

Figure 38. Equivalent Device Loading for AC Measurements

2

(Includes All Fixtures)

0

0

50

100

150

200

250

INPUT

OR

1.5V

1.5V

LOAD CAPACITANCE (pF)

OUTPUT

Figure 41. Typical Output Rise/Fall Time

(20% to 80%, V DDEXT = Min)

Figure 39. Voltage Reference Levels for AC Measurements

Rev. J |

Page 46 of 60 |

July 2013

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