ADSP-21364SBBCZENG datasheet(43/52 Pages) AD

43 / 52 page

ADSP-21364

Preliminary Technical Data

Rev. PrB

Page 43 of 52

September 2004

OUTPUT DRIVE CURRENTS

Figure 36 shows typical I-V characteristics for the output driv-

ers of the ADSP-21364. The curves represent the current drive

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

TEST CONDITIONS

The ac signal specifications (timing parameters) appear

Table 12 on Page 20 through Table 38 on Page 42. 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 37.

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

described in Figure 38 on Page 43. All delays (in nanoseconds)

are measured between the point that the first signal reaches

1.5 V and the point that the second signal reaches 1.5 V.

CAPACITIVE LOADING

Output delays and holds are based on standard capacitive loads:

30 pF on all pins (see Figure 37). Figure 41 shows graphically

how output delays and holds vary with load capacitance. The

graphs of Figure 39, Figure 40, and Figure 41 may not be linear

outside the ranges shown for Typical Output Delay vs. Load

Capacitance and Typical Output Rise Time (20%-80%, V=Min)

vs. Load Capacitance.

Figure 36. ADSP-21364 Typical Drive

Figure 37. Equivalent Device Loading for AC Measurements

(Includes All Fixtures)

Figure 38. Voltage Reference Levels for AC Measurements

SWEEP (VDDEXT)VOLTAGE (V)

-20

03.5

0.5

1.5

2.5

-40

-30

-10

VOL

3.11V, 125° C

3.3V, 25° C

3.47V, -45° C

VOH

3.11V, 125° C

3.3V, 25° C

3.47V, -45° C

1.5V

30pF

OUTPUT

INPUT

OUTPUT

1.5V

Figure 39. Typical Output Rise/Fall Time (20%-80%,

VDDEXT = Max)

Figure 40. Typical Output Fall Time (20%-80%,

VDDEXT = Min)

LOAD CAPACITANCE (pF)

100

250

200

150

FALL

y = 0.0467x + 1.6323

y = 0.045x + 1.524

RISE

LOAD CAPACITANCE (pF)

100

150

200

250

RISE

FALL

y = 0.049x + 1.5105

y = 0.0482x + 1.4604

ADSP-21364SBBCZENG Datasheet(PDF) 43 Page - Analog Devices

ADSP-21364SBBCZENG Datasheet(HTML) 43 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

Datasheet Download

Link URL