adsp-21462 Analog Devices, Inc., adsp-21462 Datasheet - Page 52

• Manufacturer Part Number: adsp-21462
• Description: Sharc Processor
• Manufacturer: Analog Devices, Inc.

ADSP-21462/ADSP-21465/ADSP-21467/ADSP-21469
OUTPUT DRIVE CURRENTS
Figure 39
ers of the ADSP-2146x. 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 in
Table 16 on Page 24
output disable time, output enable time, and capacitive loading.
The timing specifications for the SHARC apply for the voltage
reference levels in
Timing is measured on signals when they cross the 1.5 V level as
described in
sured between the point that the first signal reaches 1.5 V and
the point that the second signal reaches 1.5 V.
12
10
8
4
6
2
0
V
0
LOAD
NOTES:
THE WORST CASE TRANSMISSION LINE DELAY IS SHOWN AND CAN BE USED
FOR THE OUTPUT TIMING ANALYSIS TO REFELECT THE TRANSMISSION LINE
EFFECT AND MUST BE CONSIDERED. THE TRANSMISSION LINE (TD), IS FOR
LOAD ONLY AND DOES NOT AFFECT THE DATA SHEET TIMING SPECIFICATIONS.
ANALOG DEVICES RECOMMENDS USING THE IBIS MODEL TIMING FOR A GIVEN
SYSTEM REQUIREMENT. IF NECESSARY, A SYSTEM MAY INCORPORATE
EXTERNAL DRIVERS TO COMPENSATE FOR ANY TIMING DIFFERENCES.
4pF
Figure 40. Equivalent Device Loading for AC Measurements
shows typical I-V characteristics for the output driv-
Figure 39. Typical Drive at Junction Temperature
50
Figure
50
70
50
400
2pF
Figure
41. All delays (in nanoseconds) are mea-
through
TBD
(Includes All Fixtures)
100
40.
45
0.5pF
TESTER PIN ELECTRONICS
Table 47 on Page
150
ZO = 50 (impedance)
TD = 4.04
T1
1.18 ns
200
50. These include
Rev. PrC | Page 52 of 62 | January 2009
OUTPUT
DUT
250
CAPACITIVE LOADING
Output delays and holds are based on standard capacitive loads:
30 pF on all pins (see
how output delays and holds vary with load capacitance. The
graphs of
outside the ranges shown for Typical Output Delay vs. Load
Capacitance and Typical Output Rise Time (20% to 80%,
V = Min) vs. Load Capacitance.
12
12
10
10
8
4
8
4
6
2
0
6
2
0
0
0
OUTPUT
Figure 41. Voltage Reference Levels for AC Measurements
INPUT
Figure
Figure 42. Typical Output Rise/Fall Time (20% to 80%,
Figure 43. Typical Output Rise/Fall Time (20% to 80%,
OR
50
50
1.5V
42,
Preliminary Technical Data
Figure
Figure
TBD
TBD
100
100
V
V
DD_EXT
DD_EXT
43, and
40).
= Max)
= Min)
Figure 44
150
150
Figure 44
200
200
shows graphically
may not be linear
250
250
1.5V