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ADSP-BF522/ADSP-BF523/ADSP-BF524/ADSP-BF525/ADSP-BF526/ADSP-BF527
60
TEST CONDITIONS
50
40
30
20
10
0
–10
–20
V DDEXT = 3.6V @ – 40 °C
V DDEXT = 3.3V @ 25 °C
V DDEXT = 3.0V @ 105 °C
All Timing Requirements appearing in this data sheet were
measured under the conditions described in this section.
Figure 58 shows the measurement point for AC measurements
(except output enable/disable). The measurement point V MEAS is
V DDEXT /2 or V DDMEM /2 for V DDEXT /V DDMEM (nominal) = 1.8 V/
2.5 V/3.3 V.
–30
–40
V OL
INPUT
OR
OUTPUT
V MEAS
V MEAS
–50
–60
0
0.5
1.0
1.5 2.0 2.5
SOURCE VOLTAGE (V)
3.0
3.5
Figure 58. Voltage Reference Levels for AC Measurements
(Except Output Enable/Disable)
Figure 55. Driver Type E Current (3.3V V DDEXT /V DDMEM )
Output Enable Time Measurement
40
30
20
10
0
–10
–20
V DDEXT = 2.75V @ – 40 °C
V DDEXT = 2.5V @ 25 °C
V DDEXT = 2.25V @ 105 °C
V OL
Output balls are considered to be enabled when they have made
a transition from a high impedance state to the point when they
start driving.
The output enable time t ENA is the interval from the point when
a reference signal reaches a high or low voltage level to the point
when the output starts driving as shown on the right side of
Figure 59 .
REFERENCE
SIGNAL
–30
–40
t DIS
t DIS_MEASURED
t ENA
t ENA_MEASURED
0
0.5
1.0
1.5 2.0 2.5
SOURCE VOLTAGE (V)
3.0
3.5
V OH
(MEASURED)
V OH (MEASURED)
V
V OH (MEASURED)
V TRIP (HIGH)
Figure 56. Driver Type E Current (2.5V V DDEXT /V DDMEM )
V OL
V OL (MEASURED) +
V
V TRIP (LOW)
V OL (MEASURED)
(MEASURED)
20
V DDEXT = 1.9V @ – 40 °C
t DECAY
t TRIP
15
10
V DDEXT = 1.8V @ 25 °C
V DDEXT = 1.7V @ 105 °C
OUTPUT STOPS DRIVING
OUTPUT STARTS DRIVING
HIGH IMPEDANCE STATE
5
0
Figure 59. Output Enable/Disable
The time t ENA_MEASURED is the interval from when the reference
–5
–10
–15
–20
V OL
signal switches to when the output voltage reaches V TRIP (high)
or V TRIP (low). For V DDEXT /V DDMEM (nominal) = 1.8 V, V TRIP
(high) is 1.05 V, and V TRIP (low) is 0.75 V. For V DDEXT /V DDMEM
(nominal) = 2.5 V, V TRIP (high) is 1.5 V and V TRIP (low) is 1.0 V.
For V DDEXT /V DDMEM (nominal) = 3.3 V, V TRIP (high) is 1.9 V, and
V TRIP (low) is 1.4 V. Time t TRIP is the interval from when the out-
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
put starts driving to when the output reaches the V TRIP (high) or
SOURCE VOLTAGE (V)
Figure 57. Driver Type E Current (1.8V V DDEXT /V DDMEM )
Rev. D |
V TRIP (low) trip voltage.
Time t ENA is calculated as shown in the equation:
t ENA = t ENA_MEASURED – t TRIP
If multiple balls (such as the data bus) are enabled, the measure-
ment value is that of the first ball to start driving.
Page 75 of 88 | July 2013
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