Datasheet

 
 
SPRS161K − MARCH 2001 − REVISED JULY 2007
62
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
PARAMETER MEASUREMENT INFORMATION
Tester Pin
Electronics
V
LOAD
I
OL
C
T
I
OH
Output
Under
Test
50 Ω
Where: I
OH
= −2 mA (all outputs)
V
LOAD
= 1.5 V
C
T
= 50-pF typical load-circuit capacitance
Figure 23. Test Load Circuit
signal transition levels
The data in this section is shown for the 3.3-V version. Note that some of the signals use different reference
voltages, see the recommended operating conditions table. Output levels are driven to a minimum logic-high
level of 2.4 V and to a maximum logic-low level of 0.4 V.
Figure 24 shows output levels.
0.4 V (V
OL
)
20%
2.4 V (V
OH
)
80%
Figure 24. Output Levels
Output transition times are specified as follows:
D For a high-to-low transition, the level at which the output is said to be no longer high is below 80% of the
total voltage range and lower and the level at which the output is said to be low is 20% of the total voltage
range and lower.
D For a low-to-high transition, the level at which the output is said to be no longer low is 20% of the total voltage
range and higher and the level at which the output is said to be high is 80% of the total voltage range and
higher.
Figure 25 shows the input levels.
0.8 V (V
IL
)
10%
2.0 V (V
IH
)
90%
Figure 25. Input Levels
Input transition times are specified as follows:
D For a high-to-low transition on an input signal, the level at which the input is said to be no longer high is 90%
of the total voltage range and lower and the level at which the input is said to be low is 10% of the total voltage
range and lower.
D For a low-to-high transition on an input signal, the level at which the input is said to be no longer low is 10%
of the total voltage range and higher and the level at which the input is said to be high is 90% of the total
voltage range and higher.