1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at V
CC
= 3.3V, +25°C ambient.
3. Per TTL driven input (control inputs only); A and B pins do not contribute to I
CC
.
Test Conditions
(1)
V
CC
= Max., V
IN
= GND or V
CC
V
CC
= Max., V
IN
= 3.0V
(3)
Min.
Typ
(2)
0.1
Max.
3
750
Units
μA
μA
PI3B3384 Switching Characteristics Over Operating Range
Parame te rs
De s cription
Conditions
(
1)
M in.
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation Delay
(2,3)
Ax to Bx, Bx to Ax
Bus Enable Time
BEx to Ax or Bx
Bus Disable Time
BEx to Ax or Bx
C
L
= 50pF
R
L
= 500
Ω
C
L
= 50pF
R
L
= 500
Ω
R
L
= 500
Ω
1. 0
1. 0
Com.
Units
M ax.
0.25
4.0
3 .5
ns
Notes:
1. See test circuit and waveforms.
2. This parameter is guaranteed but not tested on Propagation Delays.
3. The bus switch contributes no propagational delay other than the RC delay of the ON resistance of the switch and the load capacitance. The time
constant for the switch alone is of the order of 0.25ns for 50pF load. Since this time constant is much smaller than the rise/fall times of typical driving
signals, it adds very little propagational delay to the system. Propagational delay of the bus switch when used in a system is determined by the driving
circuit on the driving side of the switch and its interaction with the load on the driven side.
This article is based on LM3S9B96 ( CORTEX M3 ) and LM4F232H5QD ( CORTEX M4 ) as representatives. The parameters are derived from PDF . Some basic operating characteristics are compared.
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