Datasheet

7–186
Figure 14. Driver and Receiver System
105 110 115 120 125 130
2
3
135 140
Time – ns
1
Driver Switching From High to Low Driver Switching From Low to High
V
CC
= 3.3 V
T
A
= 25°C
Time – ns
V
0
2
3
1
0
10 20 30 40 50 60 70 80
V
CC
= 3.3 V
T
A
= 25°C
Bus Hold Switched
Bus Hold Switched
Receivers:
With Bus Hold
Without Bus Hold
Receivers:
With Bus Hold
Without Bus Hold
O
– Output Voltage – V
V
O
– Output Voltage – V
Figure 15. Output Waveforms of Driver With and Without Receiver Bus-Hold Circuit
Figure 16 shows the supply current (I
CC
) of the bus-hold circuit as the input is swept from 0 to 5 V. The spike at about 1.5-V
V
I
is due to both the n-channel and the p-channel conducting simultaneously. This is one of the CMOS
transistor characteristics.
3
2
1
0
01 23
4
5
45
V
I
– Input Voltage – V
I – Supply Current – mA
CC
V
CC
= 5 V
0.5 1.5 2.5 3.5 4.5 5.5
Figure 16. Bus-Hold Circuit Supply Current Versus Input Voltage