Datasheet
7–180
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
†
PARAMETER TEST CONDITIONS MIN MAX UNIT
‡
ABT, AHCT V
CC
= 5.5 V, One input at 3.4 V, Other inputs at V
CC
or GND 1.5
∆I
CC
‡
CBT
Control inputs
V
CC
= 5.5 V, One input at 3.4 V, Other inputs at V
CC
or GND 2.5
mA
∆I
‡
CBTLV
V
CC
=36V
One in
p
ut at 3 V
Other in
p
uts at V
CC
or GND
750
µA
∆I
CC
‡
Control inputs
V
CC
=
3
.
6
V
,
One
inp
u
t
at
3
V
,
Other
inp
u
ts
at
V
CC
or
GND
750
µ
A
∆I
CC
‡
LVT
V
CC
=3Vto36V
One in
p
ut at V
CC
06V
Other in
p
uts at V
CC
or GND
0.2
mA
∆I
CC
‡
LVC, ALVC, LV
V
CC
=
3
V
to
3
.
6
V
,
One
inp
u
t
at
V
CC
–
0
.
6
V
,
Other
inp
u
ts
at
V
CC
or
GND
0.5
mA
†
Refer to the latest TI data sheets for device specifications.
‡
This is the increase in supply current for each input that is at the specified TTL voltage level rather than V
CC
or GND.
Figure 5. Examples of Supply-Current Change of the Input at TTL Level as Specified in Data Sheets
– Supply Current – mA
CC
I
V
I
– Input Voltage – V
80
60
20
0
0 0.5 1 1.5 2 2.5 3
100
140
160
3.5 4 4.5 5
40
120
5.5 6
V
CC
= 5 V
T
A
= 25°C
All 36 Bits Are Driven
From 0 V to 6 V
Figure 6. Supply Current Versus Input Voltage (36 Inputs)
As long as the driver is active in a transmission path or bus, the receiver’s input is always in a valid state. No input specification
is violated as long as the rise and fall times are within the data-sheet limits. However, when the driver is in a high-impedance
state, the receiver input is no longer at a defined level and tends to float. This situation can worsen when several transceivers
share the same bus. Figure 7 is an example of a typical bus system. When all transceivers are inactive, the bus-line levels are
undefined. When a voltage that is determined by the leakage currents of each component on the bus is reached, the condition
is known as a floating state. The result is a considerable increase in power consumption and a risk of damaging all components
on the bus. Holding the inputs or I/O pins at a valid logic level when they are not being used or when the part driving them
is in the high-impedance state is recommended.
Figure 7. Typical Bidirectional Bus