Datasheet

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Operating Characteristics
POWER-UP CONSIDERATIONS
SN74AVCH2T45
DUAL-BIT DUAL-SUPPLY BUS TRANSCEIVER
WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3-STATE OUTPUTS
SCES582F – JULY 2004 – REVISED NOVEMBER 2007
T
A
= 25 ° C
V
CCA
= V
CCA
= V
CCA
= V
CCA
= V
CCA
=
TEST
V
CCB
= 1.2 V V
CCB
= 1.5 V V
CCB
= 1.8 V V
CCB
= 2.5 V V
CCB
= 3.3 V
PARAMETER UNIT
CONDITIONS
TYP TYP TYP TYP TYP
A-port input,
3 3 3 3 4
C
L
= 0,
B-port output
C
pdA
(1)
f = 10 MHz, pF
B-port input,
t
r
= t
f
= 1 ns
13 13 14 15 15
A-port output
A-port input,
13 13 14 15 15
C
L
= 0,
B-port output
C
pdB
(1)
f = 10 MHz, pF
B-port input,
t
r
= t
f
= 1 ns
3 3 3 3 4
A-port output
(1) Power dissipation capacitance per transceiver
A proper power-up sequence always should be followed to avoid excessive supply current, bus contention,
oscillations, or other anomalies. To guard against such power-up problems, take the following precautions:
1. Connect ground before any supply voltage is applied.
2. Power up V
CCA
.
3. V
CCB
can be ramped up along with or after V
CCA
.
Table 1. Typical Total Static Power Consumption (I
CCA
+ I
CCB
)
V
CCA
V
CCB
UNIT
0 V 1.2 V 1.5 V 1.8 V 2.5 V 3.3 V
0 V 0 <0.5 <0.5 <0.5 <0.5 <0.5
1.2 V <0.5 <1 <1 <1 <1 1
1.5 V <0.5 <1 <1 <1 <1 1
µ A
1.8 V <0.5 <1 <1 <1 <1 <1
2.5 V <0.5 1 <1 <1 <1 <1
3.3 V <0.5 1 <1 <1 <1 <1
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