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Power-Up Considerations
SN74LVC2T45
DUAL-BIT DUAL-SUPPLY BUS TRANSCEIVER
WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3-STATE OUTPUTS
SCES516I – DECEMBER 2003 – REVISED MARCH 2007
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 1.8 V 2.5 V 3.3 V 5 V
0 V 0 <1 <1 <1 <1
1.8 V <1 <2 <2 <2 2
2.5 V <1 <2 <2 <2 <2 µ A
3.3 V <1 <2 <2 <2 <2
5 V <1 2 <2 <2 <2
9
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