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Power-Up Considerations
SN74AVC2T45
DUAL-BIT DUAL-SUPPLY BUS TRANSCEIVER
WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3-STATE OUTPUTS
SCES531J – DECEMBER 2003 – REVISED JUNE 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 1.2 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
9
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