IBM39STB032xx
IBM39STB034xx
Preliminary
STB032xx and STB034xx Digital Set-Top Box Integrated Controllers
.
Absolute Maximum Ratings
Parameter
Maximum Rating
3.0 V
Supply voltage with respect to GND, 2.5 V supply
Supply voltage with respect to GND, 3.3 V supply
Case temperature under bias
3.9 V
TBD
Storage temperature
-65° C to 150° C
Operating Conditions
The STB03xxx Digital Set-Top Box Integrated Controller can interface to either 3.3 V or 5 V technologies. 5 V
interfaces are supported only for drivers/receivers supporting 5 V tolerance (see Drivers/Receivers). The
range for supply voltages is specified for five-percent margins relative to a nominal 2.5 V and 3.3 V power
supply.
Note: Device operation beyond the conditions specified in the table below is not recommended. Extended
operation beyond the recommended conditions may affect device reliability.
Recommended Operating Conditions
Symbol
Parameter
Min
Max
2.62
Unit
V
V
Supply Voltage, 2.5 V
Supply Voltage, 3.3 V
2.38
CC
V
3.14
3.47
V
C
CC330
T
Operating Free Air Temperature
0°
70°
A
Power Considerations
Power dissipation is determined by operating frequency, temperature, and supply voltage, as well as external
source/sink current requirements.
Power Sequencing
The 2.5 V power supply must maintain the following relationship whenever the 3.3 V power supply voltage is
greater than 0.4 V:
2.5 V power supply voltage >= 0.4 V
Supply excursions outside this range must be limited to less than 25 ms duration during each power-up or
power-down event.
General Recommendation
System designs that derive the 2.5 V supply from a regulator running from the 3.3 V supply are recommended
to ensure a fixed relationship between the two voltage supplies. Such usage substantially reduces the poten-
tial for the 3.3 V supply to be present without the 2.5 V supply.
Recommended Connections
Power and ground pins should all be connected to separate power and ground planes in the circuit board to
which the STB03xxx is mounted. Unused input pins must be tied inactive, either high or low.
STB03_sds_041800.fm.01
April 18, 2000
Electrical Information
Page 35 of 55
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