Philips Semiconductors Product data sheet
SC28L91
3.3 V or 5.0 V Universal Asynchronous
Receiver/Transmitter (UART)
2004 Oct 21 10
ABSOLUTE MAXIMUM RATINGS1
Symbol Parameter Rating Unit
Tamb Operating ambient temperature range2Note 4 °C
Tstg Storage temperature range –65 to +150 °C
VCC Voltage from VCC to GND3–0.5 to +7.0 V
VSVoltage from any pin to GND3–0.5 to VCC +0.5 V
PDPackage power dissipation (PLCC44) 2.4 W
PDPackage power dissipation (PQFP44) 1.78 W
Derating factor above 25 °C (PLCC44) 19 mW/°C
Derating factor above 25 °C (PQFP44) 14 mW/°C
NOTES:
1. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and
functional operation of the device at these or any other condition above those indicated in the operation section of this specification is not
implied.
2. For operating at elevated temperatures, the device must be derated based on +150°C maximum junction temperature.
3. This product includes circuitry specifically designed for the protection of its internal devices from damaging effects of excessive static
charge. Nonetheless, it is suggested that conventional precautions be taken to avoid applying any voltages larger than the rated maxima.
4. Parameters are valid over specified temperature and voltage range.
DC ELECTRICAL CHARACTERISTICS1, 2, 3
VCC = 5 V ± 10 %, Tamb = –40 °C to +85 °C, unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
VIL Input low voltage 0.8 V
VIH Input high voltage (except X1/CLK) 2.4 1.5 V
VIH Input high voltage (X1/CLK) 0.8VCC 2.4 V
VOL Output low voltage IOL = 2.4 mA 0.2 0.4 V
VOH Output high voltage (except OD outputs)4IOH = –400 µAVCC – 0.5 V
IIX1PD X1/CLK input current - power down VIN = 0 V to VCC 0.5 0.05 0.5 µA
IILX1 X1/CLK input low current - operating VIN = 0 V –130 0µA
IIHX1 X1/CLK input high current - operating VIN = VCC 0 130 µA
Input leakage current:
IIAll except input port pins VIN = 0 V to VCC –0.5 0.05 +0.5 µA
Input port pins5VIN = 0 V to VCC –8 0.05 +0.5 µA
IOZH Output off current high, 3-State data bus VIN = VCC 0.5 µA
IOZL Output off current low, 3-State data bus VIN = 0 V –0.5 µA
IODL Open-drain output low current in off-state VIN = 0 V –0.5 µA
IODH Open-drain output high current in off-state VIN = VCC 0.5 µA
Power supply current6
ICC Operating mode CMOS input levels 7 25 mA
Power down mode CMOS input levels ≤1 5 mA
NOTES:
1. Parameters are valid over specified temperature and voltage range.
2. All voltage measurements are referenced to ground (GND). For testing, all inputs swing between 0.4 V and 3.0 V with a transition time of
5 ns maximum. For X1/CLK, this swing is between 0.4 V and 0.8VCC. All time measurements are referenced at input voltages of 0.8 V and
2.0 V and output voltages of 0.8 V and 2.0 V, as appropriate.
3. Typical values are at +25 °C, typical supply voltages, and typical processing parameters.
4. Test conditions for outputs: CL = 125 pF, except open drain outputs. Test conditions for open drain outputs: CL = 125 pF,
constant current source = 2.6 mA.
5. Input port pins have active pull-up transistors that will source a typical 2 µA from VCC when the input pins are at VSS.
Input port pins at VCC source 0.0 µA.
6. All outputs are disconnected. Inputs are switching between CMOS levels of VCC – 0.2 V and VSS + 0.2 V.