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Philips Semiconductors
3.3 V or 5.0 V Universal Asynchronous
Receiver/Transmitter (UART)
DC ELECTRICAL CHARACTERISTICS
V
= 3.3 V
10 %, T
= –40 C to +85 C, unless otherwise specified.
CC
amb
Symbol
Parameter
V
Input low voltage
IL
V
Input high voltage
IH
V
Output low voltage
OL
V
Output high voltage (except OD outputs)
OH
I
X1/CLK input current - power down
IX1PD
I
X1/CLK input low current - operating
ILX1
I
X1/CLK input high current - operating
IHX1
Input leakage current:
All except input port pins
I
I
5
Input port pins
I
Output off current high, 3-State data bus
OZH
I
Output off current low, 3-State data bus
OZL
I
Open-drain output low current in off-state
ODL
I
Open-drain output high current in off-state
ODH
Power supply current
Operating mode
I
CC
Power down mode
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 0.8*V
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: C
L
constant current source = 2.6 mA.
5. Input port pins have active pull-up transistors that will source a typical 2 A from V
Input port pins at V
source 0.0 A.
CC
6. All outputs are disconnected. Inputs are switching between CMOS levels of V
2004 Oct 21
1, 2, 3
Conditions
I
4
I
V
V
V
V
V
V
V
V
V
6
CMOS input levels
CMOS input levels
= 125 pF, except open drain outputs. Test conditions for open drain outputs: C
Min
0.8*V
= 2.4 mA
OL
V
= –400 A
OH
–0.5
= 0 V to V
IN
CC
= 0 V
–80
IN
= V
0
IN
CC
= 0 V to V
–0.5
IN
CC
= 0 V to V
–8
IN
CC
= V
IN
CC
= 0 V
–0.5
IN
= 0 V
–0.5
IN
= V
IN
CC
. All time measurements are referenced at input voltages of 0.8 V and
CC
when the input pins are at V
CC
– 0.2 V and V
CC
SS
11
Product data sheet
SC28L91
Typ
Max
0.65
0.2*V
CC
1.7
CC
0.2
0.4
– 0.5
V
– 0.2
CC
CC
0.05
+0.5
0
80
0.05
+0.5
0.5
+0.5
0.5
0.5
5
1
5.0
= 125 pF,
L
.
SS
+ 0.2 V.
Unit
V
V
V
V
A
A
A
A
A
A
A
A
A
mA
A
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