
Philips Semiconductors
Product specification
SCN2681T
Dual asynchronous receiver/transmitter (DUART)
1998 Sep 04
6
ABSOLUTE MAXIMUM RATINGS
1
SYMBOL
T
A
Operating ambient temperature range
2
T
STG
Storage temperature range
All voltages with respect to GND
3
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 conditions 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.
PARAMETER
RATING
0 to +70
-65 to +150
-0.5 to +6.0
UNIT
°
C
°
C
V
DC ELECTRICAL CHARACTERISTICS
1, 2, 3
SYMBOL
PARAMETER
TEST CONDITIONS
LIMITS
Typ
UNIT
Min
Max
0.8
V
IL
V
IH
V
IH
V
OL
V
OH
I
IL
I
LL
I
X1L
Input low voltage
Input high voltage (except X1/CLK)
Input high voltage (X1/CLK)
2.0
3.5
V
Output low voltage
Output high voltage (except o.c. outputs)
4
I
OL
= 2.4mA
I
OH
= -400
μ
A
V
IN
= 0 to V
CC
V
O
= 0.4 to V
CC
V
IN
= 0, X2 grounded
V
IN
= 0, X2 floated
V
IN
= V
, X2 = grounded
V
IN
= V
CC
, X2 floated
V
IN
= 0, X1/CLK floated
V
IN
= V
CC
, X1/CLK floated
V
O
= 0.4 to V
CC
0.4
V
2.4
Input leakage current
Data bus 3-state leakage current
-10
-10
10
10
μ
A
X1/CLK low input current
-4
-3
-1
0
-100
0
-2
-1.5
0.2
3.5
-30
+30
0
0
1
10
0
100
mA
mA
mA
mA
μ
A
μ
A
μ
A
mA
I
X1H
X1/CLK high input current
I
X2L
I
X2H
I
OC
I
CC
X2 low input current
X2 high input current
Open-collector output leakage current
Power supply current
5
-10
10
150
NOTES:
1. Parameters are valid over specified temperature range. See Ordering information table for applicable operating temperature range and V
CC
supply range.
2. All voltage measurements are referenced to ground (GND). For testing, all inputs except X1/CLK swing between 0.4V and 2.4V with a
transition time of 20ns maximum. For X1/CLK this swing is between 0.4V and 4.0V. All time measurements are referenced at input voltages
of 0.8V and 2.0V and output voltages of 0.8V and 2.0V as appropriate.
3. Typical values are at +25
°
C, typical supply voltages, and typical processing parameters.
4. Test conditions for outputs: C
L
= 150pF, except interrupt outputs. Test conditions for interrupt outputs: C
L
= 50pF, R
L
= 2.7k
to V
CC
.
5. For bus operations, CEN and RDN (also CEN and WRN) are ANDed internally. As a consequence, the signal asserted last initiates the cycle
and the signal negated first terminates the cycle.
AC ELECTRICAL CHARACTERISTICS
1, 2, 3, 4
SD00028
RESET
t
RES
Figure 3. Reset Timing
NOTES:
1. Parameters are valid over specified temperature range. See Ordering information table for applicable operating temperature range and V
CC
supply range.
2. All voltage measurements are referenced to ground (GND). For testing, all inputs except X1/CLK swing between 0.4V and 2.4V with a
transition time of 20ns maximum. For X1/CLK this swing is between 0.4V and 4.0V. All time measurements are referenced at input voltages
of 0.8V and 2.0V and output voltages of 0.8V and 2.0V as appropriate.
3. Typical values are at +25
°
C, typical supply voltages, and typical processing parameters.
4. Test conditions for outputs: C
L
= 150pF, except interrupt outputs. Test conditions for interrupt outputs: C
L
= 50pF, R
L
= 2.7k
to V
CC
.