SP3249 Ver la hoja de datos (PDF) - Signal Processing Technologies
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Fabricante
SP3249 Datasheet PDF : 14 Pages
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SPECIFICATIONS
V
CC
=
+3.0
to
+5.5,
C1
-C4
=
0.1µF
(tested
at
3.3V
+
5%),
C1-C4
=
0.22µF
(tested
at
3.3V
+
10%),
C1
=
0.047µF,
and
C2-C4
=
0.33µF
(tested
at
5.0V
+ 10%), T = T to T , unless otherwise noted.
A
MIN
MAX
Typical
values
are
at
T
A
=
+25°C.)
PARAMETER
TIMING CHARACTERISTICS
Maximum Data Rate
Receiver Propagation Delay
tPHL
tPLH
Receiver Output Enable Time
Receiver Output Disable Time
Driver Skew
Receiver Skew
Transition-Region Slew Rate
MIN.
250
TYP.
MAX. UNITS CONDITIONS
kbps RL = 3kΩ, CL = 1000pF, one
driver switching
0.15
µs Receiver input to receiver
output, CL = 150pF
0.15
µs Receiver input to receiver
output, CL = 150pF
200
ns Normal operation
200
ns Normal operation
100
ns I tPLH - tPLH I,TA = 25°C
50
ns
I tPLH - tPLH I
30
V/µs VCC = 3.3V, RL = 3kΩ,
TAMB =25°C, measurements
taken from -3.0V to +3.0V or
+3.0V to -3.0V
TYPICAL PERFORMANCE CHARACTERISTICS
Unless otherwise noted, the following performance characteristics apply for VCC = +3.3V, 250kbps data rate, all drivers loaded with 3kΩ, 0.1µF charge
pump capacitors, and TAMB = +25°C.
TRANSMITTER OUTPUT vs. LOAD CAPACITANCE
SLEW RATE vs. LOAD CAPACITANCE
6
4
2
VOH
0
VOL
-2 0
1000
2000
3000
4000
5000
-4
-6
pF
25
20
15
10
5
0
0
1000
2000
3000
pF
4000
5000
POS. SR
NEG SR
Figure 1. Transmitter Output vs. Load Capacitance
Figure 2. Slew Rate vs. Load Capacitance
60
50
40
30
20
10
0
0
SUPPLY CURRENT vs LOAD CAPACITANCE
1000
2000
3000
pF
4000
5000
250Kbps
120Kbps
20Kbps
Figure 3. Supply Current vs. Load Capacitance when
Transmitting Data
Rev.4/08/02
SP3249E Intelligent +3.0V to +5.5V RS-232 Transceivers
3
© Copyright 2002 Sipex Corporation
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