TYPICAL PERFORMANCE CHARACTERISTICS
Unless otherwise noted, the following performance characteristics apply for V
CC
= +3.3V, 1000kbps data rate, all
drivers loaded with 3kΩ, 0.1µF charge pump capacitors, and T
AMB
= +25°C.
200
150
Skew (ns)
100
50
0
T1 at 500Kbps
T2 at 31.2Kbps
All TX loaded 3K // CLoad
6
4
Transmitter Output
Voltage (V)
2
0
-2
-4
-6
2.7
3
3.5
4
Supply V oltage (V)
4.5
5
1Driver at 1Mbps
Other Drivers at 62.5Kbps
All Drive rs Loaded with 3K // 250pF
0
250
500
1000
1500
Load Capacitance (pF)
2000
Figure 1. Transmitter Skew VS. Load Capacitance
Figure 2. Transmitter Output Voltage VS. Supply
Voltage for the SP3243EU
6
Transmitter
Output V oltage (V)
40
2Mbps
1.5Mbps
4
2
0
-2
-4
-6
0
35
Supply Current (mA)
1Mbps
30
25
20
15
10
5
0
0
1000
250Kbps
120Kbps
20Kbps
1 TX at full data rate
2 TX’s at1/16 data rate
2Mbps
1.5Mbps
1Mbps
1 Transmi tter at full Data Rate
2 Transmi tters at 1 5.5 Kbps
All Transmi tters loa des 3K + Load Cap
250
500
1000
1500
Load Capacitance (pF)
2000
2000
3000
4000
5000
Load Capacitance (pF)
Figure 3. Transmitter Output Voltage VS. Load
Capacitance for the SP3243EU
Figure 4. Supply Current VS. Load Capacitance for
the SP3243EU
25
20
Supply Current (mA)
6
4
Transmitter Output
Voltage (V)
TxOUT +
15
10
5
0
2
0
-2
-4
-6
0
TxOUT -
1 Transmitter at 250Kbps
2 Transmitters at 15.6Kbps
All drivers loaded with 3K // 1000pF
2.7
3
3.5
4
4.5
5
1000
2000
3000
4000
5000
Supply V oltage (V
DC
)
Load Capacitance (pF)
Figure 5. Supply Current VS. Supply Voltage for the
SP3243EU
Figure 6. Transmitter Output Voltage VS. Load
Capacitance for the SP3243EB
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP3243E_100_072309
4
EXAR [ EXAR CORPORATION ]
