LTC1318
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Temperature
10.0
CHARGE PUMP OUTPUT VOLTAGE (V)
9.8
9.6
V
CC
= 5V
THRESHOLD VOLTAGE (V)
SUPPLY CURRENT (mA)
9.4
9.2
9.0
8.8
8.6
8.4
8.2
8.0
0
10
40
30
20
50
TEMPERATURE (°C)
60
70
RS422 Driver Differential Output
Swing vs Load Current
10
DIFFERENTIAL OUTPUT SWING (V)
9
8
7
6
5
4
3
2
1
0
0
SHORT-CIRCUIT CURRENT (mA)
DRIVER OUTPUT SWING (V)
T
A
= 25°C
V
CC
= 5V
I
LOAD
FROM
TXD
+
TO TXD
–
10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
1318 G04
RS232 Driver Slew Rate vs
Load Capacitance
25
T
A
= 25°C
V
CC
= 5V
SLEW RATE (V/µs)
SR
–
15
SR
+
DRIVER OUTPUT SWING (V)
20
6
4
2
0
–2
–4
–6
–8
NEGATIVE SWING
T
A
= 25°C
V
CC
= 5V
SHORT-CIRCUIT CURRENT (mA)
10
5
0
10
100
1000
CAPACITANCE (pF)
10000
1318 G07
4
U W
1318 G01
Charge Pump Output Voltage
vs Load Current
10
8
6
4
2
0
–2
–4
–6
–8
–10
0
3
9
12
6
LOAD CURRENT (mA)
15
1318 G02
TTL Input Threshold
vs Temperature
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0
10
20
30
40
50
60
70
TEMPERATURE (°C)
1318 G03
V
+
V
CC
= 5V
INPUT HIGH (TXI1, TXI2)
INPUT HIGH (TXD)
T
A
= 25°C
V
CC
= 5V
I
LOAD
= V
+
TO V
–
INPUT LOW (TXD)
INPUT LOW (TXI1, TXI2)
V
–
RS422 Driver Single-Ended
Output Swing vs Load Current
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
10
20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
1318 G05
RS422 Driver Short-Circuit
Current vs Temperature
100
98
96
94
92
90
88
86
84
82
80
0
10
40
30
20
50
TEMPERATURE (°C)
60
70
I
SC+
I
SC–
V
CC
= 5V
T
A
= 25°C
V
CC
= 5V
I
LOAD
FROM TXD
+
,
TXD
–
TO GND
1318 G06
RS232 Driver Output Swing vs
Resistive Load
10
8
POSITIVE SWING
20.0
19.5
19.0
18.5
18.0
17.5
17.0
16.5
16.0
15.5
15.0
RS232 Driver Short-Circuit
Current vs Temperature
V
CC
= 5V
I
SC–
I
SC+
–10
1
3
2
4 5 6 7 8 9 10
RESISTIVE LOAD (kΩ)
1318 G08
0
10
40
30
20
50
TEMPERATURE (°C)
60
70
1318 G09
LINER [ LINEAR TECHNOLOGY ]
