ISL4238E Intersil Corporation, ISL4238E Datasheet - Page 15

• Manufacturer Part Number: ISL4238E
• Description: QFN Packaged, 15kV Esd Protected, +2.7V to +5.5V, 10Nanoamp, 250kbps/ 1Mbps, RS-232 Transceivers With Enhanced Automatic Powerdown
• Manufacturer: Intersil Corporation

AIR-GAP DISCHARGE TEST METHOD
For this test method, a charged probe tip moves toward the
IC pin until the voltage arcs to it. The current waveform
delivered to the IC pin depends on approach speed,
humidity, temperature, etc., so it is difficult to obtain
repeatable results. The “E” device RS-232 pins withstand
±15kV air-gap discharges.
Typical Performance Curves
FIGURE 17. ISL4238E TRANSMITTER OUTPUT VOLTAGE vs
FIGURE 19. ISL4245E TRANSMITTER OUTPUT VOLTAGE vs
-2
-4
-6
-2
-4
-6
6
4
2
0
6
4
2
0
0
0
1 TRANSMITTER AT 250kbps
OTHER TRANSMITTERS AT 30kbps
1 TRANSMITTER AT 1Mbps
OTHER TRANSMITTERS AT 30kbps
LOAD CAPACITANCE
LOAD CAPACITANCE
1000
1000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
2000
2000
15
3000
3000
V
ISL4238E, ISL4244E, ISL4245E
CC
V
V
V
V
OUT
OUT
4000
OUT
OUT
4000
= 3.3V, T
+
+
-
-
5000
5000
A
= 25
o
C
CONTACT DISCHARGE TEST METHOD
During the contact discharge test, the probe contacts the
tested pin before the probe tip is energized, thereby
eliminating the variables associated with the air-gap
discharge. The result is a more repeatable and predictable
test, but equipment limits prevent testing devices at voltages
higher than ±8kV. All “E” family devices survive ±8kV contact
discharges on the RS-232 pins.
FIGURE 18. ISL4244E TRANSMITTER OUTPUT VOLTAGE vs
FIGURE 20. ISL4238E SUPPLY CURRENT vs LOAD
55
50
45
40
35
30
25
20
-2
-4
-6
6
4
2
0
0
0
1 TRANSMITTER AT 250kbps
OTHER TRANSMITTERS AT 30kbps
1 TRANSMITTER AT INDICATED RATE
LOAD CAPACITANCE
CAPACITANCE WHEN TRANSMITTING DATA
1000
1000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
2000
2000
3000
3000
250kbps
20kbps
120kbps
V
V
4000
4000
OUT
OUT
+
-
5000
5000