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PDF SP385E Data sheet ( Hoja de datos )
| Número de pieza | SP385E | |
| Descripción | Enhanced +3V or +5V RS-232 Line Driver/Receiver | |
| Fabricantes | Exar | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SP385E (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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SP385E
Enhanced +3V or +5V RS-232 Line Driver/Receiver
FEATURES
■ Operates from 3.3V or 5V Power Supply
■ Meets all EIA-232D and V.28 Specifica-
tions at 5V.
■ Meets EIA-562 Specifications at 3.3V
■ Two Drivers and Receivers
■ Operates with 0.1µF to 10µF Capacitors
■ High data rate - 120kbps Under Load
■ Low Power Shutdown ≤ 1µA
■ 3-State TTL/CMOS Receiver Outputs
■ Low Power CMOS - 5mA Operation
■ Improved ESD Specifications:
+15kV Human Body Model
+15kV IEC61000-4-2 Air Discharge
+8kV IEC61000-4-2 Contact Discharge
N/C 1
C1+ 2
V+ 3
C1- 4
C2+ 5
C2- 6
V- 7
T2OUT 8
R2IN 9
18 ON/OFF
17 VCC
16 GND
15 T1 OUT
14 R1 IN
13 R1 OUT
12 T1 IN
11 T 2 IN
10 R 2 OUT
Now Available in Lead Free Packaging
DESCRIPTION
Exar's SP385E is an enhanced version of the SP200 family of RS-232 line drivers/receivers. The
SP385E offers +3.3V operation for EIA-562 and EIA-232 applications. The SP385E features offered
maintains the same performance features offered in its predecessors. The SP385E is available in
plastic SOIC or SSOP packages operating over the commercial and industrial temperature ranges.
The SP385E is pin compatible to the LTC1385 EIA-562 transceiver with the exception that the drivers
are disabled with the ON/OFF pin.
Typical Application Circuit
RS232 OUTPUTS
RS232 INPUTS
Charge
Pump
T1 T2
R1 R2
TTL/CMOS INPUTS
TTL/CMOS OUTPUTS
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP385E_100_030811
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
-11
-10
-9
-8
-7
-6
-5
-4
-3
0
VCC = 4V
VCC = 5V
2 4 6 8 10 12 14
Load Current (mA)
30
25
20
VCC = 5V
15
10 VCC = 4V
5 VCC = 3V
0
-55 -40 0 25 70 85 125
Temperature ( C)
N/C 1
C1+ 2
V+ 3
C1- 4
C2+ 5
C2- 6
V- 7
T2 OUT 8
R2 IN 9
18 ON/OFF
17 VCC
16 GND
15 T1 OUT
14 R 1 IN
13 R 1 OUT
12 T1 IN
11 T 2 IN
10 R 2 OUT
18-pin WSOIC
12
10
8 VCC = 5V
6
VCC = 4V
4
2
0
0 5 10 15 20 25 30 35 40
Load Current (mA)
8.4
8.2
8.0
7.8
7.6
7.4
7.2
7.0
6.8
4.5
Load current = 0mA
TA = 25 C
4.75
5.0
VCC (Volts)
5.25
5.5
PINOUT
N/C 1
C1+ 2
V+ 3
C1- 4
C2+ 5
C2- 6
V- 7
T2OUT 8
R 2 IN 9
N/C 10
20 ON/OFF
19 VCC
18 GND
17 T1 OUT
16 R 1 IN
15 R 1 OUT
14 T1 IN
13 T2 IN
12 R2OUT
11 N/C
20-pin SSOP
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP385E_100_030811
5 Page 
RC
DC Power
Source
SW1
Contact-Discharge Model
RS RV
SW2
CS
Device
Under
Test
RS and RV add up to 330Ω for IEC61000-4-2.
Figure 7. ESD Test Circuit for IEC61000-4-2
The circuit models in Figures 6 and 7 represent
the typical ESD testing circuit used for all three
methods. The CS is initially charged with the DC
power supply when the first switch (SW1) is on.
Now that the capacitor is charged, the second
switch (SW2) is on while SW1 switches off. The
voltage stored in the capacitor is then applied
through RS, the current limiting resistor, onto the
device under test (DUT). In ESD tests, the SW2
switch is pulsed so that the device under test
receives a duration of voltage.
For the Human Body Model, the current limiting
resistor (RS) and the source capacitor (CS) are
1.5kΩ an 100pF, respectively. For IEC-61000-4-2,
the current limiting resistor (RS) and the source ca-
pacitor (CS) are 330Ω an 150pF, respectively.
The higher CS value and lower RS value in the
IEC61000-4-2 model are more stringent than the
Human Body Model. The larger storage capaci-
tor injects a higher voltage to the test point when
SW2 is switched on. The lower current limiting
resistor increases the current charge onto the
test point.
30A
15A
0A
t = 0ns
t = 30ns
t→
Figure 8. ESD Test Waveform for IEC61000-4-2
Device PIN Human Body
IEC61000-4-2
TESTED
MODEL
Air Discharge Direct Contact
Driver Outputs
Receiver Inputs
+15kV
+15kV
+15kV
+15kV
+8kV
+8kV
Table 1. Transceiver ESD Tolerance Levels
Level
4
4
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
11
SP385E_100_030811
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet SP385E.PDF ] | |
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