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PDF SP3249 Data sheet ( Hoja de datos )
| Número de pieza | SP3249 | |
| Descripción | Intelligent +3.0V to +5.5V RS-232 Transceivers | |
| Fabricantes | Sipex | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SP3249 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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® SP3249E
Intelligent +3.0V to +5.5V RS-232 Transceivers
s Meets true EIA/TIA-232-F Standards
from a +3.0V to +5.5V power supply
s Interoperable with EIA/TIA-232 and
adheres to EIA/TIA-562 down to a +2.7V
power source
s Minimum 250Kbps data rate under load
s Regulated Charge Pump Yields Stable
RS-232 Outputs Regardless of V
CC
Variations
s Enhanced ESD Specifications:
+15KV Human Body Model
+15KV IEC1000-4-2 Air Discharge
+8KV IEC1000-4-2 Contact Discharge
DESCRIPTION
The SP3249E device is an RS-232 transceiver solution intended for portable or hand-held
applications such as notebook and palmtop computers. The SP3249E uses an internal
high-efficiency, charge-pump power supply that requires only 0.1µF capacitors in 3.3V
operation. This charge pump and Sipex's driver architecture allow the SP3249E device to
deliver compliant RS-232 performance from a single power supply ranging from +3.0V to
+5.0V. The SP3249E is a 5-driver/3-receiver device, ideal for laptop/notebook computer and
PDA applications.
SELECTION TABLE
Part
Number
Power
Supplies
SP3223E +3.0V to +5.5V
SP3243E +3.0V to +5.5V
SP3238E +3.0V to +5.5V
SP3239E +3.0V to +5.5V
SP3249E +3.0V to +5.5V
RS-232 RS-232
External
Drivers Receivers Components
2 2 4 capacitors
3 5 4 capacitors
5 3 4 capacitors
5 3 4 capacitors
5 3 4 capacitors
AUTO ON-LINE™
Circuitry
YES
YES
YES
NO
NO
TTL
3-State
Number
of Pins
YES
20
YES
28
YES
28
YES
28
NO 24
Applicable U.S. Patents - 5,306,954; and other patents pending.
Rev.4/08/02
SP3249E Intelligent +3.0V to +5.5V RS-232 Transceivers
1
© Copyright 2002 Sipex Corporation
1 page  
C2+ 1
GND 2
C2- 3
V- 4
T1OUT 5
T2OUT 6
T3OUT 7
R1IN 8
R2IN 9
T4OUT 10
R3IN 11
T5OUT 12
SP3249E
24 C1+
23 V+
22 VCC
21 C1-
20 T1IN
19 T2IN
18 T3IN
17 R1OUT
16 R2OUT
15 T4IN
14 R3OUT
13 T5IN
Figure 4. SP3249E Pinout Configuration
+
C5 0.1µF
24 C1+
+
C1 0.1µF
21 C1-
+
C2 0.1µF
1 C2+
3 C2-
TTL/CMOS
INPUTS
20 T1IN
19 T2IN
18 T3IN
15 T4IN
13 T5IN
22
VCC
VCC
V+ 23
+
C3 0.1µF
SP3249E V- 4
T1OUT 5
T2OUT 6
T3OUT 7
T4OUT 10
T5OUT 12
C4 0.1µF
+
RS-232
OUTPUTS
TTL/CMOS
OUTPUTS
17 R1OUT
16 R2OUT
14 R3OUT
R1IN 8
5kΩ
R2IN 9
5kΩ
R3IN 11
5kΩ
RS-232
INPUTS
GND
2
Figure 5. SP3249E Typical Operating Circuit
Rev.4/08/02
SP3249E Intelligent +3.0V to +5.5V RS-232 Transceivers
5
© Copyright 2002 Sipex Corporation
5 Page 
RCC
DC Power
Source
SW1
Contact-Discharge Module
RSS RV
SW2
CSS
Device
Under
Test
Figure 17. ESD Test Circuit for IEC1000-4-2
The circuit model in Figures 16 and 17 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
1.5kW an 100pF, respectively. For IEC-1000-4-
2, the current limiting resistor (RS) and the source
capacitor (CS) are 330W an 150pF, respectively.
The higher CS value and lower RS value in the
IEC1000-4-2 model are more stringent than the
Human Body Model. The larger storage capacitor
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.
RS and RV add up to 330Ω for IEC1000-4-2.
30A
15A
0A
t=0ns
t=30ns
t➙
Figure 18. ESD Test Waveform for IEC1000-4-2
DEVICE PIN
TESTED
HUMAN BODY
IEC1000-4-2
MODEL
Air Discharge Direct Contact
Driver Outputs
Receiver Inputs
±15kV
±15kV
±15kV
±15kV
±8kV
±8kV
Table 2. Transceiver ESD Tolerance Levels
Level
4
4
Rev.4/08/02
SP3249E Intelligent +3.0V to +5.5V RS-232 Transceivers
11
© Copyright 2002 Sipex Corporation
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet SP3249.PDF ] | |
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