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PDF SP3238E Data sheet ( Hoja de datos )
| Número de pieza | SP3238E | |
| 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 SP3238E (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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SIGNAL PROCESSING EXCELLENCE
SP3238E
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 Auto-Online™ circuitry automatically
wakes up from a 1µA shutdown
s Minimum 250Kbps data rate under load
s Regulated Charge Pump Yields Stable
RS-232 Outputs Regardless of VCC
Variations
s Enhanced ESD Specifications:
+15KV Human Body Model
+15KV IEC1000-4-2 Air Discharge
+8KV IEC1000-4-2 Contact Discharge
DESCRIPTION
The SP3238E device is an RS-232 transceiver solution intended for portable or hand-held
applications such as notebook and palmtop computers. The SP3238E 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 SP3238E device to
deliver compliant RS-232 performance from a single power supply ranging from +3.0V to
+5.0V. The SP3238E is a 5-driver/3-receiver device, ideal for laptop/notebook computer and
PDA applications. The SP3238E includes one complementary receiver that remains alert to
monitor an external device's Ring Indicate signal while the device is shutdown.
The Auto-Online feature allows the device to automatically "wake-up" during a shutdown
state when an RS-232 cable is connected and a connected peripheral is turned on. Otherwise,
the device automatically shuts itself down drawing less than 1µA.
SELECTION TABLE
Device Power Supplies RS-232 RS-232
Drivers Receivers
SP3221E +3.0V to +5.5V
1
1
External
Components
4 capacitors
Auto-Online TTL 3-State
Circuitry
YES
YES
No. of
Pins
16
SP3223E +3.0V to +5.5V
2
2
4 capacitors
YES
YES
20
SP3243E +3.0V to +5.5V
3
5
4 capacitors
YES
YES
28
SP3238E +3.0V to +5.5V
5
3
4 capacitors
YES
YES
28
Applicable U.S. Patents - 5,306,954; and other patents pending.
SP3238EDS/04
SP3238E +3.0V to +5.5V RS-232 Transceivers
1
© Copyright 1999 Sipex Corporation
1 page  
NAME
FUNCTION
C2+ Positive terminal of the inverting charge-pump capacitor.
GND
Ground.
C2- Negative terminal of the inverting charge-pump capacitor.
V- Regulated -5.5V output generated by the charge pump.
T1OUT
T2OUT
T3OUT
R1IN
R2IN
T4OUT
R3IN
T5OUT
ONLINE
RS-232 driver output.
RS-232 driver output.
RS-232 driver output.
RS-232 receiver input.
RS-232 receiver input.
RS-232 driver output.
RS-232 receiver input.
RS-232 driver output.
Apply logic HIGH to override Auto-Online circuitry keeping drivers active
(SHUTDOWN must also be logic HIGH, refer to Table 2).
SHUTDOWN
Apply logic LOW to shut down drivers and charge pump. This overrides all Auto-
Online circuitry and ONLINE (refer to Table 2).
STATUS TTL/CMOS Output indicating online and shutdown status.
R1OUT
T5IN
R3OUT
T4IN
R2OUT
R1OUT
T3IN
T2IN
T IN
1
C1-
Non-inverting receiver-1 output, active in shutdown.
TTL/CMOS driver input.
TTL/CMOS receiver output.
TTL/CMOS driver input.
TTL/CMOS receiver output.
TTL/CMOS receiver output.
TTL/CMOS driver input.
TTL/CMOS driver input.
TTL/CMOS driver input.
Negative terminal of the voltage doubler charge-pump capacitor.
VCC +3.0V to +5.5V supply voltage.
V+ Regulated +5.5V output generated by the charge pump.
C1+ Positive terminal of the voltage doubler charge-pump capacitor.
Table 1. Device Pin Description
PIN
NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
SP3238EDS/04
SP3238E +3.0V to +5.5V RS-232 Transceivers
5
© Copyright 1999 Sipex Corporation
5 Page 
RECEIVER +2.7V
RS-232 INPUT 0V
VOLTAGES -2.7V
VCC
STATUS
0V
+5V
DRIVER
RS-232 OUTPUT 0V
VOLTAGES
-5V
Figure 10. Auto-Online Timing Waveforms
S
H
U
T
D
O
W
N
tSTSL
tSTSH
tONLINE
VCC = +5V
+
C1 –
–5V
+5V
+
C2 –
–5V
Figure 11. Charge Pump — Phase 1
C4
+ – VDD Storage Capacitor
– + VSS Storage Capacitor
C3
VCC = +5V
+
C1 –
Figure 12. Charge Pump — Phase 2
+
C2 –
–10V
C4
+ – VDD Storage Capacitor
– + VSS Storage Capacitor
C3
SP3238EDS/04
SP3238E +3.0V to +5.5V RS-232 Transceivers
11
© Copyright 1999 Sipex Corporation
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet SP3238E.PDF ] | |
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