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PDF SP3238 Data sheet ( Hoja de datos )
| Número de pieza | SP3238 | |
| Descripción | Intelligent 3.0V to 5.5V RS-232 Transceiver | |
| Fabricantes | Sipex Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SP3238 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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®
SP3238
Intelligent +3.0V to +5.5V RS-232 Transceiver
FEATURES
■ Meets true EIA/TIA-232-F Standards
from a +3.0V to +5.5V power supply
■ Interoperable with EIA/TIA-232 and
adheres to EIA/TIA-562 down to a +2.7V
power source
■ AUTO ON-LINE® circuitry automatically
wakes up from a 1µA shutdown
■ Minimum 250Kbps data rate under load
■ Regulated Charge Pump Yields Stable
RS-232 Outputs Regardless of VCC
Variations
■ ESD Specifications:
+2kV Human Body Model
C2+ 1
GND 2
C2- 3
V- 4
T1OUT 5
T2OUT 6
T3OUT 7
R1IN 8
R2IN 9
T4OUT 10
R3IN 11
T5OUT 12
ONLINE 13
SHUTDOWN 14
SP3238
28 C1+
27 V+
26 VCC
25 C1-
24 T1IN
23 T2IN
22 T3IN
21 R1OUT
20 R2OUT
19 T4IN
18 R3OUT
17 T5IN
16 R1OUT
15 STATUS
Now Available in Lead Free Packaging
DESCRIPTION
The SP3238 device is an RS-232 transceiver solution intended for portable or hand-held
applications such as notebook and palmtop computers. The SP3238 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 SP3238 device to
deliver compliant RS-232 performance from a single power supply ranging from +3.0V to
+5.0V. The SP3238 is a 5-driver/3-receiver device, ideal for laptop/notebook computer and
PDA applications. The SP3238 includes one complementary receiver that remains alert to
monitor an external device's Ring Indicate signal while the device is shutdown.
The AUTO ON-LINE® 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
External
AUTO ON-LINE®
Drivers Receivers Components
Circuitry
SP3220 +3.0V to +5.5V
1
1 4 capacitors
NO
SP3223 +3.0V to +5.5V
2
2 4 capacitors
YES
SP3243 +3.0V to +5.5V
3
5 4 capacitors
YES
SP3238 +3.0V to +5.5V
5
3 4 capacitors
YES
TTL 3-State
YES
YES
YES
YES
No. of
Pins
16
20
28
28
Applicable U.S. Patents - 5,306,954; and other patents pending.
Rev. 6/30/03
SP3238 Intelligent +3.0V to +5.5V RS-232 Transceiver
1
© Copyright 2003 Sipex Corporation
1 page  
www.DataSheet4U.net
PIN DESCRIPTION
NAME
FUNCTION
PIN
NO.
C2+ Positive terminal of the symmetrical charge-pump capacitor C2.
1
GND
Ground.
2
C2- Negative terminal of the symmetrical charge-pump capacitor C2.
3
V- Regulated -5.5V output generated by the charge pump.
4
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 ON-LINE® circuitry keeping drivers active
(SHUTDOWN must also be logic HIGH, refer to Table 2).
5
6
7
8
9
10
11
12
13
SHUTDOWN
Apply logic LOW to shut down drivers and charge pump. This overrides all AUTO
ON-LINE® circuitry and ONLINE (refer to Table 2).
14
STATUS TTL/CMOS Output indicating if a RS-232 signal is present on any receiver input.
15
R1OUT
T5IN
R3OUT
T4IN
R2OUT
R1OUT
T3IN
T2IN
T1IN
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 symmetrical charge-pump capacitor C1.
16
17
18
19
20
21
22
23
24
25
VCC +3.0V to +5.5V supply voltage.
V+ Regulated +5.5V output generated by the charge pump.
26
27
C1+ Positive terminal of the symmetrical charge-pump capacitor C1
28
Table 1. Device Pin Description
Rev. 6/30/03
SP3238 Intelligent +3.0V to +5.5V RS-232 Transceiver
5
© Copyright 2003 Sipex Corporation
5 Page 
www.DataSheet4U.net
RECEIVER +2.7V
RS-232 INPUT 0V
VOLTAGES -2.7V
VCC
STATUS
0V
S
H
U
T
D
O
W
N
tSTSL
tSTSH
tONLINE
+5V
DRIVER
RS-232 OUTPUT 0V
VOLTAGES
-5V
Figure 10. AUTO ON-LINE® Timing Waveforms
Figure 11. Charge Pump — Phase 1
VCC = +5V
+
C1 –
–5V
+5V
+
C2 –
–5V
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
Rev. 6/30/03
SP3238 Intelligent +3.0V to +5.5V RS-232 Transceiver
11
© Copyright 2003 Sipex Corporation
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet SP3238.PDF ] | |
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