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PDF SP3238E Data sheet ( Hoja de datos )
| Número de pieza | SP3238E | |
| Descripción | Intelligent +3.0V to +5.5V RS-232 Transceiver | |
| Fabricantes | Exar | |
| 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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SP3238E
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
■ Enhanced ESD Specifications:
+15kV Human Body Model
+15kV IEC61000-4-2 Air Discharge
+8kV IEC61000-4-2 Contact Discharge
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
SP3238E
28 C1+
27 V+
26 VCC
25 C1-
24 T1IN
23 T2IN
22 T3 IN
21 R1OUT
20 R2OUT
19 T4IN
18 R3OUT
17 T5IN
16 R1OUT
15 STATUS
Now Available in Lead Free Packaging
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 Exar's driver
architecture allow the SP3238E device to deliver compliant RS-232 performance from a single power
supply ranging from +3.0V to +5.5V. The SP3238E is a 5-driver / 3-receiver device that is 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 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.
Device
SP3220E
SP3223E
SP3243E
SP3238E
Power
Supplies
+3.0V to +5.5V
+3.0V to +5.5V
+3.0V to +5.5V
+3.0V to +5.5V
RS-232
Drivers
1
2
3
5
RS-232
Receivers
1
2
5
3
External
Components
4 Capacitors
4 Capacitors
4 Capacitors
4 Capacitors
Auto
On-Line
Circuitry
No
Yes
Yes
Yes
SELECTION TABLE
TTL 3-State
# of
Pins
Yes 16
Yes 20
Yes 28
Yes 28
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP3238E_100_020111
1 page  
NAME
C2+
GND
C2-
V-
T1OUT
T2OUT
T3OUT
R1IN
R2IN
T4OUT
R3IN
T5OUT
ONLINE
SHUTDOWN
STATUS
R1OUT
T5IN
R3OUT
T4IN
R2OUT
R1OUT
T3IN
T2IN
T1IN
C1-
Vcc
V+
C1+
FUNCTION
Positive terminal of the symmetrical charge-pump capacitor C2.
Ground.
Negative terminal of the symmetrical charge-pump capacitor C2.
Regulated -5.5V output generated by the charge pump.
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).
Apply logic LOW to shut down drivers and charge pump.
This overrides all AUTO ON-LINE® circuitry and ONLINE (Refer to table 2).
TTL/CMOS Output indicating if a RS-232 signal is present on any receiver
input.
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.
+3.0V to +5.5V supply voltage.
Regulated +5.5V output generated by the charge pump.
Positive terminal of the symmetrical charge-pump capacitor C1.
PIN NUMBER
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
Table 1. Device Pin Description
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP3238E_100_020111
5 Page 
VCC
+
C5 0.1µF
+ 28 C1+
C1 0.1µF
25 C1-
+ 1 C2+
C2 0.1µF
3 C2-
26
VCC
SP3238E
V+
V-
16 R1OUT
21 R1OUT
R1IN
20 R2OUT
5kΩ
R2IN
18 R3OUT
5kΩ
R3IN
5kΩ
24 T1IN
T1OUT
27
+
C3 0.1µF
4
C4 0.1µF
+
8
9
11
5
23 T2IN
T2OUT 6
22 T3IN
T3OUT 7
19 T4IN
T4OUT 10
17 T5IN
VCC 14 SHUTDOWN
13 ONLINE
To µP Supervisor
Circuit
15 STATUS
GND
2
T5OUT 12
DB-9 Connector Pins:
1. Received Line Signal Detector 6. DCE Ready
2. Received Data
7. Request to Send
3. Transmitted Data
8. Clear to Send
4. Data Terminal Ready
9. Ring Indicator
5. Signal Ground (Common)
DB-9
Connector
6
7
8
9
1
2
3
4
5
Figure 15. Circuit for the connectivity of the SP3238E with a DB-9 connector
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
11
SP3238E_100_020111
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet SP3238E.PDF ] | |
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