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PDF SP3221E Data sheet ( Hoja de datos )
| Número de pieza | SP3221E | |
| 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 SP3221E (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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SP3221E
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 typical shutdown
• Minimum 250kbps data rate under load
• Regulated charge pump yields stable
RS-232 outputs regardless of VCC variations
• ESD specifications:
+15KV Human Body Model
+15KV IEC61000-4-2 Air Discharge
+8KV IEC61000-4-2 Contact Discharge
EN 1
C1+ 2
V+ 3
C1- 4
C2+ 5
C2- 6
V- 7
R1IN 8
SP3221E
16 SHDN
15 VCC
14 GND
13 T1OUT
12 ONLINE
11 T1IN
10 STATUS
9 R1OUT
DESCRIPTION
The SP3221E is an RS-232 transceiver solution intended for portable applications such as
notebook and hand held computers. This device 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 SP3221E to deliver compliant RS-232 performance from
a single power supply ranging from +3.0V to +5.5V. The SP3221E is a 1-driver/1-receiver
device ideal for laptop/notebook computer and PDA applications. The SP3221E is offered
in 16 pin TSSOP and SSOP packages.
The AUTO ON-LINE® feature allows the device to automatically "wake-up" during a shut-
down 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
SP3221E
Power
Supplies
+3.0V to +5.5V
RS- 232
Drivers
1
RS-232
Receivers
1
AUTO ON-LINE ®
YES
TTL
3-state
YES
Data Rate
(kbps)
250
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • www.exar.com
SP3221E_102_091014
1 page  
TYPICAL OPERATING CIRCUIT
Figure 1. SP3221E Typical Operating Circuit
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • www.exar.com
SP3221E_102_091014
5 Page 
VCC = +5V
+
C1 –
–5V
+5V
+
C2 –
–5V
C4
+ – VDD Storage Capacitor
– + VSS Storage Capacitor
C3
Figure 8. Charge Pump - Phase 1
VCC = +5V
C4
+ + + – VDD Storage Capacitor
C1 –
C2 –
– + VSS Storage Capacitor
–10V
C3
Figure 9. Charge Pump - Phase 2
[T
a) C2+
1
22
T
]
+6V
0V
0V
b) C2-
T
-6V
Ch1 2.00V Ch2 2.00V M 1.00ms Ch1 1.96V
Figure 10. Charge Pump Waveforms
VCC = +5V
+
C1 –
–5V
+5V
+
C2 –
–5V
C4
+ – VDD Storage Capacitor
– + VSS Storage Capacitor
C3
Figure 11. Charge Pump - Phase 3
VCC = +5V
+
C1 –
+10V
+
C2 –
C4
+ – VDD Storage Capacitor
– + VSS Storage Capacitor
C3
Figure 12. Charge Pump - Phase 4
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • www.exar.com
11
SP3221E_102_091014
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet SP3221E.PDF ] | |
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