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PDF SP3243E Data sheet ( Hoja de datos )
| Número de pieza | SP3243E | |
| Descripción | 3 Driver/5 Receiver Intelligent +3.0V to +5.5V RS-232 Transceivers | |
| Fabricantes | Exar | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SP3243E (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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SP3243E
3 Driver/5 Receiver Intelligent +3.0V to +5.5V
RS-232 Transceivers
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
■ 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
■ 250 Kbps min. transmission rate (EB)
■ 1000 Kbps min. transmission rate (EU)
■ Ideal for High Speed RS-232 Applications
C2+ 1
C2- 2
V- 3
R1IN
R2IN
R3IN
4
5
6
R4IN 7
R5IN 8
T1OUT 9
T2OUT 10
T3OUT 11
T3IN 12
T2IN 13
T1IN 14
SP3243E
28 C1+
27 V+
26 VCC
25 GND
24 C1-
23 ONLINE
22 SHUTDOWN
21 STATUS
20 R2OUT
19 R1OUT
18 R2OUT
17 R3OUT
16 R4OUT
15 R5OUT
Now Available in Lead Free Packaging
DESCRIPTION
The SP3243E products are 3 driver/5 receiver RS-232 transceiver solutions intended for portable
or hand-held applications such as notebook and palmtop computers. The SP3243E includes one
complementary receiver that remains alert to monitor an external device's Ring Indicate signal while
the device is shutdown. The SP3243E and EB devices feature slew-rate limited outputs for reduced
crosstalk and EMI. The "U" and "H" series are optimized for high speed with data rates up to 1Mbps,
easily meeting the demands of high speed RS-232 applications. The SP3243E series 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 SP3243E series to deliver compliant RS-232
performance from a single power supply ranging from +3.0V to +5.5V. The AUTO ON-LINE® feature
allows the device to automatically "wake-up" during a shutdown state when an RS-232 cable is con-
nected 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 TTL # of Data ESD
Drivers Receivers Components On-Line 3- Pins Rate Rating
Circuitry State
SP3243E +3.0V to +5.5V
3
5
4 Capacitors Yes
Yes 28 120 15kV
SP3243EB +3.0V to +5.5V
3
5
4 Capacitors Yes
Yes 28 250 15kV
SP3243EH +3.0V to +5.5V
3
5
4 Capacitors Yes
Yes 28 460 15kV
SP3243EU +3.0V to +5.5V
3
5
4 Capacitors Yes
Yes 28 1000 15kV
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP3243E_102_060611
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
Unless otherwise noted, the following performance characteristics apply for VCC = +3.3V, 1000kbps data rate, all
drivers loaded with 3kΩ, 0.1µF charge pump capacitors, and TAMB = +25°C.
25
20
15
10
5
00
- Slew
+ Slew
1 Transmitter at 250Kbps
2 Transmitter at 15.6Kbps
All drivers loaded 3K + Load Cap
500 1000 2000 3000 4000 5000
Load Capacitance (pF)
Figure 7. Slew Rate VS. Load Capacitance
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP3243E_102_060611
5 Page 
Minimum recommended charge pump capacitor value
Input Voltage Vcc
Charge pump capacitor value for SP32XX
3.0V to 3.6V
C1 - C4 = 0.1µF
4.5V to 5.5V
C1 = 0.047µF, C2 - C4 = 0.33µF
3.0V to 5.5V
C1 - C4 = 0.22µF
The Exar-patented charge pumps are designed
to operate reliably with a range of low cost
capacitors. Either polarized or non polarized
capacitors may be used. If polarized capacitors
are used they should be oriented as shown in
the Typical Operating Circuit. The V+ capaci-
tor may be connected to either ground or Vcc
(polarity reversed.)
The charge pump operates with 0.1µF capacitors
for 3.3V operation. For other supply voltages, see
the table for required capacitor values. Do not use
values smaller than those listed. Increasing the
capacitor values (e.g., by doubling in value)
The SP3243E devices have a patent pending
AUTO ON-LINE® circuitry on board that saves
power in applications such as laptop computers,
palmtop (PDA) computers and other portable
systems.
The SP3243E devices incorporate an AUTO
ON-LINE® circuit that automatically enables itself
when the external transmitters are enabled and
the cable is connected. Conversely, the AUTO
ON-LINE® circuit also disables most of the inter-
nal circuitry when the device is not being used
and goes into a standby mode where the device
typically draws 1µA. This function is externally
controlled by the ONLINE pin. When this pin is
tied to a logic LOW, the AUTO ON-LINE® function
is active. Once active, the device is enabled until
there is no activity on the receiver inputs. The
receiver input typically sees at least +3V, which
are generated from the transmitters at the other
end of the cable with a +5V minimum.
reduces ripple on the transmitter outputs and
may slightly reduce power consumption. C2,
C3, and C4 can be increased without changing
C1’s value.
For best charge pump efficiency locate the
charge pump and bypass capacitors as close
as possible to the IC. Surface mount capacitors
are best for this purpose. Using capacitors with
lower equivalent series resistance (ESR) and
self-inductance, along with minimizing parasitic
PCB trace inductance will optimize charge pump
operation. Designers are also advised to consider
that capacitor values may shift over time and
operating temperature.
AUTO ONLINE CIRCUITRY
When the external transmitters are disabled or
the cable is disconnected, the receiver inputs will
be pulled down by their internal 5kΩ resistors to
ground. When this occurs over a period of time,
the internal transmitters will be disabled and the
device goes into a shutdown or standy mode.
When ONLINE is HIGH, the AUTO ON-LINE®
mode is disabled.
The AUTO ON-LINE® circuit has two stages:
1) Inactive Detection
2) Accumulated Delay
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
11
SP3243E_102_060611
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet SP3243E.PDF ] | |
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