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PDF XR32430 Data sheet ( Hoja de datos )
| Número de pieza | XR32430 | |
| Descripción | 3-Driver/5-Receiver Intelligent RS-232 Transceiver | |
| Fabricantes | Exar | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de XR32430 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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XR32430/XR32431
3-Driver/5-Receiver Intelligent RS-232 Transceiver
with 1.65V-5.5V Interface
General Description
The XR32430 and XR32431 products are 3 driver/ 5 receiver
RS-232 transceivers. The XR32431 features a variable low volt-
age logic interface, down to 1.65V. These products are intended
for portable or hand-held applications such as notebook and
palmtop computers. The XR32430EB and XR32431EB devices
feature slew-rate limited outputs for reduced crosstalk and EMI.
The XR32430EH and XR32431EH devices are optimized for mid
speed applications, with data rates up to 460Kbps. The
XR32430EU and XR32431EU devices are optimized for high
speed designs with data rates up to 1Mbps, easily meeting the
demands of high speed RS-232 applications.
The XR32430/31 uses an internal high-efficiency charge-pump
power supply that requires only four 0.1μF capacitors in 3.3V
operation. This charge pump combined with Exar's driver archi-
tecture allow the XR32430/31 to deliver compliant RS-232 perfor-
mance 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.
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
•1.65V to 5.5V Logic Interface VL pin (XR32431)
• AUTO ON-LINE circuitry automatically wakes up
from a 1A 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
• 250Kbps/460Kbps/1Mbps min transmission
rates (speed grades B/H/U)
• -40°C to 85°C ambient operating temperature
• Lead-free (RoHS 6) package
APPLICATIONS
• Industrial and Single Board Computers
• Industrial and Process Control Equipment
• Point-Of-Sales Equipment
• Building Security and Automation
Ordering Information – page 13
Typical XR32431 Application and Package Pinout
VL VCC
0.1F
25
VL
26
VCC
0.1F
0.1F
0.1F
23 C1+
28 C1-
29 C2+
30 C2-
12 T1IN
Charge
Pump
V+ 26
V- 30
T1OUT 6
0.1F
0.1F
R1IN 1
R2IN 2
TTL/CMOS
Inputs
To -P Supervisor
Circuit
11 T2IN
10 T3IN
VCC
21 Shutdown
22 OnLine
20 Status
18 R1OUT
17 R2OUT
TTL/CMOS
Outputs
19 R2OUT
15 R3OUT
14 R4OUT
13 R5OUT
Auto On-line /
Control
5K
5K
5K
5K
5K
24
T2OUT 7
T3OUT 8
R1IN 1
R2IN 2
R3IN 3
R4IN 4
R5IN 5
RS-232
Outputs
RS-232
Inputs
R3IN 3
R4IN 4
R5IN 5
T1OUT 6
T2OUT
T3OUT
32 31 30 29 28 27 26 25
GND
C1-
XR32431
32 pin QFN (5x5mm)
R2OUT
18 R1OUT
17 R2OUT
© 2014 Exar Corporation
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exar.comXR32430_XR32431
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1 page  
Pin Configuration
R1IN 1
R2IN 2
R3IN 3
R4IN 4
R5IN 5
T1OUT 6
T2OUT
T3OUT
32 31 30 29 28 27 26 25
XR32430
32 pin QFN (5x5mm)
GND
C1-
R2OUT
18 R1OUT
17 R2OUT
XR32430/XR32431
32 31 30 29 28 27 26 25
R1IN 1
GND
R2IN 2
C1-
R3IN 3
R4IN 4
R5IN 5
T1OUT 6
XR32431
32 pin QFN (5x5mm)
R2OUT
T2OUT
18 R1OUT
T3OUT
17 R2OUT
Pin Assignments
XR32340
XR32341
Pin Name
Type
Description
1, 2, 3, 4, 5
6. 7, 8
9,16, 25, 32
10, 11, 12
13,14,15,
17, 18, 19
20
21
22
23, 28
24
-
26
27
29, 30
31
-
1, 2, 3, 4, 5
6. 7, 8
9,16, 32
10, 11, 12
13,14,15,
17, 18, 19
20
21
22
23, 28
24
25
26
27
29, 30
31
-
R1IN, R2IN,
R3IN, R4IN,
R5IN
T1OUT, T2OUT,
T3OUT
NC
T3IN, T2IN, T1IN
R5OUT, R4OUT,
R3OUT, R2OUT,
R1OUT, R2OUT
Status
Shutdown
Online
C1-, C1+
GND
VL
VCC
V+
C2+, C2-
V-
Paddle
Inputs
(5K pull-
dwn)-
Output
-
Input
Output
Output
Input
Input
Analog
Supply
Supply
Supply
Analog
Analog
Analog
Supply
±15KV ESD Protected, RS-232 Receiver Inputs
±15KV ESD Protected, RS-232 Driver Output
No Connect (not connect to the die). Can be left floating or tied to GND or VCC.
TTL/CMOS Driver Input
TTL/CMOS Receiver Output
TTL/CMOS level output indicating if no valid RS-232 levels are present at the R1IN or
R2IN input pins.
TTL/CMOS level input, when driven low puts the part into shutdown mode (tri-stating
driver outputs and disabling the charge-pump); normal operation when driven high.
TTL/CMOS level input. A low input enables Auto On-Line mode, a high input disables
Auto On-Line Mode.
Negative and positive terminals of voltage doubler charge pump capacitor.
Ground
I/O Power Supply
Power Supply
Regulated positive (+5.5V) charge pump rail.
Positive and negative terminals of the inverting charge pump capacitor.
Regulated positive (-5.5V) charge pump rail.
Ground. The exposed paddle on the bottom of package is connected to device
ground. The paddle should be connected to ground on pcb.
© 2014 Exar Corporation
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XR32430/XR32431
When the XR32430/31 is shut down, the charge pumps are turned off. V+ charge pump output decays to VCC, the V- output
decays to GND. The decay time will depend on the size of capacitors used for the charge pump. Once in shutdown, the time
required to exit the shut down state and have valid V+ and V- levels is typically 30μs.
For easy programming, the STATUS can be used to indicate DSR or a Ring Indicator signal. Tying ONLINE and SHUT-
DOWN together will bypass the AUTO ON-LINE® circuitry so this connection acts like a shutdown input pin.
Valid
RS-232
Level at
Receiver
Input
Yes
No
Yes
No
Yes
No
Table 2: XR32430/31 Operation Truth Table
Shutdown
OnLine
Driver Receiver
Outputs Outputs
Status
Mode of Operation
L x High-Z High-Z H Manually forced shutdown
L x High-Z High-Z L Manually forced shutdown
H L Active Active H Normal Operation
(Auto On-Line® enabled)
H L High-Z Active L Standby Operation due to
Auto On-Line® circuitry
H H Active Active H Normal Operation
H H Active Active L Normal Operation
Table 3: XR32430/31 Driver and Receiver Truth Table
Shutdown
RxIN
RxOUT
TxIN
TxOUT
L x High-Z x High-Z
HLHLH
HHLHL
© 2014 Exar Corporation
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Rev 1A
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet XR32430.PDF ] | |
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