TFDU4201 Vishay, TFDU4201 Datasheet - Page 5

• Manufacturer Part Number: TFDU4201
• Manufacturer: Vishay
• Type: TX/RXr

Specifications of TFDU4201

• Data Rate: 115.2Kbps
• Peak Wavelength: 900nm
• Pulse Width: 20us
• Package Type: Ultra Small Profile
• Fall Time: 200/70ns
• Rise Time: 200/70ns
• Dimensions: 7.1x4.7x2.8
• Operating Supply Voltage (typ): 2.5/3.3/5V
• Operating Supply Voltage (min): 2.4V
• Operating Supply Voltage (max): 5.5V
• Mounting: Surface Mount
• Pin Count: 8
• Operating Temp Range: -25C to 85C
• Operating Temperature Classification: Commercial
• Lead Free Status / Rohs Status: Compliant

Application Hints
The TFDU4202 does not need any external compo-
nent when operated with a "clean" power supply. In a
more noisy ambient it is recommended to add a
capacitor C1 and a resistor R1 for noise suppression.
A combination of a tantalum with a ceramics capacitor
will be efficient to attenuate both, RF and LF. The
power supply V
550 mA current with a fast rise time. If that cannot be
guaranteed an additional capacitor near pin 4 (V
should be included. The value is depending on the
power supply quality. A good choice is between
4.7 µF and 10 µF.
Latency
The receiver is in specified conditions after the
defined latency.
In a UART related application after that time after the
last transmitted signal (IrDA specifies 500 µs maxi-
mum for low power applications and 10 ms maximum
for standard) the receiver buffer of the UART must be
Table
Recommended Application Circuit Components
This is a recommendation for a combination to start with to exclude power supply effects.
Optimum, from a costs point of view, to work without both.
Temperature Derating Diagram
Document Number 82541
Rev. 2.0, 06-Oct-06
Component
18097
90
85
80
75
70
65
60
55
50
C1
R1
2.0
Figure 1. Temperature Derating Diagram
2.5
Operating Voltage [V] at duty cycle 20 %
ccp
3.0
must be able to source up to
3.5
4.0
Recommended Value
5 Ω ( 2 Ω to 47 Ω)
4.5
4.7 µF, 16 V
5.0
5.5
6.0
ccp
)
cleared. Therefore the transceiver has to wait at least
the specified latency after receiving the last bit before
starting the transmission to be sure that the corre-
sponding receiver is in a defined state.
For more application circuits, see IrDC Design Guide
and TOIM4232 data sheet.
Recommended Circuit Diagram
The temperature derating diagram shows the maxi-
mum operating temperature when the device is oper-
ated without external current limiting resistor. A power
dissipating resistor of 2 Ω is recommended from the
cathode of the IRED to Ground for supply voltages
above 4 V. In that case the device can be operated up
to 85 °C, too.
Vccp
GND
RXD
TXD
V
CC
R1
293D 475X9 016B 2T
R2
Vishay Part Number
Vishay Semiconductors
C1
8
5, 6
3
7
4
1, 2 IRED Cathode
V
GND
RXD
TXD
V
CC
CCP
TFDU4202
www.vishay.com
18187
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