Datasheet

TFDU4101
www.vishay.com
Vishay Semiconductors
Rev. 1.7, 29-Jun-2018
2
Document Number: 81288
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FUNCTIONAL BLOCK DIAGRAM
PIN DESCRIPTION
PIN
NUMBER
SYMBOL DESCRIPTION I/O ACTIVE
1
V
CC2
IRED anode
IRED anode to be externally connected to V
CC2
. An external resistor is
only necessary for controlling the IRED current when a current reduction
below 300 mA is intended to operate in IrDA low power mode.
This pin is allowed to be supplied from an uncontrolled power supply
separated from the controlled V
CC1
- supply.
2 IRED cathode IRED cathode, internally connected to driver transistor
3TXD
This Schmitt-Trigger input is used to transmit serial data when SD is low.
An on-chip protection circuit disables the LED driver if the TXD pin is
asserted for longer than 50 μs (max. 300 μs).
IHigh
4RXD
Received data output, push-pull CMOS driver output capable of driving
standard CMOS or TTL loads. During transmission the RXD output is
active (echo-on). No external pull-up or pull-down resistor is required.
Floating with a weak pull-up of 500 kΩ (typ.) in shutdown mode.
OLow
5 SD Shutdown I High
6V
CC1
Supply voltage
7 NC No internal connection I
8 GND Ground
Controlled
driver
Tri-state
driver
GND
TXD
RXD
V
CC2
V
CC1
SD
IRED C
18468
ComparatorAmplier
Logic
and
control