TFDU4100/TFDS4500/TFDT4500

TELEFUNKEN

Semiconductor

Pre-Release Information

2

Pending—Rev. A, 03-Apr-98

Functional Block Diagram

Amplifier

Comparator

AGC

Logic

SC

Txd

Driver

GND

Open Collector Driver

Rxd

IRED Anode

IRED Cathode

Pin Assignment and Description

Pin Number

“ U ”, “ T ”

Option

“ S ”

Option

Function

Description

I/O

Active

1

8

IRED Anode

control resistor

2

1

IRED Cathode

IRED cathode, internally connected to driver transistor

3

7

Txd

Transmit Data Input

I

HIGH

4

2

Rxd

Received Data Output, push–pull CMOS driver output capable of driving a

standard CMOS or TTL load. No external pull–up or pull–down resistor is

required (20 k

Ω resistor internal to device). Pin is inactive during

transmission.

O

LOW

5

6

NC

Do not connect

6

3

Supply Voltage/Shutdown (see “Shutdown” on page 6)

7

5

SC

Sensitivity control

I

HIGH

8

4

GND

Ground

1

234

5

6

7

8

IRED

Detector

12

3

4

5

6

7

8

1 2 345 6 7 8

IRED

Detector

IRED

Detector

”U” Option

BabyFace (Universal)

”S” Option

Side View

”T” Option

Top View