Notes:

1. CX1, CX2, CX3 and CX4 must be placed within 0.7 cm of the HSDL-3209 to obtain optimum noise immunity.

Recommended Application Circuit Components

I/O Pins Configuration Table

Order Information

Part Number

Packaging Type

Package

Quantity

HSDL-3209-021

Tape and Reel

Front View

2500

Pin

Symbol

Description

I/O Type

Function

1

LED A

LED Anode

Input

Tied through external resistor, R1, to VLED from 2.4V to

4.5V. Please refer to Table 1 for VLED versus Series Resistor,

R1.

2

RXD

Receive Data

Output,

Active Low

This pin is capable of driving a standard CMOS or TTL load.

No external pull-up or pull down resistor is required. It is in

tri-state mode when the transceiver is in shutdown mode.

3

TXD

Transmit Data

Input,

Active High

This pin is used to transmit serial data when SD pin is low.

If held high longer than ~ 50ms, the LED will be turned off.

4

SD

Shutdown

Input,

Active High

The transceiver is in shutdown mode if this pin is high

5

IOVcc

Input/Output

ASIC Vcc

Input/Output

Active High

Connect to ASIC logic controller Vcc Voltage as low as 1.5V.

6

Vcc

Supply

Voltage

Supply

Voltage

Regulated, 2.4 to 3.6 Volts.

7

GND

Ground

Ground

Connect to system ground.

Component

Recommended Value

Note

R1

15W±5%, 0.0625 Watt for 2.4

27W±5%, 0.0625 Watt for 2.7 < Vled

36W±5%, 0.0625 Watt for 3.6 < Vled

CX1, CX4

0.47

1

CX2, CX3

6.8

1

CAUTIONS: The CMOS inherent to the design of this component increases the component’s susceptibility to damage

from the electrostatic discharge (ESD). It is advised that normal static precautions be taken in handling and assembly

of this component to prevent damage and/or degradation which may be induced by ESD