TOIM4232

Document Number 82546

Rev. 1.5, 06-Jun-06

Vishay Semiconductors

www.vishay.com

3

Block diagram of application circuit

Operating the interface circuit at a PC COM - port.

When operating directly with an UART with 3 V - or

5 V - logic, in the application circuit no level converter

is necessary.

Table 1.

Recommended Application Circuit Components

Absolute Maximum Ratings

DC Characteristics

18081

DTR

RTS

TXD

RXD

RESET VCC_SD

BR/D

TD_IR

TD_232

RD_IR

RD_232

TOIM4232

VCC

TXD

RXD

RS232 9 pin

connector

Level

converter

X1

X2

TFDU4100

TFDS420x

TFDU4300

R1

100 k

Ω

C1

C2

3.6864 MHz

2x22pF

Component

Recommended Value

Vishay Part Number

C1

22 pF

VJ 1206 A 220 J XAMT

C2

22 pF

VJ 1206 A 220 J XAMT

R1

100 k

Ω

CRCW-1206-1003-F-RT1

Quartz Crystal

3.686400 MHz

XT49S - 20 - 3.686400M

Parameter

Test Conditions

Symbol

Min

Typ.

Max

Unit

Supply voltage

- 0.5

3.6

V

Input voltage

all pins

- 0.5

5.5

V

Output voltage

all pins

- 0.5

V

Output sinking current, max

all pins

8mA

Junction temperature, max

125

°C

Ambient temperature

(operating)

- 25

85

°C

Storage temperature

- 25

85

°C

Soldering temperature

260

°C

Parameter

Test Conditions

Symbol

Min

Typ.

Max

Unit

Operating voltage

2.7

3.3

3.6

V

Parameter

Test Conditions

Symbol

Min

Typ.

Max

Unit

Input HIGH voltage

inputs tolerate levels as high as

5.5 V max. all inputs are Schmitt

trigger inputs

2.0

V

Input LOW voltage

0.8

V

Input Schmitt trigger hysteresis

0.6

V