1318 Просмотр технического описания (PDF) - Linear Technology

Номер в каталоге

Компоненты Описание

производитель

1318

Single 5V RS232/RS422/AppleTalk® DCE Transceiver

Linear Technology 

LTC1318

PIN FUNCTIONS

C2+, C2– (Pins 22, 23): C2 inputs. Connect a 0.1µF capacitor

between C2+ and C2–.

V– (Pin 24): Charge Pump Negative Output. This pin

requires a 0.1µF capacitor to ground. Under normal opera-

tion, this pin maintains a voltage of about 8.6V below

ground. An external load can be connected between this

pin and ground or V+.

TEST CIRCUITS

+

RL/2

TXD+

TXD

VOD

TXD–

+

RL/2 VOC

–

–

1318 F01

Figure 1.

U

W

SWITCHING WAVEFORMS

TXD

TXD+

RD

TXD–

CL RXD+

CL

RXD–/

RXI2

RXD0/RXD2

CL

Figure 2.

1318 F02

3V

TXD

0V

VO

–VO

TXD–

TXD+

f = 1MHz: tr ≤ 10ns: tf ≤ 10ns

1.5V

1.5V

tPLH

50%

10%

tr

90% VDIFF = V(TXD+) – V(TXD– )

1/2 VO

tPHL

90%

50%

10%

tf

VO

tSKEW

tSKEW

LT1318 • F03

Figure 3. Differential Driver

V OD2

(RXD+) – (RXD–)

–VOD2

VOH

RXDO

VOL

f = 1MHz: tr ≤ 10ns: tf ≤ 10ns

tPLH

1.5V

tPHL

1.5V

Figure 4. Differential Receiver

LT1318 • F04

6

Share Link: