LTC1323CS データシートの表示（PDF） - Linear Technology

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LTC1323CS

Single 5V AppleTalk® Transceiver

Linear Technology 

LTC1323

PI FU CTIO S

TXO: Single-Ended Driver Output.

TXD+: Differential Driver Noninverting Output.

TXD–: Differential Driver Inverting Output.

VEE: Negative Supply Charge Pump Output. Requires a

1µF bypass capacitor to ground. If an external load is

connected to the VEE pin, the bypass capacitor value

should be increased to 4.7µF.

C2–: C2 Negative Input. Connect a 0.33µF capacitor

between C2+ and C2 –.

C2+: C2 Positive Input. Connect a 0.33µF capacitor

between C2+ and C2–.

VCC: Positive Supply Input. 4.5V ≤ VCC ≤ 5.5V. Requires a

1µF bypass capacitor to ground.

TEST CIRCUITS

TXD+

R

VOD

R VOC

TXD–

LTC1323 • F01

Figure 1

VCC

OUTPUT

S1

500Ω

CL

S2

TXI RXD+

RL

TXD–

CL RXD+

CL RXD–

RXDO

15pF

Figure 2

LTC1323 • F02

TXD+

TXI

TXD–

RL

RL

CL

CL

LTC1323 • F03

Figure 3

TXI

TXO

CL

RL

RXI

RXO

RXI

RXO

CL

CL

LTC1323 • F04

Figure 4

Figure 5

LTC1323 • F05

U

W

SWITCHI G WAVEFOR S

Figure 6

3V

TXD

0V

VO

–VO

TXD–

TXD+

1.5V

f = 1MHz: tr ≤ 10ns: tf ≤ 10ns

1.5V

tPLH

50%

10%

tr

90% VDIFF = V(TXD+) – V(TXD– )

1/2 VO

tPHL

90%

50%

10%

tf

VO

tSKEW

Figure 7. Differential Driver

tSKEW

LTC1323 • F07

LTC1323 • F06

7

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