LTC4300A-3IDD datasheet(10/12 Pages) LINER

Part #	LTC4300A-3IDD

Description	Level Shifting Hot Swappable 2-Wire Bus Buffer with Enable

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC4300A-3

10

sn4300a3 4300a3fs

APPLICATIO S I FOR ATIO

5V to 3.3V Level Translator and Power Supply

Redundancy

Systems requiring different supply voltages for the

backplane side and the card side can use the LTC4300A-3,

as shown in Figure 5. The pull-up resistors on the card side

connect from SDAOUT to SCLOUT to VCC2, and those on

the backplane side connect from SDAIN and SCLIN to VCC.

The LTC4300A-3 functions for voltages ranging from 2.7V

to 5.5V on both VCC and VCC2. There is no constraint on the

voltage magnitudes of VCC and VCC2 with respect to each

other.

This application also provides power supply redundancy.

If the VCC2 voltage falls below its UVLO threshold, the

LTC4300A-3 disconnects the backplane from the card, so

that the backplane can continue to function. If the VCC

voltage falls below its UVLO threshold and the VCC2

voltage remains active, hold ENABLE at ground to ensure

proper operation.

VCC

SDAIN

SCLIN

VCC2

GND

SDAOUT

SCLOUT

ENABLE

4300A-3 F04

I/O PERIPHERAL CARD 1

LTC4300A-3

C2 0.01µF

CARD_SCL

CARD_SDA

R7

10k

R8

10k

VCC2

BACKPLANE

CONNECTOR

SDA

SCL

ENA2

ENA1

VCC

C1

0.01µF

VCC

SDAIN

SCLIN

VCC2

GND

SDAOUT

SCLOUT

ENABLE

I/O PERIPHERAL CARD 2

LTC4300A-3

C4 0.01µF

CARD2_SCL

CARD2_SDA

C3

0.01µF

R1

10k

R2

10k

R3

10k

R4

10k

R5

10k

R6

10k

Figure 4. The LTC4300A-3 in a Custom Application. Making ENABLE the Shortest Pin Ensures that

VCC and VCC2 Connect Before ENABLE is Allowed to Go High, Connecting the Card to the Backplane

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LTC4300A-3IDD Datasheet(PDF) 10 Page - Linear Technology

LTC4300A-3IDD Datasheet(HTML) 10 Page - Linear Technology

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