LTC4312

1

4312f

TYPICAL APPLICATION

DESCRIPTION

Pin-Selectable, 2-Channel,

2-Wire Multiplexer

with Bus Buffers

multiplexer that allows one upstream bus to connect to

any combination of downstream busses or channels.

An individual enable pin controls each connection. The

LTC4312 provides bidirectional buffering, keeping the up-

stream bus capacitance isolated from the downstream bus

capacitances. The high noise margin allows the LTC4312

(> 0.4V). The LTC4312 supports level translation between

1.5V, 1.8V, 2.5V, 3.3V and 5V busses. The hot-swappable

nature of the LTC4312 allows I/O card insertion into, and

removal from, a live backplane without corruption of the

data and clock busses.

If both data and clock are not simultaneously high at

least once in 45ms and DISCEN is high, a FAULT signal is

generated indicating a stuck bus low condition, the input

is disconnected from each enabled output channel and up

to 16 clocks are generated on the enabled downstream

busses. A three state ACC pin enables input and output

side rise time accelerators of varying strengths and sets

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. All other

trademarks are the property of their respective owners. Protected by U.S. Patents, including

6356140, 6650174, 7032051, 7478286.

FEATURES

APPLICATIONS

Activation Voltage

Insertion and Removal from Backplane

Packages

Rising Edge from Asserted Low

with Level Translation

LTC4312

GND

4314 TA01a

SCLOUT1

SDAOUT1

SCLOUT2

SDAOUT2

SCLOUT1

SDAOUT1

SCLOUT2

SDAOUT2

SCLIN

SDAIN

ENABLE1

ENABLE2

ACC

DISCEN

FAULT

SCLIN

SDAIN

ENABLE1

ENABLE2

3.3V

10k

FAULT

10k

10k

0.01μF

3.3V

3.3V

10k

10k

5V

10k

10k

0.01μF

200ns/DIV

4312 TA01b

SCLOUT2

SCLOUT1

SCLIN

0V

6V

5V

3.3V