參數資料
| 型號： | LTC4312IMS#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數： | 1/20頁 |
| 文件大小： | 0K |
| 描述： | IC MULTIPLEXER 16-MSOP |
| 標準包裝： | 2,500 |
| 系列： | * |
LTC4312
1
4312f
TYPICAL APPLICATION
DESCRIPTION
Pin-Selectable, 2-Channel,
2-Wire Multiplexer
with Bus Buffers
The LTC4312 is a hot-swappable 2-channel 2-wire bus
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
to be interoperable with I2C devices that drive a high VOL
(> 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
the VIL,RISING voltage.
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
n 1:2 Multiplexer/Switch for 2-Wire Bus
n Bidirectional Buffer for SDA and SCL Lines
n High Noise Margin with VIL = 0.3VCC
n ENABLE Pins Connect SDA and SCL Lines
n Selectable Rise Time Accelerator Current and
Activation Voltage
n Level Shift 1.5V, 1.8V, 2.5V, 3.3V and 5V Busses
n Prevents SDA and SCL Corruption During Live Board
Insertion and Removal from Backplane
n Stuck Bus Disconnect and Recovery
n Compatible with I2C, I2C Fast Mode and SMBus
n ±4kV Human Body Model (HBM) ESD Ruggedness
n 14-Lead 4mm × 3mm DFN and 16-Lead MSOP
Packages
n Telecommunications Systems Including ATCA
n Address Expansion
n Level Translator
n Capacitance Buffers/Bus Extender
n Live Board Insertion
n PMBus
Rising Edge from Asserted Low
with Level Translation
LTC4312
GND
VCC
VCC2
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
0.01μF
3.3V
10k
5V
10k
0.01μF
200ns/DIV
1V
/DIV
4312 TA01b
CSCLOUT1 + CSCLOUT2 = 100pF
CSCLIN = 50pF
SCLOUT2
SCLOUT1
SCLIN
0V
6V
5V
3.3V
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