LTC4310-1/LTC4310-2



431012f

LTC4310 Compatibility with Other LTC Bus Buffers

LTC4300A-1, LTC4303 or LTC4307. During rising edges,

the rise time accelerators of these buffers turn on before

the LTC4310 disables its rise rate regulation circuitry,

resulting in nonmonotonic bus edges.

The LTC4310-1 is compatible with the LTC4301 and

LTC4301L.ItisalsocompatiblewiththeLTC4302,LTC4304,

LTC4305andLTC4306,providedthattherisetimeaccelera-

tors of these buffers are permanently disabled. All of the

previously mentioned buffers are incompatible with the

LTC4310-2 because the compensation networks of these

buffers cause the bus to rise more slowly than (0.35 •

to control the bus rise rate.

LTC4310-1 Compatibility with LTC4310-2

In a typical application such as shown in Figure 1, an

LTC4310-1 can be used on one bus and an LTC4310-2 can

be used on the other, provided that the bus pull-up resis-

tors connected to the LTC4310-1 meet the requirements

of Figure 2, and the bus pull-up resistors connected to the

LTC4310-2 meet the requirements of Figure 3. However,

the bus switching frequency is limited by the rise rate

regulationcircuitryoftheLTC4310-1.Inaddition,significant

skew is introduced on the rising edges due to the large

difference in the controlled rise rates of the two buses. For

this reason, it is recommended to use two LTC4310-1’s

bus with the LTC4310-2, because the LTC4310-1’s rise

rate regulation circuitry controls the bus rise rate to (0.35

to control the bus rise rate.

Using the LTC4310-1 at Frequencies Above 100kHz

Userswhoimplementcustomtwo-wirebusesmayusethe

LTC4310-1atbusfrequenciesabove100kHzprovidedthat

all other devices on the bus can tolerate the approximately

1µs bus rise times resulting from the LTC4310-1’s bus rise

rate regulation circuitry.

applicaTions inForMaTion