LTC4308 LINER [Linear Technology], LTC4308 Datasheet - Page 12

• Manufacturer Part Number: LTC4308
• Description: Low Voltage, Level Shifting Hot Swappable 2-Wire Bus Buffer with Stuck Bus Recovery
• Manufacturer: LINER [Linear Technology]

APPLICATIONS INFORMATION
LTC4308
Systems with Supply Voltage Droop
In large 2-wire systems, the V
at various points in the system can differ by a few hundred
millivolts or
resistor in the V
operation, make sure that the V
Table 1: Differences Between LTC4301l and LTC4308
SPECIFICATION
V
V
I
t
READY
CS/ENABLE
12
PULLUPAC(TYP)
TIMEOUT
CC(MIN)
OS(TYP)
more.
LTC4301L
2.7V
100mV
N/A
N/A
–
Active Low Active High
CC
line, as shown in Figure 6. For proper
This situation is modeled by a series
LTC4308
2.3V
–200mV/300mV Negative output-to-input offset voltage provide better noise margin on low voltage bus.
8mA
30ms
–
CC
CC(LTC4308)
voltages seen by devices
COMMENTS
Lower supply voltage allows greater compatibility with low voltage systems.
Output bus rise time accelerators aid heavily loaded busses to meet rise time specifi cations.
Stuck Bus Recovery automatically isolates the input bus from the output bus and attempts to recover
the output bus.
READY functions identically. In addition, the LTC4308 will pull READY low to indicate when
disconnection has occurred.
When replacing an LTC4301L with an LTC4308, invert the CS signal.
is ≥ 2.3V.
LTC4308 and LTC4301L Feature Comparison
Although both, the LTC4308 and LTC4301L are func-
tionally similar Hot Swappable Bus Buffers designed for
Low Voltage Level Translation in 2-wire bus systems, the
LTC4308 provides greater features. These features include
automatic bus stuck low detection and recovery; rise time
accelerators on the output busses, and –200mV In-Out and
300mV Out-In offset voltages that are nearly independent
of pull-up resistors. These and other differences are listed
in Table 1 and must be accounted for if using the LTC4308
in LTC4301L applications.
4308f