參數(shù)資料
型號(hào)： LTC4314CGN#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO20
封裝： LEAD FREE, PLASTIC, SSOP-20
文件頁(yè)數(shù)： 2/20頁(yè)
文件大?。?/td> 197K
代理商： LTC4314CGN#PBF
LTC4314
10
4314f
APPLICATIONS INFORMATION
Figure 3. Connection of the LTC4314 in a Level Shift Application. VCC2 is
Less than or Equal to the Minimum Bus Supply Voltage on the Output Side
LTC4314
GND
VCC
VCC2
4314 F03
SCLOUT1
SDAOUT1
SCLOUT4
SDAOUT4
SCLOUT1
SDAOUT1
SCLOUT4
SDAOUT4
SCLIN
SDAIN
ENABLE1
ENABLE2
ENABLE3
ENABLE4
ACC
DISCEN
FAULT
SCLIN
SDAIN
ENABLE1
ENABLE2
ENABLE3
ENABLE4
3.3V
FAULT
R3
10k
R2
10k
R1
10k
C1
0.01μF
3.3V
R5
10k
R4
10k
C2
0.01μF
5V
R7
10k
R6
10k
If VCC2 is tied low, the output side rise time accelerators
are disabled independent of the state of the ACC pin. Using
a combination of the ACC pin and the VCC2 voltage allows
the user independent control of the input and output side
rise time accelerators. The rise time accelerators are also
internally disabled during power-up and VCC2 transitions
as described in the Operation section, as well as during
automatic clocking and stop bit generation for a bus stuck
low recovery event.
The rise time accelerators when activated pull the bus up
to 0.9VCC on the input side of the SDA and SCL lines. On
the output side the SDAOUT and SCLOUT lines are pulled
up by the rise time accelerators to 0.8VCC2. For VCC2
voltages approaching 2.3V, acceleration of the bus may
not be seen all the way to 0.8VCC2 due to the threshold
voltage of the NFET pass device.
Supply Voltage Considerations in Level Translation
Applications
Care must be taken to ensure that the bus supply voltages
on the input and output sides are greater than 0.9VCC and
0.8VCC2 respectively to ensure that the bus is not driven
above the bus supplies by the rise time accelerators. This
is usually accomplished in a level shifting application by
tying VCC to the input bus supply and VCC2 to the lowest
bus supply on the output side as shown in Figure 3.
If VCC2isgrounded,themultiplexerpassgatesarepowered
from VCC. In this case the minimum output bus supply
of the enabled channels should be greater than or equal
to VCC to prevent cross-conduction between the enabled
output channels. This is shown in Figure 4. Grounding VCC2
as shown in Figure 4 disables the output side rise time
accelerators independent of the state of the ACC pin. The
input rise time accelerators in this conguration continue
to be controlled by the ACC pin and can be enabled inde-
pendently. In Figure 4, ACC is left open to obtain a high VIL
and a 3mA rise time accelerator current on the input side.
Pull-Up Resistor Value Selection
To guarantee that the rise time accelerators are activated
during a rising edge, the bus must rise on its own with
a positive slew rate of at least 0.4V/μs. To achieve this,
choose a maximum RBUS using equation 1:
RBUS(Ω)≤
VDD,BUS(MIN) VRTA(TH)
()
0.4V/s CBUS
(1)
RBUS is the bus pull-up resistor, VDD, BUS(MIN) the mini-
mum bus pull-up supply voltage, VRTA(TH) the voltage at
which the rise time accelerator turns on, which is a func-
tion of ACC, and CBUS the equivalent bus capacitance.
相關(guān)PDF資料
PDF描述
LTC4314CUDC#PBF 4-CHANNEL POWER SUPPLY SUPPORT CKT, QCC20
LTC4314CGN#TRPBF 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO20
LTC4355CDE#TR 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14
LTC4355CS#TR 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16
LTC4355CS 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16
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