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LTC4240IGN Datasheet(PDF) 22 Page - Linear Technology

Part # LTC4240IGN
Description  CompactPCI Hot Swap Controller with I2C Compatible Interface
PDF  28 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4240IGN Datasheet(HTML) 22 Page - Linear Technology

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LTC4240
22
4240f
Table 6. R1 and R2 Resistor Values vs Precharge Voltages
VPRECHARGE
R11A
R11B
VPRECHARGE
R11A
R11B
1.5V
18
Ω
9.09
Ω
0.9V
16.2
Ω
1.78
Ω
1.4V
18
Ω
7.15
Ω
0.8V
14.7
Ω
3.65
Ω
1.3V
18
Ω
5.36
Ω
0.7V
12.1
Ω
5.11
Ω
1.2V
18
Ω
3.65
Ω
0.6V
11
Ω
7.15
Ω
1.1V
18
Ω
1.78
Ω
0.5V
9.09
Ω
9.09
Ω
1V
18
Ω
0
Ω
Figure 12. Precharge Voltage Greater Than 1V
Figure 11. Precharge Voltage Less Than 1V
3VIN
5VIN
3VIN
5VIN
22
21
LTC4240*
4240 F10
RI01
10
Ω, 5%
I/O
I/O
RI0128
10
Ω, 5%
PCI
BRIDGE
(21154)
UP TO 128
I/O LINES
DATA BUS
3VIN
GND
PRECHARGE
18
DRIVE
17
10
RPRE1
10k
5%
PRECHARGE OUT
1V
±20%
IOUT = ±55mA
R11
18
Ω, 5%
RPRE128
10k
5%
R8
1k, 5%
R7
12
Ω, 5%
C3
4.7nF
R9
24
Ω, 5%
CompactPCI
BACKPLANE
CONNECTOR
(FEMALE)
CompactPCI
BACKPLANE
CONNECTOR
(MALE)
MEDIUM 5V
LONG 5V
3.3V
LONG 3.3V
GROUND
I/O PIN 1
I/O PIN 128
R22
2.74
Ω
R21
1.74
Ω
*ADDITIONAL DETAILS OMITTED FOR CLARITY
Q3
MMBT2222A
Q3
MMBT2222A
C3
4.7nF
R7
12
Ω, 5%
R9
24
Ω, 5%
R8
1k, 5%
3VIN
PRECHARGE OUT
GND
PRECHARGE
DRIVE
LTC4240*
10
18
17
R11A
R11B
VPRECHARGE =
• 1V
R11A
R11A + R11B
4240 F11
*ADDITIONAL DETAILS
OMITTED FOR CLARITY
Q3
MMBT2222A
C3
4.7nF
R7
12
Ω, 5%
R9
24
Ω, 5%
R8
1k, 5%
3VIN
PRECHARGE OUT
GND PRECHARGE
DRIVE
LTC4240*
10
18
17
R11A
R11B
VPRECHARGE =
• 1V
R11A + R11B
R11A
4240 F12
*ADDITIONAL DETAILS
OMITTED FOR CLARITY
Figure 10. Precharge Application Circuit
Precharge resistors are used to connect the 1V bias
voltage to the CompactPCI connector I/O lines. This allows
live insertion of the I/O lines with minimal disturbance.
Figure 13 shows the precharge application circuit for 5V
signaling environments. The precharge resistor require-
ments are more stringent for 3.3V and Universal Hot Swap
signaling. If the total leakage current on the I/O line is less
APPLICATIO S I FOR ATIO



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