LTC4240 Linear Technology, LTC4240 Datasheet - Page 22
![no-image](/images/manufacturer_photos/0/3/388/linear_technology_sml.jpg)
LTC4240
Manufacturer Part Number
LTC4240
Description
CompactPCI Hot Swap Controller with I2C Compatible Interface
Manufacturer
Linear Technology
Datasheet
1.LTC4240.pdf
(28 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC4240CGN
Manufacturer:
LINEAR/凌特
Quantity:
20 000
LTC4240
APPLICATIO S I FOR ATIO
Table 6. R1 and R2 Resistor Values vs Precharge Voltages
V
1.5V
1.4V
1.3V
1.2V
1.1V
1V
22
PRECHARGE
V
PRECHARGE
Figure 11. Precharge Voltage Less Than 1V
GND
10
R11A
18
18
18
18
18
18
PRECHARGE OUT
R11A
=
4.7nF
C3
R11A + R11B
MEDIUM 5V
I/O PIN 128
LONG 3.3V
GROUND
LONG 5V
I/O PIN 1
R11A
U
24 , 5%
3.3V
9.09
7.15
5.36
3.65
1.78
R11B
R11B
LTC4240*
0
R9
PRECHARGE
• 1V
U
CONNECTOR
CompactPCI
BACKPLANE
18
(MALE)
V
0.9V
0.8V
0.7V
0.6V
0.5V
PRECHARGE
*ADDITIONAL DETAILS
OMITTED FOR CLARITY
W
DRIVE
MMBT2222A
CONNECTOR
CompactPCI
BACKPLANE
(FEMALE)
17
Q3
Figure 10. Precharge Application Circuit
16.2
14.7
12.1
9.09
R11A
11
12 , 5%
1k, 5%
R8
R7
2.74
1.74
R22
R21
DATA BUS
10 , 5%
10 , 5%
R
5V
3V
U
R
I0128
I01
IN
IN
3V
4240 F11
1.78
3.65
5.11
7.15
9.09
IN
R11B
21
22
5V
3V
PRECHARGE OUT
GND
IN
IN
*ADDITIONAL DETAILS OMITTED FOR CLARITY
I
10
OUT
18 , 5%
R11
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
1V 20%
= 55mA
PRECHARGE
18
V
R
10k
5%
PRECHARGE
Figure 12. Precharge Voltage Greater Than 1V
PRE1
4.7nF
C3
GND PRECHARGE
10
LTC4240*
24 , 5%
R11A
=
R
10k
5%
R9
PRE128
R11A + R11B
UP TO 128
I/O LINES
MMBT2222A
R11A
18
DRIVE
R11B
LTC4240*
Q3
PRECHARGE OUT
17
4.7nF
C3
• 1V
1k, 5%
I/O
I/O
12 , 5%
R8
24 , 5%
R7
R9
*ADDITIONAL DETAILS
OMITTED FOR CLARITY
BRIDGE
(21154)
PCI
DRIVE
MMBT2222A
4240 F10
3V
17
IN
Q3
12 , 5%
1k, 5%
R7
R8
3V
4240 F12
IN
4240f