18

LTC4244/LTC4244-1

42441f

APPLICATIO S I FOR ATIO

Figure 8. Precharge Voltage >1V Application Circuit

Q3

MMBT2222A

12

Ω

5%

4244 F08

1k

5%

18

Ω

5%

R10B

R10A

PRECHARGE OUT

*ADDITIONAL DETAILS OMITTED FOR CLARITY

4.7nF

11

12

8

R10A + R10B

R10A

• 1V

DRIVE

PRECHARGE

LTC4244*

GND

Figure 7. Precharge Voltage <1V Application Circuit

Q3

MMBT2222A

12

Ω

5%

4244 F07

1k

5%

18

Ω

5%

R10B

R10A

PRECHARGE OUT

*ADDITIONAL DETAILS OMITTED FOR CLARITY

4.7nF

11

12

8

R10A

R10A + R10B

• 1V

DRIVE

PRECHARGE

LTC4244*

GND

C9

0.01

µF PER

POWER PIN

13

5

12

11

Z4: SMAJ5.0A

*ADDITIONAL DETAILS OMITTED FOR CLARITY

DATA BUS

I/O

4244 F09

Q3

MMBT2222A

8

R10

18

Ω 5%

R19

1k 5%

R13

10

Ω

5%

R11

10k

5%

R12

10k

5%

PRECHARGE OUT

1V

±10%

I/O

R14

10

Ω

5%

R22

2.7

Ω

R8

1k 5%

R7

12

Ω 5%

C3 4.7nF

R9

24

Ω

PCI

BRIDGE

CHIP

5V

LONG 5V

BD_SEL#

GROUND

I/O PIN 1

I/O PIN 128

Z4

C7

0.01

µF

UP TO 128 I/O LINES

0.1

µF

100

Ω

Q2

MMBT3906

R23

51.1k 5%

R24

75k

5%

BUS SWITCH

OE

OUT

OUT

IN

PCB EDGE

BACKPLANE

CONNECTOR

BACKPLANE

CONNECTOR

R20

1.2k

5%

GND

OFF/ON

LTC4244*

PRECHARGE

DRIVE

Figure 9. Precharge Bus Switch Application Circuit for 3.3V and Universal Hot Swap Boards