AL440B

November 28, 2001

32

15.0 Application Notes

15.1 Chip Global Reset Recommend Circuit

To ensure a proper reset pulse can be applied to /RESET pin (pin 27) to complete the power-on reset,

Ω

resistor and to Ground with a 10

µf capacitor as follows.

AL440B Global Reset Circuit

8-bit Input

8-bit Output

DI[7:0]

AL440B

DO[7:0]

/RESET

27

50K

Ohm

2K

Ohm

10 uf

VDD

It is also recommend adding buffers for the power-on reset circuit to increase the driving capability

for any application with multiple AL440B chips.

15.2 The AL440B Reference Schematic

WE

WCK

WRST

RE

RRST

IE

IRDY

OE

RCK

SDA

SDAEN

ORDY

SCL

FAVDD

VDD3S

VDD3S

DI0

DI1

DI2

DI3

DI4

DI5

DI6

DI7

CTL0

CTL1

CTL2

CTL3

CTL4

DO0

DO1

DO2

DO3

DO4

DO5

DO6

DO7

CTL7

CTL8

CTL9

CTL10

CTL11

CTL12

CTL13

CTL14

VDD3S

CTL5

VDD3S

VDD3S

FDVDD

R1

2K

+

C67

10uF

RNSMD1

10

8

1

7

6

2

5

3

4

RNSMD3

10

8

1

7

6

2

5

3

4

C55

0.1uf

L5

FB

1

2

F

B

L7

FB

1

2

F

B

C62

0.1uf

+

C54

10uF

R5

10

R2

2K

C56

0.1uf

C57

0.1uf

R3

2K

R5

10

R7

4.7K

R6

4.7K

RNSMD4

10

8

1

7

6

2

5

3

4

U8

AL440

1

23

2

24

3

25

4

26

6

27

7

8

29

9

30

10

31

11

32

13

33

14

34

5

15

35

16

36

17

37

18

38

39

40

41

22

42

43

44

12

DI0

SDAEN

DI1

SCL

DI2

SDA

DI3

GND

DI4

/RESET

DI5

DI6

VDD

DI7

ORDY

WE

RRST

IE

RCK

WCK

GND

WRST

OE

VDD

IRDY

RE

PLRTY

DO7

TEST

DO6

AVDD

DO5

DO4

VDD

DO3

AGND

DO2

DO1

DO0

GND

Populate R2 or R3 to select

Control Singals polarity