PI6C182B

Precision 1-10 Clock Buffer

2

PS8465C

09/07/05

Pin Description

Pin

Symbol

Type

Qty

Description

2, 3, 6, 7

SDRAM[0-3]

O

4

SDRAM Byte 0 clock output

22, 23, 26, 27

SDRAM[4-7]

O

4

SDRAM Byte 1 clock output

11, 18

SDRAM[8-9]

O

2

SDRAM Byte 2 clock output

9

BUF_IN

I

1

Input for 1-20 buffer

20

OE

I

1

Hi-Z states all outputs when held LOW. Has a >100kΩ internal pull-up

resistor.

14

SDATA

I/O

1

15

SCLOCK

I/O

1

1, 5, 10, 19, 24,

28

VDD[0-5]

Power

6

3.3V power supply for SDRAM buffer

4, 8, 12, 17, 21,

25

VSS[0-5]

Ground

6

Ground for SDRAM buffers

13

VDDIIC

Power

1

16

VSSIIC

Ground

1

OE Functionality

OE

SDRAM[0-9]

Notes

0

Hi-Z

1

1

BUF_IN

2

A6

A5

A4

A3

A2

A1

A0

R/W

1

1

0

1

0

0

1

0

Notes:

1. Used for test purposes only

2. Buffers are non-inverting

Serial Configuration Map

Byte0: SDRAM Active/Inactive Register

(1 = enable, 0 = disable)

Bit

Pin

Description

7

NC (Initialize to 0)

6

NC (Initialize to 0)

5

NC (Initialize to 0)

4

NC (Initialize to 0)

3

7

SDRAM3 (Active/Inactive)

2

6

SDRAM2 (Active/Inactive)

1

3

SDRAM1 (Active/Inactive)

0

2

SDRAM0 (Active/Inactive)

Note:

1. Inactive means outputs are held LOW and are disabled from

switching