PI6C182

Precision 1-10 Clock Buffer

3

PS8165D

07/19/04

Byte1: SDRAM Active/Inactive Register

(1 = enable, 0 = disable)

Bit

Pin

Description

7

27

SDRAM7 (Active/Inactive)

6

26

SDRAM6 (Active/Inactive)

5

23

SDRAM5 (Active/Inactive)

4

22

SDRAM4 (Active/Inactive)

3

NC (Initialize to 0)

2

NC (Initialize to 0)

1

NC (Initialize to 0)

0

NC (Initialize to 0)

Byte2: Optional Register for Possible Future

Requirements (1 = enable, 0 = disable)

Bit

Pin

Description

7

18

SDRAM9 (Active/Inactive)

6

11

SDRAM8 (Active/Inactive)

5

(Reserved)

4

(Reserved)

3

(Reserved)

2

(Reserved)

1

(Reserved)

0

(Reserved)

2-Wire I2C Control

output and test mode enable.

The PI6C182 is a slave receiver device. It can not be read back.

Sub addressing is not supported. All preceding bytes must be sent

in order to change one of the control bytes.

Every byte put on the SDATA line must be 8-bits long (MSB

first), followed by an acknowledge bit generated by the receiving

device.

During normal data transfers SDATAchanges only when SCLOCK

is LOW. Exceptions: AHIGH to LOW transition on SDATAwhile

SCLOCK is HIGH indicates a “start” condition. A LOW to HIGH

transition on SDATAwhile SCLOCK is HIGH is a “stop” condition

and indicates the end of a data transfer cycle.

Each data transfer is initiated with a start condition and ended with

a stop condition. The first byte after a start condition is always a

7-bit address byte followed by a read/write bit. (HIGH = read from

addressed device, LOW= write to addressed device). If the device’s

own address is detected, PI6C182 generates an acknowledge by

pulling SDATA line LOW during ninth clock pulse, then accepts

the following data bytes until another start or stop condition is

detected.

Following acknowledgement of the address byte (D2), two more

bytes must be sent:

1. “Command Code” byte

2. “Byte Count” byte.

Although the data bits on these two bytes are “don’t care,” they

must be sent and acknowledged.

Storage Temperature............................................................–65°C to +150°C

Ambient Temperature with Power Applied.............................–0°C to +70°C

3.3V Supply Voltage to Ground Potential ..............................–0.5V to +4.6V

DC Input Voltage....................................................................–0.5V to +4.6V

Note:

Stresses greater than those listed under MAXIMUM RAT-

INGS may cause permanent damage to the device. This is

a stress rating only and functional operation of the device

at these or any other conditions above those indicated in

the operational sections of this specification is not implied.

Exposure to absolute maximum rating conditions for ex-

tended periods may affect reliability.

Maximum Ratings

(Above which the useful life may be impaired. For user guidelines, not tested.)

Symbol

Parameter

Test Condidtion

Min.

Typ.

Max.

Units

Supply Current

BUF_IN = 0 MHz

2

mA

BUF_IN = 66.66 MHz

180

BUF_IN = 100.00 MHz

240

BUF_IN = 133.00 MHz

360