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PS8466

05/03/00

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PI6C185-01B

Precision 1-5 Clock Buffer

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The I

output and test mode enable.

The PI6C185-01B, a slave receiver device, cannot be read back.

Sub addressing is not supported. To change one of the control

bytes, all preceding bytes must be sent

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 SDATA changes only when SCLK is

LOW. Exceptions: A HIGH to LOW transition on SDATA while

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

transition on SDATA while SCLK 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, PI6C185-01B 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 (0D2H), 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.

StorageTemperature ...................................... –65°Cto+150°C

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

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

DCInputVoltage .............................................. –0.5Vto+4.6V

Note:

Stresses greater than those listed under MAXIMUM RATINGS

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 extended periods may affect reliability.

Maximum Ratings

(Above which the useful life may be impaired.

For user guidelines, not tested.)