IDT5V7855-DPK REVISION A MARCH 11, 2010

7

©2010 Integrated Device Technology, Inc.

IDT5V7855 Data Sheet

EEPROM PROGRAMMABLE PLL DIE FOR LVCMOS CRYSTAL OSCILLATOR

The procedure to program the registers and control bits without writing to the EEPROM is as follows:

1.

Set CONT and OUT to 0.0 volts with no power applied.

2.

Apply power, wait for 1ms.

3.

Apply four clock pulses on OUT to enter serial programming mode (see timing diagram below).

4.

Enter serial data (bit order as described above) via the CONT pin, with a positive pulse on OUT pin for each data bit.

NOTE: CONT must only change while OUT is LOW to write the data properly.

5.

To activate the registers and exit serial programming mode, while OUT is held LOW, set CONT HIGH.

After 1µs with CONT still HIGH, set OUT HIGH. After 1µs with OUT still HIGH, set CONT LOW.

6.

Remove the programming voltage from OUT pin.

7.

Enable the output by setting CONT HIGH.

Figure 2. Timing Diagram

3F. Timing/Voltage Requirements Table

Symbol

Parameter

Minimum

Maximum

Units

Enter Serial Data Mode

1

ms

Data & Clock Timing

1

µs

Supply Voltage

2.2

3.6

V