RMQCHA3636DGBA, RMQCHA3618DGBA

Preliminary Datasheet

R10DS0240EJ0002 Rev.0.02

Page 9 of 29

Dec. 01, 2014

Power-up and Initialization Sequence

- Then execute either one of the following three sequences.

1. Single Clock Mode

- Drive /DOFF high (/DOFF can be tied high from the start).

- Then provide stable clocks (K, /K) for at least 20 us.

2. PLL Off Mode (/DOFF tied low)

- In the "NOP and setup stage", provide stable clocks (K, /K) for at least 20 us.

PLL Constraints

1.

These chips use the PLL. The clock input should have low phase jitter which is specified as tKC var.

2.

The lower end of the frequency at which the PLL can operate is 250 MHz.

(Please refer to AC Characteristics table for detail.)

3.

When the operating frequency is changed or /DOFF level is changed, setup cycles are required again.

Status

Power Up &

Unstable Stage

NOP &

Set-up Stage

Normal

Operation

V

DD

SET-UP Cycle

V

DDQ

V

REF

/DOFF

K, /K

Fix High (=Vddq)