Broadcom BCM7405 - Table 1-39: Electrical Specifications; Crystal Requirements

2/24/2008 9T6WP
Preliminary Hardware Data Module BCM7405
06/29/07 Crystal Requirements
Broadcom Corporation
Document 7405-1HDM00-R Crystal Requirements Page 1-169
CRYSTAL REQUIREMENTS
The following lists are the known crystal and clock input requirements and constraints for the BCM7405 device.
3
RD
OVERTONE CRYSTAL OSCILLATOR
The 3
rd
overtone crystal oscillator uses a 54-MHz crystal operating at the third overtone to generate the internal clock
required for the BCM7405.
Table 1-39: Electrical Specifications
Parameter Symbol Comment Min. Typ. Max. Unit
Operating Conditions
Supply voltage VDD1p2 1.2V supply 1.1 1.2 1.3 V
VDD2p5 2.5V supply 2.25 2.5 2.75 V
Operating temperature TEMP Die temperature 0 – 125
o
C
Jitter – RMS jitter – 2 – ps
– Peak-to-peak jitter – 12 – ps
Crystal Requirements
Package – HC-49/U – – – –
Tolerance Tol
@25
o
C
–30 – 30 ppm
Stability – – –30 – 30 ppm
Load LD parallel resonant 54 MHz – 10 – pF
Equivalent Series Res. ESR – – – 40 ohm
Drive Level – – 0.5 – – mW