Broadcom BCM7405 - Figure 1-53: Example: Vendor (TXC) Part Number for 3 OT Crystal: 7 EA0000023; Rd Overtone Crystal Oscillator; Table 1-40: SATA Crystal Electrical Characteristics

2/24/2008 9T6WP
BCM7405 Preliminary Hardware Data Module
Crystal Requirements 06/29/07
Broadcom Corporation
Page 1-170 Crystal Requirements Document 7405-1HDM00-R
EXTERNAL COMPONENTS
An external filter is required for the differential oscillator to operate in its 3
rd
Overtone mode.
The required board components for proper 3
rd
overtone crystal oscillator operation: Inductors - 10% tolerance; Capacitors -
5% tolerance; and Resistors - 1% tolerance.
Figure 1-53: Example: Vendor (TXC) Part Number for 3OT Crystal: 7EA0000023
SATA CRYSTAL
The following table describes the parameters for the SATA crystal. The SATA crystal is required for the operation of the
SATA core—if this core is not required for a particular application, this crystal does not need to be installed.
Example: Vendor (Ecliptek) Part Number for SATA crystal: E13C4D1F-100MHz
Table 1-40: SATA Crystal Electrical Characteristics
Parameter Symbol Comment Min. Typ. Max. Unit
Reference frequency Fref – – 100 – MHz
Tolerance Tol T = 25C -50 – +50 ppm
Stability over temperature – 0 to 70 C -50 – +50 ppm
Duty cycle Tduty – 45 – 55 %
Rise time Trise 20% to 80% – 300 600 ps
Fall time Tfall 20% to 80% – 300 600 ps
Jitter Jp-p Peak to Peak – 0.7 1 ps
Input low level Vil – 1.6 1.45 1.3 V
Input high level Vih – 1.9 2.1 2.4 V
Equivalent series resistor ESR – – – 40 ohm
Drive level – – – –1mW
External Filter
R
E
= 600 L
E
= 2.7 C
E
= 33 pF
DIFFOSC_65LP
XTALP
XTALN
54 MHz
3
rd
OT Crystal
(parallel resonant with 10 pF load
cap, ESR < 40 )
C
L
= 8.2 pF
R
E
C
E
L
E
C
L
= 8.2 pF
22
Ω
Ω
22
Ω
μ
H