SCG2560 Datasheet, PDF (1/12 Pages) Connor-Winfield Corporation – Synchronous Clock Generator

2111 Comprehensive Drive
Aurora, Illinois 60505
Phone: [phone]
Fax: [phone]
www.conwin.com
SCG2560
Synchronous Clock
Generator
US Headquarters:
630-851-4722
European Headquarters:
[phone]
General Description
The SCG2560 is a mixed-signal phase lock loop
generating CMOS outputs from an intrinsically low jitter
voltage controlled crystal oscillator. The SCG2560 is
based on Connor-Winfield’s SCG2500 series product line.
The SCG2560 can lock to one of two possible
reference inputs at 25 MHz that are selectable using one
input select pin. The SCG2560 has an improved filter
compared to the SCG2500. The new filter allows the
SCG2560 to more closely track the selected input
reference and lowers switching MTIEs.
The SCG2560 provides 3 alarm outputs, Loss of
Reference A, (LOR A) Loss of Reference B, (LOR B), and
Loss of Lock, (LOL) as compared to the SCG2500’s
combined alarms. LOL alarm is active when the phase
error exceeds 1us. LOR A and LOR B independently
monitor the input references. If Both references are lost
the unit will go into Free Run automatically. When both
references are lost, the unit should be forced into Free Run
(pin 5 = 1). LOR A and LOR B can then be monitored until
the references return. Refer to Table 5 for more
operational details.
The reference output at 25 MHz is derived from the
oscillator output. Phase alignment of the reference output
to the input cannot be guaranteed with dual input units.
The package maximum dimensions are .780” x .830” x
.350” on a six layer FR4 board with surface mount pins.
Parts are assembled using high temperature solder to
withstand surface mount reflow processes.
Tri-State is not available with this model.
Features
• Commercial Temperature Range
(0°- 70°C)
• Phase Locked Output Frequency
Control
• Intrinsically Low Jitter Crystal
Oscillator
• Two Selectable References @ 25 MHz
• Hitless Reference Switching
• 2 Independent Reference Monitors
• LOL Alarm Output
• Force Free Run Function
• Automatic Free Run Operation upon
loss of both references
• Input Duty Cycle Tolerant
• 3.3 Volt Power Supply
• Small Size: 0.78” x 0.83” x 0.35”
maximum
• Surface Mount, DIL Package
Quick Overview
Ref_In
Osc_Out
25 MHz
125 MHz
Ref_Out
25 MHz