580G-01LF Integrated Device Technology (Idt), 580G-01LF Datasheet - Page 4

• Manufacturer Part Number: 580G-01LF
• Description: Clock Multiplexer 2-IN 16-Pin TSSOP Tube
• Manufacturer: Integrated Device Technology (Idt)

Specifications of 580G-01LF

• Package: 16TSSOP
• Configuration: 1 x 2:1
• Maximum Quiescent Current: 6(Typ) mA
• Operating Supply Voltage: 3.3 V

Device Operation
IDT™ / ICS™ GLITCH-FREE CLOCK MULITPLEXER
ICS580-01
GLITCH-FREE CLOCK MULITPLEXER
The ICS580-01 consists of a glitch free mux between INA and INB controlled by SELB. The device is designed to
switch between two clocks, whether running or not. In the first example, clocks are running on both INA and INB.
When SELB changes, the output clock goes low after three cycles of the output clock (nominally). The output then
stays low for three cycles of the new input clock (nominally) and then starts with the new input clock. This is shown
in Figure 1.
In the second example, one of the inputs was selected and running but has since stopped (either high or low). This
is indicated by either NO_INA or NO_INB going high depending on whether INA or INB has stopped. These signals
go high following a selectable time-out period after the clock has stopped. The timeout period is determined by the
DIV input in. The SELB pin is now changed to select the new input clock which is running. The output clock
immediately goes low and stays low for three cycles of the new input clock and then starts with the new input clock.
Figure 2 shows an example of this
Figure 2
Figure 1
NO_INA
CLK1, 2
CLK1, 2
SELB
SELB
INA
INB
INA
INB
Timeout
4
ICS580-01
CLOCK MULTIPLEXER
REV L 051310