ICS8538-31 Datasheet, PDF (3/14 Pages) Integrated Device Technology – LOW SKEW, 1-TO-8, CRYSTAL OSCILLATOR/LVCMOS-TO-3.3V LVPECL FANOUT BUFFER

ICS8538-31
LOW SKEW, 1-TO-8, CRYSTAL OSCILLATOR/LVCMOS-TO-3.3V LVPECL FANOUT BUFFER
Function Tables
Table 3A. Control Input Function Table
Inputs
CLK_EN
CLK_SEL
Selected Source
0
0
CLK
0
1
XTAL_IN, XTAL_OUT
1
0
CLK
1
1
XTAL_IN, XTAL_OUT
Outputs
Q0:Q7
nQ0:nQ7
Disabled; Low
Disabled; High
Disabled; Low
Disabled; High
Enabled
Enabled
Enabled
Enabled
After CLK_EN switches, the clock outputs are disabled or enabled following a rising and falling input clock or crystal oscillator edge as
shown in Figure 1. In the active mode, the state of the outputs are a function of the CLK input as described in Table 3B.
CLK
CLK_EN
Disabled
Enabled
nQ0:nQ7
Q0:Q7
Figure 1. CLK_EN Timing Diagram
Table 3B. Clock Input Function Table
Inputs
Outputs
CLK
Q0:Q7
nQ0:nQ7
0
LOW
HIGH
1
HIGH
LOW
IDT™ / ICS™ LVPECL FANOUT BUFFER
3
ICS8538BG-31 REV. B FEBRUARY 5, 2008