Pin Number Pin Name
1 ICLK Reference Input Clock; 10 MHz.
2 NC No Connect.
3 NC No Connect.
4 NC No Connect.
5 VDD Voltage Supply; 3.3V.
6 VSS Ground.
7 NC No Connect
8 XIN Pullable Crystal Input; 10 MHz.
9 XOUT Pullable Crystal Output; 10 MHz.
10 SAFE High = reference ICLK within range, Low = reference ICLK out of range.
11 VSS Ground.
12 VDD Voltage Supply; 3.3V.
13 NC No Connect.
14 NC No Connect.
15 CLKA Clock Output. 100 MHz
16 NC No Connect.
Input Frequency Range
Reference Input Clock: 10 MHz
Crystal: 10-MHz pullable Crystal per Cypress Specification
CY26049-22 is a FailSafe frequency synthesizer with a
reference clock input and 100-MHz output. The device
www.DparotavSidheeset4Uan.comoptimum solution for applications where
continuous operation is required in the event of a primary clock
failure. The continuous, glitch-free operation is achieved by
using a DCXO, which serves as a primary clock source. The
FailSafe control circuit synchronizes the DCXO oscillator with
the reference as long as the reference is within the pull range
of the crystal.
In the event of a reference clock failure the DCXO maintains
the last frequency of the reference clock. The unique feature
of the CY26049-22 is that the DCXO is, in fact, the primary
clocking source. When the reference clock is restored, the
DCXO automatically resynchronizes to the reference. The
status of the reference clock input, as detected by the
CY26049-22, is reported by the SAFE pin.
Document #: 38-07730 Rev. **
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