The SY89838U is a low jitter, low skew, high-speed 1:8 fanout buffer with a unique, 2:1 differential input multiplexer (MUX) optimized for redundant source switchover applications. Unlike standard multiplexers, the SY89838U unique 2:1 Runt Pulse Eliminator (RPE) MUX prevents any short cycles or "runt" pulses during switchover. In addition, a unique fail-safe input protection prevents metastable conditions when the selected input clock fails to a DC voltage (voltage between the pins of the differential input drops below 200mV). The SY89838U distributes clock frequencies from 1kHz to 1.5GHz, guaranteed, over temperature and voltage. The differential input includes Micrel's unique, 3-pin input termination architecture that allows customers to interface to any differential signal (AC- or DC-coupled) as small as 200mV (400MvPP) without any level shifting or termination resistor networks in the signal path. The outputs are 350mV compatible LVDS with fast rise/fall times guaranteed to be less than 150ps.The SY89838U operates from a 2.5V ±5% supply and is guaranteed over the full industrial temperature range of -40°C to +85°C. For applications that require 800mV LVPECL outputs, consider the SY89837U. The SY89838U is part of Micrel's high-speed, Precision Edge® product line.
Additional Features
Selects between two clocks, and provides 8 precision, low skew LVDS output copies
2:1 MUX input provides a glitch-free, stable LVDS output
Guaranteed AC performance over temperature and supply voltage:
Wide operating frequency: 1kHz to >1.5GHz
<150ps tr/tf
<40ps output-to-output skew
Unique patent-pending input isolation design minimizes crosstalk
Fail-safe input prevents oscillation
Ultra-low jitter design:
150fs RMS phase jitter
<0.7psRMS MUX crosstalk-induced jitter
Unique patent-pending input termination and VT pin accepts DC- and AC-coupled inputs (CML, PECL, LVDS)
350mV LVDS output swing
Power supply 2.5V ±5%
-40°C to +85°C industrial temperature range
Available in 32-pin (5mm x 5mm) QFN package
The SY89838U is a low jitter, low skew, high-speed 1:8 fanout buffer with a unique, 2:1 differential input multiplexer (MUX) optimized for redundant source switchover applications. Unlike standard multiplexers, the SY89838U unique 2:1 Runt Pulse Eliminator (RPE) MUX prevents any short cycles or "runt" pulses during switchover. In addition, a unique fail-safe input protection prevents metastable conditions when the selected input clock fails to a DC voltage (voltage between the pins of the differential input drops below 200mV). The SY89838U distributes clock frequencies from 1kHz to 1.5GHz, guaranteed, over temperature and voltage.
The differential input includes Micrel's unique, 3-pin input termination architecture that allows customers to interface to any differential signal (AC- or DC-coupled) as small as 200mV (400MvPP) without any level shifting or termination resistor networks in the signal path. The outputs are 350mV compatible LVDS with fast rise/fall times guaranteed to be less than 150ps.The SY89838U operates from a 2.5V ±5% supply and is guaranteed over the full industrial temperature range of -40°C to +85°C. For applications that require 800mV LVPECL outputs, consider the SY89837U. The SY89838U is part of Micrel's high-speed, Precision Edge® product line.
Additional Features
- Selects between two clocks, and provides 8 precision, low skew LVDS output copies
- 2:1 MUX input provides a glitch-free, stable LVDS output
- Guaranteed AC performance over temperature and supply voltage:
- Wide operating frequency: 1kHz to >1.5GHz
- <150ps tr/tf
- <40ps output-to-output skew
- Unique patent-pending input isolation design minimizes crosstalk
- Fail-safe input prevents oscillation
- Ultra-low jitter design:
- 150fs RMS phase jitter
- <0.7psRMS MUX crosstalk-induced jitter
- Unique patent-pending input termination and VT pin accepts DC- and AC-coupled inputs (CML, PECL, LVDS)
- 350mV LVDS output swing
- Power supply 2.5V ±5%
- -40°C to +85°C industrial temperature range
- Available in 32-pin (5mm x 5mm) QFN package
