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Manufacturer Part #


SY89841U Series Precision LVDS Runt Pulse Eliminator 2:1 Multiplexer MLF-16

ECAD Model:
Mfr. Name: Microchip
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Product Specification Section
Technical Attributes
Attributes Table
Type: Multiplexer
Configuration: 1 x 2:1
No of Channels: 2
Supply Voltage: 2.375V to 2.625V
Package Style:  MLF-16
Mounting Method: Surface Mount
Features & Applications

The SY89841UMG TR is a low jitter LVDS, 2:1 input multiplexer (MUX) optimized for redundant source switch over applications. Unlike standard multiplexers, the SY89841U 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 100 mV).

The differential input includes Micrel’s unique, 3-pin input termination architecture that allows customers to interface to any differential signal (AC- or DCcoupled) as small as 100 mV (200 mVpp) without any level shifting or termination resistor networks in the signal path. The outputs are 350 mV, LVDS with fast rise/fall times guaranteed to be less than 150 ps. The SY89841U operates from a 2.5 V ±5% supply and is guaranteed over the full industrial temperature range of –40°C to +85°C. The SY89841U is part of Micrel’s high-speed, Precision Edge® product line.

Key Features:

  • Selects between two sources, and provides a glitch-free, stable LVDS output.
  • Guaranteed AC performance over temperature and supply voltage:
  • wide operating frequency: 1 kHz to >1.5 GHz.
    • <870 ps In-to-Out tpd.
    • <150 ps tr/tf.
  • Unique patent-pending input isolation design minimizes crosstalk.
  • Fail-safe input prevents oscillations..
  • Ultra-low jitter design:
    • <1 psrms random jitter.
    • <1 psrms cycle-to-cycle jitter.
    • <10 pspp total jitter (clock).
    • <0.7 psrms MUX crosstalk induced jitter.
  • Unique patent-pending input termination and VT pin accepts DC-coupled and AC-coupled inputs (CML,
  • ECL, LVDS).
  • 350 mV LVDS output swing.
  • 2.5 V +5% power supply.
  • –40°C to +85°C industrial temperature range.
  • Available in 16-pin (3 mm x 3 mm) MLF™ package.


  • Redundant clock switchover.
  • Fail-safe clock protection.
Pricing Section
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Factory Lead Time:
8 Weeks
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Multiple Of:
Web Price
Product Variant Information section