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SY89845U

Status: In Production

Features:

  • Selects between two sources, and provides a glitch-free, stable CML output
  • Wide operating frequency: 1kHz to >1.5GHz
  • <840ps In-to-Out tpd
  • <80ps tr/tf
  • Unique, patent-pending input isolation design minimizes crosstalk
  • Fail-Safe Input prevents oscillations
  • <1psRMS random jitter
  • <1psRMS cycle-to-cycle jitter
  • <10psPP total jitter (clock)
  • <0.7psRMS MUX crosstalk induced jitter
  • Unique patented input termination and VT pin accepts DC- and AC-coupled inputs (CML, PECL, LVDS)
  • 400mV CML output swing
  • 2.5V ±5% or 3.3V ±10% supply voltage
  • -40°C to +85°C industrial temperature range
  • Available in 24-pin (4mm x 4mm) QFN package
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Overview
Documents
Development Environment
RoHS Information
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Device Overview

Summary

The SY89845U is a low jitter CML, 2:1 differential input multiplexer (MUX) optimized for redundant source switchover applications. Unlike standard multiplexers, the SY89845U 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 100mV).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 100mV (200mVpp) without any level shifting or termination resistor networks in the signal path. The outputs are 400mV CML with fast rise/fall times guaranteed to be less than 80ps.The SY89845U operates from a 2.5V ±5% or 3.3V ±10% supply and is guaranteed over the full industrial temperature range of -40°C to +85°C. The SY89845U is part of Micrel's high-speed, Precision Edge® product line.

Additional Features
    • Selects between two sources, and provides a glitch-free, stable CML output
    • Guaranteed AC performance over temperature and supply voltage:
      • Wide operating frequency: 1kHz to >1.5GHz
      • <840ps In-to-Out tpd
      • <80ps tr/tf
    • Unique, patent-pending input isolation design minimizes crosstalk
    • Fail-Safe Input prevents oscillations
    • Ultra-low jitter design:
      • <1psRMS random jitter
    • <1psRMS cycle-to-cycle jitter
    • <10psPP total jitter (clock)
    • <0.7psRMS MUX crosstalk induced jitter
    • Unique patented input termination and VT pin accepts DC- and AC-coupled inputs (CML, PECL, LVDS)
    • 400mV CML output swing
    • 2.5V ±5% or 3.3V ±10% supply voltage
    • -40°C to +85°C industrial temperature range
    • Available in 24-pin (4mm x 4mm) QFN package
Parametrics
Name
Value
Product Type
Multiplexers
Description
2:02
Input
ANY
Output
CML
Supply Voltage
2.5/3.3V
Max Freq (GHz)
2
Max Prop Delay (ps)
840
Icc (mA)
110
Max Within Device Skew (ps)
20
OE
False
RPE
True
FSI
True
Input Mux
False
Input EQ
False
Channels
Single
Output Type
CML
Output Voltage
2.5/3.3V

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RoHS Information

Part Number
Device Weight (g)
Shipping Weight (grams)
Lead Count
Package Type
Package Width
Solder Composition
JEDEC Indicator
RoHS
China EFUP
SY89845UMG
0.042200
0.074667
24
VQFN
4x4x0.9mm
NiPdAu
e4
To see a complete listing of RoHS data for this device, please Click here
Shipping Weight = Device Weight + Packing Material weight. Please contact sales office if device weight is not available.

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