SY89845U Series

Catalog

MULTIPLEXER 1-ELEMENT CMOS 2-IN 24-PIN QFN TRAY

Part	Mounting Type	Circuit [custom]	Circuit [custom]	Type	Voltage - Supply [Max]	Voltage - Supply [Min]	Package / Case	Independent Circuits	Voltage Supply Source	Operating Temperature [Max]	Operating Temperature [Min]	Supplier Device Package
Microchip Technology SY89845UMG
Microchip Technology SY89845UMG	Surface Mount	2:1	1	Multiplexer	2.625 V, 3.6 V	2.375 V, 3 V	24-MLF®, 24-VFQFN Exposed Pad	1	Single Supply	85 °C	-40 °C	24-MLF® (4x4)

Catalog

Key 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

Description

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.