SY89843UMG TR Micrel Inc, SY89843UMG TR Datasheet
SY89843UMG TR
Specifications of SY89843UMG TR
SY89843UMGTR
Related parts for SY89843UMG TR
SY89843UMG TR Summary of contents
Page 1
... All support documentation can be found on Micrel’s web site at: www.micrel.com. Precision Edge is a registered trademark of Micrel, Inc. Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com May 2007 SY89843U ...
Page 2
Micrel, Inc. Typical Application May 2007 Simplified Example Illustrating RPE (Runt Pulse Elimination) Circuit when Primary Clock Fails 2 hbwhelp@micrel.com SY89843U M9999-052207-B or (408) 955-1690 ...
Page 3
Micrel, Inc. (1) Ordering Information Part Number Package Type SY89843UMG (2) SY89843UMGTR Notes: 1. Contact factory for die availability. Dice are guaranteed Tape and Reel. Pin Configuration May 2007 Operating Range QFN-24 Industrial QFN-24 Industrial = 25°C, ...
Page 4
Micrel, Inc. Pin Description Pin Number Pin Name 5, 2 IN0, /IN0, 23, 20 IN1, /IN1 4, 22 VT0, VT1 VREF-AC0 3, 21 VREF-AC1 15 SEL 10, VCC 13, 19 Q0, /Q0 11, 12 ...
Page 5
Micrel, Inc. Absolute Maximum Ratings Supply Voltage (V ) .............................................. –0.5V to +4.0V CC Input Voltage (V ) ...................................................... –0. LVPECL Output Current (I ) OUT Continuous .................................................................. ±50mA Surge ........................................................................ ±100mA Termination Current Source/Sink Current on ...
Page 6
Micrel, Inc. LVPECL Outputs DC Electrical Characteristics V = 2.5V ±5% or 3.3V ±10 Symbol Parameter V Output HIGH Voltage Output Low Voltage Output Voltage Swing OUT ...
Page 7
Micrel, Inc. AC Electrical Characteristics V = 2.5V ±5% or 3.3V ±10 Symbol Parameter f Maximum Operating Frequency MAX t Differential Propagation Delay In-to Differential Propagation Delay pd Tempco Temperature Coefficient t Output-to-Output Skew SKEW Part-to-Part ...
Page 8
Micrel, Inc. Functional Description RPE MUX and Fail-Safe Input The SY89843U is optimized for clock switchover applications where switching from one clock to another clock without runt pulses (short cycles) is required. It features two unique circuits: Runt-Pulse Eliminator (RPE) ...
Page 9
Micrel, Inc. Case #2 Input Clock Failure: Switching from a selected clock stuck HIGH to a valid clock (RPE enabled). If CLK1 fails HIGH before the RPE MUX selects CLK2 (using the SEL pin), then the switchover will occur in ...
Page 10
Micrel, Inc. Case #3 Input Clock Failure: Switching from a selected clock stuck Low to a valid clock (RPE enabled). If CLK1 fails LOW before the RPE MUX selects CLK2 (using the SEL pin), the switchover will occur in two ...
Page 11
Micrel, Inc. Case #4 Input Clock Failure: Switching from the selected clock input stuck in an undetermined state to a valid clock input (RPE enabled). If CLK1 fails to an undetermined state (e.g., amplitude falls below the 100mV (V single-ended ...
Page 12
Micrel, Inc. Typical Operating Characteristics ≥ 400mV V = 3.3V, GND = 0V May 2007 ≤ 300ps 50Ω –2V SY89843U = 25°C, unless ...
Page 13
Micrel, Inc. Functional Characteristics ≥ 400mV V = 3.3V, GND = 0V May 2007 ≤ 300ps 50Ω –2V SY89843U = 25°C, unless otherwise ...
Page 14
Micrel, Inc. Singled-Ended and Differential Swings Figure 1a. Single-Ended Voltage Swing Input and Output Stages Figure 2a. Simplified Differential Input Stage May 2007 Figure 1b. Differential Voltage Swing Figure 2b. Simplified LVPECL Output Stage 14 hbwhelp@micrel.com SY89843U M9999-052207-B or (408) ...
Page 15
Micrel, Inc. Input Interface Applications Figure 3a. LVPECL Interface (DC-Coupled) Figure 3d. CML Interface (AC-Coupled) May 2007 Figure 3b. LVPECL Interface (AC-Coupled) Figure 3e. LVDS Interface 15 SY89843U Option: may connect Figure 3c. CML Interface ...
Page 16
Micrel, Inc. LVPECL Output Interface Applications LVPECL has a high input impedance, a very low output impedance (open emitter), and a small signal swing which results in low EMI. LVPECL is ideal for driving 50Ω and 100Ω controlled impedance transmission ...
Page 17
Micrel, Inc. Product Information MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http:/www.micrel.com The information furnished by Micrel in this data sheet is believed to be accurate and reliable. ...