ICS726A IDT | Alldatasheet

Document overview

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Technical content

Features

  • Uses an inexpensive 12 to 36 MHz external crystal
  • Output frequency range of 12 to 36 MHz
  • On-chip VCXO with guaranteed pull range of ±115 ppm minimum
  • VCXO tuning voltage 0 to 3.3 V
  • Packaged in 6-pin TSOT
  • Available in Pb (lead) free package NOTE: EOL for non-green parts to occur on 5/13/10 per PDN U-09-01 Block Diagram Voltage Controlled Crystal Oscillator 12-36MHz Pullable Crystal VIN 12-36MHz VDD GND

12 TO 36 MHZ 6TSOT VCXO VCXO

IDT™ / ICS™ 12 TO 36 MHZ 6TSOT VCXO 2 ICS726A REV C 092409 Pin Assignment Pin Descriptions GND CLK VIN VDD X11 TSOT-23-6 Pin Number Pin Name Pin Type Pin Description 1 X2 Input Crystal connection. Connect to the external pullable crystal. 2 GND Power Connect to ground. 3 CLK Output VCXO CMOS level clock output at the frequency of the crystal. 4 VDD Power Connect to +3.3 V (0.01µf decoupling capacitor recommended). 5 VIN Input Voltage input to VCXO — 0 to 3.3 V analog input which controls the oscillation frequency of the VCXO. 6 XI Input Crystal connection. Connect to the external pullable crystal.

IDT™ / ICS™ 12 TO 36 MHZ 6TSOT VCXO 3 ICS726A REV C 092409 External Component Selection The ICS726A requires a minimum number of external components for proper operation. Decoupling Capacitor A decoupling capacitor of 0.01µF must be connected between VDD (pin 4) and GND (pin 2), as close to these pins as possible. For optimum device performance, the decoupling capacitor should be mounted on the component side of the PCB. Avoid the use of vias in the decoupling circuit. Series Termination Resistor When the PCB trace between the clock output (CLK, pin 3) and the load is over 1 inch, series termination should be used. To series terminate a 50Ω trace (a commonly used trace impedance) place a 33Ω resistor in series with the clock line, as close to the clock output pin as possible. The nominal impedance of the clock output is 20Ω. Quartz Crystal The ICS726A VCXO function consists of the external crystal and the integrated VCXO oscillator circuit. To assure the best system performance (frequency pull range) and reliability, a crystal device with the recommended parameters (shown below) must be used, and the layout guidelines discussed in the following section shown must be followed. The frequency of oscillation of a quartz crystal is determined by its “cut” and by the load capacitors connected to it. The ICS726A incorporates on-chip variable load capacitors that “pull” (change) the frequency of the crystal. The crystal specified for use with the ICS726A is designed to have zero frequency error when the total of on-chip + stray capacitance is 14 pF . Required Crystal Parameters: Nominal Frequency as required MHz Initial Accuracy at 25 ° C -20 min/+20 max ppm Temperature Stability - 30 min/+30 max ppm Aging, 1st year -5 min/+5 max ppm Aging, 10 years -20 min/+20 max ppm Operating Temp. Range, °C 0 min/+25 typ/+70 max or Operating Temp. Range, °C -40 min/+25 typ/+85 max Load Capacitance 10 pf Shunt Capacitance, C0 7 pF Max C0/C1 Ratio 270 Max Equivalent Series Resistance 35 Ω Max The third overtone mode of the crystal and all spurs must be >100 ppm distant from the 3x fundamental resonance measured with a physical load of 10 pF . The external crystal must be connected as close to the chip as possible and should be on the same side of the PCB as the ICS726A. There should be no vias between the crystal pins and the X1 and X2 device pins. There should be no signal traces underneath or close to the crystal. See application note MAN05. Crystal Tuning Load Capacitors The crystal traces should include pads for small fixed capacitors, one between X1 and ground, and another between X2 and ground. The need for these capacitors is determined at system prototype evaluation, and is influenced by the particular crystal used (manufacture and frequency) and by PCB layout. The typical required capacitor value is 1 to 4 pF . The procedure for determining the value of these capacitors can be found in application note MAN05.

IDT™ / ICS™ 12 TO 36 MHZ 6TSOT VCXO 4 ICS726A REV C 092409 Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the ICS726A. These ratings, which are standard values for IDT commercially rated parts, are stress ratings only. Functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical parameters are guaranteed only over the recommended operating temperature range. Recommended Operating Conditions VDD = 3.3 V ±5% , Ambient temperature 0 to +70° C, unless stated otherwise Item Rating Supply Voltage, VDD 7 V All Inputs and Outputs -0.5 V to VDD+0.5 V Ambient Operating Temperature 0 to +70 ° C Storage Temperature -65 to +150 ° C Soldering Temperature 260 ° C Parameter Min. Typ. Max. Units Ambient Operating Temperature 0 +70 ° C Power Supply Voltage (measured in respect to GND) +3.15 +3.45 V Reference crystal parameters Refer to page 3 Parameter Symbol Conditions Min. Typ. Max. Units Operating Voltage VDD 3.15 3.45 V Output High Voltage V OH IOH = -12 mA 2.4 V Output Low Voltage V OL IOL = 12 mA 0.4 V Output High Voltage (CMOS Level) VOH IOH = -4 mA VDD-0.4 V Operating Supply Current IDD Output = 12 MHz, no load 5m A Short Circuit Current I OS ±50 mA VIN, VCXO Control Voltage V IA 03 . 3 V

IDT™ / ICS™ 12 TO 36 MHZ 6TSOT VCXO 5 ICS726A REV C 092409 VDD = 3.3 V ±5%, Ambient Temperature 0 to +70° C, unless stated otherwise Note 1: External crystal device must conform with Pullable Crystal Specifications listed on page 3. Marking Diagrams (726AT) (726ATLF) Notes: 1. ‘26AT’ or ‘26AL ’ denotes part number. 2. “L ” denotes Pb (lead) free package. 3. Bottom marking: ‘####’ denotes last 4 digits of lot number Parameter Symbol Conditions Min. Typ. Max. Units Output Frequency F O 12 36 MHz Crystal Pullability, Note 2 FP 0V< VIN < 3.3 V, Note 1 ±115 ppm VCXO Gain VIN = VDD/2 ± 1 V, Note 1 140 ppm/V Output Rise Time t OR 0.8 to 2.0 V, CL=15 pF 0.8 1.5 ns Output Fall Time t OF 2.0 to 0.8 V, CL=15 pF 0.8 1.5 ns Output Clock Duty Cycle tD Measured at 1.4 V, CL=15 pF 40 50 60 % Maximum Output Jitter, short term tJ CL=15 pF 100 ps 26AT 26AL

IDT™ / ICS™ 12 TO 36 MHZ 6TSOT VCXO 6 ICS726A REV C 092409 Package Outline and Package Dimensions (6-pin TSOT) Package dimensions are kept current with JEDEC Publication No. 95

Ordering Information

*NOTE: EOL for non-green parts to occur on 5/13/10 per PDN U-09-01 “A” denotes revision designator (will not corrrelate with datasheet revision) Parts that are ordered with a "LF" suffix to the part number are the Pb-Free configuration and are RoHS compliant. While the information presented herein has been checked for both accuracy and reliability, Integrated Device Technology (IDT) assumes no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements are not recommended without additional processing by IDT. IDT reserves the right to change any circuitry or specifications without notice. IDT does not authorize or warrant any IDT product for use in life support devices or critical medical instruments. Part / Order Number Marking Shipping Packaging Package Temperature 726ATT* 26AT Tape and Reel 6-pin TSOT 0 to +70 ° C 726ATLFT 26AL Tape and Reel 6-pin TSOT 0 to +70 ° C Millimeters Symbol Min Max A — 1.00 A1 0.01 0.10 A2 0.84 0.90 b0 . 3 0 0 . 4 5 c0 . 1 2 0 . 2 0 D 2.90 BASIC E 2.80 BASIC E1 1.60 BASIC e 0.95 BASIC e1 1.90 BASIC L0 . 3 0 0 . 5 0 L1 0.60 REF . L2 0.25 BASIC θ 0° 8° aaa — 0.10

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