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PI6C918/919
3.3V Precision Clock Generator
Features * * * * * * * * * * No external capacitors (919 only) Excellent signal quality Very low jitter Precise frequencies Minimal undershoot, ringback or overshoot Nearly perfect 50% duty cycle Four selectable clock frequencies Operates at Vcc = 3.3V Output may be disabled to save power Small 150-mil wide SOIC -8 (W8) package saves board area Description
The PI6C918 and PI6C919 are high-precision, low-voltage general-purpose clock generators that reach a maximum output frequency of 120 MHz. These devices use an external low-cost crystal to generate very accurate and stable system clocks. These frequency synthesizers include a crystal oscillator, a programmable PLL and an output buffer. Any one of four different output frequencies can be selected via two select pins (S0, S1). The frequency multipliers are: 2, 4, 5, and 7. The PI6C919 has on-chip capacitors, eliminating the need for external capacitors at the X1, X2 pins. This reduces overall parts count and board area, and increases reliability. The OE (output enable) pin may be pulled down to disable the output buffer and save system power. The small surface-mount SOIC-8 package is ideal for compact portable equipment applications.
1 2 3 4 8
Pin Configuration
OE X1 X2 GND
Vcc S1 S0 CLK
Pin Description
Pin Name Pin # I/O S0 6 I S1 7 I X1 2 C X2 3 C CLK 5O OE 1 I
Clock (using 22.1 MHz Xtal) 44.2 88.4 110.5 -
8-PIN W8
7 6 5
Output CLK Frequency Selection
Selection S 1, S 0 00 01 10 11 Clock Clock Clock (using10 (using 16.6 (using 20 MHz Xtal) MHz Xtal) MHz Xtal) - 40(1) 50(1) 70(1) 33.3(1) 66.6(1) 83 116 40 80(1) 100(1) -
Description Select 0, internal pull-up Select 1, internal pull-up Crystal or clock input, 8 to 23 MHz Crystal connection or no connect Clock output OE = 1 Enable CLK output OE = 0 Disable CLK output
Note: 1. I = Input, O = Output, C = Crystal
N/M(2) 2 4 5 7
Product Speed Grades
Part No. PI6C918/919 PI6C918A/919A PI6C918B/919B Max CLK Output Freq. 80 MHz 100 MHz 120 MHz Max VCO Frequency 160 MHz 200 MHz 240 MHz
Notes: 1. Indicates popular target frequencies. 2. The ratio of N/M may be changed by mask option.
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PS7038B
09/08/97
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI6C918/919 3.3V Precision Clock Generator
Maximum Ratings
Storage Temperature ................................................................. -65C to +150C Ambient Temperature with Power Applied .................................... 0C to +70C Supply Voltage to Ground Potential (Inputs & Vcc Only) .......... -0.5V to +7.0V Supply Voltage to Ground Potential (Outputs & D/O Only) ....... -0.5V to +7.0V DC Input Voltage ......................................................................... -0.5V to +7.0V DC Output Current ................................................................................... 120 mA Power Dissipation ......................................................................................... 0.5W Note: Stresses greater than those listed under MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
DC Electrical Characteristics
Operating Range, VCC = 3.3V 10% (918/919/918A/919A). Vcc = 3.3V 5% (918B/919B), Temperature 0C to +70C
Symbol VOH VOL VIH VIL VIH VIL ICC RL RFB
Description Output HIGH Voltage Output LOW Voltage Select Input HIGH Voltage Select Input LOW Voltage Select Input HIGH Current Select Input LOW Current Supply Current X1, X2 Negative Resistance On- chip X1, X2 Internal Feedback Resistance
Test Conditions Vcc = Min., VIN = VIH or VIL VOH = - 8mA VOL = 8mA
Min. VCC - 0.4 2.0
Typ. 10 - 2,000 -
Max. 0.4
Units
V 0.8 5 - 10 20 A mA k - 1,000 227
VCC = 5V VCC = Max., VIN = VCC VCC = Max., VIN = 0V VCC = Max., CLK frequency = 40 MHz
Note: 1. There is no guarantee that on-chip capacitance eliminates the need for external capacitors.
AC Electrical Characteristics
Operating Range, VCC = 3.3V 10% (918/919/918A/919A). Vcc = 3.3V 5% (918B/919B), Temperature 0C to +70C Symbol dT Tr, Tf tPU FXTAL Tj1s Description Duty Cycle, Rise/Fall Time Power-up Time(2) Crystal Input Frequency One Sigma Jitter 918/918A/919/919A 918B/919B fVCO 60 MHz Test Conditions(1) VTH = 1.4V 20% and 80% Vcc Min. 45 -- -- 10 10 -- Typ. 50 -- -- -- -- -- Max. 55 3 10 20 24 60 ps Units % ns ms MHz
Note: 1. Test load of 15 pF, 2-inch trace 2. Time from when the power supply reaches 90% until locked clock output waveform is reached.
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PS7038B
09/08/97
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI6C918/919 3.3V Precision Clock Generator
External Circuit
Crystal Specifications
It is the customer's responsibility to procure the prototype and production crystals directly from crystal vendors.
Typical Characte ris tic(1) Frequency, F
Value 18.43200 MHz nominal
Frequency Tolerance at 25 C 50 ppm
Notes: a. Locate crystal as close to X1, X2 pins as possible. b. Connect a 0.1 F bypass capacitor at Vcc (Pin 8).
Frequency Stability vs. Temperature vs. Aging Oscillation Mode Calibration Mode Load Capacitance, CL
35 ppm (0C to 70C) 15 ppm/4 years Fundamental Parallel resonant 20 pF, Fundamental 7 pF max., Fundamental 50 Typical 1m Typical 0 to 70C - 40 to 85C
Ordering Information
Part No. PI6C918W PI6C918AW PI6C918BW PI6C919W PI6C919AW PI6C919BW M ax. Fre q. 80MHz 100MHz 120MHz Narrow SOIC- 8 80MHz 100MHz 120MHz Package
Shunt Capacitance, CO Series Resistance, R1 Drive Level Operating Temperature Storage Temperature
Pericom Semiconductor Corporation 2380 Bering Drive * San Jose, CA 95131 * 1-800-435-2336 * Fax (408) 435-1100 * http://www.pericom.com
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PS7038B 09/08/97

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