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MB88155 Dataheets PDF



Part Number MB88155
Manufacturers Fujitsu Media Devices
Logo Fujitsu Media Devices
Description Spread Spectrum Clock Generator
Datasheet MB88155 DatasheetMB88155 Datasheet (PDF)

www.DataSheet4U.com FUJITSU SEMICONDUCTOR DATA SHEET DS04-29119-1E Spread Spectrum Clock Generator MB88155 ■ DESCRIPTION MB88155 is a clock generator for EMI (Electro Magnetic Interference) reduction. The peak of unnecessary radiation noise (EMI) can be attenuated by making the oscillation frequency slightly modulate periodically with the internal modulator. For modulation, the MB88155 supports both center-spreading and down-spreading. It has a non-modulated output pin (REFOUT) as well as a .

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www.DataSheet4U.com FUJITSU SEMICONDUCTOR DATA SHEET DS04-29119-1E Spread Spectrum Clock Generator MB88155 ■ DESCRIPTION MB88155 is a clock generator for EMI (Electro Magnetic Interference) reduction. The peak of unnecessary radiation noise (EMI) can be attenuated by making the oscillation frequency slightly modulate periodically with the internal modulator. For modulation, the MB88155 supports both center-spreading and down-spreading. It has a non-modulated output pin (REFOUT) as well as a modulated output pin (CKOUT) . ■ FEATURES • Input frequency : • • • • 12.5 MHz to 50 MHz (Multiplied by 1) 12.5 MHz to 20 MHz (Multiplied by 4) Output frequency : CKOUT 12.5 MHz to 80 MHz REFOUT The same as input frequency (not multiplied) Modulation rate : ± 0.5%, ± 1.0% (center spread) , − 1.0%, − 2.0% (Down spread) Equipped with oscillation circuit : range of oscillation 12.5 MHz to 40 MHz (Fundamental oscillation) 40 MHz to 48 MHz (3rd overtone) Modulation clock output Duty : 40% to 60% (Continued) ■ PACKAGE 8-pin plastic TSSOP (FPT-8P-M05) MB88155 (Continued) • Modulation clock cycle − cycle jitter : MB88155-1xx 12.5 MHz to 20 MHz less than 150 ps MB88155-1xx 20 MHz to 50 MHz less than 100 ps MB88155-4xx less than 200 ps • Low current consumption by CMOS process : 5 mA (24 MHz : Typ-sample, no load) • Power supply voltage : 3.3 V ± 0.3 V • Operating temperature : − 40 °C to + 85 °C • Package : 8-pin plastic TSSOP 2 MB88155 ■ PRODUCT LINEUP The MB88155 is available in different models : 2 models different in multiplier ( × 1 and × 4) , 2 in modulation type (center-spreading and down-spreading) , 2 in input frequency range at a multiplier of 1 (12.5 MHz to 25 MHz and 25 MHz to 50 MHz) , and 1 in input frequency range at a multiplier of 4 (12.5 MHz to 20 MHz) . The MB88155 is also available in two versions : modulation-on/off selectable version (with ENS pin) and powerdown function built-in version (with XPD pin) . MB88155-M T F Input frequency range, With/without ENS/XPD Multiplied 0 : 12.5 MHz to 25.0 MHz, With ENS, Without XPD by 1 1 : 25.0 MHz to 50.0 MHz, With ENS, Without XPD 2 : 12.5 MHz to 25.0 MHz, Without ENS, With XPD 3 : 25.0 MHz to 50.0 MHz, Without ENS, With XPD Multiplied 0 : 12.5 MHz to 20.0 MHz, With ENS, Without XPD by 4 2 : 12.5 MHz to 20.0 MHz, Without ENS, With XPD → 0 : Down spread, 1 : Center spread → 1 : Multiplied by 1, 4 : Multiplied by 4 → Spread type Multiplication rate setting Line-up of MB88155 Product MB88155-100 MB88155-101 MB88155-102 MB88155-103 MB88155-110 MB88155-111 MB88155-112 MB88155-113 MB88155-400 MB88155-402 MB88155-410 MB88155-412 Input frequency 12.5 MHz to 25 MHz 25 MHz to 50 MHz 12.5 MHz to 25 MHz 25 MHz to 50 MHz 25 MHz to 50 MHz 12.5 MHz to 25 MHz 25 MHz to 50 MHz Multiplication rate Output frequency Modulation Modulation Power type enable pin down pin Yes Down spread No Yes Center spread No Down spread Center spread Yes No Yes No Yes No Yes No Yes Yes No No The same as Multiplied by 1 input frequency 12.5 MHz to 25 MHz 12.5 MHz to 20 MHz Multiplied by 4 50 MHz to 80 MHz 3 MB88155 ■ PIN ASSIGNMENT XIN 1 XOUT 2 ENS 3 SEL 4 8 VDD XIN 1 XOUT 2 XPD 3 SEL 4 8 VDD MB88155 -xx0 -xx1 7 CKOUT 6 VSS 5 REFOUT MB88155 -xx2 -xx3 7 CKOUT 6 VSS 5 REFOUT FPT-8P-M05 ■ PIN DESCRIPTION Pin name XIN XOUT ENS/XPD I/O I O I Pin no. 1 2 3 Description Connection pin of resonator/clock input pin Connection pin of resonator Modulation enable pin/power down pin Modulation rate setting pin Down spread, SEL = “L” : Modulation rate − 1.0% Down spread, SEL = “H” : Modulation rate − 2.0% Down spread, SEL = “L” : Modulation rate ± 0.5% Down spread, SEL = “H” : Modulation rate ± 1.0% Non-modulated clock output pin This pin becomes to“L” at power-down. GND Pin Modulated clock output pin This pin becomes to“L” at power-down. Power supply voltage pin SEL I 4 REFOUT VSS CKOUT VDD O ⎯ O ⎯ 5 6 7 8 4 MB88155 ■ I/O CIRCUIT TYPE Pin Circuit type Remarks • CMOS hysteresis input SEL XPD • CMOS hysteresis input with pull-up resistor of 50 kΩ (Typ) 50 kΩ ENS • CMOS output • IOL = 3 mA • “L” output at power-down REFOUT (Continued) 5 MB88155 (Continued) Pin Circuit type Remarks • CMOS output • IOL = 4 mA • “L” output at power-down CKOUT For XIN pin and XOUT pin, refer to “■ OSCILLATION CIRCUIT”. 6 MB88155 ■ HANDLING DEVICES Preventing Latchup A latchup can occur if, on this device, (a) a voltage higher than VDD or a voltage lower than VSS is applied to an input or output pin or (b) a voltage higher than the rating is applied between VDD and VSS. The latchup, if it occurs, significantly increases the power supply current and may cause thermal destruction of an element. When you use this device, be very careful not to exceed the maximum rating. Handling unused pins Do not leave an unused input pin open, since it may cause a malfunction. Handle by, using a pull-up or pulldown resistor. Unused output pin should be opened. The attention when the external clock is used Input .


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