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PI6C918 Datasheet(PDF) 1 Page - Pericom Semiconductor Corporation |
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PI6C918 Datasheet(HTML) 1 Page - Pericom Semiconductor Corporation |
1 / 3 page 1 PS7038B 09/08/97 Pin Name Pin # I/O Description S0 6 I Select 0, internal pull-up S1 7 I Select 1, internal pull-up X1 2 C Crystal or clock input, 8 to 23 MHz X2 3 C Crystal connection or no connect CLK 5 O Clock output OE 1 I OE = 1 Enable CLK output OE = 0 Disable CLK output 3.3V Precision Clock Generator 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 PI6C918/919 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 Pin Configuration Pin Description Product Speed Grades Max CLK Max VCO Part No. Output Freq. Frequency PI6C918/919 80 MHz 160 MHz PI6C918A/919A 100 MHz 200 MHz PI6C918B/919B 120 MHz 240 MHz Output CLK Frequency Selection Vcc 1 OE 8 S1 2 X1 7 S0 3 X2 6 CLK 4 GND 5 8-PIN W8 Note: 1. I = Input, O = Output, C = Crystal 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. Notes: 1. Indicates popular target frequencies. 2. The ratio of N/M may be changed by mask option. n o i t c e l e S 0 S , 1 SM / N ) 2 ( k c o l C 0 1 g n i s u ( ) l a t X z H M k c o l C 6 . 6 1 g n i s u ( ) l a t X z H M k c o l C 0 2 g n i s u ( ) l a t X z H M k c o l C 1 . 2 2 g n i s u ( ) l a t X z H M 0 02 – 3 . 3 3 ) 1 ( 0 42 . 4 4 1 04 0 4 ) 1 ( 6 . 6 6 ) 1 ( 0 8 ) 1 ( 4 . 8 8 0 15 0 5 ) 1 ( 3 80 0 1 ) 1 ( 5 . 0 1 1 1 170 7 ) 1 ( 6 1 1 –– |
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