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| PI6C48535-11 3.3V Low Skew 1-to-4 Crystal/LVCMOS to LVPECL Fanout Buffer Features * * * * * * * * * * * Maximum operation frequency: 500MHz 4 pair of differential LVPECL outputs Selectable CLK and crystal inputs CLK accepts LVCMOS, LVTTL input level Output Skew: 30ps (maximum) Part-to-part skew: 150ps (maximum) Propagation delay: 1.5ns (maximum) 3.3V power supply Pin-to-pin compatible to ICS8535-11 Operating Temperature: -40oC to 85oC Packaging (Pb-free & Green available): - 20-pin TSSOP (L) Description The PI6C48535-11 is a high-performance low-skew LVPECL fanout buffer. PI6C48535-11 features selectable of single-ended clock or crystal inputs and translates to four LVPECL outputs. The CLK input accepts LVCMOS or LVTTL signals. The outputs are synchronized with input clock during asynchronous assertion /deassertion of CLK_EN pin. PI6C48535-11 is ideal for crystal or LVCMOS/LVTTL to LVPECL translation. Typical clock translation and distribution applications are data-communications and telecommunications. Block Diagram CLK_EN D Q LE CLK Xtal1 Xtal2 0 1 Q0 nQ0 Q1 nQ1 Q2 nQ2 Q3 nQ3 Pin Diagram VEE CLK_EN CLK_SEL CLK NC Xtal1 Xtal2 NC NC VCC 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 Q0 NQ0 VCC Q1 NQ1 Q2 NQ2 VCC Q3 NQ3 CLK_SEL 1 PS9738 05/27/04 PI6C48535-11 3.3V Low Skew 1-to-4 Crystal/LVCMOS to LVPECL Fanout Buffer Pin Description Name VEE CLK_EN CLK_SEL CLK Xtal1, Xtal2 NC VCC Q3, nQ3 Q2, nQ2 Q1, nQ1 Q0, nQ0 Pin # 1 2 3 4 6, 7 5, 8, 9 10, 13, 18 11, 12 14, 15 16, 17 19, 20 P O O O O Type P I_PU I_PD I_PD Connect to Negative power supply Synchronizing clock enable. When high, clock outputs follow clock input. When low, Qx outputs are forced low, nQx outputs are forced high. LVCMOS/LVTTL level with 50K pull up. Clock select input. When high, selects CLK1 input. When low, selects CLK0 input. LVCMOS/LVTTL level with 50K pull down. LVCMOS / LVTTL clock input Crystal input and output No internal connection. Connect to 3.3V Differential output pair, LVPECL interface level. Differential output pair, LVPECL interface level. Differential output pair, LVPECL interface level. Differential output pair, LVPECL interface level. Description Notes: 1. I = Input, O = Output, P = Power supply connection, I_PD = Input with pull down, I_PU = Input with pull up Pin Characteristics Symbol CIN R_pullup R_pulldown Parameter Input Capacitance Input Pullup Resistance Input Pulldown Resistance 50 50 Conditions Min. Typ. Max. 4 Units pF K K Control Input Function Table Inputs CLK_EN 0 0 1 1 Notes: 1. After CLK_EN switches, the clock outputs are disabled or enabled following a rising and falling input clock edge as show below. Outputs Selected Source CLK Xtal1, Xtal2 CLK Xtal1, Xtal2 Q0:Q3 Diasbled: Low Disabled: Low Enabled Enabled nQ0:nQ3 CLK_SEL 0 1 0 1 Diasbled: High Disabled: High Enabled Enabled 2 PS9738 05/27/04 PI6C48535-11 3.3V Low Skew 1-to-4 Crystal/LVCMOS to LVPECL Fanout Buffer Figure 1. CLK_EN Timing Diagram Disabled Enabled CLK CLK_EN nQ0:nQ3 Q0:Q3 Clock Input Function Table Inputs CLK 0 1 Q0:Q3 LOW HIGH Outputs nQ0:nQ3 HIGH LOW Absolute Maximum Ratings Symbol VCC VIN VOUT TSTG Parameter Supply voltage Input voltage Output voltage Storage temperature Conditions Referenced to GND Referenced to GND Referenced to GND -0.5 -0.5 -65 Min. Typ. Max. 4.6 VCC +0.5V VCC +0.5V 150 V oC Units Notes: 1. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are stress specifications only and correct functional operation of the device at these or any other conditions above those listed in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect product reliability. Operating Conditions Symbol VCC TA IEE Parameter Power Supply Voltage Ambient Temperature Power Supply Current Conditions Min. 3.0 -40 Typ. 3.3 Max. 3.6 85 60 Units V oC mA 3 PS9738 05/27/04 PI6C48535-11 3.3V Low Skew 1-to-4 Crystal/LVCMOS to LVPECL Fanout Buffer LVCMOS/LVTTL DC Characteristics (TA = -40oC to 85oC, VCC = 3.0V to 3.6V unless otherwise stated below.) Symbol VIH VIL IIH IIL Parameter Input High Voltage Input Low Voltage Input High Current Input Low Current CLK, CLK_SEL CLK_EN CLK, CLK_SEL CLK_EN VIN = VCC = 3.6V VIN = VCC = 3.6V VIN = 0V, VCC = 3.6V VIN = 0V, VCC = 3.6V -5 -150 Conditions Min 2 -0.3 Typ Max VCC+0.3 0.8 150 5 A Units V LVPECL DC Characteristics (TA = -40oC to 85oC, VCC = 3.0V to 3.6V unless otherwise stated below.) Symbol VOH VOL VSWING Notes: 1. Outputs terminated with 50 to VCC-2.0V Parameter Output Output High Voltage(1) Low Voltage(1) Conditions Min. VCC-1.4 VCC-2.0 0.6 Typ. Max. VCC-0.9 VCC-1.7 1.0 Units V Peak-to-peak Output Voltage Swing Crystal Characteristics Parameter Mode of Oscillation Frequency Range Equivalent Series Resistance (ESR) Shunt Capacitance 14 Min. Typ. Fundamental 25 70 7 MHz pF Max. Units AC Characteristics (TA = -40oC to 85oC, VCC = 3.0V to 3.6V) Symbol fmax tPd Tsk(o) Tsk(pp) tr/tf odc Osc Parameter Output Frequency Propagation Part-to-part Delay(1) Skew(2) 20% - 80% 100 48 Skew(3) 1.0 Output-to-output Conditions Min. Typ. Max. 500 1.5 30 150 400 52 1000 % ppm ps Units MHz ns Output Rise/Fall time Output duty cycle Crystal Tolerance Notes: 1. Measured from the VCC/2 of the input to the differential output crossing point 2. Defined as skew between outputs at the same supply voltage and with equal load condition. Measured at the outputs differential crossing point. 3. Defined as skew between outputs on different parts operating at the same supply voltage and with equal load condition. Measured at the outputs differential crossing point. 4. All parameters are measured at 500MHz unless noted otherwise 4 PS9738 05/27/04 PI6C48535-11 3.3V Low Skew 1-to-4 Crystal/LVCMOS to LVPECL Fanout Buffer Packaging Mechanical: 20-Pin TSSOP (L) 20 .169 .177 4.3 4.5 1 .252 .260 6.4 6.6 .004 0.09 .008 0.20 .047 1.20 Max SEATING PLANE 0.45 0.75 .018 .030 .238 .269 6.1 6.7 .0256 BSC 0.65 .007 .012 0.19 0.30 .002 0.05 .006 0.15 X.XX X.XX DENOTES CONTROLLING DIMENSIONS IN MILLIMETERS Ordering Information Ordering Code PI6C48535-11LE Package Code L Package Description Pb-free & Green 20-pin 173-mil wide TSSOP Notes: 1. Thermal characteristics can be found on the company web site at www.pericom.com/packaging/ 2. Number of Transistors = TBD Pericom Semiconductor Corporation * 1-800-435-2336 * www.pericom.com 5 PS9738 05/27/04 |
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