851010 1-to-10, Differential HCSL Fanout Buffer Datasheet General Description Features The 851010 is a 1-to-10 Differential HCSL Fanout Buffer. The Ten differential HCSL outputs 851010 is designed to translate any differential signal levels to Translates any differential input signal (LVPECL, LVHSTL, LVDS, differential HCSL output levels. An external reference resistor is HCSL) to HCSL levels without external bias networks used to set the value of the current supplied to an external load. The Maximum output frequency: 250MHz load resistor value is chosen to equal the value of the characteristic Output skew: 165ps (maximum) line impedance of 50 . The 851010 is characterized at an operating Part-to-part skew: 250ps (maximum) supply voltage of 3.3V. Output drift: 140ps (maximum) The differential HCSL outputs, accurate crossover voltage and symmetric duty cycle makes the 851010 ideal for interfacing to PCI V : 850mV (maximum) OH Express and FBDIMM applications. Full 3.3V supply voltage Available in lead-free (RoHS 6) package 0C to 70C ambient operating temperature Block Diagram Pin Assignment CLK nCLK 32 31 30 29 28 27 26 25 Q0 Q9 Q0 1 nQ0 nQ9 24 nQ7 Q8 Q1 2 nQ0 23 Q7 nQ8 nQ1 VDD 3 VDD 22 Q2 Q7 4 nQ6 Q1 21 nQ2 nQ7 nQ1 Q6 5 20 Q3 Q6 nQ3 nQ6 Q2 6 nQ5 19 Q4 Q5 nQ2 7 Q5 18 nQ4 nQ5 VDD 8 VDD 17 9 10 11 12 13 14 15 16 IREF 851010 32-Lead LQFP 7mm x 7mm x 1.4mm package body Y Package Top View 2015 Integrated Device Technology, Inc 1 December 3, 2015 GND nQ9 IREF Q9 Q3 VDD nQ3 nQ8 VDD Q8 VDD nCLK Q4 CLK nQ4 GND851010 Datasheet Table 1. Pin Descriptions Number Name Type Description 1, 2 Q0, nQ0 Output Differential output pair. Differential HCSL interface levels. 3, 8, 13, 14, V Power Positive supply pins. DD 17, 22, 30 4, 5 Q1, nQ1 Output Differential output pair. Differential HCSL interface levels. 6, 7 Q2, nQ2 Output Differential output pair. Differential HCSL interface levels. 9, 25 GND Power Power supply ground. 10 IREF Input Reference current input. Used to set the output current. Connect to 950 resistor to ground. 11, 12 Q3, nQ3 Output Differential output pair. Differential HCSL interface levels. 15, 16 Q4, nQ4 Output Differential output pair. Differential HCSL interface levels. 18, 19 Q5, nQ5 Output Differential output pair. Differential HCSL interface levels. 20, 21 Q6, nQ6 Output Differential output pair. Differential HCSL interface levels. 23, 24 Q7, nQ7 Output Differential output pair. Differential HCSL interface levels. 26 CLK Input Non-inverting differential input. 27 nCLK Input Inverting differential clock input. 28, 29 Q8, nQ8 Output Differential output pair. Differential HCSL interface levels. 31, 32 Q9, nQ9 Output Differential output pair. Differential HCSL interface levels. Output Driver Current The 851010 outputs are HCSL differential current drive with the current being set with a resistor from I to ground. For REF a single load and a 50 pc board trace, the drive current would typically be set with a R of 950 which products an I of 1.16mA. REF REF The I is multiplied by a current mirror to an output drive of IREF REF 12*1.16mA or 13.90mA. See Figure 1 for current mirror and output drive details. RREF RL RL 950 Figure 1. HCSL Current Mirror and Output Drive 2015 Integrated Device Technology, Inc 2 December 3, 2015