FemtoClock Crystal-to-3.3V, 2.5V 843021I-01 LVPECL Clock Generator DATA SHEET General Description Features The 843021I-01 is a Gigabit Ethernet Clock Generator. The One differential 3.3V or 2.5V LVPECL output 843021I-01 uses a 25MHz crystal to synthesize 125MHz. The Crystal oscillator interface designed for 25MHz, 843021I-01 has excellent phase jitter performance, over the 18pF parallel resonant crystal 1.875MHz 20MHz integration range. The 843021I-01 is packaged Output frequency range: 125MHz, using a 25MHz crystal in a small 8-pin TSSOP, making it ideal for use in systems with VCO range: 490MHz 640MHz limited board space. RMS phase jitter 125MHz, using a 25MHz crystal (1.875MHz 20MHz): 0.41ps (typical) Full 3.3V or 2.5V operating supply -40C to 85C ambient operating temperature Available in lead-free (RoHS 6) package Block Diagram Pin Assignment Pullup OE VCC 1 8 Q 25MHz XTAL OUT 2 7 nQ XTAL IN XTAL IN VCC 3 6 Q Phase 4 OSC VCO VEE OE 4 5 nQ Detector (fixed) XTAL OUT 843021I-01 20 8 Lead TSSOP (fixed) 4.40mm x 3.0mm x 0.925mm package body G Package Top View 843021I-01 Rev A 9/25/15 2015 Integrated Device Technology, Inc. 843021I-01 Data Sheet FEMTOCLOCK CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR Table 1. Pin Descriptions Number Name Type Description 1, 6 V Power Power supply pins. CC 2, XTAL OUT Input Crystal oscillator interface. XTAL IN is the input, XTAL OUT is the output. 3 XTAL IN Power Negative supply pin. 4V EE Active high output enable. When logic HIGH, the outputs are enabled and active. 5 OE Input Pullup When logic LOW, the outputs are disabled and are in a high impedance state. LVCMOS/LVTTL interface levels. 7, 8 nQ, Q Output Differential output pair. LVPECL interface levels. NOTE: Pullup refers to internal input resistors. See Table 2, Pin Characteristics, for typical values. Table 2. Pin Characteristics Symbol Parameter Test Conditions Minimum Typical Maximum Units C Input Capacitance 4pF IN R Input Pullup Resistor 51 k PULLUP Absolute Maximum Ratings NOTE: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are stress specifications only. Functional operation of product at these conditions or any conditions beyond those listed in the DC Characteristics or AC Characteristics is not implied. Exposure to absolute maximum rating conditions for extended periods may affect product reliability. Item Rating Supply Voltage, V 4.6V CC Inputs, V -0.5V to V + 0.5V I CC Outputs, I O Continuos Current 50mA Surge Current 100mA 129.5C/W (0 mps) Package Thermal Impedance, JA -65C to 150C Storage Temperature, T STG DC Electrical Characteristics Table 3A. Power Supply DC Characteristics, V = 3.3V 5%, V = 0V, T = -40C to 85C CC EE A Symbol Parameter Test Conditions Minimum Typical Maximum Units Positive Supply Voltage 3.135 3.3 3.465 V V CC I Power Supply Current 64 mA EE Table 3B. Power Supply DC Characteristics, V = 2.5V 5%, V = 0V, T = -40C to 85C CC EE A Symbol Parameter Test Conditions Minimum Typical Maximum Units V Positive Supply Voltage 2.375 2.5 2.625 V CC I Power Supply Current 62 mA EE 843021I-01 Rev A 9/25/15 2 2015 Integrated Device Technology, Inc.