PI6C48535-01 3.3V Low Skew 1-to-4 LVTTL/LVCMOS to LVPECL Fanout Buffer Features Description • • • • • • • • • • • The PI6C48535-01 is a high-performance low-skew LVPECL fanout buffer. PI6C48535-01 features two selectable single-ended clock inputs and translates to four LVPECL outputs. The CLK0 and CLK1 inputs accept LVCMOS or LVTTL signals. The outputs are synchronized with input clock during asynchronous assertion/ deassertion of CLK_EN pin. PI6C48535-01 is ideal for singleended LVTTL/LVCMOS to LVPECL translations. Typical clock translation and distribution applications are data-communications and telecommunications. Maximum operation frequency: 500 MHz 4 pair of differential LVPECL outputs Selectable CLK0 and CLK1 inputs CLK0, CLK1 accept LVCMOS, LVTTL input level Output Skew: 80ps (maximum) Part-to-part skew: 150ps (maximum) Propagation delay: 1.9ns (maximum) 3.3V power supply Pin-to-pin compatible to ICS8535-01 Operating Temperature: -40oC to 85oC Packaging (Pb-free & Green available): — 20-pin TSSOP (L) Block Diagram Pin Configuration D CLK_EN Q LE CLK 0 CLK1 1 Q0 nQ0 Q1 nQ1 CLK_SEL Q2 nQ2 VEE 1 20 Q0 CLK_EN 2 19 NQ0 CLK_SEL 3 18 VCC CLK0 4 17 Q1 NC 5 16 NQ1 CLK1 6 15 Q2 NC 7 14 NQ2 NC 8 13 VCC NC 9 12 Q3 VCC 10 11 NQ3 Q3 nQ3 1 PS8735A 11/15/05 PI6C48535-01 3.3V Low Skew 1-to-4 LVTTL/LVCMOS to LVPECL Fanout Buffer Pin Description Name Pin # Type Description VEE 1 P CLK_EN 2 I_PU 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 50KΩ pull up. CLK_SEL 3 I_PD Clock select input. When high, selects CLK1 input. When low, selects CLK0 input. LVCMOS/LVTTL level with 50KΩ pull down. CLK0 4 I_PD LVCMOS / LVTTL clock input CLK1 6 I_PD LVCMOS / LVTTL clock input Connect to Negative power supply NC 5, 7, 8, 9 VCC 10, 13, 18 No internal connection. P Connect to 3.3V. Q3, nQ3 11, 12 O Differential output pair, LVPECL interface level. Q2, nQ2 14, 15 O Differential output pair, LVPECL interface level. Q1, nQ1 16, 17 O Differential output pair, LVPECL interface level. Q0, nQ0 19, 20 O Differential output pair, LVPECL interface level. 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 Parameter Conditions Min. Typ. CIN Input Capacitance R_pullup Input Pullup Resistance 50 R_pulldown Input Pulldown Resistance 50 Max. Units 4 pF KΩ Control Input Function Table Inputs Outputs CLK_EN CLK_SEL Selected Source Q0:Q3 nQ0:nQ3 0 0 CLK0 Diasbled: Low Diasbled: High 0 1 CLK1 Disabled: Low Disabled: High 1 0 CLK0 Enabled Enabled 1 1 CLK1 Enabled Enabled Notes: 1. After CLK_EN switches, the clock outputs are disabled or enabled following a rising and falling input clock edge as show below. 2 PS8735A 11/15/05 PI6C48535-01 3.3V Low Skew 1-to-4 LVTTL/LVCMOS to LVPECL Fanout Buffer Figure 1. CLK_EN Timing Diagram Disabled Enabled CLK0 CLK1 CLK_EN nQ0:nQ3 Q0:Q3 Clock Input Function Table Inputs Outputs CLK0 or CLK1 Q0:Q3 nQ0:nQ3 0 LOW HIGH 1 HIGH LOW Absolute Maximum Ratings Symbol Parameter Conditions Min. Typ. Max. VCC Supply voltage Referenced to GND VIN Input voltage Referenced to GND -0.5 VCC+0.5V VOUT Output voltage Referenced to GND -0.5 VCC+0.5V TSTG Storage temperature -65 150 Units 4.6 V oC Notes: 1. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are stress speci fications 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 Parameter VCC Power Supply Voltage TA Ambient Temperature IEE Power Supply Current Conditions Min. Typ. Max. 3.0 3.3 3.6 V 85 oC 60 mA -40 500 MHz 3 PS8735A Units 11/15/05 PI6C48535-01 3.3V Low Skew 1-to-4 LVTTL/LVCMOS to LVPECL Fanout Buffer LVCMOS/LVTTL DC Characteristics (TA = -40oC to 85oC, VCC = 3.0V to 3.6V unless otherwise stated below.) Symbol Parameter Conditions Min. Typ. Max. Units VIH Input High Voltage CLK0, CLK1, CLK_EN, CLK_SEL 2 VCC+0.3 V VIL Input Low Voltage CLK0, CLK1 -0.3 1.3 V CLK_EN, CLK_SEL -0.3 0.8 V IIH Input High Current CLK0, CLK1, CLK_SEL VIN = VCC = 3.6V 150 uA CLK_EN VIN = VCC = 3.6V 5 uA IIL Input Low Current CLK0, CLK1, CLK_SEL VIN = 0V, VCC = 3.6V -5 uA CLK_EN VIN = 0V, VCC = 3.6V -150 uA LVPECL DC Characteristics (TA = -40oC to 85oC, VCC = 3.0V to 3.6V unless otherwise stated below.) Symbol Parameter VOH Output High Voltage(1) VCC-1.4 VCC-0.9 VOL Output Low Voltage(1) VCC-2.0 VCC-1.7 VSWING Peak-to-peak Output Voltage Swing 0.6 1.0 Notes: 1. Conditions Min. Typ. Max. Units V Outputs terminated with 50Ω to VCC-2.0V AC Characteristics (TA = -40oC to 85oC, VCC = 3.0V to 3.6V) Symbol Parameter fmax Output Frequency Conditions Delay(1) tPd Propagation Tsk(o) Output-to-output Tsk(pp) Part-to-part Min. 1.0 Skew(2) Output Rise/Fall time odc Output Duty Cycle Max. Units 500 MHz 1.9 ns 80 Skew(3) tr/tf Typ. 150 20% - 80% 80 400 40 60 ps % 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 500 MHz unless noted otherwise 4 PS8735A 11/15/05 PI6C48535-01 3.3V Low Skew 1-to-4 LVTTL/LVCMOS to LVPECL Fanout Buffer Packaging Mechanical: 20-Pin TSSOP (L) �� ���� ���� � ���� ������ ��� ��� ���� ���� ���� ����� ���� ���� ��� ���� ���� ���� ���� ����� ��� ���� ��� ��� ���� ���� ������� ����� ���� ���� ���� ���� ��� ��� ���� ���� ���� ���� Ordering Information Ordering Code Package Code Package Description PI6C48535-01L L 20-pin 173-mil wide TSSOP PI6C48535-01LE L Pb-free & Green 20-pin 173-mil wide TSSOP Notes: • Thermal characteristics can be found on the company web site at www.pericom.com/packaging/ • E = Pb-free & Green • X suffix = Tape/Reel Pericom Semiconductor Corporation • 1-800-435-2336 • www.pericom.com 5 PS8735A 11/15/05