CGS74CT2524 1 to 4 Minimum Skew (300 ps) Clock Driver General Description Features These minimum skew clock drivers are designed for Clock Generation and Support (CGS) applications operating at high frequencies. This device guarantees minimum output skew across the outputs of a given device. Skew parameters are also provided as a means to measure duty cycle requirements as those found in high speed clocking systems. The CGS74CT2524 is a minimum skew clock driver with one input driving four outputs, specifically designed for signal generation and clock distribution applications. Y Logic Symbol Connection Diagrams Y Y Y Y Y Y Y Guaranteed 300 ps pin-to-pin skew (tOSHL and tOSLH) Implemented on National’s FACTTM family process 1 input to 4 outputs low skew clock distribution Symmetric output current drive: 24 mA IOH/IOL Industrial temperature of b40§ C to a 85§ C 8-pin SOIC package Low dynamic power consumption above 20 MHz Guaranteed 2 kV ESD protection Pin Assignment SOIC (M) TL/F/11752– 1 TL/F/11752 – 2 The output pins act as a single entity and will follow the state of the CLK when the clock distribution chip is selected. Pin Description Pin Names Descripton CLK O0 – O3 Clock Input Outputs Truth Table Inputs Outputs CLK O0 – O3 L H L H TL/F/11752 – 3 L e Low Logic Level H e High Logic Level FACTTM is a trademark of National Semiconductor Corporation. C1995 National Semiconductor Corporation TL/F/11752 RRD-B30M115/Printed in U. S. A. CGS74CT2524 1 to 4 Minimum Skew (300 ps) Clock Driver September 1995 Absolute Maximum Ratings (Note) Recommended Operating Conditions If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Supply Voltage (VCC) 4.5V to 5.5V 0V to VCC Input Voltage (VI) Output Voltage (VO) 0 to VCC b 40§ C to a 85§ C Operating Temperature (TA) Input Rise and Fall Times (0.8V to 2.0V) 9.6 ns max NOTE: The Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the DC and AC Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The Recommended Operating Conditions will define the conditions for actual device operation. b 0.5 to 7.0V Supply Voltage (VCC) DC Input Voltage Diode Current (IIK) b 20 mA V e b0.5V a 20 mA V e VCC a 0.5V b 0.5V to (VCC a 0.5V) DC Input Voltage (VI) DC Output Diode (Current) (IO) b 20 mA V e b0.5V a 20 mA V e VCC a 0.5V b 0.5V to (VCC a 0.5V) DC Output Voltage (VO) DC Output Source g 50 mA or Sink Current (IO) DC VCC or Ground Current g 50 mA per Output Pin (ICC or IGND) b 65§ C to a 150§ C Storage Temperature (TSTG) Junction Temperature (iJA) 0 225 500 LFM M 167 132 117§ C/W N 115 79 62 § C/W DC Electrical Characteristics Over recommended operating conditions unless specified otherwise. CGS74CT2524 Symbol Parameter VCC (V) TA e a 25§ C TA e b40§ C to a 85§ C Typ Units Conditions Guaranteed Limits VIH Minimum High Level Input Voltage 4.5 5.5 1.5 1.5 2.0 2.0 2.0 2.0 V VOUT e 0.1V or VCC e b0.1V VIL Maximum Low Level Input Voltage 4.5 5.5 1.5 1.5 0.8 0.8 0.8 0.8 V VOUT e 0.1V or VCC e b0.1V VOH Minimum High Level Output Voltage 4.5 5.5 4.49 5.49 4.4 5.4 4.4 5.4 V VIN e VIH IOUT e b50 mA 3.86 4.86 3.76 4.76 V VIN e VIH IOH e b24 mA 0.1 0.1 0.1 0.1 V VIN e VIL IOUT e 50 mA 4.5 5.5 0.36 0.36 0.44 0.44 V VIN e VIL IOL e 24 mA g 0.1 g 1.0 mA VI e VCC, GND VI e VCC b 2.1V 4.5 5.5 VOL Minimum Low Level Output Voltage 4.5 5.5 0.001 0.001 IIN Maximum Input Leakage Current 5.5 ICCT Maximum ICC/Input 5.5 1.5 mA IOLD Minimum Dynamic Output Current 5.5 75 mA VOLD e 1.65V Max 5.5 b 75 mA VOHD e 3.85V Min 80 mA VIN e VCC or GND IOHD ICC Maximum Quiescent Supply Current 5.5 0.6 8.0 2 AC Electrical Characteristics Over recommended operating conditions unless specified otherwise. All typical values are measured at VCC e 5V, TA e 25§ C. CGS74CT2524 Symbol VCC e 4.5V to 5.5V TA e b40§ C to a 85§ C CL e 50 pF RL e 500X Parameter Min Typ Units Max tPLH Low-to-High Propagation Delay CLK to On 3.5 9.0 ns tPHL High-to-Low Propagation Delay CLK to On 3.5 9.0 ns Extended AC Electrical Characteristics Over recommended operating conditions unless specified otherwise. All typical values are measured at VCC e 5V, TA e 25§ C. CGS74CT2524 Symbol VCC e 4.5V to 5.5V TA e b40§ C to a 85§ C CL e 50 pF RL e 500X Parameter Package Min Typ Units Max Fmax Maximum Operating Frequency tOSHL Maximum Skew Common Edge Output-to-Output Variation (Note 1) M M (Note 2) N 300 450 500 ps Maximum Skew Common Edge Output-to-Output Variation (Note 1) M M (Note 2) N 300 450 500 ps tOSLH 100 MHz tPS Maximum Skew Pin (Signal) Transition Variation (Note 3) 1.0 ns trise tfall Rise Time/Fall Time (from 0.8V to 2.0V/2.0V to 0.8V) 1.5 ns THigh Time High 4 ns TLow Time Low 4 ns Note 1: Output-to-Output Skew is defined as the absolute value of the difference between the actual propagation delay from any outputs within the same packaged device. The specifications apply to any outputs switching in the same direction either HIGH to LOW (tOSHL) or LOW to HIGH (tOSLH) or in opposite directions both HL and LH (tOST). tOSHL and tOSLH are characterized and guaranteed by design @ 1 MHz. Note 2: Characterized at 66 MHz. Parameter guaranteed by design. Note 3: Pin transition skew is the absolute difference between High-to-Low and Low-to-High propagation delay measure at a given output pin. Note 4: Load capacitance includes the test jig. 3 Timing Diagrams 1 to 4 Min-Skew Clock Driver TL/F/11752 – 4 TL/F/11752 – 5 TL/F/11752 – 13 Time high is measured with outputs above 2V. Time low is measured with outputs below 0.8V. Test Circuit RL is 500X CL is 50 pF for all prop delays and skew measurements. TL/F/11752 – 6 4 Ordering Information Contact NSC Marketing for specific data of availability TL/F/11752 – 14 5 CGS74CT2524 1 to 4 Minimum Skew (300 ps) Clock Driver Physical Dimensions inches (millimeters) 8 Lead (0.150× Wide) Molded Small Outline Package (M) NS Package Number M08A LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. 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