CGS74LCT2524 1 to 4 Minimum Skew (300 ps) 3V Clock Driver General Description Features This minimum skew clock driver is a 3V option of the current CGS74CT2524 Minimum Skew Clock Driver and is designed for Clock Generation and Support (CGS) applications operating at low voltage, high frequencies. This device guarantees minimum output skew across the outputs of a given device. n Ideal for low power/low noise high speed applications n Guaranteed: — 300 ps pin-to-pin skew (tOSHL and tOSLH) n Implemented on National’s FACT™ family process n 1 input to 4 outputs low skew clock distribution n Symmetric output current drive: 12 mA IOH/IOL n Industrial temperature of −40˚C to +85˚C n 8-pin SOIC package n Low dynamic power consumption above 20 MHz n Guaranteed 2 kV ESD protection Skew parameters are also provided as a means to measure duty cycle requirements as those found in high speed clocking systems. This minimum skew clock driver with one input driving four outputs, is specifically designed for signal generation and clock distribution applications. Logic Symbol Connection Diagrams Pin Assignment SOIC (MO) 01195601 The output pins act as a single entity and will follow the state of the CLK when the clock distribution chip is selected. 01195602 Pin Description Pin Names Description CLK Clock Input O0–O3 Outputs Truth Table Inputs Outputs CLK O0–O3 01195603 L L H H See NS Package Number M08A L = Low Logic Level H = High Logic Level FACT™ is a trademark of National Semiconductor Corporation. © 2003 National Semiconductor Corporation DS011956 www.national.com CGS74LCT2524 1 to 4 Minimum Skew (300 ps) 3V Clock Driver November 2003 CGS74LCT2524 Absolute Maximum Ratings Junction Temperature (θJA) (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (VCC) Airflow −0.5V to 7.0V Recommended Operating Conditions −20 mA V = VCC + 0.5V +20 mA DC Input Voltage (VI) Supply Voltage (VCC) −0.5V to VCC +0.5V DC Output Diode Current (IO) 3.0V to 3.6V Input Voltage (VIN) 0V to VCC Output Voltage (VO) 0V to VCC Operating Temperature (TA) V = −0.5V −20 mA Industrial V = VCC + 0.5V +20 mA Commercial DC Output Voltage (VO) −0.5V to VCC +0.5V DC Output Source or Sink Current (IO) 0˚C to +70˚C 9.6 ns max (0.8V to 2.0V) Note 1: 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. ± 50 mA ± 50 mA per Output Pin (ICC or IGND) −40˚C to +85˚C Input Rise and Fall Times DC VCC or Ground Current Storage Temperature (TSTG) 500 LFM M 167 132 117 ˚C/W DC Input Voltage Diode Current (IIK) V = −0.5V 0 225 −65˚C to +150˚C DC Electrical Characteristics Over recommended operating conditions unless specified otherwise. Symbol VIH Parameter Minimum High Level VCC (V) Conditions CGS74LCT2524 TA = +25˚C Typ TA = −40˚C to +85˚C Units Guaranteed Limits VOUT = 0.1V or VCC−0.1V 3.6 1.5 2.0 2.0 V VOUT = 0.1V or VCC−0.1V 3.6 1.5 0.8 0.8 V VIN = VIL or VIH, IOUT = −50 µA 3.0 2.9 2.9 V Output Voltage VIN = VIL or VIH, IOH = −12 mA 3.0 2.5 2.4 V Minimum Low Level VIN = VIL or VIH, IOUT = 50 µA 3.0 0.1 0.1 V Output Voltage VIN = VIL or VIH, IOL = −12 mA 3.0 0.3 0.4 V Maximum Input VIN = VCC, GND 3.6 ± 0.1 ± 1.0 µA 3.6 100 µA Input Voltage VIL Maximum Low Level Input Voltage VOH VOL IIN Minimum High Level Leakage Current ICCT Maximum ICC/Input VIN = 3.0V IOLD Minimum Dynamic VOLD = 0.8V (max) 3.6 36 mA IOHD Output Current VOHD = 2.0V (min) 3.6 −25 mA Maximum Quiescent VIN = VCC or GND 3.6 10 µA ICC Supply Current www.national.com 2 2.5 Over recommended operating conditions unless specified otherwise. All typical values are measured at VCC = 3.3V, TA = 25˚C LCT2524 VCC = 3.0V to 3.6V Symbol TA = −40˚C to +85˚C Parameter Units CL = 50 pF RL = 500Ω Min tPLH Low-to-High Propagation Delay Typ Max 6 15.0 ns 6 15.0 ns CLK to On tPHL High-to-Low Propagation Delay CLK to On Extended AC Electrical Characteristics Over recommended operating conditions unless specified otherwise. All typical values are measured at VCC = 3.3V, TA = 25˚C LCT2524 VCC = 3.0V to 3.6V Symbol TA = −40˚C to +85˚C Parameter Units CL = 50 pF RL = 500Ω Min fmax Maximum Operating Frequency tOSHL Maximum Skew Common Edge Typ Max 75 MHz 300 ps 300 ps 2.5 ns 2.5 ns Output-to-Output Variation (Note 2) tOSLH Maximum Skew Common Edge Output-to-Output Variation (Note 2) tPS Maximum Skew Pin (Signal) Transition Variation (Note 3) tRISE Rise Time/Fall Time tFALL (from 0.8V to 2.0V/2.0V to 0.8V) THIGH Time High 4 ns TLOW Time Low 4 ns Note 2: Output-to-Output Skew is defined as the absolute value of the difference between the actual propagation delay for 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). Limits are characterized and guaranteed by design @ 66 MHz. Note 3: Pin transition skew is the absolute difference between HIGH-to-LOW and LOW-to-HIGH propagation delay, measured at a given output pin. Note 4: Refer to Minimum Skew Parameters Measurement Information Chart for definitions of each skew specification. Note 5: Load capacitance includes the test jig. Timing Diagrams 01195605 3 www.national.com CGS74LCT2524 AC Electrical Characteristics CGS74LCT2524 Timing Diagrams (Continued) 01195606 01195604 Test Circuit 01195607 RL is 500Ω CL is 50 pF for all propagation delays and skew measurements. Ordering Information (Contact NSC Mar- keting for specific date of availability) 01195608 www.national.com 4 CGS74LCT2524 1 to 4 Minimum Skew (300 ps) 3V Clock Driver Physical Dimensions inches (millimeters) unless otherwise noted 8-Lead (0.150" Wide) Molded Small Outline Package, JEDEC Order Number CGS74LCT2524M 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 AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. 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