CGS74B2525

CGS74B2525 1-to-8 Minimum Skew Clock Driver September 1995 CGS74B2525 1-to-8 Minimum Skew Clock Driver General Description This minimum skew clock driver is designed for Clock Generation and Support (CGS) applications operating well above 20 MHz (33 MHz 50 MHz) The device guarantees minimum output skew across the outputs of a given device and also from device-to-device Skew parameters are also provided as a means to measure duty cycle requirements as those found in high speed clocking systems The ’B2525 is a minimum skew clock driver with one input driving eight outputs specifically designed for signal generation and clock distribution applications Features Y Y Y Y Y Y Y Y Y Y Clock Generation and Support (CGS) Device Ideal for high frequency signal generation or clock distribution applications CGS74B version features National’s Advanced Bipolar FAST LSI process 1-to-8 low skew clock distribution 600 ps pin-to-pin output skew Specifications for device-to-device variation of propagation delay Specification for transition skew to meet duty cycle requirements Center pin VCC and GND configuration to minimize high speed switching noise Current sourcing 48 mA and current sinking of 64 mA Low dynamic power consumption above 20 MHz Guaranteed 4 kV ESD protection Logic Symbol Connection Diagram Pin Assignment for DIP and SOIC TL F 10907 – 1 TL F 10907 – 2 FAST and TRI-STATE are registered trademarks of National Semiconductor Corporation C1995 National Semiconductor Corporation TL F 10907 RRD-B30M115 Printed in U S A Functional Description Pin Description Pin Names CLK O0 – O7 Description Clock Input Outputs Truth Table Inputs CLK L H Outputs O0 –O7 L H TL F 10907 – 5 2 Absolute Maximum Ratings (Note 1) If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage (VCC) Input Voltage (VI) Operating Free Air Temperature Storage Temperature Range Junction Temperature (iJA) Plastic (N) Package JEDEC SOIC (M) Package 7 0V 7 0V 0 C to a 70 C b 65 C to a 150 C 104 120 CW CW Recommended Operating Conditions Supply Voltage (VCC) Input Rise and Fall Times (0 8V to 2 0V) Free Air Operating Temperature (TA) 4 5V to 5 5V 9 6 ns max 0 C to a 70 C 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 DC Electrical Characteristics over recommended operating conditions unless specified otherwise All typical values are measured at VCC e 5V TA e 25 C Symbol VIK VIH VIL VOH Parameter Input Clamp Voltage Minimum Input High Level Voltage Maximum Input Low Level Voltage High Level Output Voltage Low Level Output Voltage Input Current Max Input Voltage High Level Input Current Low Level Input Current Output Drive Current Supply Current IOH e b3 mA VCC e 4 5V IOH e b48 mA VCC e 4 5V VCC e 4 5V IOL e 64 mA VCC e 5 5V VIH e 7V VCC e 5 5V VIH e 2 7V VCC e 5 5V VIH e 0 4V VCC e 5 5V VO e 2 25V VCC e 5 5V Outputs High Outputs Low CIN Input Capacitance VCC e 5V b 50 Conditions VCC e 4 5V II e b18 mA Min Typ Max b1 2 Units V V 20 08 24 20 0 35 05 01 20 b0 5 b 150 V V V mA mA mA mA mA mA pF VOL II IIH IIL IO ICC 8 32 5 15 42 3 AC Electrical Characteristics Over recommended operating conditions unless specified otherwise CGS74B2525 Symbol Parameter Min tPLH tPHL Propagation Delay CLK to On 2 2 VCC e 4 5V to 5 5V RL e 500X CL e 50 pF Typ 30 30 Max 48 48 ns Units Extended AC Electrical Characteristics Over recommended operating conditions unless specified otherwise CGS74B2525 Symbol Parameter Min fmax tOSHL Maximum Operating Frequency Maximum Skew Common Edge Output-to-Output Variation (Note 2) Maximum Skew Common Edge Output-to-Output Variation (Note 2) Maximum Skew Opposite Edge Output-to-Output Variation (Note 2) Maximum Skew Part-to-Part Variation Skew (Note 3) Maximum Skew Pin (Signal) Transition Variation (Note 2) Maximum Rise Fall Time (from 0 8V to 2 0V 2 0V to 0 8V) 06 50 150 600 VCC e 4 5V to 5 5V RL e 500X CL e 50 pF TA e 0 C to 70 C Typ Max MHz ps Units tOSLH 150 600 ps tOST 07 15 ns tPV 1 75 ns tPS 15 16 14 ns ns ns trise tfall 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) Parameters tOST and tPS guaranteed by design tOSHL and tOSLH are characterized and guaranteed by design 1 MHz Note 3 Part-to-part skew is defined as the absolute value of the difference between the propagation delay for any outputs from device to device The parameter is specified for a given set of conditions (i e capacitive load VCC temperature of outputs switching etc ) Parameter guaranteed by design Note 4 Load capacitance includes the test jig 4 Timing Diagrams TL F 10907 – 16 TL F 10907 – 17 Test Circuit RL is 500X CL is 50 pF for all prop delays and skew measurements TL F 10907 – 18 5 Ordering Information The device number is used to form part of a simplified purchasing code where the package type and temperature range are defined as follows TL F 10907 – 19 6 Physical Dimensions inches (millimeters) 14-Lead Small Outline Integrated Circuit NS Package Number M14A 7 CGS74B2525 1-to-8 Minimum Skew Clock Driver Physical Dimensions inches (millimeters) (Continued) 14-Lead Plastic Dual-In-Line Package NS Package Number N14A 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 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 National Semiconductor Corporation 1111 West Bardin Road Arlington TX 76017 Tel 1(800) 272-9959 Fax 1(800) 737-7018 2 A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness National Semiconductor Europe Fax (a49) 0-180-530 85 86 Email cnjwge tevm2 nsc com Deutsch Tel (a49) 0-180-530 85 85 English Tel (a49) 0-180-532 78 32 Fran ais Tel (a49) 0-180-532 93 58 Italiano Tel (a49) 0-180-534 16 80 National Semiconductor Hong Kong Ltd 13th Floor Straight Block Ocean Centre 5 Canton Rd Tsimshatsui Kowloon Hong Kong Tel (852) 2737-1600 Fax (852) 2736-9960 National Semiconductor Japan Ltd Tel 81-043-299-2309 Fax 81-043-299-2408 National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications