54298

54298 Quad 2-Port Register (Multiplexer With Storage) June 1989 54298 Quad 2-Port Register (Multiplexer With Storage) General Description The ’298 is a quad 2-port register It is the logical equivalent of a quad 2-input multiplexer followed by a quad 4-bit edgetriggered register A Common Select input selects between two 4-bit input ports (data sources) The selected data is transferred to the output register synchronous with the HIGH-to-LOW transition of the Clock input Features Y Y Select from two data sources Fully edge-triggered operation Connection Diagram Logic Symbol Dual-In-Line Package TL F 10215 – 2 VCC e Pin 16 GND e Pin 8 TL F 10215 – 1 Order Number 54298DMQB or 54298FMQB See NS Package Number J16A or W16A Pin Names S CP I0a–I0d I1a–I1d Qa Qd Description Common Select Input Clock Pulse Input (Active Falling Edge) Source 0 Data Inputs Source 1 Data Inputs Flip-Flop Outputs C1995 National Semiconductor Corporation TL F 10215 RRD-B30M105 Printed in U S A Absolute Maximum Ratings (Note) If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage Input Voltage Operating Free Air Temperature Range Storage Temperature Range 7V 5 5V b 55 C to a 125 C b 65 C to a 150 C 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 ‘‘Electrical Characteristics’’ table are not guaranteed at the absolute maximum ratings The ‘‘Recommended Operating Conditions’’ table will define the conditions for actual operation Recommended Operating Conditions Symbol VCC VIH VIL IOH IOL TA ts (H) ts (L) th (H) th (L) ts (H) ts (L) th (H) th (L) tw (H) tw (L) Parameter Min Supply Voltage High Level Input Voltage Low Level Input Voltage High Level Output Current Low Level Output Current Free Air Operating Temperature Setup Time HIGH or LOW S to CP Hold Time HIGH or LOW S to CP Setup Time HIGH or LOW I0x or I1x to CP Hold Time HIGH or LOW I0x or I1x to CP CP Pulse Width HIGH or LOW b 55 54298 Nom 5 Max 55 Units V V 08 b0 8 45 2 V mA mA C ns ns ns ns ns 16 125 25 25 0 0 15 15 50 50 20 20 Electrical Characteristics over recommended operating free air temperature (unless otherwise noted) Symbol VI VOH VOL II IIH IIL IOS ICC Parameter Input Clamp Voltage High Level Output Voltage Low Level Output Voltage Input Current Max Input Voltage High Level Input Current Low Level Input Current Short Circuit Output Current Supply Current Conditions VCC e Min II e b12 mA VCC e Min IOH e Max VIL e Max VIH e Min VCC e Min IOL e Max VIH e Min VIL e Max VCC e Max VI e 5 5V VCC e Max VI e 2 4V VCC e Max VI e 0 4V VCC e Max (Note 2) VCC e Max (Note 3) 24 04 1 40 b1 6 b 20 b 57 Min Typ (Note 1) Max b1 5 Units V V V mA mA mA mA mA 65 Note 1 All typicals are at VCC e 5V TA e 25 C Note 2 Not more than one output should be shorted at a time and the duration should not exceed one second Note 3 ICC is measured with all outputs open and all inputs grounded 2 Switching Characteristics VCC e a 5 0V Symbol Parameter TA e a 25 C (See Section 1 for test waveforms and output load) CL e 15 pF RL e 400X Min Max 27 32 ns Units tPLH tPHL Propagation Delay CP to Qn Functional Description This device is a high speed quad 2-port register It selects four bits of data from two sources (ports) under the control of a Common Select input (S) The selected data is transferred to the 4-bit output register synchronous with the HIGH-to-LOW transition of the Clock input (CP) The 4-bit output register is fully edge-triggered The Data inputs (Inx) and Select input (S) need be stable only one setup time prior to the HIGH-to-LOW transition of the clock for predictable operation Truth Table Inputs S I I h h I0x I h X X I1x X X l h Output Qx L H L H l e LOW Voltage Level one setup time prior to the HIGH-to-LOWclock transition h e HIGH Voltage Level one setup time prior to the HIGH-to-LOW clock transition H e HIGH Voltage level L e LOW Voltage level X e Immaterial Logic Diagram TL F 10215 – 3 3 54298 Quad 2-Port Register (Multiplexer With Storage) Physical Dimensions inches (millimeters) 16-Lead Ceramic Dual-In-Line Package (J) Order Number 54298DMQB NS Package Number J16A 16-Lead Ceramic Flat Package (W) Order Number 54298FMQB NS Package Number W16A 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