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54LS279 Dataheets PDF



Part Number 54LS279
Manufacturers National Semiconductor
Logo National Semiconductor
Description Quad S-R Latches
Datasheet 54LS279 Datasheet54LS279 Datasheet (PDF)

54LS279 DM54LS279 DM74LS279 Quad S-R Latches May 1989 54LS279 DM54LS279 DM74LS279 Quad S-R Latches General Description The ’LS279 consists of four individual and independent SetReset Latches with active low inputs Two of the four latches have an additonal S input ANDed with the primary S input A low on any S input while the R input is high will be stored in the latch and appear on the corresponding Q output as a high A low on the R input while the S input is high will clear the Q output to a l.

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54LS279 DM54LS279 DM74LS279 Quad S-R Latches May 1989 54LS279 DM54LS279 DM74LS279 Quad S-R Latches General Description The ’LS279 consists of four individual and independent SetReset Latches with active low inputs Two of the four latches have an additonal S input ANDed with the primary S input A low on any S input while the R input is high will be stored in the latch and appear on the corresponding Q output as a high A low on the R input while the S input is high will clear the Q output to a low Simultaneous transistion of the R and S inputs from low to high will cause the Q output to be indeterminate Both inputs are voltage level triggered and are not affected by transition time of the input data Features Y Alternate military aerospace device (54LS279) is available Contact a National Semiconductor Sales Office Distributor for specifications Connection Diagram Dual-In-Line Package www.DataSheet.net/ TL F 6420 – 1 Order Number 54LS279DMQB 54LS279FMQB 54LS279LMQB DM54LS279J DM74LS279M or DM74LS279N See NS Package Number E20A J16A M16A N16E or W16A Function Table Inputs S(1) L L H H H e High Level L e Low Level Q0 e The Level of Q before the indicated input conditions were established This output level is pseudo stable that is it may not persist when the S and R inputs return to their inactive (high) level Note 1 For latches with double S inputs H e both S inputs high L e one or both S inputs low Output R L H L H Q H H L Q0 C1995 National Semiconductor Corporation TL F 6420 RRD-B30M105 Printed in U S A Datasheet pdf - http://www.DataSheet4U.co.kr/ 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 7V Input Voltage 7V Operating Free Air Temperature Range b 55 C to a 125 C DM54LS and 54LS DM74LS 0 C to a 70 C Storage Temperature Range 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 device operation Recommended Operating Conditions Symbol VCC VIH VIL IOH IOL TA Parameter Min Supply Voltage High Level Input Voltage Low Level Input Voltage High Level Output Current Low Level Output Current Free Air Operating Temperature b 55 DM54LS279 Nom 5 Max 55 Min 4 75 2 07 b0 4 DM74LS279 Nom 5 Max 5 25 Units V V 08 b0 4 45 2 V mA mA C 4 125 0 8 70 Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol VI VOH Parameter Input Clamp Voltage High Level Output Voltage Low Level Output Voltage Conditions VCC e Min II e b18 mA VCC e Min IOH e Max VIL e Max VIH e Min VCC e Min IOL e Max VIL e Max VIH e Min IOL e 4 mA VCC e Min II IIH IIL IOS Input Current Input Voltage Max VCC e Max VI e 7V VCC e Max VI e 2 7V VCC e Max VI e 0 4V VCC e Max (Note 2) VCC e Max (Note 3) DM54 DM74 b 20 b 20 Min Typ (Note 1) Max b1 5 Units V V DM54 DM74 DM54 DM74 DM74 www.DataSheet.net/ 25 27 35 35 0 25 0 35 0 25 04 05 04 01 20 b0 4 b 100 b 100 VOL V mA mA mA mA mA High Level Input Current Low Level Input Current Short Circuit Output Current Supply Current ICC 38 7 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 R inputs grounded all S inputs at 4 5V and all outputs open 2 Datasheet pdf - http://www.DataSheet4U.co.kr/ Switching Characteristics at VCC e 5V and TA e 25 C (See Section 1 for Test Waveforms and Output Load) Symbol Parameter From (Input) To (Output) RL e 2 kX CL e 15 pF Min tPLH tPHL tPHL Propagation Delay Time Low to High Level Output Propagation Delay Time High to Low Level Output Propagation Delay Time High to Low Level Output S to Q S to Q R to Q Max 22 15 27 CL e 50 pF Min Max 25 23 33 ns ns ns Units www.DataSheet.net/ 3 Datasheet pdf - http://www.DataSheet4U.co.kr/ Physical Dimensions inches (millimeters) Ceramic Leadless Chip Carrier Package (E) Order Number 54LS279LMQB NS Package Number E20A www.DataSheet.net/ 16-Lead Ceramic Dual-In-Line Package (J) Order Number 54LS279DMQB or DM54LS279J NS Package Number J16A 4 Datasheet pdf - http://www.DataSheet4U.co.kr/ Physical Dimensions inches (millimeters) (Continued) 16-Lead Small Outline Molded Package (M) Order Number DM74LS279M NS Package Number M16A www.DataSheet.net/ 16-Lead Molded Dual-In-Line Package (N) Order Number DM74LS279N NS Package Number N16E 5 Datasheet pdf - http://www.DataSheet4U.co.kr/ 54LS279 DM54LS279 DM74LS279 Quad S-R Latches Physical Dimensions inches (millimeters) (Continued) 16-Lead Ceramic Flat Package (W) Order Number 54LS279FMQB.


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