DM54LS259/DM74LS259 8-Bit Addressable Latches General Description Features These 8-bit addressable latches are designed for general purpose storage applications in digital systems. Specific uses include working registers, serial-holding registers, and active-high decoders or demultiplexers. They are multifunctional devices capable of storing single-line data in eight addressable latches, and being a 1-of-8 decoder or demultiplexer with active-high outputs. Four distinct modes of operation are selectable by controlling the clear and enable inputs as enumerated in the function table. In the addressable-latch mode, data at the datain terminal is written into the addressed latch. The addressed latch will follow the data input with all unaddressed latches remaining in their previous states. In the memory mode, all latches remain in their previous states and are unaffected by the data or address inputs. To eliminate the possibility of entering erroneous data in the latches, the enable should be held high (inactive) while the address lines are changing. In the 1-of-8 decoding or demultiplexing mode, the addressed output will follow the level of the D input with all other outputs low. In the clear mode, all outputs are low and unaffected by the address and data inputs. Y Connection Diagram Function Table Y Y Y Y Y Y Y Y Y 8-Bit parallel-out storage register performs serial-to-parallel conversion with storage Asynchronous parallel clear Active high decoder Enable/disable input simplifies expansion Direct replacement for Fairchild 9334 Expandable for N-bit applications Four distinct functional modes Typical propagation delay times: Enable-to-output 18 ns Data-to-output 16 ns Address-to-output 21 ns Clear-to-output 17 ns Fan-out IOL (sink current) 54LS259 4 mA 74LS259 8 mA IOH (source current) b0.4 mA Typical ICC 22 mA Inputs Dual-In-Line Package Clear E Output of Addressed Latch H H L L L H L H D Qi0 D L Each Other Output Function Qi0 Qi0 L L Addressable Latch Memory 8-Line Demultiplexer Clear Latch Selection Table Select Inputs TL/F/6418 – 1 Order Number DM54LS259E, DM54LS259J, DM54LS259W, DM74LS259M, DM74LS259WM or DM74LS259N See NS Package Number E20A, J16A, M16A, M16B, N16E or W16A C1995 National Semiconductor Corporation TL/F/6418 C B A Latch Addressed L L L L H H H H L L H H L L H H L H L H L H L H 0 1 2 3 4 5 6 7 H e High Level, L e Low Level D e the Level of the Data Input Qi0 e the Level of Qi (i e 0, 1, . . . 7, as Appropriate) before the Indicated Steady-State Input Conditions Were Established. RRD-B30M105/Printed in U. S. A. DM54LS259/DM74LS259 8-Bit Addressable Latches May 1992 Absolute Maximum Ratings (Note) 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. 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 DM54 DM74LS 0§ C to a 70§ C Storage Temperature Range b 65§ C to a 150§ C Recommended Operating Conditions Symbol DM54LS259 Parameter DM74LS259 Units Min Nom Max Min Nom Max 4.5 5 5.5 4.75 5 5.25 V 0.7 0.8 V VCC Supply Voltage VIH High Level Input Voltage VIL Low Level Input Voltage IOH High Level Output Current b 0.4 b 0.4 mA IOL Low Level Output Current 4 8 mA tW Pulse Width (Note 7) Enable 17 15 Clear 17 15 Setup Time (Notes 1, 2, 3 & 7) Data 20u 15u Select 15v 15v Hold Time (Notes 1, 2 & 7) Data 5u 2.5u Select 0u 2.5u tSU tH TA 2 Free Air Operating Temperature 2 b 55 125 V ns ns ns 0 70 §C Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Conditions Min Typ (Note 4) Max Units b 1.5 V VI Input Clamp Voltage VOH High Level Output Voltage VCC e Min, II e b18 mA VCC e Min, IOH e Max VIL e Max, VIH e Min Low Level Output Voltage VCC e Min, IOL e Max VIL e Max, VIH e Min DM54 DM74 0.35 0.5 IOL e 4 mA, VCC e Min DM74 0.25 0.4 Input Current @ Max Input Voltage VCC e Max, VI e 7V VI e 10V DM74 IIH High Level Input Current IIL VOL II IOS ICC DM54 2.5 DM74 2.7 V 3.4 0.4 V 0.1 mA VCC e Max, VI e 2.7V 20 mA Low Level Input Current VCC e Max, VI e 0.4V b 0.4 Enable VCC e Max, VI e 0.4V b 0.8 Short Circuit Output Current VCC e Max (Note 5) Supply Current VCC e Max (Note 6) Note 1: The symbols ( DM54 DM54 b 20 b 100 DM74 b 20 b 100 22 36 mA mA mA v, u) indicate the edge of the clock pulse used for reference: u for rising edge, v for falling edge. Note 2: Setup and hold times are with reference to the enable input. Note 3: The select-to-enable setup time is the time before the High-to-Low enable transition that the select must be stable so that the correct latch is selected and the others not affected. Note 4: All typicals are at VCC e 5V, TA e 25§ C. Note 5: Not more than one output should be shorted at a time, and the duration should not exceed one second. Note 6: ICC is measured with all inputs at 4.5V, and all outputs open. Note 7: TA e 25§ C and VCC e 5V. 2 Switching Characteristics at VCC e 5V and TA e 25§ C DM54LS DM74LS CL e 15 pF CL e 50 pF RL e 2 kX Parameter From (Input) To (Output) tPLH Propagation Delay Time Low to High Level Output Enable to Output 27 38 ns tPHL Propagation Delay Time High to Low Level Output Enable to Output 24 32 ns tPLH Propagation Delay Time Low to High Level Output Data to Output 30 35 ns tPHL Propagation Delay Time High to Low Level Output Data to Output 20 30 ns tPLH Propagation Delay Time Low to High Level Output Select to Output 30 41 ns tPHL Propagation Delay Time High to Low Level Output Select to Output 29 38 ns tPHL Propagation Delay Time High to Low Level Output Clear to Output 18 36 ns Symbol Min Physical Dimensions inches (millimeters) Ceramic Leadless Chip Carrier (E) Order Number DM54LS259E NS Package Number E20A 3 Max Min Units Max Physical Dimensions inches (millimeters) (Continued) 16-Lead Ceramic Dual-In-Line Package (J) Order Number DM54LS259J NS Package Number J16A 16-Lead Molded Package Small Outline (SO) Order Number DM74LS259M NS Package Number M16A 4 Physical Dimensions inches (millimeters) (Continued) 16-Lead Wide Small Outline Molded Package (M) Order Number DM74LS259WM NS Package Number M16B 16-Lead Molded Dual-In-Line Package (N) Order Number DM74LS259N NS Package Number N16E 5 DM54LS259/DM74LS259 8-Bit Addressable Latches Physical Dimensions inches (millimeters) (Continued) 16-Lead Ceramic Flat Package (W) Order Number DM54LS259W 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. 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