DM74LS573 Octal D Latch with TRI-STATEE Outputs General Description Features The 'LS573 is a high speed octal latch with buffered common Latch Enable (LE) and buffered common Output Enable (OE) inputs. This device is functionally identical to the 'LS373, but has different pinouts. For truth tables, discussion of operations and AC and DC specifications, please refer to the 'LS373 data sheet. Y Connection Diagram Logic Symbol Y Y Y Y Inputs and outputs on opposite sides of package allowing easy interface with microprocessors Useful as input or output port for microprocessors Functionally identical to 'LS373 Input clamp diodes limit high speed termination effects Fully TTL and CMOS compatible Dual-In-Line Package TL/F/9814 - 2 VCC e Pin 20 GND e Pin 10 TL/F/9814 - 1 Order Number DM74LS573WM or DM74LS573N See NS Package Number M20B or N20A Pin Names D0-D7 LE OE O0-O7 Description Data Inputs Latch Enable Input (Active HIGH) TRI-STATE Output Enable Input (Active LOW) TRI-STATE Latch Outputs Function Table OUTPUT Enable Latch Enable D Output O L L L H H H L X H L X X H L QO Z L e Low State, H e High State, X e Don't Care Z e High Impedance State QO e Previous Condition of O TRI-STATEE is a registered trademark of National Semiconductor Corporation. C1995 National Semiconductor Corporation TL/F/9814 RRD-B30M115/Printed in U. S. A. DM74LS573 Octal D Latch with TRI-STATE Outputs June 1992 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 DM74LS Storage Temperature Range 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. 7V 7V 0 C to a 70 C b 65 C to a 150 C Recommended Operating Conditions Symbol DM74LS Parameter Units Min Nom Max 4.75 5 5.25 VCC Supply Voltage VIH High Level Input Voltage V VIL Low Level Input Voltage 0.8 V IOH High Level Input Current b 2.6 mA IOL Low Level Output Current 24 mA TA Free Air Operating Temperature 70 C 2 V 0 Electrical Characteristics Over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Conditions Min Typ (Note 1) Max Units b 1.5 V VI Input Clamp Voltage VCC e Min, II e b18 mA VOH High Level Output Voltage VCC e Min, IOH e Max, VIL e Max VOL Low Level Output Voltage VCC e Min, IOL e Max, VIH e Min 0.35 0.5 IOL e 4 mA, VCC e Min 0.25 0.4 2.7 VCC e Max, VI e 7V 3.4 V V II Input Current @ Max Input Voltage IIH High Level Input Current VCC e Max, VI e 2.7V 20 mA IIL Low Level Input Current VCC e Max, VI e 0.4V b 0.4 mA IOS Short Circuit Output Current VCC e Max (Note 2) b 130 mA ICC Supply Current VCC e Max 50 mA IOZH TRI-STATE Output off Current High VCC e VCCH VOZH e 2.7V 20 mA IOZL TRI-STATE Output off Current Low VCC e VCCH VOZL e 0.4V b 20 mA 1 b 30 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. 2 mA Switching Characteristics at VCC e 5V and TA e 25 C (see Section 1 for Test Waveforms and output loading) Symbol RL e 2 kX, CL e 50 pF Parameter Min Units Max tPLH tPHL Propagation Delay Data to Q 27 18 ns tPLH tPHL Propagation Delay LE to Q 36 25 ns tPZH tPZL TRI-STATE Enable Time OE to Q 20 25 ns tPHZ tPLZ TRI-STATE Enable Time OE to Q 20 25 ns ts(H) ts(L) Setup Time (High/Low) Data to LE 3 7 ns th(H) th(L) Hold Time (High/Low) Data to LE 10 10 ns tw(H) Pulse Width (High) Data to LE 15 ns Physical Dimensions inches (millimeters) 20-Lead Wide Small Outline Molded Package (M) Order Number DM74LS573WM NS Package Number M20B 3 DM74LS573 Octal D Latch with TRI-STATE Outputs Physical Dimensions inches (millimeters) (Continued) 20-Lead Molded Dual-In-Line Package (N) Order Number DM74LS573N NS Package Number N20A 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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