DM74LS375 4-Bit Latch General Description The ’LS375 is a 4-bit D-type latch for use as temporary storage for binary information between processing units and input/output or indicator units. When its Enable (E) input is HIGH, a latch is transparent, i.e., the Q output will follow the D input each time it changes. When E is LOW a latch stores the last valid data present on the D input preceding the HIGH-to-LOW transition of E. The ’LS375 is functionally identical to the ’LS75 except for the corner power pins. Connection Diagram Logic Symbol Dual-In-Line Package TL/F/9830 – 2 VCC e Pin 16 GND e Pin 8 TL/F/9830 – 1 Order Number DM74LS375M or DM74LS375N See NS Package Number M16A or N16E Pin Name D1–D4 E1, 2 E3, 4 Q1–Q4 Q1–Q4 C1995 National Semiconductor Corporation TL/F/9830 Description Data Inputs Latches 1, 2 Enable Inputs Latches 3, 4 Enable Inputs Latch Outputs Complementary Latch Outputs RRD-B30M115/Printed in U. S. A. DM74LS375 4-Bit Latch February 1992 Absolute Maximum Ratings (Note) Supply Voltage 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 Input Voltage Operating Free Air Temperature Range Storage Temperature Range 7V 0§ C to a 70§ C b 65§ C to a 150§ C Recommended Operating Conditions Symbol Parameter Min Nom Max 4.75 5 5.25 Units VCC Supply Voltage VIH High Level Input Voltage V VIL Low Level Input Voltage IOH High Level Output Current IOL Low Level Output Current TA Free Air Operating Temperature 0 ts (H) ts (L) Setup Time HIGH or LOW Dn to En 20 ns th (H) th (L) Hold Time HIGH or LOW Dn to En 0 ns tw (H) En Pulse Width HIGH 20 ns 2 V 0.8 V b 0.4 mA 8 mA 70 §C Electrical Characteristics Over recommended operating free air temperature range (unless otherwise noted) Symbol VI Parameter Conditions Min Typ (Note 1) Max Units b 1.5 V 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 II Input Current @ Max Input Voltage VCC e Max, VI e 7V IIH High Level Input Current IIL 2.7 3.4 V V Others 0.1 mA Enable Input 0.4 mA VCC e Max, VI e 2.7V Others 20 mA Low Level Input Current VCC e Max, VI e 0.4V Others IOS Short Circuit Output Current VCC e Max (Note 2) ICC Supply Current VCC e Max Enable Input Enable Input b 20 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 80 mA b 0.4 mA b 1.2 mA b 100 mA 12 mA Switching Characteristics VCC e a 5.0V, TA e a 25§ C Symbol CL e 15 pF Parameter Min Units Max tPLH tPHL Propagation Delay Dn to Qn 27 23 ns tPLH tPHL Propagation Delay Dn to Qn 20 15 ns tPLH tPHL Propagation Delay En to Qn 27 25 ns tPLH tPHL Propagation Delay En to Qn 30 18 ns Truth Table (Each Latch) tn tn a 1 D Q H L H L tn e Bit time before Enable negative going transition. tn a 1 e Bit time after Enable negative going transition. H e HIGH Voltage Level L e LOW Voltage Level Logic Diagram (1/4 of diagram shown) TL/F/9830 – 3 3 4 Physical Dimensions inches (millimeters) 16-Lead Small Outline Molded Package (M) Order Number DM74LS375M NS Package Number M16A 5 DM74LS375 4-Bit Latch Physical Dimensions inches (millimeters) (Continued) 16-Lead Molded Dual-In-Line Package (N) Order Number DM74LS375N NS Package Number N16E 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. 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