74LS126A

74LS126A NSC | Alldatasheet

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DM74LS126A Quad TRI-STATE Buffer September 1991 DM74LS126A Quad TRI-STATE É Buffer General Description This device contains four independent gates each of which performs a non-inverting buffer function. The outputs have the TRI-STATE feature. When enabled, the outputs exhibit the low impedance characteristics of a standard LS output with additional drive capability to permit the driving of bus lines without external resistors. When disabled, both the output transistors are turned off presenting a high-imped- ance state to the bus line. Thus the output will act neither as a significant load nor as a driver. To minimize the possibility that two outputs will attempt to take a common bus to oppo- site logic levels, the disable time is shorter than the enable time of the outputs. Connection Diagram Dual-In-Line Package TL/F/6388–1 Order Number DM74LS126AM or DM74LS126AN See NS Package Number M14A or N14A Function Table Y e A Inputs Output AC Y LH L HH H X L Hi-Z H e High Logic Level L e Low Logic Level X e Either Low or High Logic Level Hi-Z e TRI-STATE (Outputs are disabled) TRI-STATEÉ is a registered trademark of National Semiconductor Corporation. C1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.

Absolute Maximum Ratings (Note) Supply Voltage 7V Input Voltage 7V Operating Free Air Temperature Range 0 §Ct o a70§C Storage Temperature Range b65§Ct o a150§C Note: The ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaran- teed. 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 Parameter Min Nom Max Units VCC Supply Voltage 4.75 5 5.25 V VIH High Level Input Voltage V VIL Low Level Input Voltage 0.8 V IOH High Level Output Current b2.6 mA IOL Low Level Output Current 24 mA TA Free Air Operating Temperature 0 70 §C Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Conditions Min Typ Max Units(Note 1) VI Input Clamp Voltage V CC e Min, I I eb 18 mA b1.5 V VOH High Level Output V CC e Min, I OH e Max 2.4 VVoltage V IH e Min VOL Low Level Output V CC e Min, I OL e Max 0.35 0.5Voltage V IL e Max, V IH e Min V IOL e 12 mA, V CC e Min 0.25 0.4 II Input Current @ Max V CC e Max, V I e 7V 0.1 mAInput Voltage IIH High Level Input Current V CC e Max, V I e 2.7V 20 mA IIL Low Level Input V CC e Max, V I e 0.4V b0.4 mACurrent IOZH Off-State Output Current V CC e Max, V O e 2.4V with High Level Output V IH e Min, V IL e Max 20 mA Voltage Applied IOZL Off-State Output Current V CC e Max, V O e 0.4V with Low Level Output V IH e Min, V IL e Max b20 mA Voltage Applied IOS Short Circuit V CC e Max b20 b100 mAOutput Current (Note 2) ICC Supply Current V CC e Max 12 22 mA Note 1: All typicals are at V CC e 5V, T A e 25§C. Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second.

Switching Characteristics: DM74LS RL e 667X Symbol Parameter CL e 50 pF C L e 150 pF Units Min Max Min Max tPLH Propagation Delay Time Low 15 21 nsto High Level Output tPHL Propagation Delay Time High 18 22 nsto Low Level Output tPZH Output Enable Time to 30 36 nsHigh Level Output tPZL Output Enable Time to 30 42 nsLow Level Output tPHZ Output Disable Time from 25 nsHigh Level Output (Note 1) tPLZ Output Disable Time from 25 nsLow Level Output (Note 1) Note 1: CL e 5pF. Physical Dimensions inches (millimeters) 14-Lead Small Outline Molded Package (M) Order Number DM74LS126AM

DM74LS126A Quad TRI-STATE Buffer Physical Dimensions inches (millimeters) (Continued) 14-Lead Molded Dual-In-Line Package (N) Order Number DM74LS126AN 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 2. A critical component is any component of a life systems which, (a) are intended for surgical implant support device or system whose failure to perform can into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life failure to perform, when properly used in accordance support device or system, or to affect its safety or with instructions for use provided in the labeling, can effectiveness. be reasonably expected to result in a significant injury to the user. National Semiconductor National Semiconductor National Semiconductor National Semiconductor Corporation Europe Hong Kong Ltd. Japan Ltd.

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