DM74LS125A Quad 3-STATE Buffer August 1986 Revised March 2000 DM74LS125A Quad 3-STATE Buffer General Description This device contains four independent gates each of which performs a non-inverting buffer function. The outputs have the 3-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-impedance 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 opposite logic levels, the disable time is shorter than the enable time of the outputs. Ordering Code: Order Number DM74LS125AM DM74LS125ASJ DM74LS125AN Package Number M14A M14D N14A Package Description 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0. 150 Narrow 14-Lead Small Outline Package (SOP), EIAJ TYPE II, 5. 3mm Wide 14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0. 00 Wide Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagram Function Table Y=A Inputs A L H X C L L H
Note 1: 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 tables 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 Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Current LOW Level Output Current Free Air Operating Temperature 0 Parameter Min 4. 5 2 0. 8 ? 2. 6 24 70 Nom 5 Max 5. 25 Units V V V mA mA °C Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol VI VOH VOL Parameter Input Clamp Voltage HIGH Level Output Voltage LOW Level Output Voltage II IIH IIL IOZH IOZL IOS ICC Input Current @ Max Input Voltage HIGH Level Input Current LOW Level Input Current Off-State Output Current with HIGH Level Output Voltage Applied Off-State Output Current with LOW Level Output Voltage Applied Short Circuit Output Current Supply Current Conditions VCC = Min, II = ? 8 mA VCC = Min, IOH = Max VIL = Max, VIH = Min VCC = Min, IOL = Max VIL = Max IOL = 12 mA, VCC = Min VCC = Max, VI = 7V VCC = Max, VI = 2. 7V VCC = Max, VI = 0. 4V VCC = Max, VO = 2. 4V VIH = Min, VIL = Max VCC = Max, VO = 0. 4V VIH = Min, VIL = Max VCC = Max (Note 3) VCC = Max (Note 4) ? 20 11 2. 4 3. 4 0. 35 0. 25 0. 5 0. 4 0. 1 20 ? 0. 4 20 ? 20 ? 100 20 mA µA mA µA µA mA mA Min Typ (Note 2) Max ? 1. 5 Units V V V Note 2: All typicals are at VCC = 5V, TA = 25°C. Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 4: ICC is measured with the data control (C) inputs at 4. 5V and the data inputs grounded. Switching Characteristics at VCC = 5V and TA = 25°C RL = 667? Symbol Parameter CL = 50 pF Min tPLH tPHL tPZH tPZL tPHZ tPLZ Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Output Enable Time to HIGH Level Output Output Enable Time to LOW Level Output Output Disable Time from HIGH Level Output (Note 5) Output Disable Time from LOW Level Output (Note 5) Max 15 18 25 25 20 20 CL = 150 pF Min Max 21 22 35 40 ns ns ns ns ns ns Units
Note 5: CL = 5pF. www. fairchildsemi. com 2 DM74LS125A Physical Dimensions inches (millimeters) unless otherwise noted 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0. 150 Narrow Package Number M14A 3 www. fairchildsemi. com DM74LS125A Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 14-Lead Small Outline Package (SOP), EIAJ TYPE II, 5. 3mm Wide Package Number M14D www. fairchildsemi. com 4 DM74LS125A Quad 3-STATE Buffer Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 4-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0. 300 Wide Package Number N14A Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. LIFE SUPPORT POLICY FAIRCHILD’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 FAIRCHILD 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 (c) 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. 5 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www. fairchildsemi. com www. fairchildsemi. com