8-Input Data Selector/ Multiplexer with 3-State Outputs HighPerformance SiliconGate CMOS MC74HC251A www.onsemi.com The MC54/74HC251 is identical in pinout to the LS251. The device inputs are compatible with standard CMOS outputs with pullup MARKING resistors, they are compatible with LSTTL outputs. DIAGRAMS This device selects one of the eight binary Data Inputs, as 16 determined by the Address Inputs. The Output Enable pin must be a SOIC16 HC251AG low level for the selected data to appear at the outputs. If Output D SUFFIX 16 AWLYWW Enable is high, both the Y and the Y outputs are in the CASE 751B 1 highimpedance state. This 3state feature allows the HC251 to be 1 16 used in busoriented systems. The HC251 is similar in function to the HC251 which does not have TSSOP16 HC 3state outputs. 16 251A DT SUFFIX ALYW CASE 948F Features 1 Output Drive Capability: 10 LSTTL Loads 1 A = Assembly Location Outputs Directly Interface to CMOS, NMOS, and TTL WL, L = Wafer Lot Operating Voltage Range: 2 to 6 V YY, Y = Year WW, W = Work Week Low Input Current: 1 A G or = PbFree Package High Noise Immunity Characteristic of CMOS Devices (Note: Microdot may be in either location) NLV Prefix for Automotive and Other Applications Requiring PIN ASSIGNMENT Unique Site and Control Change Requirements AECQ100 Qualified and PPAP Capable D3 1 16 V CC These Devices are PbFree, Halogen Free/BFR Free and are RoHS D2 2 15 D4 Compliant D1 3 14 D5 D0 4 13 D6 Y 5 12 D7 Y 6 11 A0 OUTPUT 7 10 A1 ENABLE GND 8 9 A2 ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 6 of this data sheet. Semiconductor Components Industries, LLC, 2010 1 Publication Order Number: January, 2020 Rev. 1 MC74HC251A/DMC74HC251A FUNCTION TABLE 4 D0 3 Inputs Outputs D1 5 2 Y Output D2 A2 A1 A0 Enabled Y Y 1 D3 DATA DATA 15 INPUTS X X X H Z Z OUTPUTS D4 L L L L D0 D0 14 6 D5 Y L L H L D1 D1 13 L H L L D2 D2 D6 L H H L D3 D3 12 D7 H L L L D4 D4 H L H L D5 D5 11 H H L L D6 D6 A0 ADDRESS H H H L D7 D7 10 A1 INPUTS 9 Z = high impedance A2 D0, D1, , D7 = the level of the respective 7 OUTPUT ENABLE D input. PIN 16 = V CC PIN 8 = GND Figure 1. Logic Diagram MAXIMUM RATINGS Symbol Parameter Value Unit This device contains protection circuitry to guard against damage V DC Supply Voltage (Referenced to GND) 0.5 to + 7.0 V CC due to high static voltages or electric V DC Input Voltage (Referenced to GND) 1.5 to V + 1.5 V fields. However, precautions must in CC be taken to avoid applications of any V DC Output Voltage (Referenced to GND) 0.5 to V + 0.5 V out CC voltage higher than maximum rated I DC Input Current, per Pin 25 mA voltages to this highimpedance cir- in cuit. For proper operation, V and in I DC Output Current, per Pin 50 mA out V should be constrained to the out range GND (V or V ) V . I DC Supply Current, V and GND Pins 75 mA CC CC in out CC Unused inputs must always be P Power Dissipation in Still Air SOIC Package 500 mW D tied to an appropriate logic voltage TSSOP Package TBD level (e.g., either GND or V ). CC Unused outputs must be left open. T Storage Temperature 65 to + 150 C stg Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected. RECOMMENDED OPERATING CONDITIONS Symbol Parameter Min Max Unit V DC Supply Voltage (Referenced to GND) 2.0 6.0 V CC V , V DC Input Voltage, Output Voltage (Referenced to GND) 0 V V in out CC T Operating Temperature, All Package Types 55 +125 C A t , t Input Rise and Fall Time V = 2.0 V 0 1000 ns r f CC (Figure 2) V = 4.5 V 0 500 CC V = 6.0 V 0 400 CC Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond the Recommended Operating Ranges limits may affect device reliability. www.onsemi.com 2