TECHNICAL DATA IN74ALS74 Dual D Flip-Flop with Set and Reset Each of the two independent positive edge-triggered flip-flops in this circuit has individual Data, Clock, Set and Reset inputs, and complementary Q and Q outputs. * Switching specifications at 50 pF * Switching specifications guaranteed over full temperature and VCC range * Functionally and pin-for-pin compatible with Schottky and LS TTL counterpart * Improved AC performance over LS74 at approximately half the power ORDERING INFORMATION IN74ALS74N Plastic IN74ALS74D SOIC TA = -10 to 70 C for all packages PIN ASSIGNMENT LOGIC DIAGRAM FUNCTION TABLE Inputs PIN 14 =VCC PIN 7 = GND Outputs Set Reset Clock Data Q Q L H X X H L H L X X L H L L H X * H* X H H H H L H H L L H H H L X No Change H H H X No Change H H X No Change *Both outputs will remain high as long as Set and Reset are low, but the output states are unpredictable if Set and Reset go high simultaneously. X = don't care 1 IN74ALS74 MAXIMUM RATINGS* Symbol Parameter Value Unit VCC Supply Voltage 7.0 V VIN Input Voltage 7.0 V VOUT Output Voltage 5.5 V Tstg Storage Temperature Range -65 to +150 C * Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions. RECOMMENDED OPERATING CONDITIONS Symbol Parameter Min Max Unit 5.5 V VCC Supply Voltage 4.5 VIH High Level Input Voltage 2.0 VIL Low Level Input Voltage 0.8 V IOH High Level Output Current -0.4 mA IOL Low Level Output Current 8.0 mA TA Ambient Temperature Range +70 C -10 V DC ELECTRICAL CHARACTERISTICS over full operating conditions Guaranteed Limit Symbol Parameter Test Conditions Min Max Unit -1.5 V VIK Input Clamp Voltage VCC = min, IIN = -18 mA VOH High Level Output Voltage VCC = min, IOH = -0.4 mA VOL Low Level Output Voltage VCC = min, IOL = 4 mA 0.4 VCC = min, IOL = 8 mA 0.5 VCC = max, VIN = 2.7 V 20 A VCC = max, VIN = 7.0 V 0.1 mA VCC = max, Clock, Data -0.2 mA VIN = 0.4 V Reset, Set -0.4 IIH IIL High Level Input Current Low Level Input Current IO Output Short Circuit Current VCC = max, VO = 2.25 V ICC Supply Current VCC = max (Note 1) 2.5 -15 V -70 mA 4.0 mA Note 1. ICC is measured with Data, Clock and Reset grounded, then with Data, Clock and Set grounded. 2 V IN74ALS74 AC ELECTRICAL CHARACTERISTICS over full operating conditions (VCC = 5.0 V10%, CL = 50 pF, RL = 500 , Input tr = tf = 2.0 ns) Symbol Parameter Min Max Unit fmax Maximum Clock Frequency 30 MHz tPLH Propagation Delay Time, Clock to Q or Q 16 ns tPHL Propagation Delay Time, Clock to Q or Q 18 ns tPLH Propagation Delay Time, Set or Reset to Q or Q 13 ns tPHL Propagation Delay Time, Set or Reset to Q or Q 15 ns tsu Setup Time, Data to Clock 15 ns th Hold Time, Clock to Data 0 ns trec Recovery Time, Set or Reset Inactive to Clock 10 ns tw Pulse Width, Clock 14.5 ns tw Pulse Width, Set or Reset 15 ns Figure 1. Switching Waveforms Figure 2. Switching Waveforms * Includes all probe and jig capacitance Figure 3. Switching Waveforms Figure 4. Test Circuit 3