DM74ALS74AMX

Revised February 2000 DM74ALS74A Dual D Positive-Edge-Triggered Flip-Flop with Preset and Clear General Description Features The DM74ALS74A contains two independent positive edge-triggered flip-flops. Each flip-flop has individual D, clock, clear and preset inputs, and also complementary Q and Q outputs. ■ Switching specifications at 50 pF Information at input D is transferred to the Q output on the positive going edge of the clock pulse. Clock triggering occurs at a voltage level of the clock pulse and is not directly related to the transition time of the positive going pulse. When the clock input is at either the HIGH or LOW level, the D input signal has no effect. ■ Switching specifications guaranteed over full temperature and VCC range ■ Advanced oxide-isolated, ion-implanted Schottky TTL process ■ Functionally and pin-for-pin compatible with Schottky and LS TTL counterpart ■ Improved AC performance over LS74 at approximately half the power Asynchronous preset and clear inputs will set or clear Q output respectively upon the application of low level signal. Ordering Code: Order Number Package Number Package Description DM74ALS74AM M14A DM74ALS74ASJ M14D 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow 14-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide DM74ALS74AN N14A 14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagram Function Table Inputs Outputs PR CLR CLK D Q L H X X H Q L H L X X L H H (Note 1) L L X X H (Note 1) H H ↑ H H L H H ↑ L L H H H L X Q0 Q0 L = LOW State H = HIGH State X = Don't Care ↑ = Positive Edge Transition Q0 = Previous Condition of Q Note 1: This condition is nonstable; it will not persist when preset and clear inputs return to their inactive (HIGH) level. The output levels in this condition are not guaranteed to meet the VOH specification. © 2000 Fairchild Semiconductor Corporation DS006109 www.fairchildsemi.com DM74ALS74A Dual D Positive-Edge-Triggered Flip-Flop with Preset and Clear September 1986 DM74ALS74A Logic Diagram www.fairchildsemi.com 2 Supply Voltage 7V Input Voltage 7V 0°C to +70°C Operating Free Air Temperature Range Note 2: 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. −65°C to +150°C Storage Temperature Range Typical θJA N Package 87.0°C/W M Package 117.0°C/W Recommended Operating Conditions Symbol Parameter Min Nom Max Units 4.5 5 5.5 V VCC Supply Voltage VIH HIGH Level Input Voltage VIL LOW Level Input Voltage 0.8 V mA 2 V IOH HIGH Level Output Current −0.4 IOL LOW Level Output Current 8 mA fCLK Clock Frequency 34 MHz tW(CLK) Width of Clock Pulse tW Pulse Width Preset & Clear tSU Data Setup Time 0 HIGH 14.5 ns LOW 14.5 ns LOW 14.5 ns Data 15↑ (Note 3) PRE or CLR tH Data Hold Time TA Free Air Operating Temperature ns 10↑ (Note 3) Inactive 0↑ (Note 3) 0 ns 70 °C Note 3: The (↑) arrow indicates the positive edge of the Clock is used for reference. 3 www.fairchildsemi.com DM74ALS74A Absolute Maximum Ratings(Note 2) DM74ALS74A Electrical Characteristics over recommended operating free air temperature range. All typical values are measured at VCC = 5V, TA = 25°C. Symbol Parameter Conditions VIK Input Clamp Voltage VCC = 4.5V, II = −18 mA VOH HIGH Level IOH = −0.4 mA Output Voltage VCC = 4.5V to 5.5V LOW Level VCC = 4.5V Output Voltage VIH = 2V VOL II IIH IIL Min Typ Max Units −1.5 V VCC − 2 IOL = 8 mA V 0.35 0.5 Input Current @ VCC = 5.5V, Clock, D 0.1 Max Input Voltage VIH = 7V Preset, Clear 0.2 HIGH Level VCC = 5.5V, Clock, D 20 Input Current VIH = 2.7V Preset, Clear 40 LOW Level VCC = 5.5V, Clock, D −0.2 Input Current VIL = 0.4V Preset, Clear (Note 5) −0.4 IO Output Drive Current VCC = 5.5V, VO = 2.25V ICC Supply Current VCC = 5.5V (Note 4) −30 2.4 V mA µA mA −112 mA 4 mA Note 4: ICC is measured with D, CLK and PRESET grounded, then with D, CLK and CLEAR grounded. Note 5: IIL PRE and CLR pins not guaranteed to meet specifications with both PRE and CLK LOW. Switching Characteristics over recommended operating free air temperature range. Parameter Conditions From To Min Max Units fMAX VCC = 4.5V to 5.5V 34 tPLH RL = 500Ω 3 13 ns tPHL CL = 50 pF 5 15 ns 5 16 ns 5 18 ns tPLH tPHL www.fairchildsemi.com Preset or Clear Clock Q or Q Q or Q 4 MHz DM74ALS74A Physical Dimensions inches (millimeters) unless otherwise noted 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow Package Number M14A 5 www.fairchildsemi.com DM74ALS74A 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 6 DM74ALS74A Dual D Positive-Edge-Triggered Flip-Flop with Preset and Clear Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 14-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: 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. 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. www.fairchildsemi.com 7 www.fairchildsemi.com