DM74ALS74A Dual D Positive-Edge-Triggered Flip-Flop with Preset and Clear September 1986 Revised February 2000 DM74ALS74A Dual D Positive-Edge-Triggered Flip-Flop with Preset and Clear General Description Features The DM74ALS74A contains two independent positive Switching specifications at 50 pF edge-triggered flip-flops. Each flip-flop has individual D, Switching specifications guaranteed over full tempera- clock, clear and preset inputs, and also complementary Q ture and V range CC and Q outputs. Advanced oxide-isolated, ion-implanted Schottky TTL Information at input D is transferred to the Q output on the process positive going edge of the clock pulse. Clock triggering Functionally and pin-for-pin compatible with Schottky occurs at a voltage level of the clock pulse and is not and LS TTL counterpart directly related to the transition time of the positive going Improved AC performance over LS74 at approximately pulse. When the clock input is at either the HIGH or LOW half the power level, the D input signal has no effect. 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 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow DM74ALS74ASJ M14D 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 Q LH X X H L HL X X L H L L X X H (Note 1) H (Note 1) HH HH L HH LL H HH L X Q Q 0 0 L = LOW State H = HIGH State X = Don t Care = Positive Edge Transition Q = Previous Condition of Q 0 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 condi- tion are not guaranteed to meet the V specification. OH 2000 Fairchild Semiconductor Corporation DS006109 www.fairchildsemi.comLogic Diagram www.fairchildsemi.com 2 DM74ALS74A