SN74AS74A Dual Positive-Edge-Triggered D-Type Flip-Flops With Preset And Clear |

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Dual Positive-Edge-Triggered D-Type Flip-Flops With Preset And Clear



These devices contain two independent positive-edge-triggered D-type flip-flops. A low level at the preset () or clear () inputs sets or resets the outputs regardless of the levels of the other inputs. When and are inactive (high), data at the data (D) input meeting the setup-time requirements are transferred to the outputs on the positive-going edge of the clock (CLK) pulse. Clock triggering occurs at a voltage level and is not directly related to the rise time of CLK. Following the hold-time interval, data at the D input can be changed without affecting the levels at the outputs.

The SN54ALS74A and SN54AS74A are characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ALS74A and SN74AS74A are characterized for operation from 0°C to 70°C.



  • Package Options Include Plastic Small-Outline (D) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs


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Part number Order Technology Family Input type Output type VCC (Min) (V) VCC (Max) (V) IOL (Max) (mA) IOH (Max) (mA) Rating Package Group
SN74AS74A Order now AS     Bipolar     Push-Pull     4.5     5.5     20     -2     Catalog     PDIP | 14
SOIC | 14
SO | 14    
SN54AS74A Samples not available AS     Bipolar     Push-Pull     4.5     5.5     20     -2     Military     CDIP | 14