The 54LS74 by National Semiconductor is a Dual Positive-Edge-Triggered D Flip-Flops. Below is the official datasheet preview.
| Part number | 54LS74 |
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| Manufacturer | National Semiconductor |
| File Size | 118.97 KB |
| Description | Dual Positive-Edge-Triggered D Flip-Flops |
| Datasheet |
 54LS74_NationalSemiconductor.pdf
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This device contains two independent positive-edge-triggered D flip-flops with complementary outputs The information on the D input is accepted by the flip-flops on the positive going edge of the clock pulse The triggering occurs at a voltage level and is not directly related to the transition time of the rising edge of the clock The data on the D input may be changed while the clock is low or high without affecting the outputs as long as the data setup and hold times are not violated A low log
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