| 54ACTQ821 | National Semiconductor | Quiet Series 10-Bit D Flip-Flop with TRI-STATE Outputs |
| 54ACTQ821LMQB | National Semiconductor | Quiet Series 10-Bit D Flip-Flop with TRI-STATE Outputs |
| 54ACTQ821SDMQB | National Semiconductor | Quiet Series 10-Bit D Flip-Flop with TRI-STATE Outputs |
| 54ACTQ821FMQB | National Semiconductor | Quiet Series 10-Bit D Flip-Flop with TRI-STATE Outputs |