SN54273, SN54LS273, SN74273, SN74LS273 OCTAL D-TYPE FLIP-FLOP WITH CLEAR is an eight-bit D flip-flop with single-rail outputs produced by Texas Instruments. It has buffered clock and direct clear inputs and individual data inputs to each flip-flop. This product can be applied to buffer/storage registers, shift registers and pattern generators.
The SN54273 series (including SN54LS273, SN74273, SN74LS273) are octal D‑type flip‑flops with a direct clear input. They are TTL devices used in buffer/storage registers, shift registers and pattern generators. The family provides individual data inputs, buffered clock, and clear functions.
Key characteristics include a typical supply voltage of 5 V, maximum clock frequency of 40 MHz, propagation delays of 18‑27 ns, and low power dissipation (≈3.9 mW per flip‑flop for the ‘273 version). Packages are offered in DW, J, N and W styles with pinouts shown for each.
| Supply voltage (typical) | 5 V |
|---|---|
| Maximum clock frequency | 40 MHz |
| High‑level output current (I_OH) | –800 µA |
| Low‑level output current (I_OL) | 16 mA |
| VIH (high‑level input voltage) | 2 V |
| VIL (low‑level input voltage) | 0.8 V |
| Propagation delay (high‑to‑low, clear) | 18–27 ns |
| Propagation delay (low‑to‑high, clock) | 17–27 ns |
The device can operate up to 40 MHz, with a typical maximum of 30 MHz.
A typical supply voltage is 5 V, with a specified range of 4.5 V to 5.5 V.
VIH is 2 V and VIL is typically 0.8 V (0.7 V to 0.8 V range).