The 74VHC393 is a dual 4-bit binary counter with features such as high speed, low power dissipation, and high noise immunity. It is fabricated with silicon gate CMOS technology and can achieve 8-bit binary counting or frequency division. The device changes state on the negative going transition of the CLOCK pulse and can be reset to '0' by a HIGH at the CLEAR input. It is suitable for interfacing 5V to 3V systems and two supply systems such as battery backup.
The 74VHC393 is a high‑speed CMOS dual 4‑bit binary counter that changes state on the negative‑going clock edge and includes power‑down protection on all inputs. It is pin‑compatible with the 74HC393 and can be used to interface 5 V to 3 V systems or dual‑supply configurations.
Key specifications include a typical 170 MHz maximum clock frequency, a supply range of 2.0 V to 5.5 V for normal operation, and various package options (SOIC, SOP, TSSOP). The device offers low quiescent current and detailed electrical characteristics for both DC and AC operation.
| Maximum clock frequency | 170 MHz (typ.) |
|---|---|
| Power dissipation (max) | 4 µA (max) at 25 °C |
| Supply voltage (absolute max) | -0.5 V to +7.0 V |
| Supply voltage (recommended) | 2.0 V to +5.5 V |
The device is rated for operation up to +85 °C.
Yes, power‑down protection is provided on all inputs.
Yes, the packages are lead‑free per JEDEC J‑STD‑020B.