74HC/HCT193 is a presettable synchronous 4-bit binary up/down counter, which features synchronous reversible 4-bit binary counting, asynchronous parallel load, asynchronous reset, expandable without external logic, standard output, MSI category.
The Philips 74HC/HCT193 is a high-speed Si-gate CMOS device designed as a presettable synchronous 4-bit binary up/down counter. It is pin compatible with low power Schottky TTL (LSTTL) and features separate up and down clock inputs to simplify operation. The device includes asynchronous parallel load and asynchronous reset capabilities, allowing for flexible initialization and clearing of the counter state.
| Propagation delay (CPp, CPy to Q) | 20 ns (HC), 20 ns (HCT) |
|---|---|
| Maximum clock frequency | 45 MHz (HC), 47 MHz (HCT) |
| Input capacitance | 3.5 pF |
| Power dissipation capacitance per package | 24 pF (HC), 26 pF (HCT) |
| Supply voltage range (HC) | GND to Vcc |
| Supply voltage range (HCT) | GND to Vcc - 1.5 V |
The device features synchronous reversible 4-bit binary counting, asynchronous parallel load, and asynchronous reset.
Counting up occurs when the CPy clock is pulsed while CPp is held HIGH; counting down occurs when the CPp clock is pulsed while CPy is held HIGH.
Yes, the device can be cleared at any time by the asynchronous master reset input (MR).