This document describes the features and characteristics of the 74HC/HCT93 4-bit binary ripple counter, including various counting modes, asynchronous master reset, etc.
The Philips 74HC/HCT93 is a high-speed Si-gate CMOS device that is pin compatible with low power Schottky TTL (LSTTL). It consists of four master-slave flip-flops internally connected to provide a divide-by-two section and a divide-by-eight section, functioning as a 4-bit binary ripple counter.
| Device Type | 4-bit binary ripple counter |
|---|---|
| Technology | high-speed Si-gate CMOS |
| Logic Category | MSI |
| Supply Voltage (HC) | GND to Vcc |
| Supply Voltage (HCT) | GND to Vcc - 1.5 V |
The device can operate as a 4-bit ripple counter or a 3-bit ripple counter by connecting the output Qo externally to input CPi.
The gated AND asynchronous master reset (MR, and MRg) overrides both clocks and resets all flip-flops.
No, state changes of the Qn outputs do not occur simultaneously because of internal ripple delays.