HEF4521B Description
The HEF4521B consists of a chain of 24 toggle flip-flops with an overriding asynchronous master reset input (MR), and an input circuit that allows three modes of operation. The single inverting stage (A2 to Y2) functions as: a crystal oscillator, an input buffer for an external oscillator or in bination with A1 as an RC oscillator.
HEF4521B Key Features
- Low power crystal oscillator operation
- Fully static operation
- 5 V, 10 V, and 15 V parametric ratings
- Standardized symmetrical output characteristics
- Specified from 40 C to +85 C
- plies with JEDEC standard JESD 13-B
- 30 March 2016
- 30 March 2016