24-stage frequency divider and oscillator
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 (I2/O2) will function as a crystal
oscillator, or in combination with I1 as an RC oscillator, or
as an input buffer for an external oscillator. Low-power
operation as a crystal oscillator is enabled by connecting
external resistors to pins 3 (VSS’) and 5 (VDD’).
Each flip-flop divides the frequency of the previous flip-flop
by two, consequently the HEF4521B will count up to
224 = 16777216. The counting advances on the HIGH to
LOW transition of the clock (I2). The outputs of the last
seven stages are available for additional flexibility.
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