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MC14521B-MC14521BD-MC14521BF-MC14521BFEL
24-Stage Frequency Divider
MC14521B
24-Stage Frequency Divider
The MC14521B consists of a chain of 24 flip–flops with an input
circuit that allows three modes of operation. The input will function as crystal oscillator, an RC oscillator, or as an input buffer for an
external oscillator. Each flip–flop divides the frequency of the
previous flip–flop by two, consequently this part will count up to 224 =
16,777,216. The count advances on the negative going edge of the
clock. The outputs of the last seven–stages are available for added
flexibility. All Stages are Resettable Reset Disables the RC Oscillator for Low Standby Power Drain RC and Crystal Oscillator Outputs Are Capable of Driving External
Loads Test Mode to Reduce Test Time VDD′ and VSS′ Pins Brought Out on Crystal Oscillator Inverter to
Allow the Connection of External Resistors for Low–Power
Operation Supply Voltage Range = 3.0 Vdc to 18 Vdc Capable of Driving Two Low–power TTL Loads or One Low–power
Schottky TTL Load over the Rated Temperature Range.
MAXIMUM RATINGS (Voltages Referenced to VSS) (Note 2.) Maximum Ratings are those values beyond which damage to the device
may occur. Temperature Derating:
Plastic “P and D/DW” Packages: – 7.0 mW/�C From 65�C To 125�C
This device contains protection circuitry to guard against damage due to high
static voltages or electric fields. However, precautions must be taken to avoid
applications of any voltage higher than maximum rated voltages to this
high–impedance circuit. For proper operation, Vin and Vout should be constrained
to the range VSS � (Vin or Vout) � VDD.
Unused inputs must always be tied to an appropriate logic voltage level (e.g.,
either VSS or VDD). Unused outputs must be left open.
