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 a 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.
Features
- 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
Specifications:
| Product Attribute | Symbol | Attribute Value |
| DC Supply Voltage Range | VDD | −0.5 to +18.0 V |
| Input or Output Voltage Range (DC or Transient) | Vin, Vout | −0.5 to VDD +0.5 |
| Input or Output Current (DC or Transient) per Pin | Iin, Iout | ±10mA |
| Power Dissipation | PD | 500mW |
| Ambient Temperature Range | TA | −55 to +125 °C |
| Package/Case: | PDIP-16 | |
| Mounting Style: | Through Hole | |
| Product Category | Multipliers / Dividers | |
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