Overview
The MC14521BDR2G, produced by ON Semiconductor, is a 24-stage frequency divider integrated circuit. This device consists of a chain of 24 flip-flops, allowing it to divide the frequency of the input signal by 2^24, resulting in a maximum count capacity of 16,777,216. The input circuit supports three modes of operation: as a crystal oscillator, an RC oscillator, or as an input buffer for an external oscillator. The count advances on the negative-going edge of the clock, and the outputs of the last seven stages are available for added flexibility.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| DC Supply Voltage Range | VDD | -0.5 | - | 18.0 | V |
| Input or Output Voltage Range (DC or Transient) | Vin, Vout | -0.5 | - | VDD + 0.5 | V |
| Input or Output Current (DC or Transient) per Pin | Iin, Iout | -10 | - | 10 | mA |
| Power Dissipation, per Package | PD | - | - | 500 | mW |
| Ambient Temperature Range | TA | -55 | - | 125 | °C |
| Storage Temperature Range | Tstg | -65 | - | 150 | °C |
| Lead Temperature (8-Second Soldering) | TL | - | - | 260 | °C |
| Output Rise and Fall Time (Counter Outputs) | tTLH, tTHL | 100 | 50 | 40 | ns |
| Propagation Delay Time (Clock to Q24) | tPHL, tPLH | 4415 + (1.7 ns/pF) CL | 1667 + (0.66 ns/pF) CL | 1275 + (0.5 ns/pF) CL | ns |
Key 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.
- NLV prefix for automotive and other applications requiring unique site and control change requirements; AEC-Q100 qualified and PPAP capable.
- Pb-free and RoHS compliant.
Applications
The MC14521BDR2G is suitable for various applications requiring precise frequency division, such as:
- Telecommunication systems.
- Timing and clock generation circuits.
- Automotive systems (due to AEC-Q100 qualification).
- Industrial control systems.
- Consumer electronics requiring frequency division.
Q & A
- What is the maximum count capacity of the MC14521BDR2G?
The maximum count capacity is 2^24, which equals 16,777,216.
- What are the three modes of operation for the input circuit?
The input circuit can function as a crystal oscillator, an RC oscillator, or as an input buffer for an external oscillator.
- What is the supply voltage range for the MC14521BDR2G?
The supply voltage range is from 3.0 Vdc to 18 Vdc.
- Is the MC14521BDR2G Pb-free and RoHS compliant?
Yes, the device is Pb-free and RoHS compliant.
- What is the operating temperature range for the MC14521BDR2G?
The operating temperature range is from -55°C to 125°C.
- Can the MC14521BDR2G drive external loads?
Yes, the RC and crystal oscillator outputs are capable of driving external loads.
- What is the purpose of the VDD′ and VSS′ pins?
The VDD′ and VSS′ pins are brought out on the crystal oscillator inverter to allow the connection of external resistors for low-power operation.
- Is the MC14521BDR2G suitable for automotive applications?
Yes, it is AEC-Q100 qualified and PPAP capable, making it suitable for automotive and other applications requiring unique site and control change requirements.
- How does the reset function affect the RC oscillator?
The reset function disables the RC oscillator for low standby power drain.
- What is the significance of the test mode in the MC14521BDR2G?
The test mode is designed to reduce test time.
