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 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.
- Pb-Free Packages are Available
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Data Sheets (1)
Package Drawings (1)
| Document Title | Document ID/Size | Revision |
|---|
| SOIC 16 LEAD | 751B-05 (38.2kB) | K |
Order Information
| Product | Status | Compliance | Package | MSL* | Container | Budgetary Price/Unit |
|---|
| MC14521BDG | Active | Pb-free
Halide free | SOIC-16 | 751B-05 | 1 | Tube | 48 | $0.4 |
| MC14521BDR2G | Active | Pb-free
Halide free | SOIC-16 | 751B-05 | 1 | Tape and Reel | 2500 | $0.4 |
| NLV14521BDG | Active | AEC Qualified
PPAP Capable
Pb-free
Halide free | SOIC-16 | 751B-05 | 1 | Tube | 48 | $0.44 |
| NLV14521BDR2G | Active | AEC Qualified
PPAP Capable
Pb-free
Halide free | SOIC-16 | 751B-05 | 1 | Tape and Reel | 2500 | $0.44 |
Specifications
| Product | Type | VCC Min (V) | VCC Max (V) | tpd Max (ns) | PD Max (W) | IO Max (mA) |
|---|
| MC14521BDG | Divider | 3 | 18 | 4500 | 0.5 | 2.25 |
| MC14521BDR2G | Divider | 3 | 18 | 4500 | 0.5 | 2.25 |
| NLV14521BDG | Divider | 3 | 18 | 4500 | 0.5 | 2.25 |
| NLV14521BDR2G | Divider | 3 | 18 | 4500 | 0.5 | 2.25 |
