Presettable Binary/Decade Up/Down Counter The CD4029 is a CMOS presettable up/down counter manufactured by several companies, including Texas Instruments, ON Semiconductor, and NXP Semiconductors.
### **Key Specifications:**
- **Logic Family:** CMOS
- **Supply Voltage Range:** 3V to 18V
- **Operating Temperature Range:** -55°C to +125°C (military grade), -40°C to +85°C (industrial grade)
- **Counting Modes:** Binary or BCD (selectable)
- **Count Direction:** Up or Down (selectable)
- **Clock Input:** Positive-edge triggered
- **Preset Capability:** Parallel load for preset values
- **Output Type:** Standard CMOS (buffered)
- **Package Options:** DIP (Dual In-line Package), SOIC (Surface Mount)
### **Pin Configuration (16-pin DIP/SOIC):**
1. **Preset Enable (PE)** – Active high
2. **Clock (CLK)** – Positive-edge triggered
3. **Up/Down (U/D)** – High for up count, Low for down count
4. **Binary/BCD (B/D)** – High for binary, Low for BCD
5. **Carry-In (CI)** – Active low
6. **Q1** – LSB output
7. **Q2**
8. **VSS (Ground)**
9. **Q3**
10. **Q4** – MSB output
11. **Carry-Out (CO)** – Active low
12. **Preset Data Input (D4)** – MSB
13. **Preset Data Input (D3)**
14. **Preset Data Input (D2)**
15. **Preset Data Input (D1)** – LSB
16. **VDD (Positive Supply)**
### **Electrical Characteristics (Typical @ 5V):**
- **Maximum Clock Frequency:** ~5 MHz
- **Power Dissipation:** Low (µW range in static conditions)
- **Input Capacitance:** ~5 pF
The CD4029 is commonly used in frequency division, event counting, and digital control applications.
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