Overview
The CD4028BM is a CMOS BCD-to-Decimal or Binary-to-Octal decoder manufactured by Texas Instruments. This integrated circuit is designed to perform code conversion, specifically decoding BCD (Binary Coded Decimal) to decimal or binary to octal. The device is part of the 4000B series and is known for its medium-speed operation and high decoded output drive capability. Although the CD4028BM is currently obsolete and no longer in production, it remains relevant for existing designs and educational purposes.
Key Specifications
| Specification | Value |
|---|---|
| Package Type | 16-SOIC (0.154", 3.90mm Width) |
| Pins | 16 |
| Operating Temperature Range | -55°C to 125°C |
| Voltage Supply Range | 3 V to 18 V |
| Output Current (High/Low) | 6.8 mA / 6.8 mA |
| Propagation Delay (tPHL, tPLH) | 80 ns (typ.) @ VDD = 10 V |
| Noise Margin | 1 V at VDD = 5 V, 2 V at VDD = 10 V, 2.5 V at VDD = 15 V |
| Maximum Input Current | 1 µA at 18 V over full package-temperature range; 100 nA at 18 V and 25°C |
Key Features
- BCD-to-decimal decoding or binary-to-octal decoding
- High decoded output drive capability
- Positive logic inputs and outputs; decoded outputs go high on selection
- Medium-speed operation
- Standardized, symmetrical output characteristics
- 100% tested for quiescent current at 20 V
- Meets all requirements of JEDEC Tentative Standard No. 13B for B Series CMOS Devices
Applications
- Code conversion
- Indicator-tube decoder
- Address decoding and memory selection control
Q & A
- What is the primary function of the CD4028BM? The CD4028BM is a BCD-to-decimal or binary-to-octal decoder.
- What package types are available for the CD4028BM? The CD4028BM is available in 16-lead SOIC, DIP, and other package types.
- What is the operating temperature range of the CD4028BM? The operating temperature range is -55°C to 125°C.
- What is the voltage supply range for the CD4028BM? The voltage supply range is 3 V to 18 V.
- What is the propagation delay of the CD4028BM? The propagation delay (tPHL, tPLH) is typically 80 ns at VDD = 10 V.
- Is the CD4028BM still in production? No, the CD4028BM is obsolete and no longer in production.
- What are some common applications of the CD4028BM? Common applications include code conversion, indicator-tube decoding, and address decoding-memory selection control.
- What is the maximum input current for the CD4028BM? The maximum input current is 1 µA at 18 V over the full package-temperature range; 100 nA at 18 V and 25°C.
- Does the CD4028BM meet any specific industry standards? Yes, it meets all requirements of JEDEC Tentative Standard No. 13B for B Series CMOS Devices.
- What is the noise margin of the CD4028BM? The noise margin is 1 V at VDD = 5 V, 2 V at VDD = 10 V, and 2.5 V at VDD = 15 V.
