Overview
The CD4511BE is a BCD-to-7-segment latch decoder driver produced by Texas Instruments. It is constructed with CMOS logic and NPN bipolar transistor output devices on a single monolithic structure. This device combines the low quiescent power dissipation and high noise immunity of CMOS with the capability of NPN bipolar output transistors to source up to 25 mA, allowing it to directly drive LEDs and other displays. The CD4511BE features inputs for lamp test, blanking, and latch enable, enabling various display control functions and multiplexing capabilities when used with external circuitry.
Key Specifications
| Parameter | Value | Description |
|---|---|---|
| Package Type | DIP, SO, TSSOP | Available in 16-lead dual-in-line plastic, small-outline, and thin shrink small-outline packages |
| Pin Count | 16 | Total number of pins |
| Supply Voltage Range | 3 V to 18 V | Operating voltage range |
| Operating Temperature Range | -55°C to 125°C | Temperature range for operation |
| Output Current Capability | Up to 25 mA | Maximum current sourcing capability of the output transistors |
| Input Current | 1 µA at 18 V, 100 nA at 18 V and 25°C | Maximum input current over the full package temperature range and at 25°C |
| Propagation Delay | 420 ns (nominal supply), 1320 ns (maximum) | Propagation delay times for the device |
| Package Dimensions | Height: 5.08 mm, Length: 19.3 mm, Width: 6.35 mm | Physical dimensions of the package |
Key Features
- High output sourcing capability up to 25 mA
- Supply voltage range from 3 V to 18 V
- Input latches for BCD code storage
- Lamp Test (LT), Blanking (BL), and Latch Enable (LE) inputs for display control
- 100% tested for quiescent current at 20 V
- Low quiescent power dissipation and high noise immunity due to CMOS logic
- ROHS3 compliant and lead-free
Applications
- Driving common-cathode LED displays
- Multiplexing with common-cathode LED displays
- Driving incandescent displays
- Driving low-voltage fluorescent displays
Q & A
- What is the CD4511BE used for?
The CD4511BE is used as a BCD-to-7-segment latch decoder driver, primarily for driving and controlling 7-segment displays.
- What is the output current capability of the CD4511BE?
The CD4511BE can source up to 25 mA from its output transistors.
- What is the operating temperature range of the CD4511BE?
The operating temperature range is from -55°C to 125°C.
- What are the different package types available for the CD4511BE?
The CD4511BE is available in 16-lead dual-in-line plastic, small-outline, and thin shrink small-outline packages.
- How do you use the Lamp Test (LT) and Blanking (BL) inputs?
The LT pin turns on all segments when set LOW for testing, and the BL pin turns off all segments when set LOW for blanking or intensity modulation.
- What is the purpose of the Latch Enable (LE) input?
The LE input stores the current BCD code when set HIGH, allowing the display to show the last data even if the BCD inputs change.
- Is the CD4511BE ROHS compliant?
- What is the propagation delay of the CD4511BE?
The propagation delay is 420 ns at nominal supply voltage and up to 1320 ns under maximum conditions.
- Can the CD4511BE drive incandescent displays?
- How do you connect the power supply to the CD4511BE?
