4511
#CD4511BM
#CD4511BC
#BCD-to-seven segment
#decoder
#latch
#driver
#CMOS
#display control
#digital voltmeter
#clock display
CD4511BM/CD4511BC BCD-to-Seven Segment Latch/Decoder/Driver
Overview
The CD4511BM/CD4511BC is a monolithic integrated circuit designed to convert Binary-Coded Decimal (BCD) input into a seven-segment display output. It combines a 4-bit storage latch, an 8421 BCD-to-seven segment decoder, and output drivers in a single package. Built using Complementary Metal-Oxide-Semiconductor (CMOS) technology with NPN bipolar output drivers, this component is optimized for low power consumption and high output drive capability. It is widely used in applications requiring numeric display control, such as counters, digital voltmeters, and clock displays.
Features
- Low Logic Circuit Power Dissipation: Designed for energy-efficient operation, making it suitable for battery-powered devices.
- High Current Sourcing Outputs (up to 25 mA): Capable of driving high-current displays such as LEDs, incandescent, and gas discharge displays.
- Latch Storage of Code: Includes a 4-bit latch to hold BCD data, ensuring stable display output even when input signals change.
- Blanking Input (BI): Allows the display to be turned off or modulated for brightness control.
- Lamp Test Provision (LT): Enables testing of all display segments by illuminating them simultaneously.
- Readout Blanking on Illegal Inputs: Automatically blanks the display for invalid BCD inputs (10-15).
- Lamp Intensity Modulation Capability: Supports pulse-width modulation (PWM) for adjustable display brightness.
- Time Share (Multiplexing) Facility: Suitable for multiplexed display applications, reducing wiring complexity.
- Equivalent to Motorola MC14511: Provides compatibility with industry-standard components.
Applications
The CD4511BM/CD4511BC is versatile and can be used in a variety of display-driven applications, including:
- Instrumentation Displays: Counters, digital voltmeters (DVMs), and panel meters.
- Computer and Calculator Displays: Numeric output for computational devices.
- Cockpit Displays: Avionics and automotive dashboard readouts.
- Clocks, Watches, and Timers: Timekeeping devices requiring seven-segment displays.
- Industrial Control Systems: Process monitoring and control interfaces.
- Consumer Electronics: Appliances with numeric displays, such as microwaves and ovens.
Electrical Characteristics
Absolute Maximum Ratings
- Supply Voltage (VDD): -0.5V to +18V
- Input Voltage (VIN): -0.5V to VDD + 0.5V
- Output Current (IOUT): 25 mA (per segment)
- Operating Temperature Range: -55°C to +125°C (Military Grade: CD4511BM), 0°C to +70°C (Commercial Grade: CD4511BC)
- Storage Temperature Range: -65°C to +150°C
Recommended Operating Conditions
- Supply Voltage (VDD): 3V to 18V
- Input High Voltage (VIH): 70% of VDD (min)
- Input Low Voltage (VIL): 30% of VDD (max)
- Output High Voltage (VOH): VDD - 0.5V (min at IOUT = -25 mA)
- Output Low Voltage (VOL): 0.4V (max at IOUT = 25 mA)
Key Performance Parameters
- Power Dissipation: 500 mW (max)
- Propagation Delay (tPD): 400 ns (typical at VDD = 10V)
- Input Capacitance: 7.5 pF (typical)
- Output Rise/Fall Time: 100 ns (typical at CL = 50 pF)
Package Information
Dual-In-Line Package (DIP)
The CD4511BM/CD4511BC is available in a 16-pin DIP configuration with the following pinout:
- Pin 1: B (BCD Input B)
- Pin 2: C (BCD Input C)
- Pin 3: Lamp Test (LT)
- Pin 4: Blanking Input (BI)
- Pin 5: Latch Enable (LE)
- Pin 6: D (BCD Input D)
- Pin 7: A (BCD Input A)
- Pin 8: VSS (Ground)
- Pin 9: Segment e (Output)
- Pin 10: Segment d (Output)
- Pin 11: Segment c (Output)
- Pin 12: Segment b (Output)
- Pin 13: Segment a (Output)
- Pin 14: Segment g (Output)
- Pin 15: Segment f (Output)
- Pin 16: VDD (Positive Supply)
Mechanical Specifications
- Package Type: 16-pin Plastic DIP (CD4511BC), 16-pin Ceramic DIP (CD4511BM)
- Package Dimensions: 19.3 mm x 6.35 mm (0.76 in x 0.25 in)
- Lead Pitch: 2.54 mm (0.1 in)
- Weight: Approximately 1.2 grams
Truth Table
The CD4511BM/CD4511BC follows a standard truth table for BCD-to-seven segment conversion. Below is a summary of its operation:
| LE (Latch Enable) | BI (Blanking Input) | LT (Lamp Test) | D C B A (BCD Input) | Output (Segments a-g) |
|---|---|---|---|---|
| 0 | 1 | 1 | 0 0 0 0 to 1 0 0 1 | Displays 0-9 |
| 1 | 1 | 1 | X X X X |
