CA3161E Technical Summary

Overview

The CA3161E is a monolithic integrated circuit designed to perform Binary-Coded Decimal (BCD) to seven-segment decoding, featuring constant current segment drivers. This IC is particularly useful when paired with the CA3162E A/D Converter, forming a complete digital readout system with minimal external components. The CA3161E is engineered to deliver reliable performance in digital display applications, offering TTL-compatible input logic levels and eliminating the need for external current-limiting resistors.

Features

• TTL-Compatible Input Logic Levels: Ensures seamless integration with TTL logic circuits.
• 25mA (Typical) Constant Current Segment Outputs: Provides stable and consistent current for driving seven-segment displays.
• Eliminates Need for Output Current Limiting Resistors: Reduces component count and simplifies circuit design.
• Pin-Compatible with Other Industry Standard Decoders: Facilitates easy replacement and upgrades in existing designs.
• Low Standby Power Dissipation (18mW Typical): Enhances energy efficiency in standby or idle modes.

Applications

The CA3161E is versatile and finds use in a variety of digital display applications, including but not limited to:

• Digital Panel Meters: Provides accurate and clear numeric displays for measurement instruments.
• Industrial Control Systems: Used in control panels for displaying process variables and status information.
• Consumer Electronics: Integrated into devices such as digital clocks, calculators, and home appliances.
• Automotive Displays: Suitable for dashboard instrumentation and other in-vehicle display systems.
• Test and Measurement Equipment: Ensures precise readouts in laboratory and field testing devices.

Electrical Characteristics

The following table summarizes the key electrical characteristics of the CA3161E under typical operating conditions (unless otherwise specified):

Absolute Maximum Ratings

• Supply Voltage (V_CC): 7V
• Input Voltage (V_IN): -0.3V to V_CC + 0.3V
• Output Current (I_OUT): 25mA per segment (continuous)
• Operating Temperature Range (T_A): 0°C to +70°C
• Storage Temperature Range (T_STG): -65°C to +150°C

Recommended Operating Conditions

• Supply Voltage (V_CC): 4.75V to 5.25V
• Input High Voltage (V_IH): 2.0V (min)
• Input Low Voltage (V_IL): 0.8V (max)
• Operating Temperature (T_A): 0°C to +70°C

DC Electrical Characteristics

• Input High Current (I_IH): 40µA (max) at V_IN = 2.4V
• Input Low Current (I_IL): -1.6mA (max) at V_IN = 0.4V
• Output High Voltage (V_OH): 2.4V (min) at I_OUT = -400µA
• Output Low Voltage (V_OL): 0.4V (max) at I_OUT = 16mA
• Supply Current (I_CC): 3.6mA (max) at V_CC = 5.25V

Package Information

The CA3161E is available in a standard 16-pin dual in-line package (DIP), which is widely used in through-hole PCB applications. The package dimensions and pin configuration are detailed below:

16-Pin DIP Package Dimensions

• Package Type: PDIP-16
• Length: 19.3mm (max)
• Width: 6.35mm (max)
• Height: 4.57mm (max)
• Lead Pitch: 2.54mm

Pin Configuration

• Pin 1: BCD Input A (LSB)
• Pin 2: BCD Input B
• Pin 3: BCD Input C
• Pin 4: BCD Input D (MSB)
• Pin 5: Lamp Test (LT)
• Pin 6: Blanking Input (BI)
• Pin 7: Ground (GND)
• Pin 8: Segment Output g
• Pin 9: Segment Output f
• Pin 10: Segment Output e
• Pin 11: Segment Output d
• Pin 12: Segment Output c
• Pin 13: Segment Output b
• Pin 14: Segment Output a
• Pin 15: Supply Voltage (V_CC)
• Pin 16: Ripple Blanking Output (RBO)

Functional Description

The CA3161E decodes a 4-bit BCD input (pins 1-4) into the corresponding seven-segment output (pins 8-14). The lamp test (LT) and blanking input (BI) pins provide additional control over the display. When the LT pin is activated, all segments are illuminated to test the display. The BI pin can be used to blank the display, while the ripple blanking output (RBO) allows cascading multiple displays for multi-digit applications.

Conclusion

The CA3161E is a robust and efficient solution for BCD to seven-segment decoding, offering high performance with minimal external components. Its constant current drivers, TTL compatibility, and low power dissipation make it ideal for a wide range of digital display applications. Whether used in industrial, automotive, or consumer electronics, the CA3161E delivers reliable and precise results.