Overview
The CD74HC4511, produced by Texas Instruments, is a BCD-to-7 segment latch/decoder/driver integrated circuit. This device is designed to convert Binary Coded Decimal (BCD) inputs into the corresponding 7-segment display outputs. It features input latches for storing BCD codes, an active-low blanking input, a lamp-test input, and a latch-enable input. The CD74HC4511 operates within a voltage range of 2 V to 6 V, making it versatile for various applications.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| VCC (Supply Voltage) | V | 2 | - | 6 |
| VIH (High-level input voltage) | V | - | - | 2 |
| VIL (Low-level input voltage) | V | 0.8 | - | - |
| IOH (High level output voltage) | V | 3.98 | - | - |
| IOL (Low level output voltage) | V | 0.1 | - | - |
| ICC (Supply current) | μA | 8 | - | 160 |
| Ci (Input Capacitance) | pF | 10 | - | - |
| tW (Pulse duration, LE low) | ns | 14 | - | 20 |
| tsu (Setup time, BCD inputs before LE↑) | ns | 10 | - | 15 |
| th (Hold time, BCD inputs before LE↑) | ns | 3 | - | - |
| tpd (Propagation delay time) | ns | 51 | - | 77 |
Key Features
- Operates over a wide voltage range of 2 V to 6 V.
- High-output sourcing capability: up to 10 mA at 6 V and 7.5 mA at 4.5 V.
- Input latches for storing BCD codes.
- Lamp test and blanking capability.
- Balanced propagation delays and transition times.
- Significant power reduction compared to LSTTL logic ICs.
- High noise immunity: NIL or NIH = 30% of VCC at VCC = 5 V for 'HC4511).
- Direct LSTTL input logic compatibility and CMOS input compatibility for CD74HCT4511).
Applications
- Display drivers for 7-segment displays in various electronic devices such as calculators, clocks, and other digital displays).
- Industrial control systems requiring BCD to 7-segment conversion).
- Automotive and aerospace applications where robust and reliable display drivers are needed).
- Medical devices and equipment requiring precise display control).
Q & A
- What is the voltage range for the CD74HC4511? The CD74HC4511 operates within a voltage range of 2 V to 6 V).
- What is the maximum output current sourcing capability of the CD74HC4511? The device can source up to 10 mA at 6 V and 7.5 mA at 4.5 V).
- Does the CD74HC4511 have input latches? Yes, it has input latches for storing BCD codes).
- What are the key features of the CD74HC4511 in terms of noise immunity? The 'HC4511 has high noise immunity with NIL or NIH = 30% of VCC at VCC = 5 V).
- Can the CD74HC4511 be used with LSTTL and CMOS logic? Yes, the CD74HCT4511 is compatible with both LSTTL and CMOS input logic).
- What is the purpose of the lamp test and blanking inputs? These inputs allow for testing the lamp and blanking the display, respectively).
- What are the typical propagation delays for the CD74HC4511? The propagation delay times range from 51 ns to 77 ns depending on the load capacitance and VCC).
- Is the CD74HC4511 suitable for high-temperature environments? Yes, it operates over a temperature range of –55°C to 125°C).
- What are the package options available for the CD74HC4511? The device is available in PDIP, SOIC, and TSSOP packages).
- Is the CD74HC4511 RoHS compliant? Yes, the device is RoHS compliant and suitable for lead-free processes).
