Overview
The CD74HC4514EN, produced by Texas Instruments, is a high-speed silicon gate device that integrates a 4-bit strobed latch and a 4-to-16 line decoder/demultiplexer. This component is part of the HC (High-Speed CMOS) logic family, known for its balanced propagation delay, significant power reduction, and high noise immunity. The device operates over a wide temperature range of -55°C to 125°C, making it suitable for various environmental conditions.
Key Specifications
| Parameter | Symbol | Test Conditions | Units | Min | Typ | Max |
|---|---|---|---|---|---|---|
| DC Supply Voltage | VCC | - | V | -0.5 | - | 7 |
| High Level Input Voltage | VIH | VCC = 2V | V | 1.5 | - | - |
| High Level Input Voltage | VIH | VCC = 4.5V | V | 3.15 | - | - |
| High Level Input Voltage | VIH | VCC = 6V | V | 4.2 | - | - |
| Low Level Input Voltage | VIL | VCC = 2V | V | - | - | 0.5 |
| Low Level Input Voltage | VIL | VCC = 4.5V | V | - | - | 1.35 |
| Low Level Input Voltage | VIL | VCC = 6V | V | - | - | 1.8 |
| Propagation Delay (Select to Outputs) | tPHL, tPLH | CL = 50pF, VCC = 4.5V | ns | 55 | 69 | 83 |
| Propagation Delay (LE to Outputs) | tPHL, tPLH | CL = 50pF, VCC = 4.5V | ns | 45 | 56 | 68 |
| Output Transition Time | tTHL, tTLH | CL = 50pF, VCC = 4.5V | ns | 15 | 19 | 22 |
| Input Capacitance | CIN | CL = 50pF | pF | 10 | - | - |
Key Features
- Multifunction Capability: The device functions as both a binary to 1-of-16 decoder and a 1-to-16 line demultiplexer.
- Wide Operating Temperature Range: Operates from -55°C to 125°C.
- High-Speed Operation: Balanced propagation delay and transition times.
- Significant Power Reduction: Compared to LSTTL logic ICs.
- High Noise Immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5V.
- Latch Enable (LE): When LE is high, the output follows changes in the inputs; when LE is low, the output is isolated from changes in the input.
- Enable Input (E): A low on E enables the selected output; a high on E inhibits selection of any output.
- Drive Capability: Can drive 10 LSTTL loads.
Applications
- Decoder and Demultiplexer Circuits: Ideal for applications requiring decoding or demultiplexing functions.
- Sequential Logic Circuits: Useful in edge-triggered sequential logic circuits due to its latch functionality.
- High-Speed Digital Systems: Suitable for high-speed digital systems requiring low power consumption and high noise immunity.
- Industrial and Military Environments: Operates over a wide temperature range, making it suitable for harsh environmental conditions.
Q & A
- What is the primary function of the CD74HC4514EN?
The primary function is to act as a 4-bit strobed latch and a 4-to-16 line decoder/demultiplexer.
- What is the operating temperature range of the CD74HC4514EN?
The device operates from -55°C to 125°C.
- How does the Latch Enable (LE) input affect the output?
When LE is high, the output follows changes in the inputs; when LE is low, the output is isolated from changes in the input.
- What is the role of the Enable Input (E) in the CD74HC4514EN?
A low on E enables the selected output; a high on E inhibits selection of any output.
- How many LSTTL loads can the CD74HC4514EN drive?
The device can drive 10 LSTTL loads.
- What is the typical propagation delay from select to outputs at VCC = 4.5V?
The typical propagation delay is 69 ns for CL = 50pF.
- What is the input capacitance of the CD74HC4514EN?
The input capacitance is 10 pF.
- Is the CD74HC4514EN suitable for high-speed digital systems?
Yes, it is suitable due to its balanced propagation delay and transition times, and significant power reduction compared to LSTTL logic ICs.
- What are the package options available for the CD74HC4514EN?
The device is available in PDIP (Plastic Dual In-Line Package) and SOIC (Small Outline Integrated Circuit) packages.
- Is the CD74HC4514EN RoHS compliant?
Yes, the device is RoHS compliant.
