Overview
The CD74HC4514 is a high-speed silicon gate device produced by Texas Instruments. It combines a 4-bit strobed latch and a 4-to-16 line decoder/demultiplexer. This integrated circuit is designed to operate over a wide temperature range of -55°C to 125°C and supports a supply voltage range from 2V to 6V. The device is particularly useful in applications requiring decoding and demultiplexing functions with the added capability of input latches.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage (VCC) | 2.0 | 6.0 | V | ||
| Operating Temperature Range | -55 | 125 | °C | ||
| High-Level Input Voltage (VIH) | VCC = 4.5V | 3.15 | 4.5 | V | |
| Low-Level Input Voltage (VIL) | VCC = 4.5V | -2.1 | 1.35 | V | |
| Propagation Delay (tPHL, tPLH) | CL = 50pF, Select to Outputs | 55 | 69 | 83 | ns |
| Input Leakage Current (II) | VCC = 4.5V | 0 | 0 | nA | |
| Output Voltage (VOH) | IO = -20 μA, VCC = 4.5V | 4.4 | 4.5 | V | |
| Output Voltage (VOL) | IO = 20 μA, VCC = 4.5V | 0.1 | 0.1 | V |
Key Features
- Multifunction capability: Binary to 1-of-16 decoder and 1-to-16 line demultiplexer
- Wide operating temperature range: -55°C to 125°C
- Wide supply voltage range: 2V to 6V
- High noise immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5V
- Significant power reduction compared to LSTTL logic ICs
- Ability to drive 10 LSTTL loads
- Latch enable input (LE) and enable input (E) for flexible operation
- ESD protection: HBM exceeds 2000 V, CDM exceeds 1000 V
Applications
- Digital multiplexing and demultiplexing
- Decoder applications where a 4-bit binary input needs to be decoded into one of 16 possible outputs
- Demultiplexing applications where data needs to be routed to one of 16 possible outputs based on a 4-bit address
- Cascaded decoder/demultiplexer configurations using the enable input (E) as a chip select
Q & A
- What is the operating temperature range of the CD74HC4514?
The operating temperature range is -55°C to 125°C.
- What is the supply voltage range for the CD74HC4514?
The supply voltage range is from 2V to 6V.
- How many LSTTL loads can the CD74HC4514 drive?
The device can drive up to 10 LSTTL loads.
- What is the function of the Latch Enable (LE) input?
The LE input determines whether the outputs follow changes in the inputs or remain stable at their previous state.
- How does the Enable (E) input function in the CD74HC4514?
The E input enables or inhibits the selection of any output. When E is low, the selected output is enabled; when E is high, all outputs are inhibited.
- What are the ESD protection levels for the CD74HC4514?
The device has ESD protection exceeding 2000 V for HBM and 1000 V for CDM.
- Can the CD74HC4514 be used as a demultiplexer?
Yes, the device can be used as a demultiplexer by using the E input as the data input and the select inputs (A0-A3) as addresses.
- How many outputs does the CD74HC4514 have?
The device has 16 outputs (Q0 to Q15).
- What is the propagation delay for the CD74HC4514?
The propagation delay (tPHL, tPLH) for select to outputs is typically around 69 ns at CL = 50pF and VCC = 4.5V.
- Is the CD74HC4514 compatible with TTL logic levels?
No, the CD74HC4514 is designed for CMOS logic levels. However, the 74HCT4514 version is compatible with TTL logic levels.
