Overview
The SN74HC27DRE4 is a triple 3-input NOR gate integrated circuit produced by Texas Instruments. This device is part of the 74HC series, known for its high-speed CMOS logic and wide operating voltage range. Each gate within the IC performs the Boolean function Y = A + B + C in positive logic, making it versatile for various digital logic applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 2 | 5 | 6 | V |
| High-Level Input Voltage (VIH) | 1.5 (VCC = 2 V) | 3.15 (VCC = 4.5 V) | 4.2 (VCC = 6 V) | V |
| Low-Level Input Voltage (VIL) | 0.5 (VCC = 2 V) | 1.35 (VCC = 4.5 V) | 1.8 (VCC = 6 V) | V |
| Operating Free-Air Temperature (TA) | -40 | - | 85 | °C |
| Propagation Delay (tpd) | 35 (VCC = 2 V) | 10 (VCC = 4.5 V) | 9 (VCC = 6 V) | ns |
| Transition Time (tt) | 27 (VCC = 2 V) | 7 (VCC = 4.5 V) | 6 (VCC = 6 V) | ns |
| Package Type | SOIC (14 pins) | - | - | - |
| Body Size (Nom) | 8.70 mm × 3.90 mm | - | - | - |
Key Features
- Buffered Inputs: Ensures stable input signals.
- Wide Operating Voltage Range: From 2 V to 6 V, making it versatile for different applications.
- Wide Operating Temperature Range: From -40°C to +85°C, suitable for various environmental conditions.
- Significant Power Reduction: Compared to LSTTL logic ICs, reducing power consumption.
- Supports Fanout up to 10 LSTTL Loads: High fanout capability for connecting multiple loads.
- Balanced CMOS Push-Pull Outputs: Allows the device to sink and source similar currents, ensuring balanced output.
Applications
- Alarm / Tamper Detect Circuit: Can be used in security systems to detect tampering or alarm conditions.
- S-R Latch: Useful in constructing Set-Reset latches for memory and flip-flop circuits.
- Digital Logic Circuits: Suitable for various digital logic applications requiring NOR gate functionality.
Q & A
- What is the Boolean function performed by each gate in the SN74HC27DRE4?
Each gate performs the Boolean function Y = A + B + C in positive logic.
- What is the operating voltage range of the SN74HC27DRE4?
The operating voltage range is from 2 V to 6 V.
- What is the operating temperature range of the SN74HC27DRE4?
The operating temperature range is from -40°C to +85°C.
- What type of package does the SN74HC27DRE4 come in?
The SN74HC27DRE4 comes in a SOIC (14-pin) package.
- What is the body size of the SOIC package for the SN74HC27DRE4?
The body size is 8.70 mm × 3.90 mm.
- What is the propagation delay of the SN74HC27DRE4 at different supply voltages?
The propagation delay is 35 ns at VCC = 2 V, 10 ns at VCC = 4.5 V, and 9 ns at VCC = 6 V.
- What are some common applications of the SN74HC27DRE4?
Common applications include alarm/tamper detect circuits, S-R latches, and various digital logic circuits.
- How many loads can the SN74HC27DRE4 support?
The device supports fanout up to 10 LSTTL loads.
- What is the significance of balanced CMOS push-pull outputs in the SN74HC27DRE4?
The balanced CMOS push-pull outputs allow the device to sink and source similar currents, ensuring balanced output and preventing damage due to over-current.
- What precautions should be taken when using the SN74HC27DRE4?
Ensure the supply voltage is within the specified range, and do not exceed the maximum total current through GND or VCC. Also, use bypass capacitors to prevent power disturbances.
- Is the SN74HC27DRE4 RoHS compliant?
Yes, the SN74HC27DRE4 is RoHS compliant and free of Sb/Br.
