Overview
The SN74HCS32DR, produced by Texas Instruments, is a quadruple 2-input OR gate integrated circuit with Schmitt-trigger inputs. This device is part of the HCMOS (High-Speed CMOS) family and is designed to operate over a wide voltage range from 2 V to 6 V. It contains four independent 2-input OR gates, each performing the Boolean function Y = A + B in positive logic. The Schmitt-trigger inputs make the device highly tolerant of slow or noisy input signals, making it ideal for applications where signal integrity is a concern.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 2 | - | 6 | V |
| Operating Temperature (TA) | -40 | - | 125 | °C |
| Input Clamp Current (IIK) | - | - | ±20 | mA |
| Output Clamp Current (IOK) | - | - | ±20 | mA |
| Propagation Delay (tpd) at VCC = 2 V | 15 | 36 | - | ns |
| Propagation Delay (tpd) at VCC = 4.5 V | 7 | 13 | - | ns |
| Propagation Delay (tpd) at VCC = 6 V | 6 | 12 | - | ns |
| Transition Time (tt) at VCC = 2 V | 9 | 16 | - | ns |
| Transition Time (tt) at VCC = 4.5 V | 5 | 9 | - | ns |
| Transition Time (tt) at VCC = 6 V | 4 | 8 | - | ns |
| Output Drive Current at VCC = 6 V | - | - | ±7.8 | mA |
Key Features
- Wide Operating Voltage Range: The device operates from 2 V to 6 V, making it versatile for various applications.
- Schmitt-Trigger Inputs: Allows for slow or noisy input signals, enhancing noise rejection and tolerance to signal degradation.
- Low Power Consumption: Typical supply current (ICC) of 100 nA and input leakage current of ±100 nA.
- High Output Drive Capability: ±7.8 mA output drive at 6 V.
- Extended Ambient Temperature Range: Operates from -40°C to +125°C.
- Balanced CMOS Push-Pull Outputs: Ensures the device can sink and source similar currents, providing balanced output drive.
- Clamp Diode Structure: Inputs and outputs have both positive and negative clamping diodes for protection.
Applications
- Error Signal Monitoring: Can be used to monitor error signals with fewer inputs.
- Enable Signal Combination: Combines active-low enable signals into a single active-high enable signal.
- Fan Driver Control: Ideal for controlling fan drivers where only one input signal needs to be HIGH to enable the fan.
- Distributed Temperature Sensing: Suitable for systems with temperature sensors spread throughout, where signal integrity over long traces is crucial.
Q & A
- What is the operating voltage range of the SN74HCS32DR?
The SN74HCS32DR operates from 2 V to 6 V.
- What type of inputs does the SN74HCS32DR have?
The device has Schmitt-trigger inputs.
- What is the typical supply current (ICC) of the SN74HCS32DR?
The typical supply current (ICC) is 100 nA.
- What is the output drive capability of the SN74HCS32DR at 6 V?
The output drive capability is ±7.8 mA at 6 V.
- What is the operating temperature range of the SN74HCS32DR?
The device operates from -40°C to +125°C.
- How do Schmitt-trigger inputs benefit the SN74HCS32DR?
Schmitt-trigger inputs allow for slow or noisy input signals and enhance noise rejection.
- Can the SN74HCS32DR drive capacitive loads?
Yes, it can drive loads with a total capacitance less than or equal to 50 pF.
- How should unused inputs be handled?
Unused inputs should be terminated to either VCC or ground, either directly or with pull-up or pull-down resistors.
- What is the recommended layout practice for the SN74HCS32DR?
A decoupling capacitor should be placed close to the device, and short, appropriately sized traces should be used to minimize capacitive load.
- Can outputs be left floating?
Yes, unused outputs can be left floating but should not be connected directly to VCC or ground.
