The model "SN74AHC1G125DBVR" belongs to Texas Instruments. It is a single bus buffer from the SN74AHC series, based on AHC (Advanced High-Speed CMOS) technology. Let's break down your request into the necessary details.
Pin Function Specifications and Circuit Principle
Model Overview:
Manufacturer: Texas Instruments Series: SN74AHC Type: Single Bus Buffer (Tri-state) Package Type: DBVR (SOT-23-5) The "DBVR" package denotes a 5-pin small-outline transistor (SOT) package, and the total number of pins for this specific model is 5. Pinout and Functionality (All 5 Pins) Pin Number Pin Name Pin Function Description 1 1A Input This is the input pin where the signal is fed into the buffer. It accepts logic-level input signals. 2 GND Ground This pin is connected to the system ground. All logic circuits need a ground reference. 3 OE Output Enable The output enable pin. When this pin is logic low (LOW), the output (pin 4) is enabled, and when high (HIGH), the output is in high-impedance (tri-state). 4 1Y Output This is the output pin. It delivers the buffered signal from pin 1 when the output enable (OE) pin is active. 5 Vcc Power Supply This is the power supply pin. It is connected to the positive voltage, typically +5V.Pin Function Details
1A (Input): Accepts a logic signal that will be passed through to the output pin (1Y). It can handle both high (logic "1") and low (logic "0") input values, depending on the voltage levels.
OE (Output Enable): The function of the output buffer is controlled by this pin. If OE is set to logic high (HIGH), the buffer is disabled, and the output pin (1Y) is placed in high-impedance (tri-state) mode, effectively isolating the output from the circuit. If OE is set to logic low (LOW), the buffer is active, and the signal from 1A is passed to 1Y.
1Y (Output): The buffered signal from the input pin (1A) is delivered through this pin when the output is enabled. This pin is the primary output of the IC.
GND (Ground): This is the reference ground pin, which completes the circuit by providing a low-voltage return path for current.
Vcc (Power Supply): This pin provides the necessary power supply voltage to the IC. Typically, this voltage is 5V for the AHC logic family.
Packaging Details and Pinout Information
Package Type: DBVR (SOT-23-5) 5 Pins: The device is housed in a 5-pin small-outline package with each pin having a specific function. Size: Compact, suitable for space-constrained applications.FAQ Section
1. What is the primary function of the SN74AHC1G125DBVR? The SN74AHC1G125DBVR is a single bus buffer with tri-state output, used to buffer and isolate digital signals in circuits.
2. What happens if the OE pin is set to HIGH? When the OE (output enable) pin is HIGH, the output (pin 4) enters a high-impedance state, effectively disconnecting the output from the circuit.
3. Can the input signal be directly connected to 1A? Yes, the 1A pin can directly receive logic signals without needing an external buffer or conditioning circuit.
4. What logic levels are supported on the input (1A)? The input pin 1A accepts standard TTL/CMOS logic levels, typically 0V for logic LOW and 3.3V or 5V for logic HIGH.
5. How does the buffer affect signal quality? The buffer isolates the input from the output, providing clean, uninterrupted signal transmission and preventing loading effects.
6. What is the voltage range for the Vcc pin? The Vcc pin typically operates within the 2V to 5.5V range, with 5V being the most common operating voltage.
7. Can the SN74AHC1G125DBVR be used for both logic high and low levels? Yes, the buffer handles both logic high (HIGH) and logic low (LOW) signals, maintaining the integrity of the signal through the 1A and 1Y pins.
8. Is there a maximum current rating for the pins? Yes, the current rating is typically around 25mA per pin, which is typical for CMOS logic devices.
9. Can the SN74AHC1G125DBVR be used in high-speed circuits? Yes, it is designed for high-speed operation with a typical propagation delay of around 8ns at 5V.
10. What is the function of the GND pin? The GND pin is the reference point for the circuit, providing the ground connection for the device's operation.
11. How do you connect multiple SN74AHC1G125DBVR ICs together? Multiple devices can be used in parallel, with each having its own 1A (input) and 1Y (output) pins connected to the appropriate signal lines.
12. Can I use the SN74AHC1G125DBVR in a 3.3V system? Yes, the SN74AHC1G125DBVR works with a 3.3V supply, and its logic level thresholds are compatible with 3.3V logic systems.
13. How do I disable the output on the 1Y pin? To disable the output, set the OE pin to HIGH. This will place the output in a high-impedance state.
14. Can the SN74AHC1G125DBVR handle negative voltages? No, the device should not be subjected to negative voltages as this can damage the IC. It is designed for use with positive voltage levels.
15. What are the typical applications for the SN74AHC1G125DBVR? Typical applications include digital signal buffering, data isolation, and bus drivers where signal integrity is crucial.
16. What is the maximum allowable temperature range? The device typically operates within a -40°C to 125°C temperature range.
17. How do I calculate the propagation delay for the buffer? The propagation delay is the time it takes for the input signal to propagate through to the output, which for this device is typically 8ns at 5V.
18. Can the device be used in automotive circuits? Yes, as long as the device operates within the specified temperature range, it can be used in automotive applications that require low-power, high-speed signal buffering.
19. Can the output of the SN74AHC1G125DBVR be connected to other digital devices directly? Yes, the 1Y output can be connected directly to other digital devices, provided the voltage levels are compatible.
20. What kind of protection does the IC offer against electrostatic discharge (ESD)? The device has internal ESD protection diodes to safeguard against typical electrostatic discharge events.
This detailed overview of the SN74AHC1G125DBVR should give you a comprehensive understanding of the model, its pin functions, and common FAQs.
