The part you mentioned, "SN74LVC8T245QPWRQ1," belongs to Texas Instruments (TI). It's a part number for an 8-bit bidirectional voltage-level translator, typically used for signal level shifting between different voltage domains.
For the pinout and function specifications, I will proceed with a detailed breakdown of the pin functions, the packaging type, and provide a comprehensive FAQ in a structured manner.
Pinout and Functions
The SN74LVC8T245QPWRQ1 comes in a TSSOP (Thin Shrink Small Outline Package) with a 20-pin configuration.
Below is a table with all the pins and their detailed function descriptions.
Pin Number Pin Name Function Description Pin Type 1 A1 Data input (A side) Input 2 A2 Data input (A side) Input 3 A3 Data input (A side) Input 4 A4 Data input (A side) Input 5 A5 Data input (A side) Input 6 A6 Data input (A side) Input 7 A7 Data input (A side) Input 8 A8 Data input (A side) Input 9 GND Ground connection Ground 10 B1 Data output (B side) Output 11 B2 Data output (B side) Output 12 B3 Data output (B side) Output 13 B4 Data output (B side) Output 14 B5 Data output (B side) Output 15 B6 Data output (B side) Output 16 B7 Data output (B side) Output 17 B8 Data output (B side) Output 18 DIR Direction control Control 19 VCC Positive Power supply Power 20 OE Output enable ControlPackaging Information
Package Type: TSSOP (Thin Shrink Small Outline Package) Pin Count: 20 pins Package Dimensions: Typically 5.0 mm x 4.4 mm x 1.0 mm (for TSSOP)Explanation of Pin Functions:
A1 - A8 (Pins 1-8): These are the data input pins for the A side, where the signals from the lower voltage domain are received. These pins allow bidirectional signal translation to the B side.
B1 - B8 (Pins 10-17): These are the corresponding data output pins for the B side, where the translated signals are output to the higher voltage domain. The output is determined by the logic level of the A side inputs and the direction control.
DIR (Pin 18): This pin controls the direction of data flow between the A and B sides. When the direction is set to A → B, data flows from the A side to the B side. When set to B → A, data flows in the reverse direction.
OE (Pin 20): This pin is used to enable or disable the output buffers. When OE is low, the outputs (B1-B8) are enabled, and when OE is high, the outputs are disabled (high impedance state).
VCC (Pin 19): This pin provides the power supply to the device. The voltage level for the B side should match the VCC voltage.
GND (Pin 9): The ground connection for the device.
20 Common FAQs for SN74LVC8T245QPWRQ1
Q1: What is the main function of the SN74LVC8T245QPWRQ1? A1: The SN74LVC8T245QPWRQ1 is an 8-bit bidirectional voltage-level translator designed for shifting voltage levels between different voltage domains.
Q2: How many pins does the SN74LVC8T245QPWRQ1 have? A2: The SN74LVC8T245QPWRQ1 has a 20-pin configuration.
Q3: What type of package does the SN74LVC8T245QPWRQ1 come in? A3: It comes in a TSSOP (Thin Shrink Small Outline Package).
Q4: How is the direction of signal flow controlled? A4: The direction of signal flow is controlled by the DIR pin. When the DIR pin is low, the data flows from A to B, and when it is high, the data flows from B to A.
Q5: What is the function of the OE pin? A5: The OE (Output Enable) pin controls whether the output pins (B1 to B8) are enabled or disabled. When OE is low, the outputs are enabled; when high, they are disabled.
Q6: Can the SN74LVC8T245QPWRQ1 be used for voltage levels between 3.3V and 5V? A6: Yes, it is designed to translate between voltage levels of 3.3V, 5V, and other compatible logic levels.
Q7: Is this IC capable of bidirectional communication? A7: Yes, the SN74LVC8T245QPWRQ1 supports bidirectional communication between two different voltage domains.
Q8: What is the maximum operating frequency for the SN74LVC8T245QPWRQ1? A8: The maximum operating frequency is typically 120 MHz, but this can vary depending on voltage levels and load conditions.
Q9: Does the SN74LVC8T245QPWRQ1 require an external clock signal? A9: No, it does not require an external clock signal as it operates based on the direction control (DIR) and the input signals.
Q10: What are the supply voltage requirements for the SN74LVC8T245QPWRQ1? A10: The VCC pin should be connected to a positive power supply within the range of 1.65V to 5.5V, depending on the application requirements.
Q11: What happens when the OE pin is high? A11: When OE is high, the output pins are in a high-impedance state, effectively disabling the outputs.
Q12: Can the SN74LVC8T245QPWRQ1 be used for 1.8V and 2.5V logic level translations? A12: Yes, the device supports translating between a variety of logic voltage levels, including 1.8V, 2.5V, 3.3V, and 5V.
Q13: What is the maximum current drive capability for the outputs? A13: The output drive capability is typically 6 mA for both high and low states, but this can depend on the load and voltage conditions.
Q14: Can the SN74LVC8T245QPWRQ1 be used in industrial applications? A14: Yes, the "Q1" designation indicates that this part is automotive and industrial grade, with extended temperature range and other reliability features.
Q15: How does the SN74LVC8T245QPWRQ1 handle different voltage levels for A and B sides? A15: The device automatically adjusts and shifts the voltage levels between the A and B sides based on the logic levels input to the A-side pins.
Q16: What is the typical power consumption for the SN74LVC8T245QPWRQ1? A16: The typical supply current is in the range of 4 mA to 8 mA depending on operating conditions.
Q17: Is the SN74LVC8T245QPWRQ1 compatible with 5V logic systems? A17: Yes, the device is compatible with 5V logic on the B side and lower voltage logic on the A side.
Q18: What happens if the DIR pin is not properly configured? A18: If the DIR pin is left floating or improperly configured, the direction of data flow might not function as expected.
Q19: How does the device handle signal integrity? A19: The SN74LVC8T245QPWRQ1 is designed with low impedance outputs and optimized to minimize signal distortion.
Q20: Can this part be used for level shifting in high-speed digital communication? A20: Yes, it can be used for high-speed communication with proper PCB layout and voltage compatibility.
This detailed response includes an explanation of pin functions, packaging, and a FAQ list in an easy-to-understand format. Let me know if you need further clarification or specific information!