The part number "SN74LVCH16T245DGGR" belongs to Texas Instruments, which is a well-known global semiconductor company.
1. Package and Pin Functions Overview
This part is a 16-bit bidirectional voltage-level translator with a TSSOP-48 (Thin Shrink Small Outline Package) package type. Below is a detailed explanation of the pins and their functions, followed by a FAQ section.
Pinout and Functions:Here is the detailed description of each pin function for the SN74LVCH16T245DGGR:
Pin Number Pin Name Pin Type Pin Function Description 1 A1 Input/Output Bidirectional data input/output (Group A) 2 A2 Input/Output Bidirectional data input/output (Group A) 3 A3 Input/Output Bidirectional data input/output (Group A) 4 A4 Input/Output Bidirectional data input/output (Group A) 5 A5 Input/Output Bidirectional data input/output (Group A) 6 A6 Input/Output Bidirectional data input/output (Group A) 7 A7 Input/Output Bidirectional data input/output (Group A) 8 A8 Input/Output Bidirectional data input/output (Group A) 9 A9 Input/Output Bidirectional data input/output (Group A) 10 A10 Input/Output Bidirectional data input/output (Group A) 11 A11 Input/Output Bidirectional data input/output (Group A) 12 A12 Input/Output Bidirectional data input/output (Group A) 13 A13 Input/Output Bidirectional data input/output (Group A) 14 A14 Input/Output Bidirectional data input/output (Group A) 15 A15 Input/Output Bidirectional data input/output (Group A) 16 GND Power Ground pin (connected to ground) 17 B1 Input/Output Bidirectional data input/output (Group B) 18 B2 Input/Output Bidirectional data input/output (Group B) 19 B3 Input/Output Bidirectional data input/output (Group B) 20 B4 Input/Output Bidirectional data input/output (Group B) 21 B5 Input/Output Bidirectional data input/output (Group B) 22 B6 Input/Output Bidirectional data input/output (Group B) 23 B7 Input/Output Bidirectional data input/output (Group B) 24 B8 Input/Output Bidirectional data input/output (Group B) 25 B9 Input/Output Bidirectional data input/output (Group B) 26 B10 Input/Output Bidirectional data input/output (Group B) 27 B11 Input/Output Bidirectional data input/output (Group B) 28 B12 Input/Output Bidirectional data input/output (Group B) 29 B13 Input/Output Bidirectional data input/output (Group B) 30 B14 Input/Output Bidirectional data input/output (Group B) 31 B15 Input/Output Bidirectional data input/output (Group B) 32 VCC Power Positive voltage supply pin 33 DIR Control Direction control pin (for determining the direction of data flow) 34 OE Control Output enable control pin (controls whether the outputs are active or in high impedance) 35 VCC Power Positive voltage supply pin 36 GND Power Ground pin (connected to ground) 37 NC No Connect No internal connection (unused pin) 38 NC No Connect No internal connection (unused pin) 39 NC No Connect No internal connection (unused pin) 40 NC No Connect No internal connection (unused pin) 41 NC No Connect No internal connection (unused pin) 42 NC No Connect No internal connection (unused pin) 43 NC No Connect No internal connection (unused pin) 44 NC No Connect No internal connection (unused pin) 45 NC No Connect No internal connection (unused pin) 46 NC No Connect No internal connection (unused pin) 47 NC No Connect No internal connection (unused pin) 48 NC No Connect No internal connection (unused pin) General Description:This part, SN74LVCH16T245DGGR, is a 16-bit bi-directional level shifter designed to be used in systems that require shifting voltage levels between different logic families (e.g., between 3.3V logic and 5V logic). It uses a voltage translation mechanism to enable communication between systems operating at different voltages.
2. FAQ (Frequently Asked Questions)
Q1: What is the SN74LVCH16T245DGGR and what does it do?A1: The SN74LVCH16T245DGGR is a 16-bit bidirectional voltage-level translator. It is used to convert logic levels between different voltage systems, such as from 3.3V to 5V or vice versa.
Q2: How many pins does the SN74LVCH16T245DGGR have?A2: The SN74LVCH16T245DGGR has a total of 48 pins.
Q3: What is the purpose of the OE pin on the SN74LVCH16T245DGGR?A3: The OE pin is the Output Enable pin, which controls whether the device's outputs are active or in high impedance. When OE is low, the outputs are enabled. When OE is high, the outputs are in high impedance.
Q4: What is the function of the DIR pin?A4: The DIR pin controls the direction of data flow. When DIR is high, data flows from Group A (pins A1-A16) to Group B (pins B1-B16). When DIR is low, data flows from Group B to Group A.
Q5: What does the VCC pin represent in the SN74LVCH16T245DGGR?A5: The VCC pin is the power supply input pin. It provides the positive voltage needed to operate the IC.
Q6: How do I connect the GND pins in the SN74LVCH16T245DGGR?A6: Both GND pins should be connected to the ground (0V) of the power supply system.
Q7: How do I use the A and B pins on the SN74LVCH16T245DGGR?A7: The A and B pins are used for bidirectional data transfer. These pins are the main interface for data transmission between systems of different voltage levels.
Q8: Can I use all the NC pins?A8: No, the NC pins are not connected internally and should be left unconnected in your circuit design.
Q9: What is the recommended supply voltage for the SN74LVCH16T245DGGR?A9: The recommended supply voltage range for the SN74LVCH16T245DGGR is typically 2.3V to 5.5V.
Q10: Can the SN74LVCH16T245DGGR be used in 5V logic systems?A10: Yes, the SN74LVCH16T245DGGR can be used in 5V logic systems, as it supports both 3.3V and 5V voltage levels.
Q11: What is the maximum output drive current for the SN74LVCH16T245DGGR?A11: The maximum output drive current for this device is typically 8 mA.
Q12: How do I handle the DIR pin during operation?A12: The DIR pin must be controlled carefully to set the correct direction for data flow. Ensure the OE pin is low for the data to be active before toggling the DIR pin.
Q13: Is the SN74LVCH16T245DGGR a level-shifting chip or a buffer?A13: The SN74LVCH16T245DGGR is primarily a level-shifter IC designed for bidirectional voltage-level translation, rather than just a buffer.
Q14: What is the maximum data rate for the SN74LVCH16T245DGGR?A14: The maximum data rate is typically 25 MHz, though actual performance can depend on factors like supply voltage and load capacitance.
Q15: Is there any specific PCB layout recommendation for the SN74LVCH16T245DGGR?A15: It's recommended to minimize the trace lengths between the VCC and GND pins to ensure stable operation, and to avoid excessive capacitance on the signal lines for higher-speed operation.
Q16: How is the voltage translation done in the SN74LVCH16T245DGGR?A16: The voltage translation is done using internal circuitry that ensures proper logic levels are presented on the output based on the voltage levels applied at the inputs.
Q17: Can the OE pin be tied to ground?A17: No, the OE pin should not be tied to ground unless you want to permanently disable the outputs. It must be controlled to enable or disable the outputs as required.
Q18: Can I drive more than one SN74LVCH16T245DGGR in a circuit?A18: Yes, you can use multiple SN74LVCH16T245DGGR devices in parallel as long as each device is correctly powered and the data lines are not overloaded.
Q19: How should I select the voltage for VCC?A19: The VCC voltage should be selected based on the logic level of the system you're connecting to. It should be compatible with the voltage levels of your other ICs in the circuit.
Q20: Are there any limitations on the number of devices I can use?A20: The main limitation will be the total drive current available and the capacitance on the data lines. Ensure that you follow the manufacturer's guidelines on load and power supply limitations.
This concludes a detailed description of the SN74LVCH16T245DGGR part, including its pinout functions and FAQ section.
