Overview
The SN74LVT245BPWR is an octal bus transceiver designed by Texas Instruments, specifically for low-voltage (3.3-V) VCC operation. This device is part of the 74LVT series and is packaged in a 20-pin TSSOP (Thin Shrink Small Outline Package). It is capable of providing a TTL interface to a 5-V system environment, making it versatile for mixed-mode signal operations.
The transceiver enables asynchronous communication between two data buses, allowing data transmission from the A bus to the B bus or vice versa, based on the logic level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device, effectively isolating the buses.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 20-TSSOP (0.173", 4.40mm Width) |
| Number of Pins | 20 |
| Operating Temperature Range | -40°C to 85°C |
| Supply Voltage Range | 2.7 V to 3.6 V |
| Output Type | Push-Pull |
| Current - Output High, Low | 32 mA, 64 mA |
| Mounting Type | Surface Mount |
| Logic Type | Transceiver, Non-Inverting |
| Number of Bits per Element | 8 |
Key Features
- Mixed-Mode Signal Operation: Supports 5-V input and output voltages with 3.3-V VCC operation.
- Unregulated Battery Operation: Operates down to 2.7 V.
- Low Output Ground Bounce: Typical VOLP (Output Ground Bounce) < 0.8 V at VCC = 3.3 V, TA = 25°C.
- Hot Insertion Support: Ioff and power-up 3-state support for hot-insertion applications.
- Latch-Up Performance: Exceeds 100 mA per JESD 78, Class II.
- ESD Protection: Exceeds JESD 22 standards (2000-V Human-Body Model, 200-V Machine Model, 1000-V Charged-Device Model).
Applications
The SN74LVT245BPWR is suitable for various applications requiring low-voltage bus transceivers, including:
- Asynchronous Communication: Between two data buses in different voltage domains.
- Mixed-Voltage Systems: Where 3.3-V and 5-V logic levels need to be interfaced.
- Hot-Swap and Hot-Insertion Applications: Where the device needs to be inserted or removed without powering down the system.
- Battery-Powered Devices: Where the device can operate down to 2.7 V.
Q & A
- What is the primary function of the SN74LVT245BPWR?
The SN74LVT245BPWR is an octal bus transceiver designed for asynchronous communication between two data buses, allowing data transmission in either direction based on the direction-control input.
- What is the operating voltage range of the SN74LVT245BPWR?
The device operates within a supply voltage range of 2.7 V to 3.6 V.
- What type of package does the SN74LVT245BPWR come in?
The device is packaged in a 20-pin TSSOP (Thin Shrink Small Outline Package).
- Does the SN74LVT245BPWR support hot-insertion applications?
- What is the typical output ground bounce for the SN74LVT245BPWR?
The typical VOLP (Output Ground Bounce) is less than 0.8 V at VCC = 3.3 V and TA = 25°C.
- What are the ESD protection levels for the SN74LVT245BPWR?
The device exceeds JESD 22 standards with 2000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model protection.
- Can the SN74LVT245BPWR operate in mixed-voltage systems?
- How does the SN74LVT245BPWR handle power-up and power-down states?
The device has power-up 3-state circuitry that places the outputs in a high-impedance state during power up and power down to prevent driver conflict.
- What is the operating temperature range for the SN74LVT245BPWR?
The device operates within a temperature range of -40°C to 85°C.
- Is the SN74LVT245BPWR RoHS compliant?
