Overview
The SN74LVT245BDBR, produced by Texas Instruments, is a 3.3-V ABT (Advanced BiCMOS Technology) octal bus transceiver with 3-state outputs. This device is designed for low-voltage (3.3-V) VCC operation but also supports mixed-mode signal operation, allowing it to interface with 5-V systems. It is particularly useful for asynchronous communication between data buses, enabling data transmission from the A bus to the B bus or vice versa, controlled by the direction-control (DIR) input. The output-enable (OE) input allows the device to be disabled, effectively isolating the buses.
Key Specifications
| Parameter | Min | Typical | Max | Unit |
|---|---|---|---|---|
| Supply Voltage Range (VCC) | -0.5 | - | 4.6 | V |
| Input Voltage Range (VI) | -0.5 | - | 7 | V |
| Output Voltage Range (VO) in High-Impedance or Power-Off State | -0.5 | - | 7 | V |
| Operating Temperature Range | -40 | - | 85 | °C |
| Propagation Delay Time (tPLH/tPHL) | - | 5.1 | - | ns |
| Output High Voltage (VOH) at VCC = 3.3 V, IOH = -8 mA | 2.4 | - | - | V |
| Output Low Voltage (VOL) at VCC = 3.3 V, IOL = 100 μA | 0.2 | - | - | V |
Key Features
- Supports mixed-mode signal operation (5-V input and output voltages with 3.3-V VCC)
- Unregulated battery operation down to 2.7 V
- Typical output ground bounce (VOLP) < 0.8 V at VCC = 3.3 V, TA = 25°C
- 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 SN74LVT245BDBR is suitable for various applications requiring asynchronous communication between data buses, such as in computer systems, telecommunications equipment, and other digital systems where data needs to be transmitted between different voltage domains. It is particularly useful in mixed-voltage environments where compatibility between 3.3-V and 5-V systems is necessary.
Q & A
- What is the primary function of the SN74LVT245BDBR? The primary function is to act as an octal bus transceiver, enabling data transmission between two data buses (A and B) with 3-state outputs.
- What is the operating voltage range for the SN74LVT245BDBR? The device operates with a supply voltage range of -0.5 V to 4.6 V.
- Can the SN74LVT245BDBR operate in mixed-voltage environments? Yes, it supports mixed-mode signal operation with 5-V input and output voltages while operating at a 3.3-V VCC.
- What is the purpose of the DIR input? The DIR input controls the direction of data transmission between the A and B buses.
- How does the OE input function? The OE input can be used to disable the device, placing the outputs in a high-impedance state and effectively isolating the buses.
- What are the ESD protection capabilities of the SN74LVT245BDBR? The device exceeds JESD 22 standards with 2000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model protection.
- What is the typical propagation delay time for the SN74LVT245BDBR? The typical propagation delay time (tPLH/tPHL) is 5.1 ns.
- Is the SN74LVT245BDBR suitable for hot-insertion applications? Yes, it is fully specified for hot-insertion applications using Ioff and power-up 3-state.
- What are the package options available for the SN74LVT245BDBR? The device is available in SSOP (DB), SOIC (DW), SOP (NS), TSSOP (PW), VQFN (RGY), and BGA (ZQN) packages.
- What is the operating temperature range for the SN74LVT245BDBR? The device operates over a temperature range of -40°C to 85°C.
