Overview
The SN74LVC245ANS is an octal bus transceiver with 3-state outputs, designed and manufactured by Texas Instruments. This device is optimized for asynchronous communication between data buses and operates within a voltage range of 1.65 V to 3.6 V. It is particularly useful in applications where high-speed data transmission and flexible bus control are required.
The SN74LVC245ANS features a direction-control input (DIR) that determines the direction of data transmission between the A and B buses. It also includes an output enable (OE) input to control the 3-state output feature, allowing the outputs to be set to a high-impedance state when not in use.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage Range | -0.5 | 6.5 | V | |
| Input Voltage Range | -0.5 | 6.5 | V | |
| Propagation Delay Time (tpd) at 3.3 V | 6.3 | ns | ||
| Output High Voltage (VOH) at 3.3 V, IOH = -100 μA | 2.2 | V | ||
| Output Low Voltage (VOL) at 3.3 V, IOL = 100 μA | 0.4 | 0.8 | V | |
| Operating Temperature Range | -40 | 125 | °C | |
| Junction-to-Ambient Thermal Resistance (RθJA) | 59.2 | °C/W |
Key Features
- Operates from 1.65 V to 3.6 V VCC.
- Inputs accept voltages up to 5.5 V.
- Maximum propagation delay time (tpd) of 6.3 ns at 3.3 V.
- Typical output ground bounce (VOLP) < 0.8 V at VCC = 3.3 V, TA = 25°C.
- Typical output VOH undershoot (VOHV) > 2 V at VCC = 3.3 V, TA = 25°C.
- Supports partial-power-down mode operation (Ioff).
- Supports mixed-mode signal operation on all ports (5-V input/output voltage with 3.3-V VCC).
- Latch-up performance exceeds 250 mA per JESD 17.
- ESD protection exceeds JESD 22 (2000-V human-body model, 1000-V charged-device model).
Applications
- Cable modem termination systems.
- Servers.
- LED displays.
- Network switches.
- Telecom infrastructure.
- Motor drivers.
- I/O expanders.
Q & A
- What is the operating voltage range of the SN74LVC245ANS?
The SN74LVC245ANS operates from 1.65 V to 3.6 V VCC.
- What is the maximum propagation delay time at 3.3 V?
The maximum propagation delay time (tpd) at 3.3 V is 6.3 ns.
- What is the typical output ground bounce at 3.3 V and 25°C?
The typical output ground bounce (VOLP) is less than 0.8 V at VCC = 3.3 V and TA = 25°C.
- Does the SN74LVC245ANS support partial-power-down mode operation?
- What is the latch-up performance of the SN74LVC245ANS?
The latch-up performance exceeds 250 mA per JESD 17.
- What kind of ESD protection does the SN74LVC245ANS have?
The SN74LVC245ANS has ESD protection that exceeds JESD 22 (2000-V human-body model, 1000-V charged-device model).
- What are some common applications of the SN74LVC245ANS?
- How does the direction-control input (DIR) function?
The direction-control input (DIR) determines the direction of data transmission between the A and B buses. When high, the signal propagates from A to B; when low, the signal propagates from B to A.
- What is the purpose of the output enable (OE) input?
The output enable (OE) input controls the 3-state output feature, allowing the outputs to be set to a high-impedance state when not in use.
- What should be done with unused inputs of the SN74LVC245ANS?
All unused inputs of the device must be held at VCC or GND to ensure proper device operation.
