Overview
The SN74LVC244A is an octal bus buffer designed by Texas Instruments for asynchronous communication between data buses. It operates within a voltage range of 1.65 V to 3.6 V, making it versatile for various applications. The device is organized as two 4-bit buffers/line drivers with separate output-enable (OE) inputs, allowing data to be passed from the A inputs to the Y outputs when OE is low. The outputs are in the high-impedance state when OE is high.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | -0.5 | 6.5 | V | |
| Input Voltage (VI) | -0.5 | 6.5 | V | |
| Output Voltage (VO) | -0.5 | VCC + 0.5 | V | |
| Ambient Temperature (TA) | -40 | 125 | °C | |
| Propagation Delay Time (tpd) | 5.9 | 14.4 | ns | |
| Output Ground Bounce (VOLP) | < 0.8 | V | ||
| Output Undershoot (VOHV) | 2 | V | ||
| ESD Protection | 2000 V (HBM), 1000 V (CDM) | V |
Key Features
- Operates from 1.65 V to 3.6 V
- Inputs accept voltages up to 5.5 V
- Specified from –40°C to +85°C and –40°C to +125°C
- Maximum propagation delay time of 5.9 ns at 3.3 V
- Typical output ground bounce < 0.8 V at VCC = 3.3 V, TA = 25°C
- Typical output undershoot > 2 V at VCC = 3.3 V, TA = 25°C
- Supports mixed-mode signal operation on all ports (5-V input or output voltage with 3.3-V VCC)
- Supports live insertion, partial-power-down mode, and back-drive protection
- Can be used as a down translator to translate inputs from a maximum of 5.5 V down to the VCC level
- Available in ultra-small logic QFN package (0.5 mm maximum height)
- Latch-up performance exceeds 250 mA per JESD 17
- ESD protection exceeds JESD 22 (2000-V HBM, 1000-V CDM)
Applications
- Servers
- LED Displays
- Network Switches
- Telecom Infrastructure
- Motor Drivers
- I/O Expanders
Q & A
- What is the operating voltage range of the SN74LVC244A?
The SN74LVC244A operates from 1.65 V to 3.6 V.
- What is the maximum input voltage the SN74LVC244A can accept?
The inputs can accept voltages up to 5.5 V.
- What is the propagation delay time of the SN74LVC244A at 3.3 V?
The maximum propagation delay time is 5.9 ns at 3.3 V.
- What is the typical output ground bounce of the SN74LVC244A?
The typical output ground bounce is less than 0.8 V at VCC = 3.3 V, TA = 25°C.
- Does the SN74LVC244A support mixed-mode signal operation?
Yes, it supports mixed-mode signal operation on all ports.
- What kind of ESD protection does the SN74LVC244A have?
The SN74LVC244A has ESD protection exceeding JESD 22 (2000-V HBM, 1000-V CDM).
- In what packages is the SN74LVC244A available?
The device is available in various packages including PDIP, SO, SSOP, TVSOP, SOIC, VQFN, BGA, TSSOP, and X1QFN.
- What are some common applications of the SN74LVC244A?
Common applications include servers, LED displays, network switches, telecom infrastructure, motor drivers, and I/O expanders.
- How does the output-enable (OE) input function in the SN74LVC244A?
The outputs are in the high-impedance state when OE is high and pass data from the A inputs to the Y outputs when OE is low.
- Does the SN74LVC244A support live insertion and partial-power-down mode?
Yes, it supports live insertion, partial-power-down mode, and back-drive protection.
