Overview
The SNJ54HC244J is a military-grade octal buffer and line driver produced by Texas Instruments. This device is part of the SNx4HC244 series and is designed to enhance the performance and density of 3-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters. It operates within a wide voltage range of 2 V to 6 V and is organized as two 4-bit buffers and drivers with separate output-enable (OE) inputs. When the OE input is low, the device passes noninverted data from the A inputs to the Y outputs, and when the OE input is high, the outputs are in the high-impedance state.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage Range (VCC) | -0.5 | 7 | V | |
| Operating Free-Air Temperature | -55 | 125 | °C | |
| High-Level Input Voltage (VIH) | 1.5 (VCC=2V), 3.15 (VCC=4.5V), 4.2 (VCC=6V) | V | ||
| Low-Level Input Voltage (VIL) | 0.5 (VCC=2V), 1.35 (VCC=4.5V), 1.8 (VCC=6V) | V | ||
| Output Voltage (VO) | 0 | VCC | V | |
| Continuous Output Current (IO) | ±35 | mA | ||
| Input Transition Rise and Fall Time | 1000 ns/V (VCC=2V), 500 ns/V (VCC=4.5V), 400 ns/V (VCC=6V) | ns/V | ||
| Propagation Delay Time (tpd) | 170 ns (VCC=2V), 34 ns (VCC=4.5V), 29 ns (VCC=6V) | ns |
Key Features
- Wide operating voltage range of 2 V to 6 V
- High-current outputs drive up to 15 LSTTL loads
- 3-state outputs drive bus lines or buffer memory and address registers
- Low power consumption: ICC, 80-µA (maximum)
- Typical propagation delay time (tpd) = 11 ns
- ±6-mA output drive at 5 V
- Low input current of 1 µA (maximum)
Applications
- Servers
- LED Displays
- Network Switches
- Telecom Infrastructure
- Motor Drivers
- I/O Expanders
Q & A
- What is the operating voltage range of the SNJ54HC244J? The operating voltage range is 2 V to 6 V.
- How many bits does the SNJ54HC244J buffer and driver handle? It handles two 4-bit buffers and drivers.
- What is the function of the output-enable (OE) input? When OE is low, the device passes noninverted data from the A inputs to the Y outputs. When OE is high, the outputs are in the high-impedance state.
- What is the maximum propagation delay time at 5 V? The typical propagation delay time (tpd) is 29 ns at 5 V.
- What is the maximum output current? The device can drive up to ±35 mA continuously.
- What are the typical applications of the SNJ54HC244J? Typical applications include servers, LED displays, network switches, telecom infrastructure, motor drivers, and I/O expanders.
- What is the maximum junction temperature for the SNJ54HC244J? The maximum junction temperature is 150°C.
- How does the device handle power-up or power-down to ensure the high-impedance state? To ensure the high-impedance state during power up or power down, the OE input should be tied to VCC through a pullup resistor.
- What is the ESD rating for the SNJ54HC244J? The ESD rating is ±2000 V for the human-body model (HBM) and ±1000 V for the charged-device model (CDM).
- What is the package type for the SNJ54HC244J? The SNJ54HC244J comes in a CDIP (J) package with 20 pins.
