Overview
The SN74HC240NSR is an octal buffer and line driver produced by Texas Instruments. This component is designed to enhance the performance and density of 3-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters. The device is organized as two 4-bit buffers/drivers with separate output-enable (OE) inputs. When the OE input is low, the device passes inverted data from the A inputs to the Y outputs. When the OE input is high, the outputs are in the high-impedance state.
Key Specifications
| Parameter | Min | Nom | Max |
|---|---|---|---|
| Supply Voltage (VCC) | 2 V | 5 V | 6 V |
| High-Level Input Voltage (VIH) | 1.5 V (at VCC = 2 V) | 3.15 V (at VCC = 4.5 V) | 4.2 V (at VCC = 6 V) |
| Low-Level Input Voltage (VIL) | 0.5 V (at VCC = 2 V) | 1.35 V (at VCC = 4.5 V) | 1.8 V (at VCC = 6 V) |
| Input Voltage (VI) | 0 V | VCC | |
| Output Voltage (VO) | 0 V | VCC | |
| Operating Free-Air Temperature | -40°C | 85°C | |
| Propagation Delay (tpd) A to Y | 9 ns (typical at VCC = 6 V) | 25 ns (max at VCC = 6 V) | |
| Output Drive Current | ±6 mA (at VCC = 5 V) | ||
| Input Current | 1 µA (max) |
Key Features
- Wide operating voltage range of 2 V to 6 V
- High-current outputs drive up to 15 LSTTL loads
- Low power consumption, 80 µA max ICC
- Typical propagation delay (tpd) of 9 ns
- ±6 mA output drive at 5 V
- Low input current of 1 µA max
- 3-state outputs drive bus lines or buffer memory address registers
Applications
The SN74HC240NSR is suitable for various applications, including:
- 3-state memory address drivers
- Clock drivers
- Bus-oriented receivers and transmitters
- General-purpose buffering and line driving in digital systems
Q & A
- What is the operating voltage range of the SN74HC240NSR? The operating voltage range is from 2 V to 6 V.
- How many bits does each buffer/driver in the SN74HC240NSR handle? Each buffer/driver handles 4 bits.
- What is the function of the output-enable (OE) input? When OE is low, the device passes inverted 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 (tpd) at VCC = 6 V? The maximum propagation delay is 25 ns.
- How much current can the outputs drive at 5 V? The outputs can drive up to ±6 mA at 5 V.
- What is the maximum input current? The maximum input current is 1 µA.
- What are the typical applications of the SN74HC240NSR? Typical applications include 3-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters.
- What is the operating temperature range of the SN74HC240NSR? The operating temperature range is from -40°C to 85°C.
- What package types are available for the SN74HC240NSR? The component is available in SOP (NS), SOIC (DW), SSOP (DB), and TSSOP (PW) packages.
- Is the SN74HC240NSR RoHS compliant? Yes, the SN74HC240NSR is RoHS compliant.
