The 74LS240 belongs to 74XXYY IC series. The 74LS240 is a series of octal buffers and line drivers designed specifically to improve both the performance and density of three-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters. The IC has a wide range of working voltage, a wide range of working conditions, and directly interfaces with CMOS, NMOS, and TTL. The output of the IC always comes in TTL which makes it easy to work with other TTL devices and microcontrollers. The IC 74LS240 is smaller in size and it has a much faster speed which makes it reliable in every kind of device.
What are Buffers/Line Drivers?
Buffers and line drivers are integrated circuit devices that can isolate the input circuit from the output circuit. This decreases the load seen by the input circuit and enables signals to be sent on PCB or cables over longer distances with higher fan-out. It is normal to find buffers in clock trees on PCBs where low noise & high-speed logic signals are important. Line drivers are a special type of buffer that includes the ability to drive a transmission line or cable that may be quite long. Best example of this would be an eSATA Redriver.
74LS240 Pinout
74LS240 Pin Configuration
| Pin No | Pin Name | Description |
|---|---|---|
| 1 | 1G’ | Channel 1 output enable |
| 2 | 1A1 | Channel 1, A side 1 |
| 3 | 2Y4 | Channel 2, Y side 4 |
| 4 | 1A2 | Channel 1, A side 2 |
| 5 | 2Y3 | Channel 2, Y side 3 |
| 6 | 1A3 | Channel 1, A side 3 |
| 7 | 2Y2 | Channel 2, Y side 2 |
| 8 | 1A4 | Channel 1, A side 4 |
| 9 | 2Y1 | Channel 2, Y side 1 |
| 10 | GND | Ground Pin |
| 11 | 2A1 | Channel 2, A side 1 |
| 12 | 1Y4 | Channel 1, Y side 4 |
| 13 | 2A2 | Channel 2, A side 2 |
| 14 | 1Y3 | Channel 1, Y side 3 |
| 15 | 2A3 | Channel 2, A side 3 |
| 16 | 1Y2 | Channel 1, Y side 2 |
| 17 | 2A4 | Channel 2, A side 4 |
| 18 | 1Y1 | Channel 1, Y side 1 |
| 19 | 2G’ | Channel 2 output enable |
| 20 | Vcc | Chip Supply Voltage |
74LS240 Features & Specifications
- Technology Family: LS
- VCC (Min): 4.75V
- VCC (Max): 5.25V
- Channels (#): 8
- 3-State Outputs Drive Bus Lines or Buffer Memory Address Registers
- PNP Inputs Reduce DC Loading
- Hysteresis at Inputs Improves Noise Margins
- IOL (Max): 24mA
- IOH (Max): -15mA
- ICC (Max): 44uA
- Input type: Bipolar
- Output type: 3-State
- Speed: (TPD 10-50ns)
- Input clamp diode
- Data rate: 70Mbps
- Rating: Catalog
Applications
- Servers
- LED Displays
- Network Switches
- Telecom Infrastructure
- Motor Drivers
- I/O Expanders
You can download this datasheet for 74LS240 Octal Buffer/Line Driver IC With 3-State Outputs from the link given below:
See Also: 74LS02 Quad Two Input NOR Gate – Datasheet | 74LS116 Dual 4-Bit Latch IC With Clear – Datasheet | 74LS121 Monostable Multivibrator IC With Schmitt Trigger Inputs
