74LS243 DIP Quad Bus Transceiver with Non-Inverting 3-State Outputs
The 74LS243 is a high speed TTL integrated circuit designed for 4-bit bidirectional communication between data buses. This device features four independent non-inverting transceivers with 3-state outputs, allowing for efficient data transfer in both directions while providing the ability to isolate the buses when necessary. The direction of data flow and the high-impedance state are managed by two separate output enable inputs.
By manipulating the enable inputs, the device can be configured to transmit data from bus A to bus B, from bus B to bus A, or to isolate both buses entirely. This makes the 74LS243 an essential component for microprocessor-based systems, memory interfaces, and any application where multiple peripherals must share a common data path. The low power Schottky technology ensures high-speed data throughput with minimized power consumption and high noise immunity.
KEY FEATURES
- 4-bit bidirectional data communication in a single package
- Non-inverting 3-state outputs for direct bus interfacing
- Dual enable inputs for precise direction and isolation control
- High-current drive capability for effectively managing bus loads
- Low power Schottky design for high frequency signal processing
- Standard 14 pin dual in line package
SPECIFICATIONS
- Supply Voltage 4.75V to 5.25V
- Operating Temperature 0 to 70 Celsius
- Logic Type TTL Low Power Schottky
- Typical Propagation Delay 12ns
- High Level Output Current -15mA
- Low Level Output Current 24mA
- Input Voltage High 2.0V Minimum
INTERFACES
- A1 to A4 Bidirectional data port A
- B1 to B4 Bidirectional data port B
- GAB BAR Output enable A to B active low
- GBA Output enable B to A active high
- VCC Positive supply voltage
- GND Ground reference
