Description
GD74LS244 Octal 3-STATE
Buffer/Line Driver/Line Receiver
IC
The GD74LS244 is a monolithic integrated circuit from the LS-TTL family, functioning as an octal buffer, line driver, and line receiver. This single IC contains eight individual buffers, organized into two groups of four, with each group controlled by a separate output enable pin. Its primary design purpose is to enhance the performance and density of digital systems by providing a robust interface between a data source and a common bus or transmission line. It acts as a signal amplifier, ensuring that a logic signal can be transmitted over longer distances or to more devices without degradation.
A key characteristic of this device is its non-inverting 3-state output. The outputs can exist in one of three states: a standard logic high, a standard logic low, or a high-impedance (Hi-Z) state. When the output is in the high-impedance state, it is effectively disconnected from the circuit, allowing multiple outputs to be connected to a shared bus line without causing electrical conflicts. This is essential for building bidirectional buses and multiplexed systems where multiple devices need to share the same data path.
The inputs of the
GD74LS244
are designed with P-N-P transistors, which significantly reduce the DC loading on the driving circuitry. Furthermore, the inputs incorporate hysteresis, which improves noise margins by requiring a defined voltage change to switch states, making the device more resistant to signal noise and fluctuations. Combined with its ability to drive relatively heavy loads, these features make it a reliable solution for driving memory address registers, clock lines, and other bus-oriented applications in noisy environments.
Features:
Non-inverting 3-State outputs for bus-oriented applications.
Separate output enable inputs for each group of four buffers.
P-N-P inputs to reduce DC loading on the source driver.
Input hysteresis improves noise immunity.
Designed to drive terminated transmission lines.
Pin Description:
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
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
Positive Supply
Specifications:
Parameter
Condition
Min
Typ
Max
Unit
Supply Voltage (Vcc):
4.75
5
5.25
V
High-Level Input Voltage:
2
V
Low-Level Input Voltage:
0.8
V
Propagation Delay:
12
18
ns
Output Current (Low):
24
mA
Operating Temperature:
0
70
°C
Footprint Diagram:
Applications:
Memory Address Driving.
Clock Driver.
Bus Transceiver.
System Bus Buffering.
General Purpose Line Driving.
Package Contents:
1x
GD74LS244 Octal 3-STATE Buffer/Line Driver/Line Receiver IC
Datasheet
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