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Product Detailed Parameters
- Description：54HCT240 OCTAL BUFFERS AND LINE
- Series：54HCT
- Mfr：Texas Instruments
- Package：Bulk
- Logic Type：Buffer, Inverting
- Number of Elements：2
- Number of Bits per Element：4
- Input Type：-
- Output Type：3-State
- Current - Output High, Low：6mA, 6mA
- Voltage - Supply：4.5V ~ 5.5V
- Operating Temperature：-55°C ~ 125°C (TA)
- Mounting Type：Through Hole
- Package / Case：20-CDIP (0.300", 7.62mm)
- Supplier Device Package：20-CDIP
- Grade：-
- Qualification：-
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Overview
The SNJ54HCT240J is a military-grade octal buffer and line driver featuring three-state outputs, housed in a 20-pin ceramic dual in-line package (CDIP). It operates within a supply voltage range of 4.5V to 5.5V and supports an operating temperature range from -55°C to 125°C. The device consists of two independent 4-bit buffers with separate output-enable inputs, providing inverted data transmission. It delivers high-current outputs capable of driving up to 15 LSTTL loads, with typical propagation delays of 12 ns at 5V.
Feature Summary
- TTL-voltage compatible inputs ensure seamless integration with standard logic families
- Three-state outputs facilitate efficient bus-oriented receiver and transmitter designs
- Military-grade construction provides reliable performance across extreme environmental conditions
Applications
- Memory address drivers
- Clock drivers
- Bus-oriented receivers and transmitters
Procurement Notes
Verify the specific ordering suffix 'J' corresponds to the 20-lead ceramic CDIP package configuration. Confirm that the military rating aligns with your system's environmental requirements. Ensure proper handling precautions are observed due to the sensitivity of CMOS inputs to electrostatic discharge during installation.
Selection Notes
Select this component when designing systems requiring robust signal buffering under harsh thermal conditions. The HCT technology offers TTL compatibility while maintaining low power consumption. Consider the physical dimensions of the CDIP package for your PCB layout constraints and verify that the drive strength meets the load requirements of your connected circuitry.
Part Context
This part belongs to the SNx4HCT240 family of octal buffers and line drivers. The 'SNJ' prefix indicates a military-rated version manufactured by Texas Instruments. It shares functional similarities with commercial variants like the SN74HCT240 but differs in packaging material and extended temperature specifications suitable for defense and aerospace applications.
Replacement Considerations
SNJ54HCT240FK
FAQ
How does the output-enable input affect the device operation?
When the output-enable input is low, the device passes inverted data from the A inputs to the Y outputs. When the input is high, the outputs enter a high-impedance state.
What is the maximum supply current for this device?
The maximum supply current (ICC) is specified as 80 μA at 5.5V with no load.
