SNJ54BCT2244J

Overview

The SNJ54BCT2244J is an octal buffer and line/MOS driver featuring three-state outputs, manufactured using state-of-the-art BiCMOS technology. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating free-air temperature from -55°C to 125°C. The device contains two independent buffers with four bits each, utilizing symmetrical active-low output-enable inputs. Outputs include equivalent 33-Ω series resistors to reduce overshoot and undershoot without external components.

Feature Summary

• State-of-the-art BiCMOS design significantly reduces quiescent current consumption
• Integrated 33-Ω series resistors in output ports eliminate the need for external resistors
• Three-state outputs capable of driving bus lines or buffering memory address registers
• High fan-out and improved fan-in characteristics enhance signal integrity

Applications

• Memory address drivers
• Clock drivers
• Bus-oriented receivers and transmitters

Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature rating. Confirm RoHS compliance status as military-grade variants may differ from standard catalog specifications. Ensure pull-up resistor requirements on OE pins are addressed during circuit design to maintain high-impedance states during power transitions.

Selection Notes

Select this component when designing systems requiring octal buffering with integrated termination resistors. The military temperature range makes it suitable for harsh environments where standard commercial grade devices would fail. Consider the BiCMOS architecture for applications demanding lower power consumption compared to traditional CMOS alternatives while maintaining robust drive capabilities.

Part Context

This part belongs to the SN54BCT2244 family, which includes both commercial (SN74) and military (SN54) versions. The 'J' suffix specifically denotes the 20-pin Ceramic Dual In-Line Package (CDIP). It shares functional similarities with other BCT series drivers but offers distinct packaging and environmental ratings tailored for specialized industrial or defense applications.

Replacement Considerations

SNJ54BCT2244W

FAQ

Why are internal series resistors included in the outputs?

The outputs feature equivalent 33-Ω series resistors designed to reduce signal overshoot and undershoot, thereby eliminating the requirement for external termination resistors.

How should the Output Enable (OE) pin be handled during power-up?

To ensure the high-impedance state during power-up or power-down, the OE pin should be tied to VCC through a pull-up resistor sized according to the driver's current-sinking capability.