SN74BCT373DW

Overview

The SN74BCT373DW is an octal transparent D-type latch with 3-state outputs manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range of 0°C to 70°C. The device utilizes state-of-the-art BiCMOS design to reduce quiescent current. Key electrical characteristics include a low-level output current capability of up to 64 mA and a high-level output current of -15 mA at 5 V. Propagation delays from data inputs (D) to outputs (Q) are typically 6.7 ns for low-to-high transitions and 5.9 ns for high-to-low transitions.

Feature Summary

• Transparent D-type latching mechanism where outputs follow inputs while the latch-enable signal is active
• Three-state outputs capable of driving highly capacitive or low-impedance loads without interface components
• Buffered output-enable input allows placement of outputs in normal logic states or high-impedance condition

Applications

• Implementing buffer registers
• I/O port implementations
• Bidirectional bus drivers
• Working registers

Procurement Notes

Verify the specific ordering suffix 'DW' corresponds to the SOIC package type and tube packing configuration as listed in the official ordering information. Confirm that the required operating temperature range aligns with the commercial grade specifications (0°C to 70°C). Ensure compatibility with the 4.5 V to 5.5 V supply voltage requirements before procurement.

Selection Notes

Select this component when designing systems requiring octal data storage with bus-compatible three-state outputs. The BiCMOS technology offers lower power consumption compared to standard bipolar designs. Consider the 64 mA low-level drive strength for applications involving heavy capacitive loading on shared bus lines.

Part Context

This part belongs to the SN74BCT series, which features BiCMOS technology designed to combine the speed of bipolar circuits with the low power consumption of CMOS. The SN74BCT373 specifically provides eight independent latches with tri-state control, distinguishing it from non-latching buffers or single-bit flip-flops within the broader logic IC family.

Replacement Considerations

SN74BCT373N (PDIP package)

FAQ

How does the output-enable (OE) input affect internal latch operations?

The OE input only controls the external output state. It does not affect the internal operations of the latches; old data can be retained or new data entered while outputs are in the high-impedance state.

What is the recommended method to ensure high-impedance 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 pullup resistor.