SNJ54LS628FK

Programmable Timers And Oscillators Overview

The SNJ54LS628FK is a voltage-controlled oscillator (VCO) from the SN54LS62x series, manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an extended temperature range of -55°C to 125°C. The device is housed in a 20-pin Leadless Ceramic Chip Carrier (LCCC) package designated as FK. This component functions as a precision analog-to-frequency converter, utilizing external timing components to generate output frequencies proportional to an input control voltage.

Programmable Timers And Oscillators Feature Summary

• Voltage-Controlled Oscillator with frequency proportional to input voltage
• Extended military-grade temperature range: -55°C to 125°C
• 20-pin LCCC (FK) ceramic package
• Supply voltage range: 4.5 V to 5.5 V

Programmable Timers And Oscillators Applications

• Frequency modulation circuits
• Analog-to-digital conversion systems
• Precision pulse-width modulation generators
• Voltage-to-frequency converters for instrumentation

Programmable Timers And Oscillators Procurement Notes

Verify the specific ordering suffix against the latest TI Package Option Addendum to confirm the exact package type and material specifications. Confirm RoHS status and lead finish details, as military variants may differ from standard catalog parts. Ensure the supplier provides traceability documentation consistent with QML or military procurement requirements.

Programmable Timers And Oscillators Selection Notes

Select the SNJ54LS628FK when a high-precision VCO is required for harsh environments due to its -55°C to 125°C operating range. Compare pin counts and package styles with other members of the SN54LS62x family, such as the SNJ54LS629, to ensure functional compatibility with the system design. Verify that the external timing capacitor and resistor values align with the desired frequency range specified in the datasheet.

Programmable Timers And Oscillators Part Context

The SNJ54LS628FK belongs to the SN54LS624 through SN54LS629 family of voltage-controlled oscillators. These devices are designed for applications requiring accurate frequency generation based on analog input signals. The 'SNJ' prefix indicates a ceramic DIP or LCCC package suitable for military and aerospace applications, while the 'FK' suffix specifically denotes the 20-pin LCCC form factor.

Programmable Timers And Oscillators Replacement Considerations

Direct replacements include other variants within the SN54LS62x family, such as the SNJ54LS629FK, provided the pinout and functional differences are accounted for. Catalog versions like the SN74LS628 are available but operate within a limited commercial temperature range (0°C to 70°C). Verify package compatibility when substituting between LCCC and DIP formats.