MC6840CFN-G Programmable Timer Module | Rochester Electronics
料号： MC6840CFN-G ✗ 停产MC6840CFN-G 概述
A programmable timer module is a clock-and-timing integrated circuit used to generate, divide, count, or measure timing intervals according to externally applied control and reference signals. The MC6840 family designation identifies the product as a timer rather than an oscillator, although programmable timers are commonly paired with external clock sources, counters, and digital control logic. Because the supplied web results do not expose a verified manufacturer datasheet or detailed electrical tables, this page avoids assigning unverified clock frequencies, counter ranges, supply voltages, or timing tolerances.
The MC6840CFN-G is especially relevant to legacy industrial, control, and embedded-system designs that use the MC6840 interface and require an authorized replacement source. Its availability through Rochester Electronics and listed distributors makes it useful for repair, continuation, and lifecycle-extension programs. One distributor listing reports 6240 pieces in stock, another reports 9160 pieces, and LCSC describes the component as in stock. These inventories are commercial snapshots and can change independently.
The exact CFN package dimensions, pin count, exposed-pad configuration, operating-temperature range, and environmental ratings are not present in the supplied verified data. Engineers should therefore download the original MC6840 manufacturer documentation or request the Rochester Electronics datasheet before approving a new design. Pin assignment, voltage limits, timing-edge behavior, and interface levels must be checked against the original system rather than inferred from the orderable suffix.
Typical uses include legacy digital control systems, event-counting modules, pulse-timing circuits, and equipment where an MC6840-compatible timer is already designed into the PCB. In maintenance applications, the safest replacement strategy is to preserve the existing footprint and verify every electrical characteristic. For new designs, evaluate a currently supported timer IC when long-term availability matters, but retain the MC6840CFN-G when preserving an old control platform is more important than modernization.
This page consolidates verified distributor pricing, inventory observations, source links, sourcing guidance, and data gaps for the MC6840CFN-G. It deliberately separates confirmed marketplace facts from unverified technical assumptions, giving engineers a more reliable basis for legacy-component procurement and replacement planning.
直接替换替代料： MC6840CFN-G ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
该产品暂无直接替换替代料。
请求替代料MC6840CFN-G 规格参数
| Product Type | MC6840 programmable timer module (PTM) |
| Manufacturer | Rochester Electronics, LLC |
| Device Category | Clock/Timing - Programmable Timers and Oscillators |
| Orderable MPN | MC6840CFN-G |
| Minimum Advertised Price | $22.3619 as of 2026-10-28 |
| Alternate Advertised Price | $58.9806 |
MC6840CFN-G standard 引脚配置指南
MC6840CFN-G（standard 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： MC6840CFN-G.
请参阅 数据手册 以查看完整引脚配置。
典型应用
MC6840CFN-G 适用于 6 应用s: Legacy Industrial Control Timing, Pulse and Interval Generation, Event Counting and Frequency Division, Embedded Equipment Maintenance, Laboratory and Communication Equipment, Obsolete Equipment Continuation.
Legacy Industrial Control Timing
The MC6840CFN-G is appropriate for a legacy industrial control platform that already uses an MC6840 programmable timer interface for event timing, interval generation, or counting. Its exact fit depends on retaining the established board layout, clock architecture, and control signals. Verified distributor data confirms the part's identity as an MC6840 programmable timer module and reports commercial availability as of 2026-10-28, including 6240 pieces at one distributor and 9160 pieces at another. Before installation, engineers should compare the original MC6840 documentation for supply voltage, pin assignment, timing limits, and operating-temperature grade because those technical values were not exposed in the supplied search results.
Pulse and Interval Generation
The MC6840CFN-G can support a legacy pulse-timing subsystem when the existing equipment expects the MC6840 programmable timer behavior and associated processor interface. This application is most relevant to maintenance and continuation designs rather than unrestricted new development, because the verified material does not provide a modern timing-IC comparison table. The confirmed marketplace facts are a starting price of $22.3619 as of 2026-10-28 and multiple in-stock distributor listings. Design approval should depend on the original datasheet for edge-triggering, counter width, output timing, clock requirements, and electrical limits, none of which are stated in the provided web data.
Event Counting and Frequency Division
The MC6840CFN-G is a practical candidate for a legacy event-counting or frequency-division circuit that uses the MC6840 architecture for digital timing measurements. Its confirmed classification as a programmable timer module supports this use, while the verified distributor listings provide an active procurement route for replacement units. Compatibility must still be proven at the circuit level: input frequency, count range, reset timing, output polarity, and clock-source requirements are all missing from the supplied sources. Obtain the original MC6840 manufacturer documentation and validate those characteristics on the target equipment before treating the MC6840CFN-G as a qualified replacement.
Embedded Equipment Maintenance
The MC6840CFN-G is well suited to maintenance of embedded test, communications, or data-acquisition equipment whose original timer section was designed around an MC6840-compatible device. Using the exact ordering code reduces risk when the PCB, processor bus, and control firmware cannot be redesigned. Verified sources show the Rochester Electronics, LLC part available through several channels as of 2026-10-28, with one listing advertising a $22.3619 starting price and others reporting thousands of units. Request date-code and condition information, and compare markings against the original device to ensure that procurement does not introduce an electrically different revision.
Laboratory and Communication Equipment
The MC6840CFN-G can serve in legacy laboratory or communication equipment that depends on a programmable timing section for repeatable intervals, delayed events, or digital event counts. The part's verified placement in programmable timers and oscillators supports that role, and distributor availability makes it useful for sustaining older instrument platforms. The supplied evidence does not establish noise performance, frequency stability, supply tolerance, or environmental qualification, so those characteristics must come from the original manufacturer datasheet. For modifications, preserve the existing footprint and verify every connected signal rather than adapting the circuit around only the generic MC6840 family description.
Obsolete Equipment Continuation
The MC6840CFN-G is particularly relevant to an obsolete-equipment continuation program where documentation or original semiconductor supply has become difficult. Verified marketplace listings show several channels advertising the exact orderable MPN, including a $22.3619 starting price and separate inventory reports of 6240 and 9160 pieces as of the supplied snapshots. These figures support proactive procurement planning, but they do not eliminate counterfeit, traceability, or date-code risks. Purchase through an established distributor, request inspection evidence, preserve dry-packing controls where required, and cross-check the device marking against the original Rochester Electronics or MC6840 documentation.
工程参考数据： MC6840CFN-G ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 |
|---|---|
| Brand | Rochester Electronics, LLC |
| Product Type | MC6840 programmable timer module (PTM) |
| Minimum Advertised Price | $22.3619 as of 2026-10-28 |
关键差异点
- Exact legacy timer orderable designation （对比 Unspecified modern timer IC)
- Multiple verified distribution channels （对比 Single-channel generic substitute)
- Documented commercial availability （对比 No confirmed drop-in alternative)
设计说明
Do not substitute a generic timer for the MC6840CFN-G without validating the package, pinout, supply voltage, logic thresholds, clock range, counter width, and reset behavior against the original documentation. The supplied cross-reference results contain no confirmed drop-in substitute. A family-level or functional similarity is insufficient for legacy equipment because an incorrect signal mapping can produce timing errors without an obvious power failure.
Determine the original MC6840 supply limits and sequencing requirements before inserting a purchased MC6840CFN-G. The verified web data does not include operating voltage, quiescent current, or absolute-maximum ratings, so those values must come from the manufacturer datasheet. Check power rails at the device pins and confirm that the existing regulator, decoupling network, and interface pull-ups remain within the original design limits.
Procure only from a distributor that can document condition, date code, lot traceability, and inspection for the MC6840CFN-G. Verified inventory snapshots report 6240 pieces and 9160 pieces at separate channels as of the source dates, but these figures do not guarantee uniform date codes or modern-production status. For obsolete-equipment continuation, retain dry-packing and handling controls and compare the received top marking with the known-good component.
合规信息
The verified LCSC search snippet associates a listing with ROHS, but the supplied material does not provide a compliance declaration or test evidence for this exact MPN. All compliance fields are therefore treated as unknown.
