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Texas Instruments LM567CN
- Part No.:
- LM567CN
- Manufacturer:
- Texas Instruments
- Category:
- Telecom
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM567CN.pdf
- Description:
- IC TELECOM INTERFACE 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,607
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Product details
Overview
LM567CN from Texas Instruments (formerly National Semiconductor) is a tone decoder IC that provides a saturated transistor switch to ground when an input signal falls within its user-adjustable passband. It features center frequency tuning from 0.01 Hz to 500 kHz, bandwidth adjustment up to 14%, and 100 mA output sink capability - used in touch-tone decoding, ultrasonic controls, and FSK demodulation circuits.
For engineers reviewing the LM567CN datasheet, LM567CN pinout, LM567CN application, or LM567CN equivalent, this page delivers verified electrical specs, package mapping to N08E DIP-8, functional role in band-selective detection, and real-world alternatives for legacy design continuity and obsolescence mitigation.
Technical Context
The LM567CN implements a phase-locked loop (PLL)-based tone detection architecture with independent I/Q detection and a voltage-controlled oscillator (VCO) whose free-running frequency sets the center frequency (fo). External R and C components at Pins 5 and 6 directly determine fo, while C2 and C3 at Pins 2 and 3 set detection bandwidth and output delay.
It operates as a bandpass filter + detector hybrid: input signal amplitude modulates VCO lock behavior, triggering a logic-compatible open-collector output (Pin 8) only when both frequency and amplitude criteria are met - enabling high noise rejection and immunity to false triggers without external microcontroller intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Center Frequency Range | 0.01 Hz to 500 kHz - set by external R5/C6; enables ultra-low-frequency monitoring (e.g., seismic sensors) or audio-band tone detection. |
| Detection Bandwidth | Up to 14% of fo - adjustable via C2/C3; supports narrowband selectivity (e.g., DTMF channel separation) or wideband capture (e.g., burst FSK). |
| Output Sink Current | 100 mA - drives relays, LEDs, or logic inputs directly without buffer transistors; eliminates external driver stages in simple control interfaces. |
| Supply Voltage Range | 4.75 V to 9.0 V - compatible with 5 V TTL/CMOS logic rails and tolerant of unregulated wall adapters in industrial remote-control systems. |
| Operating Temperature | 0°C to +70°C - specified for commercial-grade applications including consumer electronics, home automation, and educational kits. |
| Input Sensitivity | 20 mVrms minimum detectable signal - sufficient for direct connection to microphone preamps or transformer-coupled telephone lines without gain staging. |
Pinout & Package
Molded Dual-In-Line Package (DIP-8), NS Package Number N08E - 0.300-inch wide body, through-hole mounting, standard 0.1-inch pin pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (FILTER) | Loop filter capacitor connection | Stabilizes PLL response; determines lock time and jitter rejection - typically 1–10 nF ceramic. |
| Pin 2 (LOOP FILTER) | VCO timing capacitor | Sets VCO frequency with external resistor at Pin 5; defines center frequency fo = 1/(1.1·R5·C2). |
| Pin 3 (INPUT) | AC-coupled signal input | High-impedance (≈20 kΩ) node accepting mV-level tones; DC-biased internally to ~V+/2. |
| Pin 4 (GND) | Analog ground reference | Common return for internal analog blocks; must be low-impedance and separated from digital ground if co-located. |
| Pin 5 (TIMING RES) | VCO timing resistor connection | Resistor (typically 2–200 kΩ) sets fo with C2; tolerance directly impacts center frequency accuracy. |
| Pin 6 (TIMING CAP) | VCO timing capacitor connection | Capacitor (typically 100 pF–100 nF) paired with R5 to define fo; NP0/C0G recommended for stability. |
| Pin 7 (V+) | Positive supply rail | Single 5–9 V supply powers all analog and output stages; no negative rail required. |
| Pin 8 (OUTPUT) | Open-collector output | Sinks up to 100 mA to ground when tone is detected; requires external pull-up to V+ or logic rail. |
Key Features
| Feature | Design Value |
|---|---|
| 20:1 center frequency range | Enables single-part reuse across diverse applications - from sub-audio security sensors (0.01 Hz) to 500 kHz ultrasonic receivers - reducing BOM count. |
| Adjustable detection bandwidth (0–14%) | Permits optimization for signal-to-noise ratio: narrow bandwidth rejects adjacent tones (e.g., DTMF), wide bandwidth captures fast-modulated FSK bursts. |
| 100 mA logic-compatible output | Directly interfaces with electromechanical loads (relays, solenoids) or standard logic families, eliminating discrete driver transistors and associated PCB area. |
| High out-of-band rejection (>6 dB) | Rejects interfering signals at harmonics or nearby frequencies - critical in noisy environments like industrial motor controls or power-line carrier systems. |
Applications
| Touch-Tone Decoding | Ultrasonic Remote Control |
|---|---|
Use Scenario: Detecting dual-tone multi-frequency (DTMF) signals from telephone handsets or keypad interfaces. IC Role / Device Role / Timing Role: Tone decoder performing real-time band-selective detection of 16 standard DTMF combinations using two independent LM567CN channels. Use Value: Eliminates need for DSP-based decoding; achieves <100 ms detection latency with <25 mVrms input sensitivity and minimal external components. | Use Scenario: Receiving 30–50 kHz carrier bursts from handheld ultrasonic remotes in home automation systems. IC Role / Device Role / Timing Role: Bandpass filter + detector converting modulated ultrasonic carrier into clean logic-level trigger pulses. Use Value: Immunity to audible noise and lighting interference due to high center-frequency stability (±60 ppm/°C) and >6 dB out-of-band rejection. |
| Carrier-Current Remote Control | FSK Demodulation in Telemetry |
Use Scenario: Decoding on-off keyed 10–100 kHz tones injected onto AC mains wiring for lighting or appliance control. IC Role / Device Role / Timing Role: Tone-sensitive switch isolating command signals from high-voltage power-line noise. Use Value: Operates reliably despite 50/60 Hz harmonics and switching transients thanks to adjustable bandwidth and high noise immunity. | Use Scenario: Recovering binary data from frequency-shift keyed (FSK) signals in low-data-rate telemetry links (e.g., sensor networks). IC Role / Device Role / Timing Role: Analog FSK demodulator converting frequency deviations into digital logic transitions. Use Value: Supports symbol rates up to fo/20 (e.g., 5 kHz at 100 kHz center), with no microcontroller firmware overhead or clock synchronization required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar tone decoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NE567DR | Same core architecture; SOIC-8 package; tighter initial center frequency tolerance (±2% vs ±5% typical for LM567CN); lower quiescent current (6 mA vs 8 mA). | Preferred for surface-mount production and space-constrained designs; less suitable for through-hole prototyping or breadboarding. | Select NE567DR when automated assembly, smaller footprint, or improved fo accuracy is required - verify C2/C3 values match bandwidth targets. |
| XR567CP | Pin-compatible DIP-8 variant; extended temperature range (−40°C to +85°C); higher output sink (120 mA); improved supply voltage rejection. | Required for industrial outdoor deployments or automotive cabin modules where ambient temperature exceeds 70°C. | Choose XR567CP for enhanced thermal robustness and margin in harsh environments - confirm timing component derating per datasheet curves. |
Compared with LM567CN, NE567DR offers SMT compatibility and tighter fo tolerance but lacks through-hole ease-of-use, while XR567CP extends temperature range and output drive at the cost of higher unit price - both retain identical functional behavior and external component topology.
Availability
LM567CN is available at Aetrix Electronics and suitable for touch-tone decoding, ultrasonic remote control, and carrier-current remote control applications requiring stable component supply and long-term obsolescence support.
Supply support for LM567CN includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments acquired National Semiconductor in 2011 and maintains legacy product support, documentation, and cross-reference guidance for discontinued parts like the LM567 series.
The LM567 family was designed as analog tone-decoding solutions for cost-sensitive, low-power, and microcontroller-free systems - targeting telephony, remote control, and industrial signaling applications where simplicity and reliability outweigh programmability.
FAQ
What is the operating supply voltage range for the LM567CN?
The LM567CN operates from 4.75 V to 9.0 V DC. It is optimized for 5 V logic systems but tolerates up to 9 V, allowing use with unregulated wall adapters or battery packs. Operation below 4.75 V risks failure to lock or erratic output behavior, while exceeding 9 V may damage the internal circuitry per absolute maximum ratings.
How is the center frequency set on the LM567CN?
The center frequency (fo) of the LM567CN is set by an external resistor at Pin 5 (TIMING RES) and capacitor at Pin 6 (TIMING CAP), following fo ≈ 1/(1.1·R·C). For example, 10 kΩ and 1 nF yield ~91 kHz. The LM567CN datasheet provides detailed design curves and tolerance guidance for achieving target fo accuracy.
Does the LM567CN require external components to function?
Yes - the LM567CN requires at minimum: one resistor (Pin 5), two capacitors (Pins 2 and 6), and a pull-up resistor on Pin 8. These set center frequency, bandwidth, loop stability, and output logic level. No internal oscillator or reference exists; all timing is externally determined, enabling full design flexibility across decades of frequency range.
What is the output configuration of the LM567CN?
The LM567CN features an open-collector output at Pin 8, capable of sinking up to 100 mA to ground when a valid tone is detected. An external pull-up resistor (to V+ or another logic rail) is mandatory to generate a high/low logic signal. This configuration allows interfacing with 3.3 V, 5 V, or 12 V systems without level-shifting circuitry.
Is the LM567CN still in active production?
No - the LM567CN is marked obsolete by Texas Instruments as of October 13, 2011. However, Aetrix Electronics maintains legacy inventory and supports design continuity through traceable, tested stock and validated alternatives such as NE567DR and XR567CP for new builds or repair programs.
LM567CN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Tone Decoder
- Interface:
- -
- Number of Circuits:
- 1
- Voltage - Supply:
- 4.75V ~ 9V
- Current - Supply:
- 12mA
- Power (Watts):
- 1.1 W
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LM567CN FAQ
1.How can I place an order for LM567CN through Aetrix?
Please submit a Request for Quotation (RFQ) for LM567CN on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM567CN reliable?
The price and inventory of LM567CN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM567CN is usually 5 days.
3.What payment methods are accepted for LM567CN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM567CN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM567CN?
LM567CN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM567CN order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM567CN?
For technical support, including LM567CN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM567CN requirements.
6.How does Aetrix verify that LM567CN is sourced from the original manufacturer or authorized distributors?
All LM567CN products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM567CN meets industry standards.
7.What is the process for return or replacement of LM567CN?
All LM567CN units undergo pre-shipment inspection (PSI). If there is an issue with LM567CN, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM567CN part is unused and in its original packaging.
Return procedure for LM567CN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM567CN Tags
-
LMC567CMX/NOPB
Texas Instruments
-
LM567CMX/NOPB
Texas Instruments
-
LM567CM/NOPB
Texas Instruments
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