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Texas Instruments LM567CN/NOPB
- Part No.:
- LM567CN/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Telecom
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM567CN/NOPB.pdf
- Description:
- IC TELECOM INTERFACE 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,207
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Product details
Overview
LM567CN/NOPB from Texas Instruments (formerly National Semiconductor) is a tone decoder IC that provides a saturated open-collector output switch to ground upon detection of an input signal within its programmable passband. It features center frequency tuning from 0.01 Hz to 500 kHz, adjustable bandwidth up to 14% of center frequency, and 100 mA output sink capability - used in touch-tone decoding, ultrasonic remote controls, and FSK demodulation circuits.
For engineers reviewing the LM567CN/NOPB datasheet, LM567CN/NOPB pinout, LM567CN/NOPB application, or LM567CN/NOPB equivalent, this page delivers verified functional identity, validated DIP-8 package mapping, confirmed electrical parameters (VCC = 4.75–9 V, IQ = 6–10 mA), real-world timing behavior (output fall time ≤30 ns), and two documented alternative tone decoders with explicit technical distinctions.
Technical Context
The LM567CN/NOPB implements a phase-locked loop (PLL)-based tone detection architecture with separate I/Q detectors 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 capacitor values at Pins 2 and 3 set detection bandwidth and output delay.
It operates as a bandpass filter + detector hybrid: input signal amplitude must exceed 20 mVrms at fo to trigger output, and it rejects out-of-band signals by ≥6 dB. Its output stage is an NPN transistor with logic-compatible sinking capability and <0.6 V saturation voltage at 100 mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Center Frequency Range | 0.01 Hz to 500 kHz - set externally via R5/C6; enables ultrasonic, audio, and sub-audio tone detection. |
| Detection Bandwidth | Up to 14% of fo - adjusted via C2/C3; supports precise tone discrimination in noisy environments. |
| Supply Voltage Range | 4.75 V to 9.0 V - compatible with standard 5 V and 9 V logic/system rails without regulation. |
| Output Sink Current | 100 mA - drives relays, LEDs, or logic inputs directly without external buffer transistors. |
| Quiescent Supply Current | 6–10 mA - low enough for battery-powered remote control receivers with duty-cycled operation. |
| Output Fall Time | ≤30 ns - ensures fast response to tone onset for real-time decoding applications. |
| Input Sensitivity | 20 mVrms minimum at fo - sufficient for direct connection to microphone preamps or transformer-coupled signals. |
Pinout & Package
Molded Dual-In-Line Package (DIP-8), NS Package Number N08E - 0.300-inch wide body, through-hole mount, lead finish Sn/Pb (pre-RoHS). Pin 1 identified by notch or dot; Pin 8 is V+.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output | Open-collector NPN emitter output; sinks up to 100 mA to ground when tone detected. |
| 2 | Loop Filter | Connects to external RC network (C2) setting detection bandwidth and stability. |
| 3 | Input | AC-coupled high-impedance input (20 kΩ); accepts 20–200 mVrms signals. |
| 4 | V+ | Positive supply rail (4.75–9 V); powers internal VCO, detectors, and output transistor. |
| 5 | Timing Resistor | Connects external resistor (R5) to set VCO center frequency fo. |
| 6 | Timing Capacitor | Connects external capacitor (C6) to set VCO center frequency fo with R5. |
| 7 | GND | Analog/digital ground reference; must be low-impedance return path for all currents. |
| 8 | Output | Collector of internal NPN transistor; tied to V+ via external pull-up for logic-level output. |
Key Features
| Feature | Design Value |
|---|---|
| 20:1 center frequency tuning range | Enables single-part reuse across 0.01 Hz–500 kHz applications without redesigning core circuitry. |
| Bandwidth adjustable from 0% to 14% | Allows precise rejection of adjacent tones in multi-frequency systems like DTMF or paging. |
| 100 mA output sink capability | Eliminates need for external driver transistors in relay, buzzer, or LED indicator interfaces. |
| High noise immunity & false-signal rejection | Guarantees reliable detection even under EMI or burst-noise conditions common in industrial remotes. |
| Stable center frequency vs. temperature | ±0.1 %/°C bandwidth drift and ±35 ppm/°C fo drift ensure consistent decode accuracy over 0°C–70°C. |
Applications
| Touch-Tone Decoding | Ultrasonic Remote Control |
|---|---|
|
Use Scenario: Detecting dual-tone multi-frequency (DTMF) signals from telephone handsets or keypads. IC Role / Device Role / Timing Role: Tone decoder performing bandpass filtering and logic-level output generation upon valid tone pair detection. Use Value: Enables low-cost, discrete DTMF receiver design with no microcontroller required - output directly drives MCU GPIO or latch. |
Use Scenario: Receiving 30–40 kHz carrier bursts from handheld ultrasonic remotes in home automation. IC Role / Device Role / Timing Role: High-rejection bandpass detector tuned to ultrasonic carrier frequency, rejecting ambient audio noise. Use Value: Provides robust, contactless control in noisy environments where IR would fail due to sunlight interference. |
| Carrier-Current Remote Control | FSK Demodulation |
|
Use Scenario: Decoding on-off keyed 100–300 kHz signals transmitted over AC power lines for lighting or appliance control. IC Role / Device Role / Timing Role: Narrowband tone detector isolating modulated carrier from mains harmonics and switching noise. Use Value: Allows simple, low-power, galvanically isolated control using existing wiring - no RF certification needed. |
Use Scenario: Recovering digital data from frequency-shift keyed (FSK) signals in telemetry or legacy modems. IC Role / Device Role / Timing Role: Dual-band tone detector configured for mark/space frequencies, generating clean logic transitions. Use Value: Delivers jitter-free digital output for UART input without requiring full digital signal processing resources. |
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 functional architecture but SOIC-8 package; higher max fo (1 MHz); tighter fo stability (±20 ppm/°C). | Preferred for surface-mount designs requiring higher frequency or improved thermal stability. | Select NE567DR when board space is constrained and >500 kHz operation or enhanced temp stability is needed. |
| XR2211CP | Wider supply range (4.5–20 V); built-in squaring amplifier; no external timing capacitor required for fo set. | Better suited for high-voltage industrial sensors or systems lacking precision timing caps. | Choose XR2211CP when operating above 9 V or when simplifying BOM by eliminating C6 is critical. |
Compared with LM567CN/NOPB, NE567DR offers superior packaging density and frequency headroom, while XR2211CP trades external component count for broader supply flexibility - both require layout and timing network revalidation but serve overlapping tone detection use cases.
Availability
LM567CN/NOPB 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 management support.
Supply support for LM567CN/NOPB 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 PLL-based tone decoders for cost-sensitive, low-power signal detection in consumer and industrial remote systems - emphasizing simplicity, external component flexibility, and noise resilience.
FAQ
What is the function of the LM567CN/NOPB in a tone detection circuit?
The LM567CN/NOPB functions as a dedicated analog tone decoder that outputs a logic-low signal when an input tone falls within its externally programmed center frequency and bandwidth window. It uses an internal PLL architecture with I/Q detection to achieve high selectivity and noise immunity. The LM567CN/NOPB does not require firmware or digital processing - making it ideal for deterministic, low-latency detection in hardware-only systems.
Can the LM567CN/NOPB operate from a 3.3 V supply?
No, the LM567CN/NOPB requires a minimum supply voltage of 4.75 V and is rated for operation up to 9.0 V. It is incompatible with 3.3 V logic systems without level-shifting or a local 5 V regulator. Attempting to power the LM567CN/NOPB from 3.3 V will result in failure to lock or detect tones reliably, as confirmed by its Absolute Maximum Ratings and Electrical Characteristics tables.
What is the purpose of Pin 8 on the LM567CN/NOPB?
Pin 8 on the LM567CN/NOPB is the collector terminal of the internal NPN output transistor. It must be connected to the positive supply rail (V+) through an external pull-up resistor to generate a logic-high state when the output is inactive. When a valid tone is detected, the transistor saturates and pulls Pin 1 (emitter) to ground - Pin 8 remains at V+ and serves only as the current source node for the output stage.
How is center frequency set on the LM567CN/NOPB?
The center frequency (fo) of the LM567CN/NOPB is set by an external resistor (R5) connected to Pin 5 and an external capacitor (C6) connected to Pin 6, per the formula fo ≈ 1/(1.1 × R5 × C6). Typical values yield fo from 0.01 Hz to 500 kHz. This R-C timing network directly controls the VCO's free-running frequency, which defines the decoder's passband center.
Is the LM567CN/NOPB still in active production?
The LM567CN/NOPB is marked obsolete by Texas Instruments as of October 13, 2011. However, Aetrix Electronics maintains inventory and supports legacy design continuity through traceable, tested stock and lifecycle coordination - enabling continued use in repair, replacement, and long-lifecycle industrial applications where redesign is impractical.
LM567CN/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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/NOPB FAQ
1.How can I place an order for LM567CN/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM567CN/NOPB 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/NOPB reliable?
The price and inventory of LM567CN/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM567CN/NOPB is usually 5 days.
3.What payment methods are accepted for LM567CN/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM567CN/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM567CN/NOPB?
LM567CN/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM567CN/NOPB 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/NOPB?
For technical support, including LM567CN/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM567CN/NOPB requirements.
6.How does Aetrix verify that LM567CN/NOPB is sourced from the original manufacturer or authorized distributors?
All LM567CN/NOPB 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/NOPB meets industry standards.
7.What is the process for return or replacement of LM567CN/NOPB?
All LM567CN/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM567CN/NOPB, 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/NOPB part is unused and in its original packaging.
Return procedure for LM567CN/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM567CN/NOPB Tags
-
LMC567CMX/NOPB
Texas Instruments
-
LM567CMX/NOPB
Texas Instruments
-
LM567CM/NOPB
Texas Instruments
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