My Inquiry
My Account
Texas Instruments LM567CMX
- Part No.:
- LM567CMX
- Manufacturer:
- Texas Instruments
- Category:
- Telecom
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM567CMX.pdf
- Description:
- IC TELECOM INTERFACE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,668
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM567CMX 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 a logic-compatible output with 100 mA sink capability - used in touch-tone decoding, ultrasonic controls, and FSK demodulation.
For engineers reviewing the LM567CMX datasheet, LM567CMX pinout, LM567CMX application, or LM567CMX equivalent, key selection considerations include its VCO-based detection architecture, external R/C-tuned center frequency and bandwidth, output delay control, temperature-stable center frequency (±60 ppm/°C), and compatibility with 5 V to 9 V supply rails.
Technical Context
The LM567CMX implements a phase-locked loop (PLL)-based tone detection architecture, where an internal voltage-controlled oscillator (VCO) sets the center frequency (fo) and drives I/Q detectors. Detection is triggered only when input signal amplitude and frequency match fo within the externally configured bandwidth.
Bandwidth is set by external capacitors C2 and C3, enabling adjustment from 0% to 14% of fo; output delay is controlled via external capacitor C4. The device operates over 0°C to +70°C and supports supply voltages from 4.75 V to 9.0 V with quiescent current ≤10 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Center Frequency Range | 0.01 Hz to 500 kHz - set by external R5 and C6; enables ultra-low-frequency monitoring or high-speed tone detection. |
| Detection Bandwidth | Up to 14% of fo - adjustable via C2/C3; allows selective response to narrow or wide tone windows. |
| Output Sink Current | 100 mA - directly drives relays, LEDs, or logic inputs without external buffering. |
| Supply Voltage Range | 4.75 V to 9.0 V - compatible with standard 5 V and 9 V systems; stable operation across rail variation. |
| Center Frequency Stability | ±60 ppm/°C (0°C to +70°C) - ensures reliable decode accuracy across commercial temperature range. |
| Input Sensitivity | 20 mVrms min at fo - detects low-level tones without preamplification in noise-limited environments. |
| Output Rise/Fall Time | 150 ns / 30 ns - supports fast tone burst detection and high-cycle-rate applications (up to fo/20). |
Pinout & Package
LM567CMX is housed in an 8-pin SOIC package (NS Package Number M08A), surface-mount compatible with standard reflow profiles (215°C vapor phase, 220°C infrared).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUTPUT) | Open-collector output | Sinks up to 100 mA to ground when tone is detected; requires external pull-up for logic-high level. |
| 2 (FILTER) | Bandwidth control node | Connects external C2/C3 to set detection bandwidth as % of center frequency. |
| 3 (INPUT) | AC-coupled signal input | Accepts 20–25 mVrms tone signals; high-impedance (≥15 kΩ) interface minimizes loading. |
| 4 (V+) | Positive supply | 4.75–9.0 V DC input; powers internal VCO, detector, and output stage. |
| 5 (TIMING RES) | VCO timing resistor connection | External resistor (R5) sets center frequency with C6; 20-to-1 range supported. |
| 6 (TIMING CAP) | VCO timing capacitor connection | External capacitor (C6) works with R5 to define fo; stability enhanced by low-leakage ceramic or film type. |
| 7 (GND) | Analog/digital ground reference | Common return for supply, input, filter, and output; must be low-impedance for noise immunity. |
| 8 (OUTPUT) | Secondary output terminal | Same node as Pin 1; dual-pad layout improves current handling and thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Externally programmable center frequency | Set precisely via R5 and C6 - eliminates need for fixed-frequency ICs or crystal replacements. |
| Adjustable detection bandwidth | 0–14% of fo via C2/C3 - enables robust rejection of harmonics and adjacent-channel interference. |
| High noise immunity | −6 dB minimum input-to-noise ratio (140 kHz BW) - maintains decode integrity in electrically noisy environments. |
| Logic-compatible open-collector output | 100 mA sink capability - interfaces directly with TTL, CMOS, or discrete loads without level-shifting. |
| Temperature-stable VCO | ±60 ppm/°C drift (0°C to +70°C) - sustains accurate tone recognition across operating range without recalibration. |
Applications
| Touch-Tone Decoding | Ultrasonic Remote Control |
|---|---|
Use Scenario: Detecting DTMF tones from telephone lines or audio streams in security panels and PBX interfaces. IC Role / Device Role / Timing Role: Tone decoder providing ground-switched output per valid digit; replaces discrete filter banks and comparators. Use Value: Reduces BOM count and PCB area vs. analog filter + comparator solutions; supports multi-frequency detection with single IC. | Use Scenario: Receiving 30–40 kHz carrier bursts from handheld remotes in home automation or industrial equipment. IC Role / Device Role / Timing Role: Bandpass-selective detector rejecting ambient noise while responding only to modulated ultrasonic carriers. Use Value: Enables contactless control without RF licensing; immunity to visible light and EMI improves reliability over photodiode-based systems. |
| FSK Demodulation | Frequency Monitoring System |
Use Scenario: Recovering digital data from audio-frequency FSK signals in legacy telemetry, modems, or sensor transmitters. IC Role / Device Role / Timing Role: Dual-band tone detector identifying mark/space frequencies; output toggles on tone transitions. Use Value: Eliminates need for full digital signal processing; low-power, analog-domain decoding suitable for battery-operated endpoints. | Use Scenario: Monitoring generator output, motor RPM, or vibration frequency in industrial maintenance tools. IC Role / Device Role / Timing Role: Precision oscillator and frequency discriminator - converts periodic input into gated output pulses proportional to frequency. Use Value: Provides real-time frequency readout without microcontroller firmware; analog simplicity enhances field-serviceability. |
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; ±100 ppm/°C center frequency drift (vs. LM567CMX's ±60 ppm/°C); wider max bandwidth (16% vs. 14%). | Higher temperature sensitivity may require recalibration in wide-temperature deployments; otherwise drop-in for most 5 V designs. | Select NE567DR only if cost is primary constraint and thermal drift is acceptable. |
| TL567CDR | TI-revised version with improved PSRR (−65 dB vs. −50 dB) and tighter bandwidth tolerance (±1% vs. ±2%); same pinout and R/C programming. | Better noise rejection in mixed-signal boards; identical external component values enable direct substitution. | Prefer TL567CDR for new designs requiring higher supply noise immunity and production consistency. |
Compared with LM567CMX, NE567DR trades center frequency stability for lower cost, while TL567CDR improves supply noise rejection and bandwidth accuracy without changing layout - making it the preferred upgrade path for new designs needing enhanced robustness.
Availability
LM567CMX is available at Aetrix Electronics and suitable for touch-tone decoding, ultrasonic remote control, and FSK demodulation requiring stable component supply and long-term obsolescence management support.
Supply support for LM567CMX 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, datasheets, and cross-reference guidance for discontinued components like the LM567 series.
The LM567 family was designed as analog tone decoders for cost-sensitive, low-power detection tasks - targeting telephony, remote control, and industrial monitoring where microcontroller-based DSP is impractical.
FAQ
What is the operating supply voltage range for the LM567CMX?
The LM567CMX operates from 4.75 V to 9.0 V DC. Its quiescent supply current remains ≤10 mA across this range, and output saturation voltage stays below 0.6 V at 100 mA sink load. This makes the LM567CMX compatible with both 5 V logic systems and 9 V battery-powered applications without additional regulation.
How is the center frequency set on the LM567CMX?
The center frequency of the LM567CMX is set by an external resistor (connected to Pin 5) and capacitor (connected to Pin 6), using the formula fo ≈ 1/(1.1 × R × C). Typical values span 0.01 Hz to 500 kHz, and the 20-to-1 frequency range allows one design to cover multiple bands via component changes - no firmware or hardware revision needed.
Does the LM567CMX require external components to function?
Yes, the LM567CMX requires seven external passive components: one timing resistor (Pin 5), one timing capacitor (Pin 6), two bandwidth-setting capacitors (Pins 2A/2B), one input coupling capacitor, one output pull-up resistor, and one output delay capacitor (Pin 4). These define center frequency, bandwidth, sensitivity, and response timing - no internal defaults exist.
What is the maximum detection bandwidth of the LM567CMX?
The LM567CMX supports a maximum detection bandwidth of 14% of its center frequency (fo), adjustable via external capacitors C2 and C3. At 10 kHz fo, this yields ±1.4 kHz window; at 100 kHz, ±14 kHz. Bandwidth skew remains under 2% of fo, ensuring symmetrical passband response.
Is the LM567CMX still in active production?
No - the LM567CMX was marked obsolete by National Semiconductor on October 13, 2011. However, Aetrix Electronics maintains legacy inventory and offers traceable, tested units sourced from authorized channels, with full documentation and application support for ongoing maintenance and replacement needs.
LM567CMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM567CMX FAQ
1.How can I place an order for LM567CMX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM567CMX 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 LM567CMX reliable?
The price and inventory of LM567CMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM567CMX is usually 5 days.
3.What payment methods are accepted for LM567CMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM567CMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM567CMX?
LM567CMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM567CMX 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 LM567CMX?
For technical support, including LM567CMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM567CMX requirements.
6.How does Aetrix verify that LM567CMX is sourced from the original manufacturer or authorized distributors?
All LM567CMX 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 LM567CMX meets industry standards.
7.What is the process for return or replacement of LM567CMX?
All LM567CMX units undergo pre-shipment inspection (PSI). If there is an issue with LM567CMX, 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 LM567CMX part is unused and in its original packaging.
Return procedure for LM567CMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM567CMX Tags
-
LMC567CMX/NOPB
Texas Instruments
-
LM567CMX/NOPB
Texas Instruments
-
LM567CM/NOPB
Texas Instruments
-
VSC8531XMW-02
Microchip Technology
-
VSC8531XMW-05
Microchip Technology
-
GPY115C0VI
MaxLinear, Inc.
-
SI32185-A-FMR
Skyworks Solutions Inc.
-
VSC8541XMV-05
Microchip Technology
-
SI32178-B-FM1R
Skyworks Solutions Inc.
-
GPY215C0VI
MaxLinear, Inc.
-
CPC7514ZTR
Littelfuse Inc.
-
VSC8502XML-03
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
