LM567 Reference Tables, Pins & Specifications

Pin reference

Signal names, electrical functions and connection guidance

PDIP-8

Physical pin numbers8 pins

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LM567 pin functions and connections
Signal	Type	Function & connection
OF_CAP	Output filter	Sets output filtering and detection delay. Connection guidance Connect 2.2 µF to ground; positive end at pin 1. Use C3 at least twice the loop-filter capacitor in the illustrated design.
LF_CAP	Loop filter	Filters the phase-locked-loop control signal. Connection guidance Connect 1 µF to ground; positive end at pin 2. This capacitor affects capture bandwidth and response time.
IN	Analog tone input	Accepts the tone to be detected. Connection guidance Feed the grounded signal generator through a 100 nF series capacitor. Use 100 mV RMS near 909 Hz for this example, not a rail-level digital signal.
VCC	Positive supply	Powers the decoder circuitry. Connection guidance Connect regulated +5 V, with 100 nF and 1 µF local bypass to ground.
T_RES	Timing resistor	One side of the oscillator timing resistor. Connection guidance Connect R1 = 10 kΩ between pins 5 and 6. The resistor goes between these pins, not from pin 5 to VCC.
T_CAP	Timing capacitor	Oscillator timing node. Connection guidance Connect C1 = 100 nF to ground, and the other end of R1 from pin 5. Use stable timing parts and short traces.
GND	Ground return	Common supply and signal return. Connection guidance Join supply negative, filter returns and signal-generator ground.
OUT	Open-collector output	Sinks current when a sufficient signal is detected in the passband. Connection guidance Add a 10 kΩ pull-up to +5 V and read with a high-impedance meter. LOW means detected. Without the pull-up, the released output is not driven HIGH.

Supply and signal reference

LM567C · 5 V / 25°C electrical tests

Manufacturer-referenced values6 parameters

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Parameter	Value	Conditions / notes
Operating supply	3.5–8.5 V	Recommended operating table; use 5 V for the example
Selected ambient	0 to +70°C	CN / CM ordering options
Quiescent supply current	7 mA typical; 10 mA maximum	RL = 20 kΩ
Activated supply current	12 mA typical; 15 mA maximum	RL = 20 kΩ
Input resistance	15 kΩ minimum; 20 kΩ typical	Tone input pin 3
Smallest detected input	20 mV RMS typical; 25 mV RMS maximum	Input at center frequency; manufacturer IL = 100 mA condition

Detection depends on frequency, amplitude, filtering and the manufacturer test conditions.

Timing and selectivity

External components define the application

Manufacturer-referenced values6 parameters

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Parameter	Value	Conditions / notes
Approximate center frequency	1 / (1.1 × R1 × C1)	R in ohms; C in farads; result in hertz
Timing resistor	Pins 5 to 6	10 kΩ in the example
Timing capacitor	Pin 6 to ground	100 nF in the example
Highest center frequency	100 kHz minimum; 500 kHz typical	500 kHz is not a guaranteed limit for every unit
Largest detection bandwidth	14% typical; 10–18% limits	Maximum-setting test; not the width of every filter network
Fastest on/off cycling	f₀ / 20 typical	Reference condition, not instantaneous detection

R/C tolerance shifts the center; filter values and signal amplitude determine the usable detection band.

Open-collector output

Pin 8 sinks current on detection

Manufacturer-referenced values6 parameters

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Parameter	Value	Conditions / notes
Output LOW at 30 mA	0.2 V typical; 0.4 V maximum	25 mV test input
Output LOW at 100 mA	0.6 V typical; 1.0 V maximum	25 mV test input
Output leakage	0.01 µA typical; 25 µA maximum	Output at 15 V
Output rise / fall time	150 ns / 30 ns typical	Electrical test circuit
Example pull-up	10 kΩ to +5 V	Less than 0.5 mA when LOW
Released output	HIGH through the pull-up	The IC does not actively source that HIGH voltage

Large sink currents increase power dissipation; the lightly loaded example avoids that condition.

909 Hz detector example

Grounded signal generator and regulated 5 V

Manufacturer-referenced values7 parameters

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Parameter	Value	Conditions / notes
Input tone	100 mV RMS near 909 Hz	AC-coupled through 100 nF to pin 3
R1 / C1	10 kΩ / 100 nF	R1: 5–6; C1: 6–ground
C2 loop filter	1 µF	Pin 2 to ground; positive at the pin
C3 output filter	2.2 µF	Pin 1 to ground; at least 2 × C2
Supply bypass	100 nF + 1 µF	Across pins 4 and 7, near the package
Output reading	LOW after detection settles	High-impedance meter on pin 8
Nominal arithmetic	909.1 Hz	1 / (1.1 × 10000 × 100 × 10⁻⁹)

This is an illustrative tuned detector, not a specified instrument. Sweep and calibrate the assembled circuit.

Package and stress limits

LM567CN/NOPB · PDIP-8

Manufacturer-referenced values6 parameters

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Parameter	Value	Conditions / notes
Pitch / mounting	2.54 mm	Through-hole
Package numbering	8 physical pins	Top view; counterclockwise from the marker
Supply stress limit	9 V absolute maximum	Do not confuse with 8.5 V recommended maximum
Output stress limit	15 V at pin 8	External collector voltage; observe dissipation
Storage	−65 to +150°C	Unpowered
Layout	Short timing and filter returns	Separate output-load currents from the sensitive input path

Absolute ratings are stress boundaries. The downloadable land pattern must be checked against the chosen assembly process.