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Texas Instruments TLC552CN
- Part No.:
- TLC552CN
- Manufacturer:
- Texas Instruments
- Category:
- Programmable Timers and Oscillators
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
TLC552CN.pdf
- Description:
- IC OSC TIMER DUAL 2.8MHZ 14-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,336
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Product details
Overview
TLC552CN from Texas Instruments is a dual LinCMOS™ timer IC providing two independent 555-style timing circuits in a single 14-pin PDIP package. It delivers rail-to-rail CMOS output swing, 100 mA sink / 10 mA source capability, and operates from 1 V to 18 V supply with only 2 mW typical power at 5 V. Used in precision oscillator and monostable circuits requiring low supply current and high input impedance.
For engineers reviewing the TLC552CN datasheet, TLC552CN pinout, TLC552CN application, or TLC552CN equivalent, this page provides verified functional identity, validated pin mapping, confirmed operating range (0°C to 70°C), exact package dimensions (PDIP-14), and real-world timing performance data including astable frequency up to 2.8 MHz.
Technical Context
The TLC552CN integrates two identical timer blocks, each featuring independent trigger (≈1/3 VDD), threshold (≈2/3 VDD), reset, control voltage, discharge, and output terminals. Each timer supports astable, monostable, and pulse-width modulation configurations with internal flip-flop logic that prioritizes reset over trigger and trigger over threshold.
Its LinCMOS™ process enables 10¹² Ω typical input impedance, enabling use of smaller timing capacitors than bipolar 556 timers, and reduces supply-current spikes during transitions-minimizing decoupling capacitor requirements. The device is functionally interchangeable with NE556 and shares identical pinout for drop-in replacement in legacy designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1 V to 18 V - Enables operation from single-cell battery (1.2 V) up to industrial rails without level-shifting. |
| Operating Temperature | 0°C to 70°C - Qualified for commercial-grade embedded systems and instrumentation. |
| Output Sink/Source | 100 mA sink / 10 mA source typ - Directly drives LEDs, small relays, or MOSFET gates without external buffers. |
| Input Impedance | 10¹² Ω typ - Reduces loading on RC timing networks and improves accuracy with high-value resistors. |
| Astable Max Frequency | 2.8 MHz at VDD = 5 V - Supports high-speed clock generation and PWM applications beyond standard 555 limits. |
| Power Consumption | 2 mW typ at VDD = 5 V - Enables ultra-low-power timing in battery-operated devices. |
| Timing Accuracy | ±3% initial error - Ensures predictable delay/oscillation without calibration in cost-sensitive designs. |
Pinout & Package
Package: 14-pin Plastic Dual In-line Package (PDIP), 0.3-inch body width, through-hole mounting. RoHS-compliant NIPDAU lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Discharge (Timer #1) | Open-drain NMOS switch tied to ground when output is low - used to discharge timing capacitor in astable mode. |
| 2 | Trigger (Timer #1) | Falling-edge sensitive input; sets internal flip-flop when voltage drops below ≈1/3 VDD. |
| 3 | Output (Timer #1) | CMOS push-pull output with rail-to-rail swing and 100 mA sink capability. |
| 4 | Reset (Timer #1) | Asynchronous active-low override - forces output low and disables discharge switch regardless of other inputs. |
| 5 | Control Voltage (Timer #1) | Adjusts internal comparator reference voltages; default ≈2/3 VDD threshold and ≈1/3 VDD trigger. |
| 6 | Threshold (Timer #1) | Rising-edge sensitive input; resets flip-flop when voltage exceeds ≈2/3 VDD. |
| 7 | GND | Ground reference for all internal circuitry and I/O pins. |
| 8 | VDD | Positive supply rail - powers both timers and supports wide 1 V–18 V range. |
| 9 | Discharge (Timer #2) | Independent discharge switch for second timer - identical function to Pin 1. |
| 10 | Trigger (Timer #2) | Independent trigger input for second timer - identical function to Pin 2. |
| 11 | Output (Timer #2) | Second CMOS output - fully independent, rail-to-rail, with same drive strength as Pin 3. |
| 12 | Reset (Timer #2) | Asynchronous reset for Timer #2 - identical behavior to Pin 4. |
| 13 | Control Voltage (Timer #2) | Independent CV input for Timer #2 - allows separate modulation of each timer's thresholds. |
| 14 | Threshold (Timer #2) | Independent threshold input for Timer #2 - identical function to Pin 6. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent timers | Two fully isolated 555-compatible timing channels in one package - eliminates board space and BOM count vs. discrete 555s. |
| Rail-to-rail CMOS output | Output swings from GND to VDD across full supply range - ensures clean logic-level compatibility with mixed-voltage systems. |
| Ultra-low supply current spikes | Minimized transient current during output transitions - reduces need for large local decoupling capacitors. |
| High-impedance inputs (10¹² Ω) | Preserves RC time constant integrity and enables microamp-level timing networks - critical for long-delay applications. |
| NE556 pin-compatible | Direct drop-in replacement for legacy NE556 designs - no PCB or schematic changes required. |
Applications
| Precision Oscillator | LED Flasher Control |
|---|---|
Use Scenario: Generating stable square-wave clocks for microcontroller peripherals or sensor sampling at frequencies up to 2.8 MHz. IC Role / Device Role / Timing Role: Dual timer configured in astable mode with matched RC networks to produce precise, low-jitter clock signals. Use Value: ±3% timing accuracy and rail-to-rail output eliminate need for external level-shifting or trimming components. | Use Scenario: Driving multiple LEDs with variable blink rate and duty cycle in consumer electronics or status indicators. IC Role / Device Role / Timing Role: One timer generates base frequency; second timer modulates duty cycle via control voltage pin. Use Value: 100 mA sink capability per output directly drives up to 10 standard LEDs without external transistors. |
| Power Sequencing Controller | Industrial Timer Relay |
Use Scenario: Controlling startup sequence of multi-rail power supplies in embedded systems to prevent latch-up or inrush issues. IC Role / Device Role / Timing Role: Monostable configuration triggers delayed enable signals for DC/DC converters using independent reset and trigger inputs. Use Value: Asynchronous reset allows external system fault signals to immediately halt sequencing - improving safety and reliability. | Use Scenario: Replacing electromechanical time-delay relays in factory automation panels for motor start delays or safety interlocks. IC Role / Device Role / Timing Role: Astable + monostable cascaded configuration provides adjustable on/off cycles with high noise immunity. Use Value: 1 V–18 V operation supports direct connection to 12 V control rails; 10¹² Ω inputs reject EMI better than bipolar timers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual timer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NE556N | Bipolar process; higher supply current (10 mA typ); lower input impedance (1 MΩ); max 100 kHz oscillation. | Less accurate timing, higher power, limited to 5 V–15 V supply - unsuitable for battery or low-voltage systems. | Select NE556N only if legacy compatibility with older schematics is mandatory and low power is not required. |
| TLC552CD | Same die, SOIC-14 package; identical electrical specs; surface-mount footprint; RoHS-compliant. | Requires reflow assembly; smaller PCB area; not suitable for prototyping or through-hole breadboarding. | Choose TLC552CD for volume production where automated assembly and space savings outweigh through-hole convenience. |
Compared with NE556N, TLC552CN offers 500× lower input bias current and 50× lower quiescent power, enabling precision timing in energy-constrained systems; versus TLC552CD, it provides identical functionality in a hand-solderable PDIP package ideal for development and low-volume manufacturing.
Availability
TLC552CN is available at Aetrix Electronics and suitable for precision oscillator design, LED flasher control, power sequencing, and industrial timer relay applications requiring stable component supply across commercial temperature range.
Supply support for TLC552CN 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 is a global semiconductor leader delivering analog, embedded processing, and digital signal processing technologies since 1930.
The TLC552CN belongs to TI's LinCMOS™ timer product line, designed specifically for low-power, high-accuracy timing functions in commercial-grade instrumentation, consumer electronics, and industrial controls.
FAQ
What is the maximum operating supply voltage for the TLC552CN?
The TLC552CN supports a maximum supply voltage of 18 V, as specified in its Absolute Maximum Ratings. Operation at this voltage is validated across the full 0°C to 70°C temperature range, with electrical characteristics documented up to 18 V in the datasheet - including 12.6 V threshold level and 17.9 V high-level output voltage at 25°C.
Does the TLC552CN support single-cell battery operation?
Yes, the TLC552CN operates down to 1 V supply voltage, making it compatible with single alkaline or NiMH cells. At 1 V, it maintains functional timing behavior with validated trigger and threshold levels (e.g., 0.15 V trigger typ), and draws only 30 µA typical supply current - enabling multi-year battery life in low-duty-cycle timer applications.
Is the TLC552CN pin-compatible with the NE556?
Yes, the TLC552CN is functionally interchangeable with the NE556 and has identical pinout per the datasheet: both use 14-pin PDIP packaging with matching terminal assignments for discharge, trigger, output, reset, control voltage, threshold, GND, and VDD for each of two independent timers.
What is the input impedance of the TLC552CN trigger and threshold pins?
The TLC552CN features 10¹² Ω typical input impedance on all control inputs (trigger, threshold, reset, and control voltage), a direct result of its LinCMOS™ process. This value is explicitly stated in the datasheet and enables minimal loading of RC timing networks - critical for maintaining accuracy with high-value resistors (>1 MΩ) and small capacitors (<100 pF).
Can the TLC552CN drive a small relay directly?
Yes, the TLC552CN can directly drive small electromagnetic relays requiring ≤100 mA coil current at logic-compatible voltage levels. Its output sink capability is 100 mA typical (150 mA absolute max), and its rail-to-rail CMOS output ensures full VDD swing - allowing direct interface with 5 V or 12 V relay coils when used with appropriate flyback diode protection.
TLC552CN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LinCMOS™
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- 555 Type, Timer/Oscillator (Dual)
- Count:
- -
- Frequency:
- 2.8MHz
- Voltage - Supply:
- 1V ~ 18V
- Current - Supply:
- 1.6 mA
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 14-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
TLC552CN FAQ
1.How can I place an order for TLC552CN through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC552CN 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 TLC552CN reliable?
The price and inventory of TLC552CN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC552CN is usually 5 days.
3.What payment methods are accepted for TLC552CN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC552CN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC552CN?
TLC552CN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC552CN 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 TLC552CN?
For technical support, including TLC552CN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC552CN requirements.
6.How does Aetrix verify that TLC552CN is sourced from the original manufacturer or authorized distributors?
All TLC552CN 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 TLC552CN meets industry standards.
7.What is the process for return or replacement of TLC552CN?
All TLC552CN units undergo pre-shipment inspection (PSI). If there is an issue with TLC552CN, 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 TLC552CN part is unused and in its original packaging.
Return procedure for TLC552CN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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