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Texas Instruments TLC555CD
- Part No.:
- TLC555CD
- Manufacturer:
- Texas Instruments
- Category:
- Programmable Timers and Oscillators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TLC555CD.pdf
- Description:
- IC OSC SGL TIMER 2.1MHZ 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:10,792
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Product details
Overview
TLC555CD from Texas Instruments is a CMOS monolithic timer IC designed for precision timing, pulse generation, and sequential control in single-supply systems. It operates from 2V to 15V, delivers rail-to-rail CMOS output swing, sinks up to 100mA (typ), sources 10mA (typ), and consumes only 1mW at 5V - enabling low-power astable/monostable operation up to 2.1MHz in industrial and consumer timing circuits.
For engineers reviewing the TLC555CD datasheet, TLC555CD pinout, TLC555CD application, or TLC555CD equivalent, key selection considerations include its functional interchangeability with NE555, low input bias current (<75pA), supply-voltage-independent timing accuracy, high ESD tolerance (±1000V HBM), and SOIC-8 package compatibility with legacy 555 footprints.
Technical Context
The TLC555CD implements a dual-comparator architecture with an SR latch and open-drain discharge switch, where THRES and TRIG inputs reference internal resistive divider nodes at ≈⅔VDD and ≈⅓VDD respectively. Its high-impedance CMOS inputs enable use of smaller timing capacitors than bipolar 555 timers, improving timing resolution and reducing component count.
Unlike NE555, it features rail-to-rail output drive, low quiescent current (350µA typ at 5V), and integrated ESD protection. The CONT pin allows dynamic threshold adjustment, supporting linear ramp generation and PWM with external voltage control - all while maintaining pin compatibility with industry-standard 555 layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2V to 15V - supports battery-powered and wide-input industrial supplies without regulation. |
| Max Operating Frequency | 2.1MHz - enables high-speed pulse generation and fast timing intervals in astable mode. |
| Output Sink Current | 100mA typical - directly drives LEDs, relays, or logic gates without external buffers. |
| Input Bias Current | <75pA max - minimizes capacitor leakage error and enables long-duration timing (seconds to hours). |
| Timing Accuracy Drift | 0.1–0.5%/V supply sensitivity - ensures stable delay/pulse width across varying VDD during operation. |
| ESD Rating | ±1000V HBM - meets ANSI/ESDA/JEDEC JS-001 for robust handling in manufacturing and field environments. |
| Operating Temperature | 0°C to +70°C - rated for commercial-grade applications including instrumentation and consumer electronics. |
Pinout & Package
Package: SOIC-8 (4.9mm × 6.0mm), RoHS-compliant, surface-mountable with standard 1.27mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Return path for all internal circuitry and discharge current; must be low-impedance for stable timing. |
| TRIG (Pin 2) | Start-of-timing input | Active-low edge-sensitive trigger: falling below ≈⅓VDD initiates monostable output high or astable cycle. |
| OUT (Pin 3) | Timer output | CMOS push-pull output capable of rail-to-rail swing and 100mA sink - drives loads directly. |
| RESET (Pin 4) | Asynchronous reset | Active-low override: forces OUT low and DISCH low regardless of TRIG/THRES state; requires pull-up if unused. |
| CONT (Pin 5) | Threshold control | Adjusts internal comparator reference (≈⅔VDD); bypass capacitor here suppresses noise and stabilizes timing. |
| THRES (Pin 6) | End-of-timing input | Falling below ≈⅔VDD resets latch and ends timing interval; tied to DISCH in standard configurations. |
| DISCH (Pin 7) | Discharge switch | Open-drain NMOS output that shorts timing capacitor to GND during low-output phase. |
| VDD (Pin 8) | Power supply | Single positive supply input; decoupling capacitor (0.1µF) required near pin for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail CMOS output | Enables full-swing logic interfacing with TTL, CMOS, and MOS families without level-shifting. |
| Ultra-low input bias current (<75pA) | Permits use of high-value RC networks for accurate long-duration timing (e.g., >100s with 1MΩ/100nF). |
| Functionally interchangeable with NE555 | Same 8-pin SOIC footprint and pinout - drop-in replacement in existing 555 designs with improved power/performance. |
| Supply-voltage-independent timing | Threshold and trigger levels scale with VDD, making timing intervals stable across supply variations. |
| High ESD tolerance (±1000V HBM) | Reduces need for external protection in board-level ESD-prone environments like handheld devices. |
Applications
| Precision Timing | Pulse Width Modulation |
|---|---|
|
Use Scenario: Generating accurate time delays in microcontroller-based sensor sampling systems where jitter must be <1%. IC Role / Device Role / Timing Role: Monostable timer triggered by MCU GPIO to initiate calibrated ADC conversion windows. Use Value: Low input bias current and supply-insensitive thresholds ensure ±0.5% timing accuracy over 0–70°C and 3–12V supply range. |
Use Scenario: Controlling LED brightness in automotive interior lighting with adjustable duty cycle via potentiometer on CONT pin. IC Role / Device Role / Timing Role: Astable multivibrator with variable RA/RB network and voltage-controlled CONT bias. Use Value: Rail-to-rail output and 100mA sink capability drive multiple LEDs directly; ESD rating supports vehicle assembly line handling. |
| Linear Ramp Generation | Time Delay Generator |
|
Use Scenario: Creating sawtooth waveforms for analog-to-digital converter calibration in test equipment. IC Role / Device Role / Timing Role: Monostable configured with constant-current charge into timing capacitor, controlled via CONT voltage. Use Value: High-impedance CONT input allows precise voltage programming; low supply current minimizes thermal drift in precision references. |
Use Scenario: Introducing fixed startup delays in power supply sequencing for FPGA-based systems. IC Role / Device Role / Timing Role: Single-shot timer triggered by PWR_OK signal to hold reset until DC/DC converters stabilize. Use Value: RESET pin override ensures deterministic release even during brown-out; SOIC-8 package fits compact PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar timer IC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NE555P | Bipolar process; higher supply current (3–6mA), lower output sink (200mA but with VCE(sat) drop), no rail-to-rail output. | Suitable for high-current, low-precision legacy designs; lacks ESD protection and low-power operation. | Select NE555P only when driving heavy inductive loads requiring higher peak current, and where layout cannot accommodate SOIC-8. |
| LMC555IMX/NOPB | CMOS like TLC555CD but with wider temp range (–40°C to +105°C); identical pinout and electrical specs except 1.5mW power at 5V. | Better suited for extended-temperature industrial or outdoor applications; same PCB footprint and design rules. | Choose LMC555IMX/NOPB for new designs targeting –40°C operation; TLC555CD remains optimal for cost-sensitive commercial use. |
Compared with NE555P and LMC555IMX/NOPB, the TLC555CD offers the best balance of ultra-low power (1mW), commercial-grade reliability, and drop-in compatibility - making it ideal for battery-powered instruments and space-constrained consumer electronics where thermal management and supply headroom are constrained.
Availability
TLC555CD is available at Aetrix Electronics and suitable for precision timing, pulse generation, and time delay generation requiring stable component supply, consistent SOIC-8 packaging, and long-term commercial temperature support.
Supply support for TLC555CD 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 specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in precision timing solutions.
The TLC555 product line was engineered to replace bipolar 555 timers with CMOS efficiency while preserving pin compatibility - targeting low-power, high-accuracy timing in instrumentation, consumer, and industrial control systems.
FAQ
What is the maximum operating frequency of the TLC555CD in astable mode?
The TLC555CD achieves a maximum oscillation frequency of 2.1MHz under specified conditions (RA = 470Ω, RB = 200Ω, CT = 200pF, VDD = 5V, TA = 25°C). This limit arises from propagation delays and internal switch resistance; actual frequency decreases with larger timing components or elevated temperature. For reliable design, TI recommends staying below 1MHz for stable duty cycle control.
Can the TLC555CD replace an NE555 in an existing PCB layout?
Yes, the TLC555CD is functionally and pinout-compatible with the NE555 in SOIC-8 packaging. No PCB changes are required. However, designers must verify that the reduced supply current (350µA vs 6mA) does not affect upstream regulator stability, and confirm that rail-to-rail output swing meets downstream logic thresholds - especially for 3.3V systems.
What is the purpose of the CONT pin on the TLC555CD?
The CONT (Control Voltage) pin on the TLC555CD provides direct access to the internal resistor-divider node, allowing external adjustment of the threshold (≈⅔VDD) and trigger (≈⅓VDD) reference voltages. When bypassed with a 10nF capacitor to GND, it improves noise immunity; when driven with a DC voltage, it enables voltage-controlled timing, PWM, or linear ramp generation.
Does the TLC555CD support single-supply operation below 3V?
Yes, the TLC555CD is fully specified down to 2V supply voltage, with guaranteed operation across 0°C to +70°C. At 2V, it maintains functional timing accuracy, 100mA sink capability (with higher VOL), and sub-1mW power consumption - making it suitable for coin-cell or energy-harvesting applications where ultra-low voltage operation is critical.
How does the discharge transistor performance differ between TLC555CD and NE555?
The TLC555CD's discharge switch exhibits lower on-resistance (typically <1Ω at VDD = 5V, IOL = 10mA) and negligible leakage (<1nA), enabling faster capacitor discharge and improved timing consistency. In contrast, the NE555's bipolar discharge transistor has higher saturation voltage (≈0.2V) and greater leakage, introducing timing errors in low-current, long-interval applications.
TLC555CD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LinCMOS™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- 555 Type, Timer/Oscillator (Single)
- Count:
- -
- Frequency:
- 2.1MHz
- Voltage - Supply:
- 2V ~ 15V
- Current - Supply:
- 360 µA
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
TLC555CD FAQ
1.How can I place an order for TLC555CD through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC555CD 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 TLC555CD reliable?
The price and inventory of TLC555CD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC555CD is usually 5 days.
3.What payment methods are accepted for TLC555CD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC555CD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC555CD?
TLC555CD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC555CD 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 TLC555CD?
For technical support, including TLC555CD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC555CD requirements.
6.How does Aetrix verify that TLC555CD is sourced from the original manufacturer or authorized distributors?
All TLC555CD 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 TLC555CD meets industry standards.
7.What is the process for return or replacement of TLC555CD?
All TLC555CD units undergo pre-shipment inspection (PSI). If there is an issue with TLC555CD, 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 TLC555CD part is unused and in its original packaging.
Return procedure for TLC555CD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC555CD Tags
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