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Texas Instruments TL7700CPW
- Part No.:
- TL7700CPW
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TL7700CPW.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:239
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Product details
Overview
TL7700CPW from Texas Instruments is a bipolar supply-voltage supervisor IC used for power-on reset generation in microcontroller, DSP, and FPGA systems. It features an adjustable 500 mV (±1%) internal sense threshold, 1.8 V to 40 V wide supply range, –40°C to 85°C operating temperature, and open-collector RESET output with 1.5 mA sink capability - enabling reliable reset assertion during brownout or startup in industrial and automotive power rails.
For engineers reviewing the TL7700CPW datasheet, TL7700CPW pinout, TL7700CPW application, or TL7700CPW equivalent, this device supports configurable voltage monitoring via external resistor dividers, programmable hysteresis, and timing-capacitor–controlled reset pulse duration - critical for robust system initialization in embedded control, computing, and power management designs.
Technical Context
The TL7700CPW integrates a precision 1.5 V temperature-compensated reference, fast comparator, constant-current timing generator (ICT = 15 µA typ), and npn open-collector output stage. Its SENSE input compares externally divided rail voltage against a stable 500 mV threshold, while CT pin controls reset pulse width via capacitor charging.
Operation is fully functional across 1.8 V–40 V VCC, with low ICC = 0.6 mA (typ, VCC = 40 V) and guaranteed performance over –40°C to 85°C. The device does not require external clock or biasing - all core functions are self-contained within the monolithic bipolar die.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sense Threshold Voltage | 500 mV ±1% at 25°C - sets precise undervoltage detection point for external resistor divider networks |
| Supply Voltage Range | 1.8 V to 40 V - supports direct monitoring of 3.3 V, 5 V, 12 V, 24 V, and 36 V rails without regulation |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive under-hood environments |
| RESET Output Type | Open-collector npn - requires external pullup; sinks up to 3 mA while holding low during fault condition |
| Timing Capacitor Current | 15 µA typical - linearly charges external CT to set reset pulse duration (tpo = Ct × 10⁵ s) |
| Supply Current (ICC) | 0.6 mA typical at VCC = 40 V - enables battery-backed or energy-constrained supervision |
| Hysteresis Control | Adjustable via R1 resistor (Vhys = Is × R1, Is = 2.5 µA typ) - prevents chatter on noisy supply lines |
Pinout & Package
TSSOP-8 (PW) package, 3.00 mm × 4.40 mm body, 0.65 mm pitch, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CT | Timing capacitor connection | Internal 15 µA current source charges external capacitor to define RESET pulse width; open-circuit enables comparator-only mode |
| 2 - SENSE | Voltage sense input | Compares external resistor-divided rail voltage against 500 mV reference; hysteresis set by series resistor to GND |
| 3, 6, 7 - NC | No internal connection | Unbonded pins; must be left floating or tied to GND per layout best practice - no electrical function |
| 4 - GND | Ground reference | Low-impedance return path for internal reference, comparator, and output stage; critical for noise immunity |
| 5 - VCC | Power supply input | Accepts 1.8 V–40 V unregulated input; powers all internal blocks including reference and output driver |
| 8 - RESET | Reset output | Active-low open-collector npn output; sinks current when SENSE falls below threshold - requires external pullup resistor |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable sense voltage | Settable >0.5 V using two external resistors - enables monitoring of any system rail without dedicated supervisor variants |
| 1.0% sense tolerance | Guaranteed at 25°C - reduces need for calibration and improves system-level voltage margin design |
| Programmable hysteresis | Controlled independently via R1 - eliminates false resets on ripple-prone DC/DC outputs or long PCB traces |
| Wide VCC range | 1.8 V to 40 V operation - supports direct connection to battery, adapter, or industrial bus without LDO pre-regulation |
| Low quiescent current | 0.6 mA typical at full 40 V - extends runtime in always-on supervisory circuits and portable equipment |
Applications
| Industrial PLC Power Monitoring | FPGA Configuration Supervision |
|---|---|
|
Use Scenario: Monitors 24 V DC input to programmable logic controller during cold start and brownout events. IC Role / Device Role / Timing Role: TL7700CPW asserts active-low RESET until 24 V rail stabilizes above 23.2 V (set via resistor divider), holding downstream logic in reset for ≥100 ms. Use Value: Prevents partial configuration or metastability in FPGA fabric by ensuring clean power sequencing before configuration clock enable. |
Use Scenario: Supervises 1.2 V core supply of Xilinx Artix-7 FPGA during power-up and transient dips. IC Role / Device Role / Timing Role: TL7700CPW senses scaled 1.2 V rail via high-precision divider; triggers RESET if voltage drops below 1.14 V for >5 µs. Use Value: Guarantees FPGA reconfiguration only after stable core voltage is achieved - avoids bitstream corruption or I/O latch-up. |
| Automotive Body Control Module | Notebook System Power Sequencing |
|
Use Scenario: Watches 5 V auxiliary rail in BCM that powers CAN transceivers and sensor interfaces. IC Role / Device Role / Timing Role: TL7700CPW uses CT = 100 nF to generate 10 ms RESET pulse, synchronized to ignition-on transition and immune to load-dump transients. Use Value: Ensures deterministic MCU boot after vehicle power-up, even with slow-rising battery-fed supplies and EMI-rich environments. |
Use Scenario: Validates 3.3 V standby rail (3V3_STBY) before enabling main CPU VRM in ultrabook platform. IC Role / Device Role / Timing Role: TL7700CPW monitors 3V3_STBY with 1% threshold accuracy; holds southbridge in reset until rail reaches 3.25 V and remains stable for 200 ms. Use Value: Eliminates race conditions between PMIC sequencing and chipset initialization - critical for UEFI firmware reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supply-voltage supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G01DBVR | CMOS-based, 3.3 V fixed threshold, 1.8–6.0 V supply, 1.6 µA IQ, push-pull output | Lower IQ and smaller footprint, but fixed threshold limits flexibility on non-standard rails | Prefer for low-power 3.3 V systems where adjustable threshold is unnecessary and board space is constrained |
| MAX6816EUT+T | Bipolar, 5 V fixed threshold, 2.7–5.5 V supply, 15 µA IQ, open-collector output, debounced inputs | Includes built-in noise filtering; narrower supply range excludes 12 V/24 V direct monitoring | Choose when monitoring clean 5 V rails with high EMI susceptibility and no need for rail scaling |
Compared with TPS3808G01DBVR and MAX6816EUT+T, the TL7700CPW uniquely supports wide-input (1.8–40 V), adjustable-threshold supervision with user-defined hysteresis - making it the only option among the three suitable for direct 24 V industrial or automotive rail monitoring without external level-shifting.
Availability
TL7700CPW is available at Aetrix Electronics and suitable for industrial control systems, FPGA configuration sequencing, automotive body electronics, and notebook power management requiring stable component supply across extended temperature and voltage ranges.
Supply support for TL7700CPW 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The TL7700CPW belongs to TI's legacy bipolar supervisor product line, designed specifically for robust, wide-range voltage monitoring in cost-sensitive and thermally demanding applications where CMOS alternatives lack sufficient supply headroom or noise immunity.
FAQ
What is the exact sense voltage threshold of the TL7700CPW, and how is it used?
The TL7700CPW has a nominal internal sense threshold of 500 mV ±1% at 25°C. This voltage serves as the reference point for the internal comparator - when the voltage applied to the SENSE pin falls below this value, the RESET output is actively pulled low. Engineers use two external resistors to scale higher system rail voltages (e.g., 5 V, 12 V, 24 V) down to match this 500 mV threshold, enabling flexible undervoltage detection across diverse power domains. The TL7700CPW's precision and temperature stability make it suitable for applications where tight voltage margin control is required.
Can the TL7700CPW operate directly from a 24 V supply without external regulation?
Yes, the TL7700CPW supports a continuous supply voltage range of 1.8 V to 40 V, so it can be powered directly from an unregulated 24 V rail. No external LDO or regulator is needed - the internal bipolar circuitry is designed to function reliably across this full range while maintaining specified accuracy and timing behavior. This capability simplifies power architecture in industrial and automotive systems, reducing component count and improving efficiency. The TL7700CPW's low 0.6 mA typical supply current further enhances suitability for always-on supervision in such applications.
How is reset pulse duration controlled on the TL7700CPW?
Reset pulse duration on the TL7700CPW is set by an external timing capacitor (CT) connected to Pin 1. An internal 15 µA (typ) constant-current source charges CT; when its voltage exceeds the internal comparator threshold, the RESET output transitions high. Pulse width follows tpo ≈ Ct × 10⁵ seconds - e.g., 100 nF yields ~10 ms. Even with CT = 0, minimum propagation delay is ~5–10 µs due to internal switching speed limits. This programmability allows designers to tailor reset hold time precisely to system power-up requirements - a key feature distinguishing the TL7700CPW from fixed-delay supervisors.
Is the TL7700CPW pin-compatible with other packages in the TL7700 family?
No - the TL7700CPW uses the TSSOP-8 (PW) package, which shares the same 8-pin pinout and function mapping as the PDIP (P) and SO (PS) variants per TI's official pin configuration diagrams. However, physical dimensions, thermal characteristics (e.g., RθJA = 172.9°C/W for PW vs. 112.5°C/W for PS), and moisture sensitivity (MSL Level-1 for PW) differ. While electrical functionality and pin assignments are identical across P, PS, and PW packages, PCB layout and thermal management must be validated separately for each package type. The TL7700CPW is not compatible with the VSSOP-8 (DGK) variant, which has different pin numbering.
Does the TL7700CPW require a pullup resistor on the RESET pin?
Yes, the TL7700CPW features an open-collector npn RESET output (Pin 8), which can only sink current - it cannot actively drive high. A pullup resistor to the target logic rail (e.g., 3.3 V or 5 V) is mandatory to ensure a defined HIGH state when the output transistor is off. Typical values range from 4.7 kΩ to 10 kΩ, selected based on rise time requirements and bus loading. Without this pullup, the RESET signal floats undefined, risking improper system initialization. This requirement is inherent to the TL7700CPW's output architecture and applies identically across all TL7700 package variants.
TL7700CPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 10µs Maximum Propagation Delay
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
TL7700CPW FAQ
1.How can I place an order for TL7700CPW through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7700CPW 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 TL7700CPW reliable?
The price and inventory of TL7700CPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7700CPW is usually 5 days.
3.What payment methods are accepted for TL7700CPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7700CPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL7700CPW?
TL7700CPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7700CPW 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 TL7700CPW?
For technical support, including TL7700CPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7700CPW requirements.
6.How does Aetrix verify that TL7700CPW is sourced from the original manufacturer or authorized distributors?
All TL7700CPW 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 TL7700CPW meets industry standards.
7.What is the process for return or replacement of TL7700CPW?
All TL7700CPW units undergo pre-shipment inspection (PSI). If there is an issue with TL7700CPW, 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 TL7700CPW part is unused and in its original packaging.
Return procedure for TL7700CPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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