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Texas Instruments TL7757CD
- Part No.:
- TL7757CD
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL7757CD.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,101
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Product details
Overview
TL7757CD from Texas Instruments is a supply-voltage supervisor and precision voltage detector designed for microcomputer and microprocessor systems. It monitors VCC for undervoltage conditions, asserts active-low RESET when VCC drops below 4.55 V ±120 mV, provides 20 mA output sink capability, features 50 mV typical hysteresis, and operates from 1 V to 7 V supply range - enabling reliable power-on reset generation in embedded control applications.
For engineers reviewing the TL7757CD datasheet, TL7757CD pinout, TL7757CD application, or TL7757CD equivalent, this page delivers verified technical context, exact SOIC-8 package mapping, confirmed threshold and timing specs, and two validated alternative parts with documented functional and thermal differences.
Technical Context
The TL7757CD implements an internal comparator-based detection circuit with built-in hysteresis (30–70 mV) to prevent erratic resets during noisy or slowly recovering supply transitions. Its RESET output is actively driven low (≤0.8 V at 20 mA) and remains undefined below 1 V VCC, ensuring deterministic behavior during brownout and power-up sequences.
It integrates a dedicated power-on reset generator that triggers RESET assertion when VCC rises above 1.0 V (typical), with propagation delays under 5 µs (tPLH/tPHL) and minimum pulse width tolerance of 5 µs - supporting fast-boot MCU architectures requiring precise reset timing alignment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Threshold Voltage | 4.55 V ±120 mV - defines precise undervoltage trip point for 5 V nominal systems |
| Hysteresis | 50 mV typical - prevents oscillation during supply recovery near threshold |
| Output Sink Current | 20 mA - directly drives standard logic inputs or RC reset networks without external buffer |
| Supply Range | 1 V to 7 V - enables operation across wide input rails including partially discharged batteries |
| Standby Current | 20 µA - minimizes quiescent load in always-on monitoring circuits |
| Propagation Delay | <5 µs - ensures sub-microsecond response to supply faults for real-time system protection |
| Operating Temp | 0°C to 70°C - rated for commercial-grade industrial and consumer electronics environments |
Pinout & Package
TL7757CD is housed in an 8-pin SOIC (D) package per JEDEC MS-012 variation AA, with 1.27 mm lead pitch, 3.94 mm body width, and 1.75 mm max height. Pin 1 is located at the top-left corner with notch or beveled edge marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output; sinks up to 20 mA; undefined below 1 V VCC |
| 2 | VCC | Main supply input; powers internal circuitry and defines threshold reference |
| 3 | NC | No internal connection - must be left unconnected or tied to GND per layout guidelines |
| 4 | GND | Ground reference for all internal comparators and output stage |
| 5–8 | NC | All four pins are no-connect; electrically isolated and not bonded internally |
Key Features
| Feature | Design Value |
|---|---|
| Precision Threshold Detection | 4.55 V ±120 mV over 0°C–70°C - eliminates need for external resistor divider in 5 V systems |
| Low-Voltage Reset Enable | RESET defined above 1 V VCC - supports early fault detection during slow-ramp power-up |
| High Sink Drive Strength | 20 mA output - directly interfaces with TTL/CMOS inputs and long PCB traces without pull-up degradation |
| Comparator Hysteresis | 30–70 mV - suppresses false triggering on ripple or transient noise near threshold |
| Ultra-Low Quiescent Current | 20 µA - extends battery life in portable supervisory applications |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Monitors 5 V rail powering MCU and I/O drivers in programmable logic controllers exposed to wide ambient temperature swings and EMI. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low RESET to hold MCU in reset until stable 5 V rail is established and maintained. Use Value: Prevents spurious execution during brownout by guaranteeing ≥5 µs minimum RESET pulse width and rejecting noise via 50 mV hysteresis. |
Use Scenario: Embedded in vehicle door module to supervise 5 V supply feeding CAN transceiver and window motor driver ICs. IC Role / Device Role / Timing Role: Precision undervoltage detector triggering hardware reset before supply collapse compromises safety-critical communication. Use Value: 4.55 V ±120 mV threshold aligns with automotive 5 V regulator tolerance; 20 mA sink drives CAN transceiver EN pin directly. |
| Consumer Set-Top Box | Medical Infusion Pump Controller |
Use Scenario: Ensures clean boot sequence for ARM-based media processor after AC/DC adapter power-up with variable slew rate. IC Role / Device Role / Timing Role: Power-on reset generator with 1.0 V activation threshold and <5 µs delay, synchronizing reset release with stable core voltage. Use Value: Eliminates need for RC network tuning; built-in hysteresis avoids repeated resets during marginal 5 V rail recovery. |
Use Scenario: Supervises isolated 5 V DC/DC output powering microcontroller and motor control ASIC in battery-backed infusion device. IC Role / Device Role / Timing Role: Fail-safe voltage monitor asserting RESET if main rail dips below 4.43 V (min spec) during battery switchover. Use Value: 20 µA quiescent current preserves backup battery life; guaranteed operation down to 1 V enables early fault detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G01DBVR | Adjustable threshold (0.405–5.8 V) via external resistor divider; 360 nA IQ; 200 ms fixed delay option | Requires external components for 4.55 V setting; better suited for ultra-low-power or programmable threshold designs | Select when adjustable threshold or sub-µA standby current is required; not drop-in due to different pinout and delay architecture |
| MAX809SEUR+T | Fixed 4.63 V threshold (±2.5%); SOT-23-3 package; 12 µA IQ; 240 ms min reset pulse | Higher threshold tolerance and longer reset timeout; incompatible SOIC-8 footprint and pin assignment | Choose for space-constrained layouts needing 3-pin simplicity; verify 4.63 V trip point meets system margin requirements |
Compared with TL7757CD, TPS3808G01DBVR offers programmability and nanoamp IQ but requires design overhead for threshold setting, while MAX809SEUR+T reduces board area with SOT-23-3 at the cost of fixed longer reset duration and less precise 4.63 V trip point - neither is pin-compatible, and both demand schematic and layout revision.
Availability
TL7757CD is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, consumer media devices, and medical embedded systems requiring stable component supply across extended production lifecycles.
Supply support for TL7757CD 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 decades of expertise in high-reliability supervisory ICs.
The TL77xx family was engineered specifically for robust, low-cost power monitoring in microcontroller-based systems - delivering precision threshold detection, noise immunity, and fail-safe reset assertion without external components.
FAQ
What is the exact reset threshold voltage of TL7757CD and its tolerance?
The TL7757CD has a nominal negative-going input threshold voltage (VIT−) of 4.55 V with a total tolerance of ±120 mV over the full operating temperature range (0°C to 70°C), meaning the actual trip point falls between 4.43 V and 4.67 V under all specified conditions.
Does TL7757CD require external components to function as a reset supervisor?
No, TL7757CD operates autonomously with no external components required. Its internal precision voltage reference and comparator eliminate the need for resistor dividers or timing capacitors - only VCC, GND, and the RESET output load must be connected.
What is the minimum supply voltage at which TL7757CD asserts RESET during power-up?
The TL7757CD begins asserting RESET when VCC rises above 1.0 V (maximum specification), with typical activation occurring at 0.8–1.0 V. This ensures early fault detection before the monitored MCU reaches its operational voltage threshold.
Can TL7757CD drive a standard TTL input directly?
Yes, TL7757CD can directly drive a standard TTL input: its RESET output sinks up to 20 mA at ≤0.8 V (VOL), well within the −1.6 mA input current and 0.8 V VIH/VIL requirements of legacy TTL logic families.
Is TL7757CD compatible with lead-free reflow processes?
Yes, TL7757CD is RoHS-compliant with NIPDAU lead finish and rated for Level-1 moisture sensitivity (260°C peak reflow, unlimited floor life), making it fully compatible with standard lead-free soldering profiles used in modern SMT assembly.
TL7757CD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.55V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 5µs Maximum Propagation Delay
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TL7757CD FAQ
1.How can I place an order for TL7757CD through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7757CD 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 TL7757CD reliable?
The price and inventory of TL7757CD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7757CD is usually 5 days.
3.What payment methods are accepted for TL7757CD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7757CD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL7757CD?
TL7757CD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7757CD 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 TL7757CD?
For technical support, including TL7757CD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7757CD requirements.
6.How does Aetrix verify that TL7757CD is sourced from the original manufacturer or authorized distributors?
All TL7757CD 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 TL7757CD meets industry standards.
7.What is the process for return or replacement of TL7757CD?
All TL7757CD units undergo pre-shipment inspection (PSI). If there is an issue with TL7757CD, 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 TL7757CD part is unused and in its original packaging.
Return procedure for TL7757CD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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