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Texas Instruments TL7700CDGKT
- Part No.:
- TL7700CDGKT
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TL7700CDGKT.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:954
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Product details
Overview
TL7700CDGKT 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%) sense threshold, 1.8 V to 40 V wide supply range, –40°C to 85°C operating temperature, 0.6 mA typical supply current at 40 V, and open-collector RESET output with 5 mA sink capability - deployed in industrial control and notebook power monitoring.
For engineers reviewing the TL7700CDGKT datasheet, TL7700CDGKT pinout, TL7700CDGKT application, or TL7700CDGKT equivalent, key selection considerations include its externally adjustable sense voltage and hysteresis via two resistors, timing capacitor–controlled reset pulse duration, bipolar process stability across automotive-grade voltage/temperature ranges, and VSSOP-8 package compatibility with space-constrained embedded designs.
Technical Context
The TL7700CDGKT integrates a precision 1.5 V temperature-compensated reference, fast comparator, constant-current timing generator (ICT = 15 µA typ), and npn open-collector output driver. Its SENSE input compares external divided voltage against a stable 500 mV internal reference, while CT pin enables programmable reset pulse width (tpo = Ct × 10⁵ s) independent of supply voltage.
Operation relies on bipolar technology for robustness across 1.8–40 V supply rails and –40°C to 85°C ambient. Hysteresis is set by resistor R₁ and sense current Is (2.5 µA typ), enabling stable triggering despite supply ripple - critical for reliable reset assertion in noisy industrial or automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sense Threshold | 500 mV ±1% at 25°C; sets minimum detectable supply voltage via external resistor divider |
| Supply Range | 1.8 V to 40 V; supports direct connection to unregulated 24 V industrial rails or 5 V logic supplies |
| Operating Temp | –40°C to 85°C; qualified for industrial and automotive under-hood applications |
| Supply Current | 0.6 mA typical at VCC = 40 V; enables low-power battery-backed supervision |
| RESET Output | Open-collector NPN; sinks up to 5 mA, requires external pullup for active-low reset signaling |
| Timing Control | CT pin charges at 15 µA typ; defines reset pulse duration (tpo) without external clock or MCU intervention |
| Hysteresis Source | Internal 2.5 µA sense current (±0.5 µA); enables precise hysteresis setting via single resistor R₁ |
Pinout & Package
VSSOP-8 (DGK) package: 3.00 mm × 3.00 mm body, 0.65 mm lead pitch, exposed pad not present, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CT | Timing capacitor interface | Connects to 15 µA constant-current source; sets RESET pulse width (tpo); open-circuit enables comparator mode |
| SENSE | Voltage monitoring input | Compares external divided voltage against 500 mV reference; sets system reset threshold |
| GND | Analog/digital ground | Low-impedance return path for reference, comparator, and output stages; minimizes noise coupling |
| RESET | Reset signal output | Active-low open-collector NPN; requires external pullup; drives MCU/FPGA reset pins directly |
| VCC | Power supply input | Accepts 1.8–40 V; powers all internal blocks including reference, comparator, and timing generator |
| NC | No internal connection | Pins 3, 6, 7 are unused; must be left floating or tied to GND per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable sense voltage | Settable >0.5 V using two external resistors; enables supervision of 3.3 V, 5 V, 12 V, or 24 V rails |
| 1.0% threshold tolerance | Ensures accurate reset assertion across production lots without calibration |
| Programmable hysteresis | Controlled by single resistor R₁ and internal 2.5 µA current; prevents chatter during supply ramp-up/down |
| Wide supply range | Operates from 1.8 V (LDO output) to 40 V (industrial bus); eliminates need for external regulator |
| Low quiescent current | 0.6 mA at 40 V enables direct connection to battery or AC line without burdening supply |
Applications
| Microcontroller Power-On Reset | FPGA Configuration Supervision |
|---|---|
Use Scenario: Ensuring clean startup of ARM Cortex-M or PIC microcontrollers after power rail stabilization. IC Role / Device Role / Timing Role: TL7700CDGKT monitors VDD and asserts active-low RESET until voltage exceeds threshold + hysteresis. Use Value: Prevents code execution before supply reaches valid logic levels, eliminating boot failures in embedded firmware. | Use Scenario: Validating 1.2 V or 2.5 V core supply integrity before FPGA configuration begins. IC Role / Device Role / Timing Role: TL7700CDGKT generates a precise, capacitor-timed reset pulse synchronized to power ramp. Use Value: Guarantees configuration bitstream loads only after stable core voltage, avoiding partial or corrupted config. |
| Industrial PLC Voltage Monitoring | Notebook System Supply Sequencing |
Use Scenario: Detecting brownout on 24 V DC input to programmable logic controllers in factory automation. IC Role / Device Role / Timing Role: TL7700CDGKT senses divided 24 V rail and triggers watchdog or safe-shutdown sequence. Use Value: Enables deterministic response to undervoltage events without MCU involvement, improving functional safety. | Use Scenario: Coordinating reset timing between CPU, GPU, and chipset rails during notebook power-up. IC Role / Device Role / Timing Role: TL7700CDGKT supervises main 5 V or 3.3 V rail and provides synchronized reset to multiple domains. Use Value: Eliminates race conditions between subsystems, ensuring consistent boot state across multi-rail platforms. |
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 process; fixed 1.0 V threshold; 2.9 µA IQ; push-pull output | Lower power but lacks adjustable threshold/hysteresis; requires external components for voltage scaling | Prefer when ultra-low IQ and fixed threshold suffice; avoid if rail-specific sensing or hysteresis tuning needed |
| MAX6326UT29D3+ | ±2.5% threshold accuracy; 1.13 V fixed reset; 1.6 µA IQ; open-drain output | Higher threshold tolerance; no external hysteresis adjustment; smaller SOT-23-3 package | Select for cost-sensitive, space-constrained designs where 1.13 V reset is acceptable and hysteresis is not required |
Compared with TPS3808G01DBVR and MAX6326UT29D3+, the TL7700CDGKT offers superior flexibility in threshold and hysteresis programming, wider supply range (1.8–40 V vs ≤6 V), and bipolar robustness for harsh environments - at the expense of higher quiescent current and larger VSSOP-8 footprint.
Availability
TL7700CDGKT is available at Aetrix Electronics and suitable for industrial control systems, notebook power management, and FPGA configuration supervision requiring stable component supply across extended temperature and voltage ranges.
Supply support for TL7700CDGKT 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 personal electronics markets.
The TL7700CDGKT belongs to TI's legacy bipolar supervisor product line, designed specifically for high-reliability power-on reset generation in systems demanding wide input voltage range, temperature stability, and field-proven robustness without microcontroller dependency.
FAQ
What is the function of the CT pin on the TL7700CDGKT?
The CT pin on the TL7700CDGKT connects to an internal 15 µA constant-current source that charges an external timing capacitor. This charging determines the duration of the RESET output pulse (tpo = Ct × 10⁵ s). When CT is left open, the TL7700CDGKT operates as an adjustable-threshold noninverting comparator. The TL7700CDGKT datasheet specifies that driving CT with external voltage is prohibited due to internal structure limitations.
How is the sense voltage threshold adjusted for the TL7700CDGKT?
The TL7700CDGKT sense voltage threshold (Vs′) is adjusted using two external resistors (R₁ and R₂) forming a voltage divider from the monitored rail to GND, with the junction connected to the SENSE pin. Vs′ = 500 mV × (R₁ + R₂)/R₂. The TL7700CDGKT's internal 500 mV reference and 2.5 µA sense current enable simultaneous threshold and hysteresis (Vhys = Is × R₁) tuning - both confirmed in TI's SLVS220G datasheet Section 8.3.
What package type does the TL7700CDGKT use, and what are its dimensions?
The TL7700CDGKT uses the VSSOP-8 (DGK) package: 3.00 mm × 3.00 mm body size, 0.65 mm lead pitch, 8-pin surface-mount configuration. Per TI's packaging addendum, it has NiPdAu lead finish, MSL Level-1 rating, and is supplied in 250-unit small tape-and-reel format. The TL7700CDGKT's compact footprint supports high-density PCB layouts in space-constrained industrial and portable applications.
Does the TL7700CDGKT require an external pullup resistor on the RESET pin?
Yes, the TL7700CDGKT RESET pin is an npn open-collector output and requires an external pullup resistor to VCC or another logic rail. Typical values range from 2.2 kΩ to 10 kΩ depending on rise time and bus capacitance requirements. Without the pullup, the TL7700CDGKT cannot assert a high state - this is explicitly stated in the Pin Functions table (Section 5) of the TL7700CDGKT datasheet and verified in Figure 21's typical application circuit.
What is the maximum sink current capability of the TL7700CDGKT RESET output?
The TL7700CDGKT RESET output can sink up to 5 mA continuously, as specified in the Absolute Maximum Ratings table (Section 6.1). Under recommended operating conditions, it delivers 3 mA with VOL ≤ 0.8 V at 25°C. This sink capability allows direct interfacing with most microcontroller and FPGA reset inputs without additional buffering - a key design feature confirmed across TI's application notes and electrical characteristics tables for the TL7700CDGKT.
TL7700CDGKT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-VSSOP
TL7700CDGKT FAQ
1.How can I place an order for TL7700CDGKT through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7700CDGKT 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 TL7700CDGKT reliable?
The price and inventory of TL7700CDGKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7700CDGKT is usually 5 days.
3.What payment methods are accepted for TL7700CDGKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7700CDGKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL7700CDGKT?
TL7700CDGKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7700CDGKT 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 TL7700CDGKT?
For technical support, including TL7700CDGKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7700CDGKT requirements.
6.How does Aetrix verify that TL7700CDGKT is sourced from the original manufacturer or authorized distributors?
All TL7700CDGKT 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 TL7700CDGKT meets industry standards.
7.What is the process for return or replacement of TL7700CDGKT?
All TL7700CDGKT units undergo pre-shipment inspection (PSI). If there is an issue with TL7700CDGKT, 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 TL7700CDGKT part is unused and in its original packaging.
Return procedure for TL7700CDGKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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