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Texas Instruments TL7702BCP
- Part No.:
- TL7702BCP
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
TL7702BCP.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,687
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Product details
Overview
TL7702BCP from Texas Instruments is a precision supply-voltage supervisor IC designed as a reset controller for microcomputer systems. It monitors the SENSE input for undervoltage conditions, provides true and complement reset outputs (RESET and RESET), features a 2.53 V ±25 mV temperature-compensated reference voltage, supports 3.6 V to 18 V supply range, and delivers defined reset behavior down to VCC ≥ 1 V - used in industrial control and embedded computing power-up sequencing.
For engineers reviewing the TL7702BCP datasheet, TL7702BCP pinout, TL7702BCP application, or TL7702BCP equivalent, this page delivers verified electrical specifications, functional timing behavior, PDIP-8 package details, real-world reset pulse duration calculation (td ≈ 2.6×10⁴ × CT), and validated alternatives for voltage-monitoring designs requiring stable threshold accuracy and dual active-high/active-low reset signaling.
Technical Context
The TL7702BCP implements a precision bandgap-based voltage reference and dual-comparator architecture to detect SENSE input crossing of a 2.53 V negative-going threshold (VIT–) with 10 mV hysteresis. Its internal timing capacitor (CT) pin controls reset pulse duration via an onboard current source charging a user-selected capacitor, enabling adjustable delay up to seconds-scale.
It operates across 0°C to 70°C ambient, supports open-collector RESET and RESET outputs with ±16 mA drive capability, and includes RESIN override functionality that forces reset state independent of SENSE voltage. The REF output provides a stable 2.53 V reference for external circuitry or calibration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT– Threshold | 2.53 V ±25 mV at 25°C; defines precise undervoltage trip point for system reset initiation |
| Hysteresis (VHYS) | 10 mV; prevents chatter during slow-rising/falling supply transitions |
| Reference Voltage (VREF) | 2.53 V ±50 mV over full temperature range; usable as external precision bias or ADC reference |
| Supply Range (VCC) | 3.6 V to 18 V; enables direct monitoring of 5 V, 12 V, and industrial DC rails without level-shifting |
| Reset Output Drive | ±16 mA at VOH/VOL; sufficient to directly drive microcontroller reset pins or small logic loads |
| Operating Temperature | 0°C to 70°C; qualified for commercial-grade embedded and computing applications |
| Power-Up Reset Activation | Defined from VCC ≥ 1 V; ensures early reset assertion during brown-in conditions |
Pinout & Package
TL7702BCP uses an 8-pin PDIP (Plastic Dual In-line Package) with 9.81 mm × 6.35 mm body size, through-hole mounting, and industry-standard lead pitch (2.54 mm). Designed for prototyping, legacy board replacement, and low-volume industrial assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference voltage output | Provides stable 2.53 V ±50 mV output; requires 0.1 µF bypass capacitor to GND for noise immunity |
| 2 (RESIN) | Reset input control | Active-low override: pulls RESET high and RESET low when asserted, independent of SENSE |
| 3 (CT) | Timing capacitor connection | External capacitor sets reset pulse duration per td ≈ 2.6×10⁴ × CT (e.g., 0.1 µF → ~2.6 ms) |
| 4 (GND) | Ground reference | Primary return path for all internal circuits and output drivers |
| 5 (RESET) | Active-low reset output | Open-collector output; requires external pullup resistor to VCC or logic rail |
| 6 (RESET) | Active-high reset output | Open-collector output; requires external pulldown resistor for clean low-state termination |
| 7 (SENSE) | Supply voltage monitoring input | High-impedance input sensing external rail; triggers reset when voltage falls below 2.53 V threshold |
| 8 (VCC) | Power supply input | Accepts 3.6 V–18 V; powers internal reference, comparators, and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| True and complement reset outputs | Simultaneous active-high (RESET) and active-low (RESET) signals eliminate need for external inverters in mixed-logic systems |
| Externally adjustable pulse duration | CT pin enables precise, capacitor-set reset hold time - critical for ensuring complete processor initialization before release |
| Precision voltage sensor with temp compensation | 2.53 V threshold with ±25 mV variation over 0°C–70°C ensures reliable reset across operating range without calibration |
| RESET output defined from VCC ≥ 1 V | Enables robust power-on reset even during slow-ramp or brown-in events where supply rises gradually |
| Automatic reset after voltage drop | Detects transient undervoltage faults during runtime and asserts reset within nanoseconds of threshold violation |
Applications
| Industrial PLC Control | Embedded Computing Power Sequencing |
|---|---|
Use Scenario: Monitoring 5 V logic rail in programmable logic controller I/O modules subject to EMI-induced voltage sags. IC Role / Device Role / Timing Role: TL7702BCP acts as primary undervoltage detector, asserting RESET to halt CPU execution and prevent corrupted register writes during rail instability. Use Value: 10 mV hysteresis and 2.53 V threshold ensure no false resets from noise spikes while guaranteeing reset activation before logic levels violate MCU specification limits. |
Use Scenario: Coordinating power-up sequence between FPGA, memory, and peripheral controllers on a single-board computer. IC Role / Device Role / Timing Role: TL7702BCP generates synchronized active-high and active-low reset pulses timed by CT capacitor to meet multi-device tRST requirements. Use Value: Adjustable pulse duration (via CT) allows precise tuning to longest device reset-hold time, eliminating need for discrete RC networks or additional timing ICs. |
| Factory Automation HMI Panels | Network Equipment Power Management |
Use Scenario: Ensuring clean boot of ARM-based human-machine interface displays powered from switched 12 V DC supplies. IC Role / Device Role / Timing Role: TL7702BCP supervises 12 V input via resistive divider on SENSE pin and drives both MCU and display controller reset lines simultaneously. Use Value: Dual open-collector outputs enable direct interfacing to 3.3 V and 5 V logic domains using separate pullup/pulldown resistors - no level translators required. |
Use Scenario: Protecting Ethernet switch ASICs from brownout-induced configuration corruption during AC/DC converter transients. IC Role / Device Role / Timing Role: TL7702BCP monitors intermediate 5 V rail and asserts RESET upon detection of >100 ms sag below 2.53 V threshold. Use Value: RESIN pin allows external watchdog IC or FPGA to force emergency reset independently - supporting fail-safe recovery protocols. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G01DBVR | Fixed 1.0 ms reset delay; 0.9 V to 6.0 V supply range; SOT-23-6 package; no REF output | Lacks adjustable timing and reference output; suited for space-constrained, fixed-delay applications only | Select if board area is critical and timing is fixed; not suitable for TL7702BCP's adjustable-delay or REF-dependent designs |
| MAX691CPD+ | 5 V-only operation; built-in watchdog timer; 16-pin PDIP; higher quiescent current (25 µA vs 1.8 mA) | Includes watchdog function but lacks CT-adjustable delay and dual reset outputs; targets legacy 5 V systems | Choose only when watchdog capability is mandatory and 5 V rail supervision suffices; incompatible with 12 V/18 V use cases |
Compared with TPS3808G01DBVR and MAX691CPD+, the TL7702BCP uniquely combines adjustable reset timing, dual complementary outputs, and a buffered reference voltage in a through-hole PDIP package - making it optimal for prototyping, industrial retrofits, and designs requiring flexible, verifiable reset behavior across wide input voltages.
Availability
TL7702BCP is available at Aetrix Electronics and suitable for industrial PLC control, embedded computing power sequencing, factory automation HMI panels, and network equipment power management requiring stable component supply and long-term manufacturability.
Supply support for TL7702BCP 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 delivering analog and embedded processing solutions, with leadership in power management, signal chain, and high-reliability IC design.
The TL77xxB series was developed specifically for robust, precision supply-voltage supervision in microprocessor-based systems - emphasizing threshold accuracy, thermal stability, and flexible reset timing for industrial and computing applications.
FAQ
What is the exact undervoltage threshold voltage of the TL7702BCP?
The TL7702BCP has a nominal negative-going input threshold voltage (VIT–) of 2.53 V at 25°C, with guaranteed min/max bounds of 2.505 V and 2.555 V. Over its full 0°C to 70°C operating range, the threshold remains within 2.48 V to 2.58 V - confirmed by TI's SLVS037O datasheet Section 6.5 Electrical Characteristics.
How do I calculate the reset pulse duration for TL7702BCP using the CT pin?
The reset pulse duration (td) for TL7702BCP is calculated as td ≈ 2.6 × 10⁴ × CT, where CT is the external capacitor value in farads. For example, a 0.1 µF capacitor yields td ≈ 2.6 ms. This relationship is specified in TI's datasheet Section 8.3.2 and validated across process and temperature for the TL7702BCP variant.
Does TL7702BCP support operation below 3.6 V supply voltage?
No - TL7702BCP is characterized for recommended operation only from 3.6 V to 18 V VCC, per Section 6.3 of the datasheet. While RESET output is defined from VCC ≥ 1 V, functional supervision (including accurate threshold detection and REF output regulation) requires minimum 3.6 V. Operation below this violates recommended conditions.
Can TL7702BCP drive a microcontroller reset pin directly without external components?
TL7702BCP's RESET (pin 6) and RESET (pin 5) are open-collector outputs and require external pullup (for RESET) and pulldown (for RESET) resistors - typically 10 kΩ - to establish valid logic levels. Direct connection without termination risks undefined states and failed resets, as explicitly stated in Section 9.2.1 and Figure 11-1 of the datasheet.
What is the purpose of the REF pin on TL7702BCP, and what load can it drive?
The REF pin (pin 1) delivers a precision 2.53 V reference voltage with ±50 mV tolerance over temperature. Per Section 6.5, it is specified at IREF = –500 µA, meaning it can source up to 500 µA while maintaining accuracy. Exceeding this current degrades reference stability and should be avoided in TL7702BCP designs.
TL7702BCP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.53V
- Output:
- Open Drain or Open Collector
- Reset:
- Active High/Active Low
- Reset Timeout:
- 270ns Typical Propagation Delay
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
TL7702BCP FAQ
1.How can I place an order for TL7702BCP through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7702BCP 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 TL7702BCP reliable?
The price and inventory of TL7702BCP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7702BCP is usually 5 days.
3.What payment methods are accepted for TL7702BCP?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL7702BCP?
TL7702BCP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7702BCP 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 TL7702BCP?
For technical support, including TL7702BCP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7702BCP requirements.
6.How does Aetrix verify that TL7702BCP is sourced from the original manufacturer or authorized distributors?
All TL7702BCP 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 TL7702BCP meets industry standards.
7.What is the process for return or replacement of TL7702BCP?
All TL7702BCP units undergo pre-shipment inspection (PSI). If there is an issue with TL7702BCP, 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 TL7702BCP part is unused and in its original packaging.
Return procedure for TL7702BCP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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