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Texas Instruments TL712CDR
- Part No.:
- TL712CDR
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL712CDR.pdf
- Description:
- IC COMPARATOR 1 DIFF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,672
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Product details
Overview
TL712CDR from Texas Instruments is a high-speed bipolar Schottky comparator with differential analog inputs, complementary 3-state TTL-compatible outputs, 5 mV typical hysteresis, 25 ns typical propagation delay, and operation from a single 5-V supply. It serves as a disk memory read-chain data comparator in high-speed digital systems.
For engineers reviewing the TL712CDR datasheet, TL712CDR pinout, TL712CDR application, or TL712CDR equivalent, this page delivers verified electrical specs, SOIC-8 package details, enable-controlled 3-state output behavior, common-mode input range (0 V to 5.5 V), and real-world use cases in data acquisition and memory interface circuits.
Technical Context
The TL712CDR implements self-biased differential inputs with 4 kΩ nominal input resistance and symmetrical switching characteristics. Its complementary outputs (OUT+ and OUT−) drive TTL loads with VOH ≥ 2.7 V and VOL ≤ 0.5 V under specified conditions.
Enable logic (OE) controls output state: OE low places both outputs in high-impedance mode; OE high enables normal comparator operation. The device features 5 mV typical hysteresis to suppress noise-induced oscillation at threshold crossings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75 V to 5.25 V - Ensures stable TTL-level output swing and compatibility with standard 5-V digital logic rails. |
| Propagation Delay | 25 ns typ - Enables reliable sampling of fast data edges in disk read channels and high-speed ADC interfaces. |
| Hysteresis | 5 mV typ - Provides noise immunity for clean decision thresholds in noisy analog environments. |
| Common-Mode Input Range | 0 V to 5.5 V - Allows direct interfacing with unbuffered DAC outputs or sensor signals referenced to system ground. |
| Output Type | Complementary 3-state TTL - Supports wired-OR bus architectures and eliminates contention in shared-data-path designs. |
| Input Resistance | 4 kΩ nominal - Defines loading on preceding stages; critical for gain accuracy in precision comparator configurations. |
| Supply Current | 17–20 mA - Determines power budget impact in multi-comparator systems; consistent across temperature (0°C to 70°C). |
Pinout & Package
TL712CDR is housed in an 8-pin SOIC (D) package per JEDEC MS-012, variation AA, with 1.27 mm pitch, 3.91 mm body width, and 4.90 mm body length. Maximum package height is 1.75 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No internal connection | Unused pad; must remain unconnected to avoid parasitic coupling or mechanical stress. |
| 2 (IN−) | Inverting input | Differential input node; referenced internally to self-bias network; accepts common-mode voltages up to 5.5 V. |
| 3 (IN+) | Non-inverting input | Differential input node; paired with IN− to define threshold crossing point; same common-mode range as IN−. |
| 4 (OE) | Output enable | Active-low control: OE = low → both outputs high-Z; OE = high → comparator active with TTL output drive. |
| 5 (VCC) | Positive supply | Single 5-V rail input; powers internal Schottky logic and output drivers; requires local 0.1 µF bypass. |
| 6 (OUT−) | Inverted output | Complementary TTL output; logic low when IN+ > IN− + hysteresis; drives standard TTL fan-out (10). |
| 7 (OUT+) | Non-inverted output | Complementary TTL output; logic high when IN+ > IN− + hysteresis; matches OUT− timing within 1 ns skew. |
| 8 (GND) | Ground reference | Return path for supply current and output sink/source; must be low-inductance connection to minimize switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Self-biased inputs | Eliminates need for external bias resistors; simplifies PCB layout and reduces component count in level-shifting applications. |
| Complementary 3-state outputs | Enables multiplexed bus architectures without external tri-state buffers; supports hot-swap and dynamic reconfiguration. |
| Single 5-V supply operation | Reduces system power architecture complexity; avoids dual-rail generation and associated noise coupling in mixed-signal boards. |
| 25 ns propagation delay | Supports >30 MHz data rates in read-channel applications; meets timing closure requirements for legacy IDE and floppy controller interfaces. |
| 0 V to 5.5 V common-mode range | Accepts inputs directly from 5-V DACs, op-amp buffers, or unregulated sensors without level-shifting circuitry. |
Applications
| Hard Disk Read Channel | Floppy Disk Controller Interface |
|---|---|
|
Use Scenario: Detecting magnetic flux transitions during disk head readback in legacy storage systems. IC Role / Device Role / Timing Role: High-speed comparator converting analog read signal into clean digital NRZ data stream. Use Value: 25 ns response ensures accurate bit detection at 10–25 Mbps data rates; hysteresis rejects channel noise without post-processing. |
Use Scenario: Converting weak analog signals from floppy disk read heads into TTL-level clock and data signals. IC Role / Device Role / Timing Role: Threshold detector with enable control synchronized to sector timing windows. Use Value: Self-biased inputs eliminate external bias networks; 3-state outputs allow sharing of data bus across multiple drive controllers. |
| High-Speed Data Acquisition | TTL-Level Signal Conditioning |
|
Use Scenario: Digitizing analog waveforms in oscilloscopes or logic analyzers where real-time edge detection is required. IC Role / Device Role / Timing Role: Front-end comparator feeding FPGA or microcontroller capture logic. Use Value: Complementary outputs reduce metastability risk in synchronous sampling; 5 mV hysteresis prevents chatter on slow-rising edges. |
Use Scenario: Converting non-TTL signals (e.g., from CMOS, ECL, or sensor amplifiers) to robust 5-V logic levels. IC Role / Device Role / Timing Role: Level translator and noise filter for inter-IC communication paths. Use Value: 0–5.5 V common-mode range accepts wide input swing; 3-state capability isolates downstream logic during reset or standby. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM311DR | Open-collector output, no built-in hysteresis, wider supply range (5–36 V), slower (115 ns typ). | Requires external pull-up and hysteresis resistors; suited for industrial voltage monitoring, not high-speed data paths. | Select LM311DR only if open-collector flexibility and wide supply tolerance outweigh speed and integration needs. |
| TL3016CDR | Higher speed (4.5 ns typ), rail-to-rail inputs, no 3-state outputs, higher quiescent current (30 mA). | Designed for ultra-fast ADC front-ends; lacks enable control, limiting bus-sharing capability. | Choose TL3016CDR when sub-5 ns response is mandatory and 3-state operation is unnecessary. |
Compared with TL712CDR, LM311DR trades speed and integration for voltage flexibility and cost, while TL3016CDR prioritizes raw speed over output control and power efficiency-making TL712CDR optimal for 5-V, bus-shared, medium-speed comparator roles.
Availability
TL712CDR is available at Aetrix Electronics and suitable for hard disk read channels, floppy disk controller interfaces, high-speed data acquisition systems, and TTL-level signal conditioning requiring stable component supply and long-term production continuity.
Supply support for TL712CDR 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 founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial and automotive reach.
The TL712 series belongs to TI's legacy high-speed comparator product line, designed specifically for reliable, low-latency decision-making in 5-V memory and data interface systems of the 1980s–2000s era.
FAQ
What is the operating temperature range for TL712CDR?
The TL712CDR is rated for operation from 0°C to 70°C ambient temperature. This commercial-grade range aligns with its intended use in desktop computing peripherals and industrial control panels where environmental extremes are limited. The SOIC package's θJA of 97°C/W ensures thermal stability under typical 20 mA supply current loads.
Does TL712CDR require external hysteresis components?
No, TL712CDR integrates 5 mV typical hysteresis internally via its bipolar Schottky design, eliminating the need for external positive feedback resistors. This built-in hysteresis stabilizes switching against noise near threshold crossings-critical in disk read applications where signal integrity directly impacts data recovery reliability.
Can TL712CDR drive standard TTL loads directly?
Yes, TL712CDR provides complementary TTL-compatible outputs: VOH ≥ 2.7 V at −1 mA and VOL ≤ 0.5 V at 16 mA, meeting standard TTL voltage thresholds. Each output can drive up to 10 standard TTL inputs, enabling direct connection to 74LS-series logic without buffer stages.
What is the function of Pin 1 (NC) on TL712CDR?
Pin 1 on TL712CDR is a no-connect (NC) terminal with no internal bond wire or silicon connection. It must remain unconnected in PCB layout to prevent unintended coupling, mechanical stress on the leadframe, or solder bridging. TI's SOIC package drawing explicitly defines it as "NC-No internal connection."
Is TL712CDR pin-compatible with other variants like TL712CP or TL712CPSR?
Yes, all TL712 variants-including TL712CDR, TL712CP, and TL712CPSR-share identical 8-pin functional pinouts per the TI datasheet. Differences lie solely in package type (SOIC vs. PDIP vs. SOP) and packaging format (tape-and-reel vs. tube); electrical behavior and pin assignments are fully interchangeable in circuit design.
TL712CDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Differential
- Number of Elements:
- 1
- Output Type:
- Complementary, Push-Pull, Tri-State, TTL
- Voltage - Supply, Single/Dual (±):
- 4.75V ~ 5.25V
- :
- -
- Voltage - Input Offset (Max):
- -
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 20mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- 25ns
- Propagation Delay (Max):
- 5mV
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
TL712CDR FAQ
1.How can I place an order for TL712CDR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL712CDR 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 TL712CDR reliable?
The price and inventory of TL712CDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL712CDR is usually 5 days.
3.What payment methods are accepted for TL712CDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL712CDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL712CDR?
TL712CDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL712CDR 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 TL712CDR?
For technical support, including TL712CDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL712CDR requirements.
6.How does Aetrix verify that TL712CDR is sourced from the original manufacturer or authorized distributors?
All TL712CDR 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 TL712CDR meets industry standards.
7.What is the process for return or replacement of TL712CDR?
All TL712CDR units undergo pre-shipment inspection (PSI). If there is an issue with TL712CDR, 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 TL712CDR part is unused and in its original packaging.
Return procedure for TL712CDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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