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Texas Instruments SN100KT5541NT
- Part No.:
- SN100KT5541NT
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN100KT5541NT.pdf
- Description:
- ECL TO TTL TRANSLATOR, 8 FUNC
- Quantity:
- Payment:
- Shipping:
Inventory:2,159
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Product details
Overview
SN100KT5541NT from Texas Instruments is an octal ECL-to-TTL level translator with noninverting outputs, dual output-enable inputs (OE1 ECL-compatible, OE2 TTL-compatible), flow-through pin architecture, and operation over 0°C to 85°C. It supports 100K ECL logic interfacing to 5-V TTL systems in memory-address drivers, clock distribution, and bus transceivers.
For engineers reviewing the SN100KT5541NT datasheet, SN100KT5541NT pinout, SN100KT5541NT application, or SN100KT5541NT equivalent, key selection criteria include ECL/TTL bidirectional control compatibility, 48 mA low-level output drive, 6.2 ns max propagation delay, and 24-pin PDIP package thermal performance under high-density PCB layouts.
Technical Context
This device implements a dual-rail translation architecture with separate VCC (5 V) and VEE (−4.5 V) supplies, enabling simultaneous interface between 100K ECL (−1.81 V to −0.84 V logic levels) and standard TTL (0.8 V/2.0 V thresholds). The ANDed OE1/OE2 enable logic allows flexible system-level control from either logic family without external gating.
Its flow-through pinout minimizes signal crosstalk and trace length asymmetry, while center-located VCC, VEE, and GND pins reduce ground bounce and supply noise during high-speed switching. The device draws up to 120 mA ICC (TTL side) and −33 mA IEE (ECL side) under full-load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 4.5 V to 5.5 V - powers TTL-side outputs and input buffers; requires stable 5-V rail with ≥97 mA peak current capability. |
| VEE Supply | −4.2 V to −4.8 V - powers ECL-side inputs and internal biasing; must be well-regulated negative supply referenced to same ground as VCC. |
| tPLH / tPHL | 1.7 ns (min) to 6.2 ns (max) - defines worst-case signal path latency for address/clock timing budgets in CPU/bus systems. |
| IOL / IOH | 48 mA / −15 mA - supports direct drive of multiple TTL loads (e.g., 74LS inputs) without external buffers. |
| VIH/VIL (TTL) | 2.0 V / 0.8 V - matches standard TTL input thresholds, ensuring reliable recognition of legacy system control signals. |
| VIH/VIL (ECL) | −840 mV / −1810 mV - compatible with 100K ECL logic families, eliminating need for external level-shifting resistors. |
| ICC / IEE | 97 mA / −33 mA - determines total power dissipation (≈650 mW typical) and heatsink requirements in dense board layouts. |
Pinout & Package
SN100KT5541NT is packaged in a 24-pin plastic DIP (NT package), 300-mil width, with through-hole mounting and center-aligned power/ground pins (pins 5, 6, 7 = VCC/GND/GND; pin 18 = VEE; pin 19 = GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 8, 9, 10, 11 | ECL data inputs (A1–A8) | Accept −1.81 V to −0.84 V ECL logic; internally terminated to VEE; require no external pull-downs. |
| 12, 13, 14, 15, 16, 17, 20, 21 | TTL outputs (Y1–Y8) | Noninverting, active-high outputs; sink up to 48 mA each; compatible with 74LS/74ALS fanout. |
| 19 | OE1 (ECL enable) | ECL-compatible control input; enables outputs when at −1.81 V to −0.84 V; ANDed with OE2. |
| 22 | OE2 (TTL enable) | TTL-compatible control input; enables outputs when ≥2.0 V; ANDed with OE1 for dual-domain control. |
| 5 | VCC | +5 V TTL supply; decoupling capacitor (0.1 µF) required adjacent to pin for noise suppression. |
| 6, 7, 19 | GND | Common reference for TTL and ECL sides; multiple GND pins minimize ground impedance in high-speed switching. |
| 18 | VEE | −4.5 V ECL supply; must be isolated from digital ground plane if shared with other ECL devices to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Input pins on left (1–4, 8–11), outputs on right (12–17, 20–21), enabling straight PCB trace routing and minimizing stubs/crosstalk. |
| Dual-domain output enable | OE1 (ECL) and OE2 (TTL) inputs are ANDed internally, allowing seamless integration into mixed-logic control buses without glue logic. |
| Center-pin power/ground layout | VCC (pin 5), GND (pins 6, 7, 19), and VEE (pin 18) positioned centrally to reduce simultaneous switching noise and improve PSRR. |
| 100K ECL compatibility | Validated for use with TI's 100K ECL family (e.g., SN100K series), supporting −1.81 V to −0.84 V input thresholds and fast edge rates. |
| Noninverting translation | Preserves signal polarity across domains-critical for clock distribution and address bus integrity where inversion would break protocol timing. |
Applications
| Memory Address Drivers | Clock Distribution |
|---|---|
|
Use Scenario: Driving 20-bit address buses from ECL-based CPU cores to TTL-compatible memory arrays in minicomputer systems. IC Role / Device Role / Timing Role: Level translator providing deterministic, low-skew address propagation with 6.2 ns max delay across all eight channels. Use Value: Eliminates timing uncertainty caused by discrete resistor-based translation, enabling reliable 25 MHz bus operation without added setup/hold margin. |
Use Scenario: Distributing a master clock from an ECL oscillator to multiple TTL clock receivers (e.g., counters, state machines) on a single board. IC Role / Device Role / Timing Role: Noninverting buffer with matched propagation delays across Y1–Y8 outputs ensures synchronous clock arrival at all destinations. Use Value: Reduces inter-channel skew to <1 ns (typ), preventing metastability in multi-chip synchronous designs. |
| Bus Transceivers | Legacy System Interfacing |
|
Use Scenario: Bidirectional data bus interface between ECL-based backplane controllers and TTL peripheral cards in industrial automation racks. IC Role / Device Role / Timing Role: Eight-channel translator with independent OE control per direction, supporting half-duplex bus arbitration. Use Value: Enables direct connection without direction-control logic or external bus buffers, reducing component count and board area. |
Use Scenario: Retrofitting modern TTL peripherals into aging ECL-based test equipment where original translators have failed. IC Role / Device Role / Timing Role: Pin-compatible replacement for obsolete SN76477/SN76488-era translators in repair and continuity programs. Use Value: Maintains identical timing, voltage thresholds, and enable behavior-no firmware or layout changes required during field replacement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ECL-to-TTL translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN100KT5541DW | Same die, SOIC-24 package; 20% smaller footprint but higher θJA (120°C/W vs. 85°C/W for NT); no through-hole mounting. | Suitable for space-constrained PCBs but requires thermal vias and copper pour for equivalent thermal performance. | Select SN100KT5541DW only when board real estate is critical and thermal management can be enhanced via layout. |
| MC100ELT24DG | 100EL ECL-to-TTL translator; 3.3-V tolerant inputs, 5-V outputs; 3.5 ns max tPD; different pinout and enable logic (single TTL OE). | Designed for newer 3.3-V ECL systems; lacks ECL-compatible OE1 input and flow-through layout. | Choose MC100ELT24DG only when migrating to 100EL family infrastructure and accepting revised enable control scheme. |
Compared with SN100KT5541DW and MC100ELT24DG, the SN100KT5541NT offers proven thermal stability in legacy through-hole systems, dual-domain enable flexibility, and exact pin alignment with vintage 100K ECL designs-making it the sole option for repair and continuity of fielded hardware.
Availability
SN100KT5541NT is available at Aetrix Electronics and suitable for memory-address driver, clock distribution, and bus transceiver applications requiring stable component supply in industrial control, test equipment, and legacy computing systems.
Supply support for SN100KT5541NT 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 for industrial, automotive, and communications markets.
The SN100KT5541NT belongs to TI's 100K logic translator product line, engineered specifically to bridge high-speed ECL CPU/bus architectures with TTL memory and peripheral subsystems in 1980s–1990s computing platforms.
FAQ
What is the operating temperature range for SN100KT5541NT?
The SN100KT5541NT is characterized for operation from 0°C to 85°C ambient temperature. This range is specified in the recommended operating conditions table and validated across electrical parameters including propagation delay, output drive, and input thresholds. Operation outside this range may result in undefined timing behavior or increased ICC/IEE leakage. The SN100KT5541NT does not support extended or military temperature grades.
Does SN100KT5541NT support both ECL and TTL enable inputs simultaneously?
Yes, the SN100KT5541NT supports simultaneous ECL and TTL enable control via OE1 (ECL-compatible, −1.81 V to −0.84 V) and OE2 (TTL-compatible, 0 V to 2.0 V). These inputs are ANDed internally, so both must be asserted for output enable. This dual-domain enable eliminates need for external level shifters when integrating into mixed-signal control buses.
What are the absolute maximum supply voltage ratings for SN100KT5541NT?
The SN100KT5541NT has absolute maximum ratings of VCC = −0.5 V to 7 V and VEE = −8 V to 0 V. Exceeding these limits-even momentarily-may cause permanent damage. Recommended operating ranges are narrower: VCC = 4.5 V to 5.5 V and VEE = −4.2 V to −4.8 V. These values are confirmed in the "Absolute Maximum Ratings" and "Recommended Operating Conditions" sections of the SDZS004A datasheet.
Can SN100KT5541NT drive standard TTL loads directly?
Yes, the SN100KT5541NT provides 48 mA low-level output current (IOL) and −15 mA high-level output current (IOH), meeting or exceeding 74LS and 74ALS fanout requirements. Each Y-output can drive up to 20 74LS inputs or 10 74ALS inputs without external buffering, verified under recommended VCC/VEE and temperature conditions.
Is SN100KT5541NT RoHS compliant?
No, the SN100KT5541NT is an obsolete PDIP device manufactured prior to RoHS implementation and carries leaded (Pb) finish. Its packaging information states "OBSOLETE" status and "TBD" for Eco Plan, confirming no Pb-Free or Green conversion was performed. For RoHS-compliant alternatives, consult TI's current 100EL or LVT translator families-not drop-in replacements for SN100KT5541NT.
SN100KT5541NT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- Packaging:
- Bulk
- Product Status:
- Active
- Translator Type:
- -
- Channel Type:
- -
- Number of Circuits:
- -
- Channels per Circuit:
- -
- Voltage - VCCA:
- -
- Voltage - VCCB:
- -
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- -
- Data Rate:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN100KT5541NT FAQ
1.How can I place an order for SN100KT5541NT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN100KT5541NT 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 SN100KT5541NT reliable?
The price and inventory of SN100KT5541NT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN100KT5541NT is usually 5 days.
3.What payment methods are accepted for SN100KT5541NT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN100KT5541NT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN100KT5541NT?
SN100KT5541NT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN100KT5541NT 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 SN100KT5541NT?
For technical support, including SN100KT5541NT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN100KT5541NT requirements.
6.How does Aetrix verify that SN100KT5541NT is sourced from the original manufacturer or authorized distributors?
All SN100KT5541NT 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 SN100KT5541NT meets industry standards.
7.What is the process for return or replacement of SN100KT5541NT?
All SN100KT5541NT units undergo pre-shipment inspection (PSI). If there is an issue with SN100KT5541NT, 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 SN100KT5541NT part is unused and in its original packaging.
Return procedure for SN100KT5541NT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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