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NXP Semiconductors GTL2018PW,112
- Part No.:
- GTL2018PW,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
GTL2018PW,112.pdf
- Description:
- IC TRANSLATOR BIDIR 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,557
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Product details
Overview
GTL2018PW,112 from NXP Semiconductors is an octal translating transceiver enabling bidirectional level translation between 3.3 V LVTTL systems and GTL−/GTL/GTL+ buses. It functions as either a GTL-to-LVTTL sampling receiver or LVTTL-to-GTL driver, features 5.5 V-tolerant LVTTL inputs, adjustable VREF (0.5 V to 0.5VCC), and operates from 3.0 V to 3.6 V. It is used in high-speed bus interface applications such as CPU-to-cache or chipset-to-memory interconnects.
For engineers reviewing the GTL2018PW,112 datasheet, GTL2018PW,112 pinout, GTL2018PW,112 application, or GTL2018PW,112 equivalent, this page delivers verified electrical parameters, TSSOP24 package mapping, directional control behavior, GTL reference voltage configuration, and real-world interface use cases - all confirmed from NXP's official GTL2018 product data sheet Rev. 2 (2011).
Technical Context
The GTL2018PW,112 implements dual-voltage domain translation using a DIR-controlled bidirectional architecture: when DIR = HIGH, A-side LVTTL signals drive B-side GTL outputs; when DIR = LOW, B-side GTL signals drive A-side LVTTL outputs. Its GTL I/O supports VTT of 0.9 V (GTL−), 1.2 V (GTL), or 1.5 V (GTL+), with corresponding VREF settings of 0.6 V, 0.8 V, or 1.0 V.
Propagation delays are asymmetric: An→Bn paths achieve 2.8–5.0 ns (tPLH/tPHL), while Bn→An paths range from 4.7–8.0 ns depending on GTL variant. Input capacitance is 2.0–2.5 pF (control pins) and 3.4–6.0 pF (I/O ports), supporting high-frequency signal integrity in dense PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0 V to 3.6 V - ensures compatibility with standard 3.3 V LVTTL logic rails and stable operation across industrial temperature range. |
| LVTTL Input Tolerance | Up to 5.5 V - allows direct connection to legacy 5 V TTL or CMOS logic without external level-shifting circuitry. |
| GTL I/O Tolerance | 3.6 V - protects B-side pins against overvoltage during GTL bus termination or transient events. |
| VREF Range | 0.5 V to 0.5VCC - enables precise matching to GTL−/GTL/GTL+ reference requirements via external resistor divider or DAC. |
| Propagation Delay (An→Bn) | 2.8 ns (typ) to 5.0 ns (max) - supports >200 MHz bus timing margins for LVTTL-to-GTL direction in high-performance computing interfaces. |
| Propagation Delay (Bn→An) | 4.7 ns (typ) to 8.0 ns (max) - reflects higher capacitive loading and threshold sensitivity of GTL-to-LVTTL sampling path. |
| ESD Protection | 2000 V HBM / 1000 V CDM - meets robustness requirements for handling and board-level integration in automated manufacturing. |
Pinout & Package
TSSOP24 package (SOT355-1): plastic thin shrink small outline, 24 leads, 4.4 mm body width, 0.65 mm lead pitch, max height 1.1 mm - optimized for high-density routing and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1,7,12,19) | Ground reference | Four dedicated ground pins minimize ground bounce and improve noise immunity across both voltage domains. |
| VCC (14,24) | Positive supply | Dual VCC pins reduce power delivery impedance and stabilize core logic and output drivers under fast switching. |
| DIR (13) | Direction control input | LVTTL-level signal selecting data flow direction: HIGH = A→B (LVTTL→GTL), LOW = B→A (GTL→LVTTL). |
| VREF (6) | GTL reference voltage | Analog input setting GTL receiver threshold; must be externally biased to 0.6 V (GTL−), 0.8 V (GTL), or 1.0 V (GTL+). |
| A0–A7 (15,16,17,18,20,21,22,23) | LVTTL I/O port | Octal bidirectional LVTTL interface; inputs tolerate 5.5 V; outputs drive ±16 mA at 3.3 V. |
| B0–B7 (2,3,4,5,8,9,10,11) | GTL I/O port | Octal GTL-compatible port; operates at VTT = 0.9/1.2/1.5 V; outputs sink up to 80 mA per pin. |
Key Features
| Feature | Design Value |
|---|---|
| Configurable GTL reference | VREF adjustable from 0.5 V to 0.5VCC - enables precise threshold alignment across GTL−, GTL, and GTL+ standards without redesigning bias networks. |
| 5 V-tolerant LVTTL inputs | VI(max) = 5.5 V on A-port - eliminates need for external clamping diodes or resistive dividers when interfacing with mixed-voltage systems. |
| Partial power-down support | Functional retention during selective VCC disable - allows dynamic power gating of unused transceiver sections in low-power system states. |
| Latch-up immunity | >100 mA per JESD78 - guarantees robust operation under transient overvoltage or ESD-induced substrate currents. |
| GTL/GTL−/GTL+ compatibility | Single device supports three GTL variants via VTT/VREF configuration - reduces BOM count and simplifies design reuse across platform generations. |
Applications
| Server Memory Interconnect | Workstation Chipset Interface |
|---|---|
Use Scenario: Bidirectional data transfer between Xeon CPU and L3 cache controller using GTL+ signaling at 1.5 V VTT. IC Role / Device Role / Timing Role: GTL2018PW,112 acts as LVTTL-to-GTL+ translator on address/control lines, synchronizing with clock-domain crossing logic. Use Value: Enables 200+ MHz GTL+ bus operation while maintaining LVTTL-compatible timing margins and eliminating discrete level-shifters. |
Use Scenario: Interface between Intel PCH and high-speed peripheral ASIC using GTL signaling at 1.2 V VTT. IC Role / Device Role / Timing Role: GTL2018PW,112 serves as sampling receiver for GTL status signals, converting to LVTTL for PCH GPIO monitoring. Use Value: Provides sub-5 ns propagation delay and 5.5 V input tolerance, allowing direct connection to legacy 5 V status lines without additional buffering. |
| Industrial Control Backplane | Test Equipment Bus Adapter |
Use Scenario: Isolating and translating control signals between 3.3 V FPGA and GTL− backplane operating at 0.9 V VTT in factory automation PLCs. IC Role / Device Role / Timing Role: GTL2018PW,112 provides direction-controlled signal bridging with VREF set to 0.6 V for GTL− compliance. Use Value: Delivers latch-up immunity >100 mA and ESD protection exceeding 2000 V HBM - critical for field-replaceable module reliability. |
Use Scenario: Adapting test instrument digital I/O to legacy GTL-based DUTs in ATE systems. IC Role / Device Role / Timing Role: GTL2018PW,112 operates in fixed-direction mode (DIR tied HIGH) to drive GTL bus from LVTTL pattern generator outputs. Use Value: Supports 40 mA B-port sink current and 3.6 V GTL I/O tolerance - handles termination resistor loads and bus contention safely. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal LVTTL-to-GTL transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74GTL2018PWR | Texas Instruments variant; identical pinout and function but different VREF min (0.4 V vs 0.5 V); slightly higher ICC (14 mA typ vs 12 mA). | Supports lower VREF down to 0.4 V - suitable for custom GTL variants below GTL− spec; otherwise functionally interchangeable. | Select SN74GTL2018PWR only if sub-0.5 V VREF is required; otherwise GTL2018PW,112 offers tighter ICC and NXP's AEC-Q100 qualified variant (GTL2018PW/Q900). |
| 74ALVC164245DGGR | 16-bit dual-supply translator (1.65–3.6 V A-side, 2.3–3.6 V B-side); no GTL-specific thresholds or VREF pin; higher capacitance (6.5 pF). | General-purpose level shifting only - lacks GTL bus compliance, VTT/VREF configuration, or sampling receiver capability. | Choose 74ALVC164245DGGR for non-GTL multi-voltage logic translation; GTL2018PW,112 remains mandatory for GTL−/GTL/GTL+ bus compliance and sub-5 ns timing. |
Compared with SN74GTL2018PWR and 74ALVC164245DGGR, the GTL2018PW,112 uniquely delivers standardized GTL bus compliance with configurable VREF, guaranteed sub-5 ns LVTTL→GTL propagation, and integrated 5.5 V-tolerant inputs - making it irreplaceable in GTL-based server, workstation, and industrial backplane designs.
Availability
GTL2018PW,112 is available at Aetrix Electronics and suitable for server memory interconnects, workstation chipset interfaces, and industrial control backplanes requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for GTL2018PW,112 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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and communication applications.
The GTL2018PW,112 belongs to NXP's high-speed interface transceiver product line, designed specifically to bridge legacy GTL bus architectures with modern 3.3 V LVTTL logic in performance-critical computing and control systems.
FAQ
What is the maximum allowable VTT voltage for GTL2018PW,112 B-port operation?
The GTL2018PW,112 B-port supports VTT up to 3.6 V per absolute maximum ratings. However, for reliable GTL−/GTL/GTL+ compliance, VTT must be set to 0.9 V (GTL−), 1.2 V (GTL), or 1.5 V (GTL+) with corresponding VREF values. Exceeding recommended VTT may cause timing violations or increased power dissipation without improving functionality.
Can GTL2018PW,112 operate with DIR pin left unconnected?
No - the DIR pin of GTL2018PW,112 must be actively driven HIGH or LOW. Leaving it floating violates Recommended Operating Conditions (Section 9, Note [1]) and risks metastability, unpredictable direction control, and excessive ICC. A pull-up or pull-down resistor (typically 10 kΩ) is required if not driven by logic.
Does GTL2018PW,112 support hot-swap or live-insertion?
GTL2018PW,112 does not include explicit hot-swap circuitry such as slew-rate control or undervoltage lockout. While its 5.5 V-tolerant LVTTL inputs and 3.6 V-tolerant GTL I/O provide some robustness, safe hot-swap requires external current-limiting and sequencing - confirmed by absence of hot-swap specifications in the NXP GTL2018 datasheet Rev. 2.
What is the minimum VREF voltage that ensures reliable GTL2018PW,112 operation?
The GTL2018PW,112 specifies VREF from 0.5 V to 0.5VCC. Operation below 0.5 V is not characterized and may result in incorrect GTL input sampling or increased propagation delay variation. For GTL− compliance, VREF = 0.6 V is required; for GTL, VREF = 0.8 V; for GTL+, VREF = 1.0 V - all above the 0.5 V minimum.
Is GTL2018PW,112 pin-compatible with GTL2000 series devices?
No - GTL2018PW,112 uses a 24-pin TSSOP package with specific pin assignments (e.g., DIR at pin 13, VREF at pin 6). GTL2000-series devices (e.g., GTL2000, GTL2002) use 20-pin SO and TSSOP packages with different pinouts and lack VREF and DIR pins. Direct replacement is not possible without PCB redesign.
GTL2018PW,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- Packaging:
- Tube
- Product Status:
- Obsolete
- Translator Type:
- Mixed Signal
- Channel Type:
- Bidirectional
- Number of Circuits:
- 1
- Channels per Circuit:
- 8
- Voltage - VCCA:
- -
- Voltage - VCCB:
- -
- Input Signal:
- LVTTL
- Output Signal:
- GTL
- Output Type:
- Non-Inverted
- Data Rate:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP (0.173", 4.40mm Width)
GTL2018PW,112 FAQ
1.How can I place an order for GTL2018PW,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for GTL2018PW,112 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 GTL2018PW,112 reliable?
The price and inventory of GTL2018PW,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for GTL2018PW,112 is usually 5 days.
3.What payment methods are accepted for GTL2018PW,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for GTL2018PW,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for GTL2018PW,112?
GTL2018PW,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your GTL2018PW,112 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 GTL2018PW,112?
For technical support, including GTL2018PW,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your GTL2018PW,112 requirements.
6.How does Aetrix verify that GTL2018PW,112 is sourced from the original manufacturer or authorized distributors?
All GTL2018PW,112 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 GTL2018PW,112 meets industry standards.
7.What is the process for return or replacement of GTL2018PW,112?
All GTL2018PW,112 units undergo pre-shipment inspection (PSI). If there is an issue with GTL2018PW,112, 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 GTL2018PW,112 part is unused and in its original packaging.
Return procedure for GTL2018PW,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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