GTL2014PW,112 - 4-Bit LVTTL to GTL Transceiver | NXP
MPN: GTL2014PW,112 ✓ Hoạt độngGTL2014PW,112 Tóm tắt
A voltage level translator is a mixed-signal interface IC that allows logic blocks operating at different supply domains to exchange signals safely. Within the signal-chain hierarchy, translators sit between bus transceivers and buffers, forming part of the broader family of interface and logic ICs. GTL (Gunning Transceiver Logic) is a low-swing open-drain bus standard historically used for processor front-side buses and memory interfaces, where the bus voltage is defined relative to a reference voltage (Vref) such as 1.0 V or lower, while the system side typically runs at 3.3 V LVTTL.
Key features of the GTL2014 include its 4-bit bidirectional architecture with a single direction (DIR) control pin, allowing the device to act either as a GTL-to-LVTTL sampling receiver or as an LVTTL-to-GTL interface. The GTL-side threshold tracks the Vref pin, which supports GTL-, GTL, and GTL+ bus variants; according to the NXP datasheet, Vref tracks linearly down to 0.5 V for low-voltage CPU applications, a wider usable tracking range than the related GTL2005.
Technically, the device is fabricated in a BiCMOS process, combining bipolar drive capability for the low-impedance GTL bus with CMOS low static power on the LVTTL side. The GTL side uses open-drain outputs pulled up to VTT through bus termination resistors, so the translator dissipates termination power in the resistors rather than in the IC. Input/output capacitance on the B port is on the order of 3.4 pF to 4.3 pF per the datasheet, keeping bus loading low.
Typical applications include processor-to-memory bus translation in legacy server and networking platforms, backplane control lines bridging a 3.3 V microcontroller or FPGA to a GTL signaling bus, and mixed-voltage board-level upgrades of GTL-based systems. The four-bit width matches byte-strobe or chip-select groupings.
A key design consideration is that the GTL2014 is pin-to-pin backward compatible with the GTL2005, but the A-port and B-port labels are interchanged; propagation delays are slightly longer in exchange for better Vref linearity below 0.8 V, so drop-in migration from GTL2005 requires re-checking timing margin.
This page synthesizes verified distributor listings, the NXP product page, drop-in compatibility analysis, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho GTL2014PW,112 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với GTL2014PW,112 (cùng hình factor và footprint) — khác nhau ở Direction Control, Function, Number of Channels, Package, RoHS Status.
GTL2005PW,112
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
GTL2014PW,112 Tỷ lệ tối đa & tính chất điện
| Chức năng | 4-bit bidirectional LVTTL to GTL translating transceiver |
| Logic Family | GTL (BiCMOS technology) |
| Logic Type | BiCMOS |
| Number of Channels | 4 |
| Circuits per Channel | 1 |
| Input Level (A-side) | 3.3 V LVTTL |
| Output Level (B-side) | GTL-/GTL/GTL+ (Vref-referenced, tracks to 0.5 V) |
| Vref Tracking Range | Down to 0.5 V (linear tracking) |
| Direction Control | Yes (DIR pin) |
| B-port Input/Output Capacitance | 3.4 pF to 4.3 pF |
| Khoảng nhiệt độ hoạt động | -40C to +85C |
| Hộp | TSSOP-14 (SOT402-1), 4.4 mm body width |
| Kiểu lắp đặt | Surface Mount |
| Topside Mark | GTL2014 |
| Compatibility | Pin-to-pin backward compatible to GTL2005 (A/B port labels interchanged) |
| Trạng thái RoHS | Compliant (,112 suffix = RoHS-compliant ordering code) |
Hướng dẫn cấu hình chân GTL2014PW,112 tssop-14 (sot402-1), 4.4 mm body width
Cấu hình chân cho GTL2014PW,112 (tssop-14 (sot402-1), 4.4 mm body width gói). IC số này bao gồm chân GPIO, giao diện truyền thông (UART, SPI, I2C) và chân nguồn. Tham khảo tài liệu thông số kỹ thuật của nhà sản xuất để biết các chức năng chân thay thế và tùy chọn cấu hình. Cực kỳ quan trọng cho thiết kế hệ thống tích hợp và lập trình PCB.
Không có dữ liệu chân cụ thể sẵn có cho GTL2014PW,112.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
GTL2014PW,112 phù hợp cho 6 Áp dụngs: CPU Front-Side Bus Translation, Legacy Server and Networking Backplanes, Mixed-Voltage Board Upgrades, Test and Measurement Fixtures, Industrial Control Signal Bridging, Memory Subsystem Interface Translation.
CPU Front-Side Bus Translation
The GTL2014 was designed specifically for translating between a 3.3 V LVTTL system domain and GTL-/GTL/GTL+ processor buses. Its Vref-referenced GTL thresholds track linearly down to 0.5 V, which the NXP datasheet explicitly targets at low-voltage CPU applications where other translators lose threshold accuracy. In a typical platform, the four channels carry address strobes or control lines between a processor's low-swing GTL bus and 3.3 V support logic. The direction pin lets one device serve both read (GTL-to-LVTTL sampling receiver) and write (LVTTL-to-GTL) phases. With only 3.4 pF to 4.3 pF of B-port capacitance, added bus loading is minimal, preserving signal integrity on terminated GTL nets.
Được đề xuất
Legacy Server and Networking Backplanes
Server memory interfaces and networking backplanes from the GTL era use low-swing open-drain signaling referenced to VTT/Vref, while their management and control logic runs at 3.3 V LVTTL. The GTL2014 bridges these domains bidirectionally in a compact TSSOP-14 footprint, one device per four lines. Because the GTL side is open-drain, backplane termination resistors set the high level and the translator sinks current low - termination power is dissipated in resistors, not in the IC, simplifying board thermal design in dense chassis. The -40C to +85C operating range covers telecom rack environments. Designers sustaining these platforms should verify Vref value and timing margin, since the GTL2014's propagation delay is slightly longer than the GTL2005's.
Được đề xuất
Mixed-Voltage Board Upgrades
When retrofitting a modern 3.3 V FPGA or microcontroller into an existing GTL-signaled system, the GTL2014 provides a low-risk glue interface: four bidirectional channels in one TSSOP-14 that requires no firmware changes and no bus redesign. The Vref pin simply connects to the existing bus reference, and the thresholds follow it across GTL-, GTL, and GTL+ variants, so a single part number covers multiple bus generations. Because it is active production and RoHS compliant (,112 suffix), it fits lead-free rework processes used in board upgrades. Engineers should map A/B port direction labels carefully against the legacy schematic - particularly if the board was originally designed around the GTL2005, whose A and B labels are interchanged relative to the GTL2014.
Được đề xuất
Test and Measurement Fixtures
Bench and production test fixtures that exercise GTL-based boards need a safe translation layer between 3.3 V test electronics and the DUT's low-swing GTL nets. The GTL2014 fits this role: its sampling-receiver mode presents a clean LVTTL representation of GTL bus activity to a logic analyzer or MCU, while its driver mode injects LVTTL-originated patterns onto the terminated GTL bus. The four-channel width matches common chip-select/byte-enable groupings, and the direction pin can be driven per test phase. Since B-port capacitance is only 3.4 pF to 4.3 pF, fixture loading stays predictable. Keep fixture Vref routing quiet and locally decoupled so threshold tracking remains accurate across all channels.
Được đề xuất
Industrial Control Signal Bridging
Industrial controllers built around 3.3 V MCUs or FPGAs occasionally must talk to GTL-level signals inherited from processor-module designs. The GTL2014 offers a simple, robust bridge: BiCMOS construction gives solid current sink on the open-drain GTL side for reliable switching through backplane termination, while the LVTTL side connects directly to standard logic. The -40C to +85C temperature range suits factory-floor enclosures. Designers should budget for the resistor-termination dissipation on the GTL side and keep trace stubs short, since GTL's low swing (~1 V referenced to Vref) leaves little noise margin on long lines. For new industrial designs, consider modern dual-supply translators unless GTL compatibility is mandatory.
Được đề xuất
Memory Subsystem Interface Translation
GTL signaling historically appeared on memory control and data paths in workstation and server platforms. The GTL2014's four-bit width and bidirectional capability make it suitable for translating memory control groups (chip selects, output enables, masks) between a 3.3 V memory controller and GTL-referenced memory modules. The Vref input accepts the memory bus reference directly and tracks down to 0.5 V, accommodating reduced-swing memory variants. The sampling-receiver mode latches GTL bus state cleanly into the LVTTL domain without external level comparators. When migrating a design from GTL2005 to GTL2014 for better low-Vref accuracy, remember the A/B port label interchange and re-verify setup/hold timing against the slightly longer propagation delay.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho GTL2014PW,112 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | GTL2005PW,112 |
|---|---|---|
| Package | TSSOP-14 (SOT402-1) | TSSOP-14 (SOT402-1) - same |
| Brand | NXP Semiconductors | NXP Semiconductors |
| Bit Width | 4-bit bidirectional | 4-bit bidirectional |
| Vref Tracking | Linear down to 0.5 V | Linearity degrades below 0.8 V |
| Propagation Delay | Slightly longer (per datasheet) | Shorter |
| Port Labeling | A = LVTTL, B = GTL | A/B labels interchanged vs GTL2014 |
| Supported Bus Levels | GTL-/GTL/GTL+ | GTL-/GTL/GTL+ |
| Lifecycle Status | Active | Active |
Bảo phân biệt quan trọng
- Vref tracks linearly down to 0.5 V (vsGTL2005PW,112)
- Pin-compatible migration path exists (vsGTL2005PW,112)
- Trade-off: slower than GTL2005 (vsGTL2005PW,112)
Ghi chú thiết kế
The GTL side of the GTL2014 uses open-drain outputs with a low logic swing referenced to Vref (supporting GTL-, GTL, and GTL+ threshold families). Keep GTL-side traces short and impedance-controlled, and verify that every net has its termination pull-up to VTT sized for the bus load. With only 3.4 pF to 4.3 pF of B-port capacitance per the datasheet, the translator itself adds little loading, but stub length and connector discontinuities dominate at GTL edge rates. Simulate setup/hold margin, especially if migrating from the faster GTL2005.
Route the Vref pin as a quiet reference: connect it to the GTL bus reference at a single low-impedance point and decouple it locally (e.g., 100 nF) to ground. Vref accuracy directly sets the GTL input threshold, and the GTL2014 is chosen precisely for linear tracking down to 0.5 V, so noise on this pin erodes the noise margin of all four channels simultaneously. Place the device close to the bus connector, keep A-side (3.3 V LVTTL) traces on a clean digital layer, and provide standard 100 nF decoupling on VCC.
The most common migration error is the A/B port label interchange between the GTL2014 and the pin-compatible GTL2005 documented in the NXP datasheet: a schematic ported from a GTL2005 design must have its direction logic and port naming re-checked, or the transceiver will drive the wrong domain. Also remember the trade-off - the GTL2014's slightly longer propagation delays buy better Vref linearity below 0.8 V; re-verify timing if Vref is above 0.8 V where the GTL2005 is faster.
Estimated: GTL translator ICs such as the GTL2014 dissipate very little power internally because GTL termination power is dropped in the external pull-up resistors, not the IC. For example, four channels sinking through 50-ohm terminations from a 1.2-1.5 V VTT put roughly 30-45 mW per channel into the resistors. The TSSOP-14 package handles this without heatsinking; verify the resistor power rating, not the IC's thermal budget.
Thông tin tuân thủ
The ,112 ordering suffix denotes the RoHS-compliant, lead-free version per NXP ordering conventions and distributor listings (Mastercomponent, Jotrin).
