GTL2018PW,118 - 8-bit LVTTL to GTL Transceiver | NXP | TSSOP-24
MPN: GTL2018PW,118 ✓ Hoạt độngGTL2018PW,118 Tóm tắt
A GTL (Gunning Transceiver Logic) transceiver is a mixed-signal level translator that bridges low-swing, open-drain backplane signaling (approximately 1 V or lower swing, terminated to a GTL reference) with standard CMOS/LVTTL logic rails. Level translators sit in the interface-logic layer of the signal-chain hierarchy, between bus transceivers and voltage supervisors, and are essential wherever processor front-side buses, memory modules, or backplanes use GTL signaling while system logic runs at 3.3 V or 5 V.
Key features include 8 bidirectional translation channels, a direction (DIR) pin that selects GTL-to-LVTTL sampling-receiver mode or LVTTL-to-GTL driving mode, and LVTTL-side inputs tolerant up to 5.5 V, allowing direct connection to TTL or 5 V CMOS sources without external protection. Supply operation is centered on a 3.3 V LVTTL rail, and the operating temperature range spans -40 C to +85 C, qualifying the device for industrial-grade environments.
Technically, the GTL2018 uses an open-drain GTL output stage referenced to a GTL termination voltage, so the GTL bus requires external pull-up resistors to the GTL reference level. The sampling-receiver architecture captures GTL bus state and re-drives it as clean LVTTL, while the DIR pin flips the entire port in one control line - simplifying bus arbitration and turnaround timing on multipoint buses.
Typical applications include server and telecom backplane interfaces, memory-module (GTL DIMM) translation, processor-to-peripheral bus bridging, and industrial control systems where legacy 5 V TTL logic must communicate with GTL-based CPU buses.
Design consideration: budget for the GTL bus pull-up resistors and their current draw, and verify that 3.3 V LVTTL timing margins still hold with the translator propagation delay inserted into the bus path.
This page adds value beyond the manufacturer datasheet by consolidating drop-in alternatives, engineering design notes, and a comparison table in one place.
Bộ thay thế dễ dàng lắp đặt cho GTL2018PW,118 — 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 GTL2018PW,118 (cùng hình factor và footprint) — khác nhau ở Direction Control, Function, LVTTL Input Tolerance, Package Type, Automotive Variant.
GTL2018PW/Q900,118
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
GTL2018PW
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →GTL2018PW,118 Tỷ lệ tối đa & tính chất điện
| Chức năng | 8-bit bidirectional LVTTL-to-GTL translating transceiver |
| Number of Channels | 8 |
| Logic Type | Mixed Signal Translator, Bidirectional |
| Supply Voltage (VCCA) | 3.3 V |
| LVTTL Input Tolerance | 5.5 V (LVTTL inputs only) |
| GTL Bus Compatibility | GTL-, GTL, GTL+ |
| Direction Control | DIR pin (GTL-to-LVTTL receive or LVTTL-to-GTL transmit) |
| Kiểu đầu ra | Open-drain GTL output (external pull-up required) |
| Nhiệt độ hoạt động | -40 C to +85 C |
| Package Type | TSSOP-24 (SOT355-1, MO-153, 4.40 mm body width) |
| Pins | 24 |
| Kiểu lắp đặt | Surface Mount |
| Ordering Suffix Meaning | ,118 = Tape & Reel, Sn/Pb-free reflow-compatible per NXP ordering code |
| Automotive Variant | GTL2018PW/Q900,118 (automotive-grade variant available) |
Hướng dẫn cấu hình chân GTL2018PW,118 tssop-24 (sot355-1, mo-153, 4.40 mm body width)
Cấu hình chân cho GTL2018PW,118 (tssop-24 (sot355-1, mo-153, 4.40 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 GTL2018PW,118.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
GTL2018PW,118 phù hợp cho 6 Áp dụngs: Server and Telecom Backplane Interface, Memory Module (GTL DIMM) Translation, Processor-to-Peripheral Bus Bridging, Industrial Control Systems with Legacy TTL Logic, Automotive Bus Interface Electronics, Test and Measurement / Legacy Bus Emulation.
Server and Telecom Backplane Interface
The GTL2018PW,118 is a natural fit for server and telecom backplanes where processor front-side buses historically used GTL/GTL+ low-swing signaling while shelf management logic runs at 3.3 V LVTTL. Its 8 bidirectional channels translate the terminated, open-drain GTL lines to standard LVTTL with a single DIR control line, letting a backplane controller capture or drive bus state with one GPIO. Because the GTL outputs are open-drain, the bus pull-up network is external, giving designers direct control over edge rate and termination current for long, heavily loaded backplane traces. The -40 C to +85 C operating range covers telecom central-office temperature requirements, and the 24-pin TSSOP (SOT355-1) package keeps the translator compact on dense line-card layouts.
Được đề xuất
Memory Module (GTL DIMM) Translation
GTL-based memory modules and DIMM interfaces use low-swing open-drain signaling that 3.3 V LVTTL host logic cannot read or drive directly. The GTL2018PW,118 bridges this gap with 8 bidirectional channels whose sampling-receiver architecture reconstructs clean LVTTL from the terminated GTL waveform, preserving setup and hold margins on memory control lines. Its 5.5 V-tolerant LVTTL inputs allow connection to legacy 5 V TTL control logic without external clamping diodes, a common requirement when retrofitting memory subsystems into older platforms. Designers should size the GTL pull-up resistors so bus rise time meets the memory timing budget; because the translator adds propagation delay in both directions, verify that the round-trip delay still satisfies the DIMM command timing window before finalizing layout.
Được đề xuất
Processor-to-Peripheral Bus Bridging
When a GTL-signaling processor bus must talk to peripheral boards built with 3.3 V or 5 V TTL/CMOS logic, the GTL2018PW,118 provides the translation layer with its 8 channels mapped one-to-one between the D-side (LVTTL, tolerant to 5.5 V) and the GTL-side ports. The DIR pin enables clean bus turnaround: the peripheral samples the GTL bus in receive mode and drives it in transmit mode under a single control line, which simplifies arbitration state machines. The device's -40 C to +85 C range suits industrial compute and embedded controller environments. Because the GTL side is open-drain, wired-OR behavior on multipoint buses is preserved, and the pull-up network defines both logic-high level and rise time - key parameters to budget when multiple transceivers share one bus segment.
Được đề xuất
Industrial Control Systems with Legacy TTL Logic
Many industrial controllers still contain 5 V TTL I/O cards that must interface with newer GTL-based bus segments. The GTL2018PW,118 is specifically suited here because its LVTTL inputs tolerate up to 5.5 V, permitting direct connection to TTL or 5 V CMOS drivers without level-clamping components, while its 3.3 V core supply matches modern controller rails. The -40 C to +85 C operating range meets typical factory-floor requirements, and the sampling-receiver mode cleans up GTL bus waveforms that would otherwise be marginal at 5 V TTL threshold levels. In practice, engineers place the translator at the boundary between the legacy I/O backplane and the GTL control bus, using DIR to switch between monitoring and commanding the bus segment.
Được đề xuất
Automotive Bus Interface Electronics
For automotive applications that retain GTL-class bus signaling - for example legacy powertrain or chassis controller buses - the GTL2018PW/Q900,118 variant applies NXP's automotive quality flow to the identical 8-bit LVTTL-to-GTL translation function, allowing a single board design to serve both industrial and automotive builds. The translator's 8 channels handle a byte-wide control or data bus between a 3.3 V microcontroller and the terminated GTL segment, with the DIR pin managed by the MCU for direction turnaround. Designers should qualify the open-drain pull-up network against the vehicle's voltage-transient environment and verify the -40 C to +85 C standard range against the target under-hood zone; the /Q900 flow addresses process qualification and traceability requirements demanded by automotive OEMs.
Được đề xuất
Test and Measurement / Legacy Bus Emulation
Bench instruments and bus-emulation fixtures that must inject or monitor GTL signals benefit from the GTL2018PW,118's bidirectional architecture: in sampling-receiver mode it non-destructively captures the terminated GTL bus and re-drives it as clean 3.3 V LVTTL for the instrument's logic analyzer or MCU front end, while in transmit mode it emulates a GTL bus participant from LVTTL stimulus. The 5.5 V-tolerant inputs make the fixture safe against accidental 5 V probe connections. The 24-pin TSSOP package adapts easily to small adapter PCBs between instrument headers and the device under test. Because GTL buses are terminated, the fixture should replicate the production pull-up network so that measured AC behavior matches the real system environment.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho GTL2018PW,118 — 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 | GTL2018PW/Q900,118 | GTL2018PW |
|---|---|---|---|
| Package | TSSOP-24 (SOT355-1) | TSSOP-24 (SOT355-1) - same | TSSOP-24 (SOT355-1) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Channels | 8 bidirectional | 8 bidirectional | 8 bidirectional |
| Logic Function | LVTTL to GTL-/GTL/GTL+ translating transceiver | Identical (same die) | Identical (same die) |
| Supply Voltage | 3.3 V | 3.3 V | 3.3 V |
| LVTTL Input Tolerance | 5.5 V | 5.5 V | 5.5 V |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C (automotive flow) | -40 C to +85 C |
| Quality Flow | Standard industrial | Automotive /Q900 (extended qualification) | Standard industrial |
Bảo phân biệt quan trọng
- Automotive-qualified sibling available on the identical footprint (vsGTL2018PW/Q900,118)
- 5.5 V-tolerant LVTTL inputs eliminate external protection (vsGeneric 3.3 V-only level translators)
- Single-line DIR bus turnaround (vsPer-channel direction-controlled translators)
Ghi chú thiết kế
The GTL2018PW,118's GTL-side outputs are open-drain, so every channel requires an external pull-up resistor to the GTL termination voltage. Estimated: with an example 50-ohm pull-up to a ~1 V GTL reference, each channel sinking low dissipates roughly V^2/R = 1^2/50 = 20 mV*A scale currents (approximately 20 mA per low channel) - with several channels low simultaneously, total sink current and package dissipation must be budgeted. Confirm the exact GTL reference level and resistor values against your specific bus specification and the termination network recommended in the NXP GTL2018 data sheet.
Place a 0.1 uF ceramic decoupling capacitor within 2-3 mm of each supply pin (VCC(A) on the LVTTL side and the GTL-side reference supply) plus one bulk capacitor per device. Keep the GTL-side traces as short as practical and route them away from clock lines; because the bus is terminated and low-swing, impedance discontinuities at vias and stubs degrade rise time. Follow the TSSOP-24 (SOT355-1) footprint per the NXP data sheet and provide solid ground pour under the device to return the GTL sink currents cleanly.
The 5.5 V tolerance applies to the LVTTL-side inputs only - do not apply 5 V to the GTL-side pins, which are referenced to the GTL termination voltage and must be pulled up externally. Ensure DIR is driven to a defined logic level before bus traffic starts; a floating DIR can cause the port to fight the bus. Also verify propagation delay in both directions against your bus timing budget - the sampling-receiver architecture adds delay that must fit within the setup/hold window of the receiving device, per the timing tables in the NXP GTL2018 data sheet.
Thông tin tuân thủ
Compliance status was not stated in the retrieved web data. The standard GTL2018PW,118 is not the automotive flow; the GTL2018PW/Q900,118 variant applies NXP's /Q900 automotive quality process. Verify RoHS/REACH status on the official NXP product page before procurement.
