GTL2018PW,118 - 8-bit LVTTL to GTL Transceiver | NXP | TSSOP-24
부품 번호: GTL2018PW,118 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
GTL2018PW,118 개요
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.
드롭인 대체품: GTL2018PW,118 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: GTL2018PW,118 (동일 폼 팩터 및 풋프린트) — 차이점: Direction Control, Function, LVTTL Input Tolerance, Package Type, Automotive Variant.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
GTL2018PW/Q900,118
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
GTL2018PW
✅ 드롭인 ⚠️ 사양 미검증✓ 재고 있음
$1.85 / 개
데이터시트 보기 →GTL2018PW,118 최대 정격 & 전기적 특성
| 기능 | 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) |
| 출력 유형 | Open-drain GTL output (external pull-up required) |
| 동작 온도 | -40 C to +85 C |
| Package Type | TSSOP-24 (SOT355-1, MO-153, 4.40 mm body width) |
| Pins | 24 |
| 실장 유형 | 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) |
GTL2018PW,118 tssop-24 (sot355-1, mo-153, 4.40 mm body width) 핀 구성 가이드
GTL2018PW,118(tssop-24 (sot355-1, mo-153, 4.40 mm body width) 패키지)의 핀 구성입니다. 이 디지털 IC에는 GPIO, 통신 인터페이스(UART, SPI, I2C), 전원 핀이 포함되어 있습니다. 대체 핀 기능과 구성 옵션은 제조사 데이터시트를 참조하십시오. 임베디드 시스템 설계와 PCB 레이아웃에 필수적입니다.
다음에 대한 상세 핀아웃 데이터 없음: GTL2018PW,118.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
GTL2018PW,118 적합 용도: 6 애플리케이션s: 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.
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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.
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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.
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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.
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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.
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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.
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추천 제품 요약
엔지니어링 참조 데이터: GTL2018PW,118 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | 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 |
주요 차별점
- Automotive-qualified sibling available on the identical footprint (vs GTL2018PW/Q900,118)
- 5.5 V-tolerant LVTTL inputs eliminate external protection (vs Generic 3.3 V-only level translators)
- Single-line DIR bus turnaround (vs Per-channel direction-controlled translators)
설계 노트
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.
규정 준수 정보
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.
