GTL2012DP,118 - 2-Bit LVTTL-to-GTL Transceiver | NXP Semiconductors
MPN： GTL2012DP,118 ✓ 啟用中GTL2012DP,118 概覽
A GTL (Gunning Transceiver Logic) translator is a mixed-signal level-shifting device that bridges a low-swing backplane bus such as GTL- (approximately 0.4 V to 1.2 V swing) with a standard logic rail such as 3.3 V LVTTL. Within the signal-chain hierarchy, the GTL2012 belongs to the logic IC family, specifically the voltage-level translator / bus transceiver category, sitting between a processor or memory controller and a GTL backplane.
Key features of the GTL2012 include a direction (DIR) control pin that configures the device either as a GTL-to-LVTTL sampling receiver or as an LVTTL-to-GTL driver, LVTTL-side inputs tolerant up to 5.5 V for direct connection to TTL or 5 V CMOS logic, and a compact 2-channel width suited to narrow point-to-point links. According to the NXP datasheet, the supply range is 3 V to 3.6 V with a maximum supply current of 10 mA.
Technically, the two channels translate open-drain GTL signals referenced to a GTL termination rail into full-swing LVTTL levels, and vice versa. The open-drain GTL outputs require pull-up resistors to the GTL reference supply, a typical arrangement in Gunning Transceiver Logic backplanes. Because the LVTTL inputs alone are 5.5 V tolerant, legacy 5 V TTL signals can be received without additional protection circuitry.
Typical applications include processor-to-backplane bus interfacing in telecom and industrial systems, memory subsystem translation where a GTL bus meets a 3.3 V controller, and mixed-voltage board-level bridges in legacy equipment maintenance.
Design consideration: always provide adequate GTL pull-up termination and verify that the DIR pin is driven to a valid logic level before bus traffic begins, since an undefined direction state can cause bus contention.
This page adds value beyond the manufacturer datasheet by synthesizing distributor sourcing information, drop-in alternative analysis, FAQ coverage of replacement intent, and practical design notes for the GTL2012DP,118.
直接替換替代品，適用於 GTL2012DP,118 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
PCA9306DTR2G
✅ 直接替換📋 參考替代品（不在目錄中）
GTL2012DP,118 最大額定值與電氣特性
| 功能 | 2-bit LVTTL to GTL translating transceiver |
| Number of Channels | 2 |
| Translation Type | Mixed Signal Translator, Bidirectional |
| 供應電壓 | 3.3 V (range 3 V to 3.6 V) |
| Maximum Supply Current | 10 mA |
| Input Type | LVTTL (5.5 V tolerant on LVTTL inputs) |
| Bus Interface | GTL- / GTL / GTL+ |
| Direction Control | DIR pin (GTL-to-LVTTL receiver or LVTTL-to-GTL driver) |
| 工作溫度 | -40 C to +85 C |
| Package Type | TSSOP-8 / VSSOP-8 (SOT765-1, MO-187, 2.30 mm body) |
| 腳位數 | 8 |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
| Circuit Configuration | 1 circuit, 2 channel |
| Manufacturer | NXP Semiconductors |
| Ordering Suffix | ,118 (standard pack, RoHS compliant) |
| 輸出類型 | Open-drain GTL side (requires pull-up termination) |
GTL2012DP,118 tssop-8 / vssop-8 (sot765-1, mo-187, 2.30 mm body) 腳位配置指南
GTL2012DP,118（tssop-8 / vssop-8 (sot765-1, mo-187, 2.30 mm body) 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： GTL2012DP,118.
請參閱 資料表 以查看完整腳位配置。
典型應用
GTL2012DP,118 適用於 6 應用s: Processor-to-GTL Backplane Interfacing, Memory Subsystem Level Translation, Telecom Shelf and Line-Card Control Links, Industrial Automation Legacy Bus Bridges, 5 V TTL to GTL Mixed-Signal Front Ends, Test, Measurement, and Protocol Adapter Boards.
Processor-to-GTL Backplane Interfacing
The GTL2012DP,118 is purpose-built for bridging a 3.3 V LVTTL processor or controller to a GTL-, GTL, or GTL+ backplane bus. Its 2-bit width matches narrow point-to-point control or status links, while the DIR pin lets firmware select GTL-to-LVTTL receive or LVTTL-to-GTL transmit direction at runtime. With LVTTL inputs tolerant up to 5.5 V, the part also accepts direct TTL and 5 V CMOS control signals in mixed-generation systems. Open-drain GTL outputs with external pull-up termination preserve the low-swing backplane signaling standard, and the 3 V to 3.6 V supply with 10 mA maximum current keeps power overhead negligible. In telecom shelf controllers and industrial backplane cards, this translator lets modern 3.3 V silicon communicate over legacy Gunning Transceiver Logic wiring without redesigning the backplane.
推薦
Memory Subsystem Level Translation
Legacy memory and control ASICs frequently expose GTL-compatible command or address lines while surrounding glue logic runs at 3.3 V LVTTL. The GTL2012DP,118 translates two of these lines bidirectionally, using its DIR pin to switch between sampling GTL bus state into an LVTTL receiver and driving GTL lines from LVTTL logic. The 5.5 V tolerant LVTTL inputs allow direct connection to older 5 V TTL controllers without clamping diodes. Because the device draws at most 10 mA from a 3 V to 3.6 V rail and operates from -40 C to +85 C, it fits both server chassis and industrial storage controllers. Designers should route GTL traces as controlled-impedance lines and place pull-up termination resistors close to the bus end to preserve signal integrity at backplane speeds.
推薦
Telecom Shelf and Line-Card Control Links
Telecom equipment such as shelf managers, line cards, and maintenance controllers often retain GTL-signaled status or arbitration lines inherited from earlier backplane generations. The GTL2012DP,118 provides the exact translation function needed: GTT low-swing open-drain signaling on one side, 3.3 V LVTTL on the other, with direction control via DIR. Its industrial temperature rating of -40 C to +85 C suits outdoor cabinets and uncooled racks, and the 8-pin SOT765-1 TSSOP package occupies minimal line-card area. The 5.5 V tolerant LVTTL inputs directly accept 5 V TTL alarm signals common in legacy frames. Using a dedicated GTL translator instead of a generic I2C switch preserves correct GTL logic thresholds and termination behavior, reducing bring-up risk in mixed-voltage telecom hardware.
推薦
Industrial Automation Legacy Bus Bridges
Factory automation retrofits must often connect new 3.3 V microcontrollers to existing GTL-based backplanes, PLC backbones, or sensor arbitration buses. The GTL2012DP,118 performs this bridge with a 3 V to 3.6 V supply, 10 mA maximum current draw, and -40 C to +85 C operation covering plant-floor temperature extremes. The DIR pin enables dynamic direction switching under MCU control, useful for half-duplex poll-response protocols. Because the LVTTL inputs tolerate up to 5.5 V, the translator can also accept 5 V TTL signals from retained legacy I/O modules. Engineers should verify GTL pull-up termination against bus capacitance and cable length, as the open-drain GTL side depends on external pull-ups for high-level restoration. The 8-pin TSSOP package simplifies drop-in inclusion in retrofit adapter boards.
推薦
5 V TTL to GTL Mixed-Signal Front Ends
Systems combining older 5 V TTL logic with GTL buses benefit directly from the GTL2012DP,118 because, per NXP, its LVTTL inputs are tolerant up to 5.5 V and allow direct access to TTL or 5 V CMOS outputs. A 5 V TTL controller can therefore drive the translator inputs without series protection, while the GTL side communicates with the low-swing bus at GTL- or GTL+ levels. The 3.3 V supply rail remains within the specified 3 V to 3.6 V window even in mixed-rail systems. Typical uses include test fixtures, instrument interfaces, and maintenance adapters that must interoperate with several equipment generations. Care should be taken that only inputs see 5 V signals; GTT-side pins must remain within their GTL termination-referenced ratings to avoid overvoltage damage.
推薦
Test, Measurement, and Protocol Adapter Boards
Bench adapters, bus analyzers, and emulator pods targeting GTT/GTL+ equipment need compact, bidirectional translation between a host's 3.3 V USB or MCU interface and the target's GTT lines. The GTL2012DP,118 supplies exactly two translated channels in an 8-pin SOT765-1 TSSOP, ideal for probe pods where board area is scarce. The DIR pin lets the host firmware reconfigure the channel direction on the fly when a capture/inject boundary is crossed, and the low 10 mA supply current suits bus-powered USB instruments. Its -40 C to +85 C range permits use in environmental test chambers. Designers should add series resistors and ensure GTT pull-up termination values match the target system so the pod presents a bus-compatible load rather than altering bus timing.
推薦
推薦產品摘要
工程參考資料，適用於 GTL2012DP,118 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | PCA9306DTR2G |
|---|---|---|
| Package | TSSOP-8 / VSSOP-8 (SOT765-1) | TSSOP-8 - same footprint |
| Brand | NXP Semiconductors | onsemi |
| Function | 2-bit LVTTL-to-GTL translating transceiver | Dual bidirectional I2C/SMBus voltage translator |
| Supply Voltage | 3 V to 3.6 V | 1.0 V to 3.6 V pass-switch (dual rail) |
| Direction Control | DIR pin (receiver/driver select) | EN/OE bias pin, auto-direction on open-drain bus |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C |
| Target Bus Standard | GTL- / GTL / GTL+ | I2C / SMBus / open-drain buses |
主要差異化特點
- Native GTL/GTL+/GTL- standard support (對比PCA9306DTR2G)
- 5.5 V tolerant LVTTL inputs (對比PCA9306DTR2G)
- Explicit direction control (DIR pin) (對比PCA9306DTR2G)
設計說明
GTL signaling is open-drain on the bus side: the GTL2012 can only pull the bus low, and external pull-up resistors to the GTT termination supply restore the high level. Omitting or undersizing the pull-ups results in stuck-high or undefined bus states. Verify that the DIR pin is driven to a valid logic level before bus traffic begins; an undefined direction state can cause bus contention between the translator and other GTL drivers on the network.
Keep GTL traces short and treat them as controlled-impedance lines where backplane speeds are involved. Place the GTT pull-up termination resistors close to the bus end rather than at the translator, and place the GTL2012DP,118 decoupling capacitor (100 nF ceramic) within a few millimeters of the VCC pin. The 8-pin SOT765-1 footprint has fine 0.65 mm pitch - confirm land pattern per the datasheet before PCB fabrication.
The device draws a maximum of 10 mA from a 3 V to 3.6 V rail, so thermal design is trivial (Estimated: worst case 3.6 V x 10 mA = 36 mW, far below any package thermal limit). The critical power consideration is instead the GTT termination network: pull-up resistors dissipate power whenever the bus is driven low, so size them for continuous worst-case current, not just translator idle current.
合規資訊
RoHS compliance explicitly listed as a feature in distributor datasheet summaries; the ,118 suffix denotes NXP standard RoHS-compliant packing. Not an automotive AEC-Q100 part. REACH/halogen-free/conflict-minerals declarations should be verified on the current NXP compliance portal.
