Логические ИС

GTL2014PW,112

GTL2014PW,112 - 4-Bit LVTTL to GTL Transceiver | NXP

The NXP Semiconductors GTL2014PW,112 is a 4-bit bidirectional LVTTL-to-GTL translating transceiver with a propagation-delay optimized mixed-signal design, 3.3 V LVTTL side interfacing to GTL-/GTL/GTL+ bus reference levels, housed in a 14-pin TSSOP (SOT402-1) package. 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.