El GTL2014PW de NXP Semiconductors es un transceptor traductor de LVTTL a GTL de 4 bits en un encapsulado TSSOP de 14 patillas (5,0 x 4,4 mm). Funciona con una \u00fanica alimentaci\u00f3n de 3,0 V a 3,6 V con una corriente de alimentaci\u00f3n t\u00edpica de 4 mA. Las entradas del puerto A LVTTL toleran 5,5 V, y las E\/S del puerto B GTL funcionan hasta 3,6 V con salidas de drenaje abierto. Una patilla de direcci\u00f3n (DIR) configura el dispositivo como receptor de muestreo GTL a LVTTL o como controlador LVTTL a GTL. VREF es ajustable de 0,5 V a VCC\/2 para referencia de umbral GTL. El dispositivo admite el apagado parcial y proporciona una protecci\u00f3n ESD superior a 2000 V HBM. El rango de temperatura de funcionamiento es de -40\u00b0C a +85\u00b0C.<\/p>","protected":false},"excerpt":{"rendered":"
The GTL2014PW from NXP Semiconductors is a 4-bit LVTTL-to-GTL translating transceiver in a 14-pin TSSOP package (5.0 x 4.4 mm). It operates from a single 3.0 V to 3.6 V supply with 4 mA typical supply current. The LVTTL A-port inputs are 5.5 V tolerant, and the GTL B-port I\/Os operate up to 3.6 V […]<\/p>\n","protected":false},"author":2,"featured_media":2883,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,20],"tags":[],"chip_brand":[168],"class_list":["post-2052","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-integrated-circuits-ics","category-interface-ics","chip_brand-nxp"],"acf":{"brief_explanation":"4-bit LVTTL-to-GTL transceiver, 3.0-3.6V, 5V-tolerant inputs, adjustable Vref, DIR pin, TSSOP-14, -40~85\u00b0C","date_code":"","package_case":"TSSOP-14 (SOT402-1) (5.0 x 4.4 x 1.1 mm, 0.65mm pitch)","in_stock":3000,"datasheet":"https:\/\/www.nxp.com\/docs\/en\/data-sheet\/GTL2014.pdf","price":"$0.30 (1K+ pcs)","product_introduction":"The GTL2014PW is a 4-bit translating transceiver from NXP designed to interface 3.3-V LVTTL logic with GTL (Gunning Transceiver Logic) buses commonly found in processor and memory controller applications. The device is pin-to-pin backward compatible with the GTL2005, with improved VREF tracking down to 0.5 V for low-voltage CPU interfaces.\n\nGTL is an open-drain signaling standard that uses a reference voltage (VREF) to set the switching threshold. GTL signals swing between 0 V (low) and a termination voltage (VTT), typically 1.2 V or 1.5 V, with VREF at approximately VTT\/2. This lower voltage swing compared to LVTTL enables faster edge rates and lower power dissipation at high frequencies, making GTL popular for processor front-side buses and high-speed memory interfaces.\n\nThe GTL2014 provides 4 bits of bidirectional level translation. When DIR is high, the device translates from LVTTL (A port) to GTL (B port) \u2014 the LVTTL inputs drive the GTL open-drain outputs. When DIR is low, the device translates from GTL (B port) to LVTTL (A port) \u2014 the GTL inputs are sampled against VREF and the results appear on the LVTTL outputs.\n\nThe A-port LVTTL inputs tolerate up to 5.5 V, allowing direct connection to 5-V CMOS or TTL logic. The B-port GTL I\/Os are open-drain and tolerate up to 3.6 V, suitable for both standard GTL (VTT = 1.2 V) and GTL+ (VTT = 1.5 V) buses. The VREF pin accepts a reference voltage from 0.5 V to VCC\/2 (1.8 V max at VCC = 3.6 V), accommodating modern low-voltage processors.\n\nThe GTL2014 is backward compatible with the GTL2005, though the A and B port labels are interchanged between the two devices. Designers migrating from GTL2005 should note this pin swap. The GTL2014's improved VREF linearity below 0.8 V and slightly longer propagation delays distinguish it from the GTL2005.","working_principle":"**GTL Signaling Interface:** GTL uses open-drain drivers with a resistive pull-up to VTT (typically 1.2 V or 1.5 V). The receiver compares the GTL bus voltage against VREF (approximately VTT\/2) to determine the logic level. When the driver pulls the bus below VREF, the receiver detects a low. When the driver releases, the pull-up resistor pulls the bus above VREF, and the receiver detects a high.\n\n**Direction Control (DIR Pin):** When DIR is high, the A-port LVTTL inputs drive the B-port GTL open-drain outputs. A high on an A-port input causes the corresponding B-port output to pull down (assert low on GTL bus); a low on the A-port input releases the B-port output (GTL bus pulled high by external termination). When DIR is low, the B-port GTL inputs are compared against VREF, and the results drive the A-port LVTTL push-pull outputs.\n\n**VREF Reference:** The VREF pin establishes the switching threshold for the GTL receivers. It must be connected to a clean reference voltage, typically derived from VTT through a resistor divider. The GTL2014's VREF tracks accurately down to 0.5 V, supporting low-voltage CPU cores.\n\n**Partial Power-Down:** The I\/O pins are designed to tolerate voltages when VCC is not applied, preventing backflow current damage in hot-swap and power-sequencing scenarios.","pin_description":"
| Pin<\/th> | Name<\/th> | Type<\/th> | Description<\/th><\/tr><\/thead> | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1<\/td> | 1A<\/td> | I\/O<\/td> | LVTTL I\/O bit 0; 5.5V tolerant input; push-pull output when DIR=low (GTL-to-LVTTL)<\/td><\/tr> | ||||||||||||||||||||||
| 2<\/td> | 2A<\/td> | I\/O<\/td> | LVTTL I\/O bit 1; same characteristics as 1A<\/td><\/tr> | ||||||||||||||||||||||
| 3<\/td> | 3A<\/td> | I\/O<\/td> | LVTTL I\/O bit 2<\/td><\/tr> | ||||||||||||||||||||||
| 4<\/td> | 4A<\/td> | I\/O<\/td> | LVTTL I\/O bit 3<\/td><\/tr> | ||||||||||||||||||||||
| 5<\/td> | DIR<\/td> | I<\/td> | Direction control; HIGH = LVTTL-to-GTL (A drives B); LOW = GTL-to-LVTTL (B drives A); do not change while bus is active<\/td><\/tr> | ||||||||||||||||||||||
| 6<\/td> | GND<\/td> | G<\/td> | Ground<\/td><\/tr> | ||||||||||||||||||||||
| 7<\/td> | VREF<\/td> | I<\/td> | GTL reference voltage input; 0.5V to VCC\/2; sets receiver threshold; connect to clean reference derived from VTT<\/td><\/tr> | ||||||||||||||||||||||
| 8<\/td> | 1B<\/td> | I\/O<\/td> | GTL I\/O bit 0; open-drain output; 3.6V tolerant; compared against VREF when receiving<\/td><\/tr> | ||||||||||||||||||||||
| 9<\/td> | 2B<\/td> | I\/O<\/td> | GTL I\/O bit 1<\/td><\/tr> | ||||||||||||||||||||||
| 10<\/td> | 3B<\/td> | I\/O<\/td> | GTL I\/O bit 2<\/td><\/tr> | ||||||||||||||||||||||
| 11<\/td> | 4B<\/td> | I\/O<\/td> | GTL I\/O bit 3<\/td><\/tr> | ||||||||||||||||||||||
| 12-14<\/td> | GND\/NC<\/td> | G\/-<\/td> | Ground \/ no connect<\/td><\/tr><\/tbody><\/table>","application_scenarios":"
|