View MAX14984ETG_5415060.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

????????????????????????????????????????????????????????????????? maxim integrated products 1 typical operating circuit 19-6229; rev 0; 3/12 ordering information appears at end of data sheet. for related parts and recommended products to use with this part, refer to www.maxim-ic.com/max14984.related . general description the max14984 is a complete vga port protector with dual usb power switches. the device features all the circuitry required to detect the insertion and removal of a monitor and automatically connect the graphics controller when a monitor is detected. a switched 5v output provides up to 55ma to the vga port in addition to normal vga signals. the max14984 features a single active-low enable input to control two 5v usb switches. each switch sup - plies 500ma of current with less than 250mv drop from v cc , and is protected against short-circuit faults. two active-low fault outputs indicate when a fault condition is detected on either output. high-bandwidth analog switches exceed vesa rise/fall time requirements for the rgb channels. the horizontal and vertical synchronization (h/v) buffers shift logic lev - els to support +2.5v to +5.0v cmos or ttl-compatible graphics controllers while meeting the vesa drive capa - bility requirement of q 8ma. an internal 2.5v regulator and pullup resistors on the monitor side translate the ddc voltage levels to be compatible with low-voltage graphics controllers. the max14984 features high-esd protection of q 8kv human body model (hbm) on all vga and usb out - puts. the device is available in a 24-pin (4mm x 4mm) tqfn package and is specified over the -40 n c to +85 n c extended temperature range. applications servers workstations desktop pcs benefits and features s design flexibility ? graphics controller port is protected when v cc = 0v ? external pullup resistors match ddc channel to graphics controller supply ? up to two usb ports supported s high level of integration for performance ? s5v provides +5v at 55ma to vga port ? internal pullup resistors on ddc outputs to s5v ? low 6pf (typ) rgb capacitance ? 2.1ns (typ) t r /t f with 10pf, 2.2k i load on monitor-side sync signals ? source and sink 8ma while meeting speed requirements ? high-esd protection on vga and usb outputs q 8kv human body model (hbm) s saves space on board ? internal usb switches pass +5v at 500ma with 250mv (max) ir drop current limited/thermal protection ? 4mm x 4mm, 24-pin tqfn package r0, g0, b0 v cc hsync0, vsync0 scl0, sda0 f1, f2 md env enu graphics controller +3.3v +5v 3 2 2 2 +3.3v gnd r1, g1, b1 hsync1, vsync1 scl1, sda1 1f 1f s5v usb1 vga port 3 2 2 1f usb device usb2 1f usb device max14984 max14984 enhanced vga port protector with monitor detection and dual usb power switches evaluation kit available for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maxim-ic.com.
????????????????????????????????????????????????????????????????? maxim integrated products 2 max14984 enhanced vga port protector with monitor detection and dual usb power switches (all voltages referenced to gnd.) v cc , s5v, h0, v0, sda0, scl0, enu , env , sda1, scl1, usb1, usb2, md , f1 , f2 (note 1) ........... -0.3v to +6v r0, g0, b0, r1, g1, b1, h1, v1 .................. -0.3v to v cc + 0.3v continuous current out of usb1, usb2 .......................... 500ma continuous current out of s5v .......................................... 60ma continuous current through all i/o pins ........................ q 50ma peak current through rgb, ddc switches (1ms pulse, 10% duty cycle) .................................... q 100ma continuous power dissipation (t a = +70c) tqfn (derate 27.8mw/ n c above +70c) ................ 2222.2mw operating temperature range .......................... -40 n c to +85 n c junction temperature ..................................................... +150 n c storage temperature range ............................ -65 n c to +150 n c lead temperature (soldering, 10s) ................................ +300 n c soldering temperature (reflow) ...................................... +260 n c tqfn junction-to-ambient thermal resistance ( q ja ) .......... 36c/w junction-to-case resistance ( q ja ) ................................... 3c/w absolute maximum ratings stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional opera - tion of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. package thermal characteristics (note 2) electrical characteristics (v cc = 5.0v q 5%, t a = -40 n c to +85 n c, unless otherwise noted. typical values are at v cc = 5.0v and t a = +25 n c.) (note 3) note 1: when f1 and f2 are connected to a voltage higher than v cc , some current will be sinked (see the detailed description ). note 2: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a four- layer board. for detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial . parameter symbol conditions min typ max unit power supply supply voltage v cc 4.75 5.25 v supply current i cc v cc = +5.25v, v env = v enu = 0v, scl0 and sda0 not connected 2.3 5 ma v cc = +5.25v, v env = v enu = 0v, v scl0 = v sda0 = 0v 6.6 10 shutdown supply current i shdn v cc = +5.25v, v env = v enu = v cc 29 100 f a 5-volt switch (s5v) voltage drop v s5v i out = 55ma 135 300 mv reverse leakage current i l v s5v = +5.25v, v cc = 0v, v env = 0v 10 f a current limit i lim 55 305 500 ma usb switches (usb1, usb2) voltage drop v usb i out = 500ma 250 mv continuous load current i load 500 ma current-limit threshold i lim 0.5 1.0 a current-limit blanking period t blank (note 4) 7.5 50 ms output rise time t r r l = 10 i , c l = 1 f f, 10%C90 %, figure 1 11.6 f s output fall time t f r l = 10 i , c l = 1 f f, 90%C10%, figure 1 25.2 f s turn-on delay t on r l = 10 i , c l = 1 f f, to 10% of v out , figure 1 100 f s turn-off delay t off r l = 10 i , c l = 1 f f, to 90% of v out , figure 1 100 f s reverse leakage current i lusb v usb = 5.25v, v cc = 0v, v enu = 0v 10 f a pulldown resistance 1200 i
????????????????????????????????????????????????????????????????? maxim integrated products 3 max14984 enhanced vga port protector with monitor detection and dual usb power switches note 3: all units are production tested at t a = +25 n c. specifications over temperature are guaranteed by design. note 4: t blank is the period between detecting an overcurrent condition and the fault output asserting. note 5: see the pin description section for the esd status of each pin. note 6: terminal tested vs. gnd. apply 1 f f-bypass capacitors on v cc , usb1, usb2, and s5v. electrical characteristics (continued) (v cc = 5.0v q 5%, t a = -40 n c to +85 n c, unless otherwise noted. typical values are at v cc = 5.0v and t a = +25 n c.) (note 3) parameter symbol conditions min typ max unit ddc switches (sda0, scl0, sda1, scl1) sda1/scl1 off-leakage current i off v env = v cc , v sda1 = v scl1 = 0v or 5.25v -1 +1 f a sda0/scl0 off-leakage current i lddc v cc = 0v, 3.3k i pullup to +3.3v on sda0 and scl0 10 f a on-resistance r onddc v in = +0.8v, i in = q 10ma 7 i logic inputs (h0, v0, env , enu ) input logic-low v il 0.8 v input logic-high v ih 2.0 v input leakage current i l v in = 0v or 5.25v -1 +1 f a input hysteresis (h0, v0) v hyst 100 mv push-pull logic outputs (h1, v1) output logic-low v ol i sink = 8ma, v cc = +4.75v 0.5 v output logic-high v oh i source = 8ma, v cc = +4.75v 2.4 v rise/fall time t r , t f 10% to 90%, r l = 2.2k i , c l = 10pf 2.1 ns open-drain logic outputs ( f1 , f2 , md ) output leakage current i lkg output not asserted, v in = 5.25v 1 f a output logic-low v ol i sink = 1ma 0.3 v rgb analog switches (r0, g0, b0, r1, g1, b1) bandwidth f max r s = r l = 50 i 1000 mhz on-loss i loss f = 50mhz, r s = r l = 50 i , 0v p v in p +0.7v, figure 2 0.4 db on-resistance r on v in = +0.7v, i in = q 10ma 5 8 i on-resistance matching d r on 0v p v in p +0.7v, i in = q 10ma, same device 1 i on-resistance flatness r flat(on) 0v p v in p +0.7v, i in = q 10ma 0.25 1 i on-capacitance c on f = 1mhz, switches enabled 6 pf off-capacitance c off f = 1mhz, switches disabled 2 pf protection specifications high-esd pins esd protection human body model (note 5) q 8 kv all other pins esd protection human body model (note 6) q 2 kv thermal-shutdown threshold t shdn +155 n c thermal-shutdown hysteresis t shdn_ hys 25 n c
????????????????????????????????????????????????????????????????? maxim integrated products 4 max14984 enhanced vga port protector with monitor detection and dual usb power switches test circuits / timing diagrams figure 1. timing diagram for usb switch parameters figure 2. on-loss t off 90% 90% 10% 10% v enu v usb1, v usb2 3.3v 0v 5v t f t on t r 0v measurements are standardized against shorts at ic terminals. on-loss is measured between r0 and r1 on each switch. signal direction through is reversed; worst values are recorded. +5v 1f v out gnd v cc r0, g0, b0 r1, g1, b1 v in on-loss = 20log v out v in network analyzer 50i 50i 50i 50i meas ref 0v max14984 env
????????????????????????????????????????????????????????????????? maxim integrated products 5 typical operating characteristics (v cc = +5.0v, t a = +25 n c, unless otherwise noted) rgb on-resistance vs. analog signal voltage max14984 toc02 v r0 (v) r on (i) 4 3 2 1 10 20 30 40 50 0 05 t a = +85c t a = +25c t a = -40c i r0 = 10ma frequency response max14984 toc03 frequency (mhz) frequency response (db) 100 10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 -10 11 k go to g1 hsync/ vsync output voltage vs. temperature max14984 toc04 t a (c) v oh /v ol (v) 60 35 10 -15 1 2 3 4 5 0 -40 85 v oh v ol i source /i sink = 8ma ddc on-resistance vs. analog signal voltage max14984 toc01 v sda0 (v) r on (i) 1.5 1.0 0.5 10 20 30 40 50 0 02 .0 t a = +85c t a = +25c t a = -40c i sda0 = 10ma max14984 enhanced vga port protector with monitor detection and dual usb power switches
????????????????????????????????????????????????????????????????? maxim integrated products 6 max14984 enhanced vga port protector with monitor detection and dual usb power switches pin description pin configuration pin name function esd 1 r0 rgb analog input standard 2 g0 rgb analog input standard 3 b0 rgb analog input standard 4 h0 horizontal sync input standard 5 v0 vertical sync input standard 6 md monitor detect output. md is an active-low, open-drain output. standard 7 f1 fault output 1. f1 is an active-low, open-drain output that asserts when a fault condition is detected on usb1. standard 8 f2 fault output 2. f2 is an active-low, open-drain output that asserts when a fault condition is detected on usb2. standard 9 usb1 5v usb power output 1. usb1 is internally pulled down when not enabled. high 10 usb2 5v usb power output 2. usb2 is internally pulled down when not enabled. high 11 env video enable input. drive env low to connect the vga signals to the vga port. high 12 enu usb enable input. drive enu low to enable the usb power-supply outputs. high 23 24 22 21 8 7 9 g0 h0 v0 md 10 r0 g1 h1 v1 r1 s5v 12 v cc 45 6 17 18 16 14 13 sda0 scl0 usb2 usb1 f2 f1 max14984 b0 b1 3 15 v cc 20 11 env scl1 19 12 enu sda1 tqfn (4mm x 4mm) top view + *ep/ gn d *connect the exposed pad (e p/gnd) to the ground pl ane.
????????????????????????????????????????????????????????????????? maxim integrated products 7 max14984 enhanced vga port protector with monitor detection and dual usb power switches pin description (continued) pin name function esd 13 s5v switched 5v output. s5v is connected when env is low and is internally pulled down when not connected. high 14 v1 vertical sync output high 15 h1 horizontal sync output high 16 b1 rgb analog output high 17 g1 rgb analog output high 18 r1 rgb analog output high 19 sda1 ddc input/output. sda1 has an internal 2.5k i pullup resistor to s5v high 20 scl1 ddc input/output. scl1 has an internal 2.5k i pullup resistor to s5v high 21, 22 v cc supply voltage. v cc = 5.0v q 5%. bypass v cc to gnd with a 1 f f or larger ceramic capacitor as close as possible to v cc . standard 23 sda0 ddc input/output standard 24 scl0 ddc input/output standard ep/gnd exposed pad. the exposed pad is the ground connection for the device. connect ep/gnd to the ground plane.
????????????????????????????????????????????????????????????????? maxim integrated products 8 max14984 enhanced vga port protector with monitor detection and dual usb power switches functional diagram 2.5v regulator internal v l control logic gnd 2.5ki 200i s5v 2.5ki s5v r1 g1 b1 sda1 scl1 h1 v1 v0 h0 scl0 sda0 usb1 usb2 v cc env enu f2 f1 md b0 g0 r0 max14984 v cc 1ki 1ki monitor detection thermal protection
????????????????????????????????????????????????????????????????? maxim integrated products 9 max14984 enhanced vga port protector with monitor detection and dual usb power switches detailed description the max14984 integrates high-bandwidth analog switches and level-translating buffers with current-limited power switches to implement a vga port protector. the device provides switching for red-green-blue (rgb) signals, horizontal and vertical synchronization (h/v) pulses, display data channel (ddc) signals, and 5v power supplies. the power switches provide +5v power with current limiting and reverse voltage protection to the vga port and up to two usb ports. the device uses a simplified power-supply interface that operates from a single +5v supply. an internal 2.5v regulator limits the voltage passed by the ddc switches to provide compatibility with low-voltage graphics controllers. the device features two enable inputs, a monitor detec - tion output, and two fault outputs. env can be connected to md to automatically connect the graphics signal when a monitor is inserted. the fault outputs signal when a fault condition is detected on either of the usb power outputs and they are enabled by enu. 5v power switch (s5v) the max14984 provides a switched +5v output in addi - tion to the regular vga signals (s5v). this output can supply 55ma with less than 300mv drop from v cc . the s5v output tolerates +5v while turned off or when v cc is not present. the power switches are protected against overcurrent and overtemperature faults. the device limits current supplied to the monitor side to 300ma (typ). thermal protection circuitry shuts off the switch when the temper - ature exceeds +155 n c. the device is re-enabled once the temperature has fallen to below +130 n c. s5v is connected whenever env is low and has a 200 i (typ) pulldown resistor to discharge filter capacitors when the switch is off. usb switches and f1 / f2 outputs the max14984 features two switches that provide power for up to two usb connectors. one enable input, enu , controls both switches simultaneously. each switch can provide up to 500ma while only dropping 250mv from v cc . two active-low fault outputs, f1 and f2 , assert when a fault is detected on usb1 or usb2, respectively. two fault conditions can be detected: short circuit to gnd and overcurrent draw from the usb port. the switches are protected against reverse current into v cc while enu is high, but this condition is not detected by f1 and f2 . current-limiting and thermal-shutdown circuitry protects the device in the presence of any fault. a blanking period is built in to f1 and f2 that delays assertion until the current limit has been reached for at least t blank . in addition, an internal 1k i pulldown resis - tor is connected on each usb output when it is disabled. the f1 and f2 outputs are tolerant to external voltages of up to 6v. the max14984 limits the current into them to 600 f a. rgb switches the max14984 provides three single-pole/single-throw (spst) high-bandwidth switches to connect the standard vga r, g, and b signals from the graphics controller to the vga port. the r, g, b analog switches are identical, and any of the three switches can be used to route red, green, or blue video signals. the rgb switches are connected when env is low. horizontal/vertical sync buffer the h/v signals are buffered to provide level shifting and drive capability to meet the vesa specification. h1 and v1 are enabled when env is low and high imped - ance when env is high. the h and v channels are not interchangeable. display data channel switches (sda_, scl_) the max14984 provides two voltage-limited spst switches to connect ddc signals (sda_, scl_). these switches limit the voltage that can be passed through to the graphics controller to less than 2.5v. internal pullup resistors on the monitor side of the switches translate the graphics controller signals to 5v compatible logic. connect pullup resistors on scl0 and sda0 to define the logic level of the graphics controller. the sda_ and scl_ switches are connected when env is low and are identical; either switch can be used to route sda or scl i 2 c signals.
???????????????????????????????????????????????????????????????? maxim integrated products 10 max14984 enhanced vga port protector with monitor detection and dual usb power switches monitor detection and automatic switching the max14984 detects monitor insertion/removal events by measuring the voltage on b1. the monitor detection circuitry always correctly indicates the presence of a monitor as long as v0 is not high impedance. the volt - age measurement is only sampled between synchroniza - tion pulses on v0 from the controller when a monitor is inserted to ensure that the video signal is not interrupted while promptly detecting a removal. the device automatically connects the graphics control - ler to the monitor when it is plugged in if configured in automatic mode. to configure automatic mode, connect md to env and add a pullup resistor. applications information compatibility with low-voltage graphics controllers the max14984 provides the level shifting necessary to drive a standard vga port using any graphics controller. internal buffers drive the h and v signals to vga stand - ard ttl levels. the ddc switches provide level shifting by limiting signal levels that can be passed through the ddc switches to less than 2.5v. add pullup resistors from the ddc lines to the graphics controller supply to set the logic level on the sda0/scl0 side. power-supply decoupling bypass v cc to ground with a 1 f f or larger ceramic capacitor as close to the device as possible. pc board layout high-speed switches such as the max14984 require proper pcb layout for optimum performance. ensure that impedance-controlled pcb traces for high-speed signals are matched in length and as short as possible. connect the exposed pad to a solid ground plane. high esd protection electrostatic discharge (esd) protection structures are incorporated on all pins to protect against electrostatic discharges up to q 2kv human body model (hbm) encountered during handling and assembly. all vga and usb outputs are further protected against esd up to q 8kv (hbm) without damage (see the pin description ) . the esd structures withstand high esd both in normal operation and when the device is powered down. after an esd event, the max14984 continues to function with - out latchup. esd test conditions esd performance depends on a variety of conditions. contact maxim for a reliability report that documents test setup, test methodology, and test results. human body model figure 3 shows the human body model. figure 4 shows the current waveform it generates when discharged into a low impedance. this model consists of a 100pf capacitor charged to the esd voltage of interest that is then discharged into the device through a 1.5k i resistor. figure 3. human body esd test model figure 4. human body current waveform charge-current- limit resistor discharge resistance storage capacitor c s 100pf r c 1m r d 1.5k high- voltage dc source device under test 100% 36.8% t rl time t dl peak-to-peak ringing (not drawn to scale) i r 0 0 i peak (amps) 90% 10%
???????????????????????????????????????????????????????????????? maxim integrated products 11 max14984 enhanced vga port protector with monitor detection and dual usb power switches ordering information + denotes a lead(pb)-free/rohs-compliant package. * ep = exposed paddle. package information for the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages . note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. chip information process: bicmos part temp range pin-package MAX14984ETG+ -40 n c to +85 n c 24 tqfn-ep* package type package code outline no. land pattern no. 24 tqfn-ep t2444+3 21-0139 90-0021
maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 12 ? 2012 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 3/12 initial release max14984 enhanced vga port protector with monitor detection and dual usb power switches

▲Up To Search▲

Price & Availability of MAX14984ETG

	To Download MAX14984ETG Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .