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may 2011 ? 2010 fairchild semiconductor corporation www.fairchildsemi.com FXLP4555 ? rev. 1.0.0 FXLP4555 ? 1.8v / 3.0v sim card power supply and level shifter FXLP4555 1.8v / 3.0v sim card power supply and level shifter features ? supports 1.8v or 3.0v sim cards ? ldo supplies >50ma under 1.8v and 3.0v ? built-in pull-up resistor for i/o pin in both directions ? esd protection: 8kv (human body model, according to iso-7816 specifications) ? supports clock ? 5mhz ? supports ?clock stop? power management per iso7816-3 specifications ? low-profile 3x3mm mlp-16 package applications ? sim card interface circuit for 2g, 2.5g, and 3g mobile phones ? identification module ? smart card readers ? wireless pc cards description the FXLP4555 is a level-shifter analog circuit designed to translate the voltages between a sim card and an external baseband. a built-in ldo-type dc-dc converter allows the FXLP4555 to drive 1.8v and 3.0v sim cards. the device fulfills the iso7816-3 smart-card interface standard as well as gsm 11.11 (11.12 and 11.18) and 3g mobile requir ements (imt-2000/3g uicc standard). the en pin enables a low-current shutdown mode that extends battery life. the card power supply voltage (vcc_c) is selected using a single pin (vsel). ordering information part number operating temperature range top mark package packing method FXLP4555mpx -40 to +85c fxlp 4555 16-lead,mlp,quad,jedec mo-220,3mm square 3000 units on tape & reel
? 2010 fairchild semiconductor corporation www.fairchildsemi.com FXLP4555 ? rev. 1.0.0 2 FXLP4555 ? 1.8v / 3.0v sim card power supply and level shifter application diagram figure 1. typical application functional block diagram figure 2. block diagram 1 13 15 14 7 11 8 9 ldo : 1 .8 v /3 v at 50ma 5 vbat vcc _ c 2 3 vcca vsel i / o _ h clk _ h rst _ h rst _ c clk _ c i/ o _ c unidirectional driver unidirectional drive r bidirectional npassgate with edge rate a ccelerators 18k 14k 10 gnd en gnd gnd gnd gnd vcca vcc _ c
? 2010 fairchild semiconductor corporation www.fairchildsemi.com FXLP4555 ? rev. 1.0.0 3 FXLP4555 ? 1.8v / 3.0v sim card power supply and level shifter pin configuration 16 15 14 13 1 2 3 4 12 11 10 9 8 7 6 5 FXLP4555 exposed dap (gnd) en vsel vcca nc rst_c gnd clk_c nc figure 3. pin a ssignments (top view) pin definitions pin name type description 1 en input power-down mode. en=low low-current shutdown mode activated. en=high normal operation. a low level on this pin rese ts the sim interface, switching off the v cc_c . 2 vsel input the signal present on this pin programs the sim_v cc value: vsel=low sim_v cc =1.8v; vsel=high sim_v cc =3v. 3 vcca power connected to the baseband power supply; this pin configures the level shifter input stage to accept signals from the baseband. a 0.1f capacitor is used to bypass the power supply voltage. when v cca is below 1.1v (typical), the v cc_c (sim card v cc ) is disabled and FXLP4555 enters shutdown mode. 4 nc no connect. it is recomme nded to solder to pcb gnd. 5 vbat power ldo converter supply input. the input voltage ranges from 2.7v to 5.5v. this pin needs to be bypassed by a 0.1f capacitor. 6 nc no connect. it is recomme nded to solder to pcb gnd. 7 vcc_c power connected to the sim card power supply pin. an internal ldo converter is programmable by the external baseband to supp ly either 1.8v or 3.0v output voltage. an external 1.0f minimum ceramic capacitor must be connected across v cc_c and gnd. during a normal operation, the v cc_c voltage can be set to 1.8v, followed by a 3.0v value, or can start direct ly at either of these values. 8 i/o_c input/ output handles the connection to the se rial i/o of the card connecto r. a bi-directional level translator adapts the serial i/o signal bet ween the card and the baseband. a 14k ? (typical) pull-up resistor provides a high -impedance state for the sim card i/o link. 9 rst_c output connected to the reset pin of the card connector. a level translator adapts the external reset (rst) si gnal to the sim card. 10 gnd ground ground reference for the integrated circuit and associated signals. care must be taken to avoid voltage spikes when t he device operates in normal operation. 11 clk_c output connected to the clock pin of the card connector. the clock (clk) signal comes from the external clock generator; the inte rnal level shifter adapts the voltage defined for the v cc_c . 12 nc no connect. it is recomme nded to solder to pcb gnd. 13 clk_h input the clock signal, coming from the external controller, must have a duty cycle within the range defined by the spec ification (typically 50%). the built-in level shifter translates the input signal to the external sim card clk input.
? 2010 fairchild semiconductor corporation www.fairchildsemi.com FXLP4555 ? rev. 1.0.0 4 FXLP4555 ? 1.8v / 3.0v sim card power supply and level shifter pin definitions (continued) pin name type description 14 rst_h input the reset signal present at this pin is connected to the sim card through the internal level shifter, which translates the level according to the v cc_c programmed value. 15 i/o_h input/ output this pin is connected to the baseband. a bidirectional level translator adapts the serial i/o signal between the smart card and t he baseband. a built-in constant 18k ? (typical) resistor provides a high-impe dance state when not activated. 16 nc no connect. it is recomme nded to solder to pcb gnd. 17 exposed dap ground must be soldered to pcb ground plane.
? 2010 fairchild semiconductor corporation www.fairchildsemi.com FXLP4555 ? rev. 1.0.0 5 FXLP4555 ? 1.8v / 3.0v sim card power supply and level shifter absolute maximum ratings stresses exceeding the absolute maximum ratings may dam age the device. the device may not function or be operable above the recommended operating conditions and stressi ng the parts to these levels is not recommended. in addition, extended exposure to stresses above the recomm ended operating conditions may affect device reliability. the absolute maximum ratings are stress ratings only. t a =+25c. symbol parameter min. typ. max. unit v bat ldo power supply voltage -0.5 v bat 6.0 v v cca power supply from baseband side -0.5 v cca 6.0 v v cc_c external card power supply -0.5 v cc_c 6.0 v v in digital input pin voltage -0.5 v in v cca +0.5, but <6.0 v i in digital input pin current -5 +5 ma v out digital output pin voltage -0.5 v out v cca +0.5, but <6.0 v i out digital output pin current -10 +10 ma v out_sim sim card output pin voltage -0.5 v out sim_v cc + 0.5<6.0 v i out_sim sim card output pin current (1) 15 ma p d power dissipation at t a =+85c 440 mw ja thermal resistance, junction-to-air 72 c/w t a operating ambient temper ature range -40 +85 c t j operating junction temperature range -40 +125 c t jmax maximum junction temperature +125 c t stg storage temperature range -65 +150 c esd electrostatic discharge capability human body model, jesd22-a114 r=1500 ? , c=100pf sim card pins (7,8,9,10,11) 8000 v all other pins 2000 charged device model, jesd22-c101 sim card pins (7,8,9,10,11) 2000 all other pins 600 moisture sensitivity level 1 level notes: 1. internally limited. 2. meets or exceeds jedec specif ication eia/jesd78 ic latchup test.
? 2010 fairchild semiconductor corporation www.fairchildsemi.com FXLP4555 ? rev. 1.0.0 6 FXLP4555 ? 1.8v / 3.0v sim card power supply and level shifter electrical characteristics t a =-40c to +85c. device meets the s pecifications after thermal equilibri um has been established when mounted in a test socket or printed circuit board with maintained trans verse airflow greater than 500l fpm. electrical parameters are guaranteed only over the declared oper ating temperature range. functional operation of the device exceeding these conditions is not implied. device specification limit values are appli ed individually under normal operating conditions and not valid simultaneously. symbol parameter condition min. typ. max. unit power supply section v bat power supply 2.7 5.5 v i v bat operating current i cc =0ma, v bat > 3.0v if v sel =1 or v bat > 2.7v if v sel =0 16 25 a i v bat_sd shutdown current en=low 3 a v cca operating voltage 1.65 5.50 v i vcca operating current (3) fclk=1mhz 7 12 a iv cca_sd shutdown current en=low 1 a v cca under-voltage lockout 0.6 1.5 v v cc_c sim card supply voltage v sel =high, v bat =3.0v, iv cc_c =50ma 2.8 v v sel =high, v bat =3.3v ? 5.5v, iv cc_c =0ma - 50ma 2.8 3.0 3.2 vsel=low, v bat =2.7v ? 5.5v, iv cc_c =0ma - 50ma 1.7 1.8 1.9 i vcc_c_sc short-circuit current v cc_c shorted to ground, t a =25c 175 ma d igital input / output section ( clk, rst, i/o, en, vsel ) v in input voltage range en, vsel, rst_h, clk_h, i/o_h 0 v cca v i ih , i il input current en, vsel, rst_h, clk_h -100 100 na v ih high level input voltage rst_h, clk_h, en, vsel 0.7 ? v cca v cca v v il low level input voltage rst_h, clk_h 0.2 * v cca v en, vsel 0 0.4 v oh_i/o high level output voltage i/o_c=v cc_c , i oh_i/o =-20a 0.7 ? v cca v cca v v ol_i/o low level output voltage i/o_c=0 v, i ol_i/o =200a 0 0.4 v i ih high level input current i/o -20 20 a i il low level input current i/o 1.0 ma r pu_i/o_h i/o pull-up resistor 12 18 24 k ? continued on the following page?
? 2010 fairchild semiconductor corporation www.fairchildsemi.com FXLP4555 ? rev. 1.0.0 7 FXLP4555 ? 1.8v / 3.0v sim card power supply and level shifter electrical characteristics (continued) symbol parameter condition min. typ. max. unit sim interface section (4) rst_c v cc_c =+3.0v (v sel =high) output rst_c v oh at i rst_c =-20a 0.9 ? v cc_c v cc_c v output rst_c v ol at i rst_c =+200a 0 0.4 v output rst_c rise time at c out =30pf (10% - 90%) (3) 1 s output rst_c fall time at c out =30pf (90% - 10%) (3) 1 s v cc_c =+1.8v (v sel =low) output rst_c v oh at i rst_c =-20a 0.9 ? v cc_c v cc_c v output rst_c v ol at i rst_c =+200a 0 0.4 v output rst_c rise time at c out =30pf (10% - 90%) (3) 1 s output rst_c fall time at c out =30pf (90% - 10%) (3) 1 s clk_c v cc_c =+3.0v (v sel =high) output duty cycle 40 60 % maximum output frequency 5 mhz output v oh at i clk_c =-20a 0.9 ? v cc_c v cc_c v output v ol at i clk_c =+200a 0 0.4 v output clk_c rise time at c out =30pf (10% - 90%) (3) 18 ns output clk_c fall time at c out =30pf (90% - 10%) (3) 18 ns v cc_c =+1.8v (v sel =low) output duty cycle 40 60 % maximum output frequency 5 mhz output v oh at i clk_c =-20a 0.9 ? v cc_c v cc_c v output v ol at i clk_c =+200a 0 0.4 v output clk _c rise time at c out =30pf (10% - 90%) (3) 18 ns output clk_c fall time at c out =30pf (90% - 10%) (3) 18 ns continued on the following page?
? 2010 fairchild semiconductor corporation www.fairchildsemi.com FXLP4555 ? rev. 1.0.0 8 FXLP4555 ? 1.8v / 3.0v sim card power supply and level shifter electrical characteristics (continued) symbol parameter condition min. typ. max. unit i/o_c v cc_c =+3.0v (v sel =high) output v oh at i i/o_c =-20a, v i/o =v dd 0.8 ? v cc_c v cc_c v output v ol at i i/o_c =+1ma, v i/o =0v 0 0.4 v i/o_c rise time at c out =30pf (10% - 90%) (3) 1 s i/o_c fall time at c out =30pf (90% - 10%) (3) 1 s v cc_c =+1.8v (v sel =low) output v oh at i i/o_c =-20a, v i/o =v dd 0.8 ? v cc_c v cc_c v output v ol at i i/o_c =+1ma, v i/o =0v 0 0.3 v i/o_c rise time at c out =30pf (10% - 90%) (3) 1 s i/o_c fall time at c out =30pf (90% - 10%) (3) 1 s r pu_i/o_c card i/o pull-up resistor 10 14 18 k ? notes: 3. guaranteed by design over the spec ified operating temperature range. 4. all the dynamic specifications (ac s pecifications) are guaranteed by characte rization over the specified operating temperature range, unless otherwise indicated.
? 2010 fairchild semiconductor corporation www.fairchildsemi.com FXLP4555 ? rev. 1.0.0 9 FXLP4555 ? 1.8v / 3.0v sim card power supply and level shifter typical performance characteristics figure 4. short-circuit current ,(i vcc_c_sc ) vs. temperature v cc_c =1.8v (v sel =low) figure 5. short-circuit current, (i vcc_c_sc ) vs. temperature v cc_c =3.0v (v sel =high) figure 6. i v bat vs. temperature at v cc_c =3.0v (v sel =high) figure 7. i v bat vs. temperature at v cc_c =1.8v (v sel =low) v bat = ? 5.5v v bat = ? 2.7v 50 70 90 110 130 150 \ 50 \ 30 \ 10 10 30 50 70 90 i vcc_c_sc ? (ma) temperature ? (c) v bat = ? 5.5v v bat ? = ? 3.1v 5 10 15 20 25 \ 50 0 50 i ? v bat (a) temperature ? ( ? c) v bat = ? 5.5v v bat = ? 2.7v 5 10 15 20 25 \ 50 \ 30 \ 10 10 30 50 70 90 i ? v bat (a) temperature ? ( ? c)
? 2010 fairchild semiconductor corporation www.fairchildsemi.com FXLP4555 ? rev. 1.0.0 10 FXLP4555 ? 1.8v / 3.0v sim card power supply and level shifter application information card supply converter the FXLP4555 interface dc-dc converter is a low dropout (ldo) voltage regulat or capable of supplying a current in excess of 50ma under 1.8v or 3.0v. quiescent current is typically lower than 20a (see figure 6 and figure 7). vsel is a select input, allowing a logic level signal to select a regulated voltage of 1.8v (vsel = low) or 3.0v (vsel = high). FXLP4555 has a shutdown input (en) that allows it to turn off or turn on the regulator output. figure 8 shows a simplified view of the voltage regulator. the v cc_c output is internally current limited and protected against short circuits. the short-circuit current (i vcc_c_sc ) is constant over the sim card v cc and v bat, while it varies with operating temperature, typically in the range of 90ma to 140ma (figure 4 and figure 5). to guarantee a stable ldo, the vcc_c output is connected to a 1.0f bypass ceramic capacitor to ground. at the input, v bat is bypassed to ground with a 0.1f ceramic capacitor. level shifters the level shifters accommodate any voltage difference between the baseband (bb) processor (1.65v ? 5.5v) and the sim card (1.8v or 3v). the reset and clock level shifters are uni-directional (from bb to sim). the bidirectional i/o line automatically adapts the voltage difference between the baseband and the sim card in both directions. in addition, with the pull-up resistor, an active edge rate accelerator circuit ( see figure 9 ) provides a fast charge of the stray capacitance, yielding a rise time within the iso7816-3 specifications. the typical waveform provided in figure 10 shows how the accelerator operates. two distinct slew rates are observed. from 0v to approx imately vcc/2, the slew rate is the rc time constant of the pull-up resistor and the stray capacitance. when the input slope crosses the vcc/2 threshold, the edge rate accelerator is activated, resulting in the faster slew rate from approximately vcc/2 to v cc as depicted in figure 10. figure 8. simplified block diagram of the ldo voltage regulator figure 9. basic i/o line interface figure 10. sim_io typical rise and fall times with stray capacitance > 30pf (33pf capacitor connected on the board) figure 11. typical schmitt trigger characteristics vsel vcc_c en vbat
? 2010 fairchild semiconductor corporation www.fairchildsemi.com FXLP4555 ? rev. 1.0.0 11 FXLP4555 ? 1.8v / 3.0v sim card power supply and level shifter applications information (continued) input schmitt triggers all the logic input pins (except i/o_h and i/o_c) have built-in schmitt trigger circuits to prevent uncontrolled operation. typical dynamic characteristics of the related pins are depicted in figure 11. the output signal is guaran teed to go high when the input voltage is above 0.7 x v dd and go low when the input voltage is below 0.4v. see electrical characteristics section. shutdown operating to save power, it is possible to put the FXLP4555 in shutdown mode by setting the pin en low. the device enters shutdown mode automatically when v cca goes lower than 1.1v typically. esd protection the FXLP4555 sim interface features an hbm esd voltage protection in excess of 7kv for all the sim pins (io_c, clk_c, rst_c, v cc_c and gnd). all the other pins (host side) sustain at least 2kv. the hbm esd voltage required by the iso7816 standard is 4kv. printed circuit board (pcb) layout careful layout routing should be applied to achieve efficient operating of the devi ce in its mobile or portable environment and to fully exploit its performance. the bypass capacitors must be connected as close as possible to the device pins (vcc_c, vcca, or vbat) to reduce possible parasitic behaviors (ripple and noise). it is recommended to use ceramic capacitors. the exposed pad should be connected to ground as well as the unconnected pins (nc). a relatively large ground plane is recommended. clock stop section 6.3.2 of iso7816-3 identifies the ?power management? feature of clock stop. for cards supporting clock stop, when the interface device expects no transmission from the card and when i/o has remained at state h for at least 1,860 clock cycles (delay t g ), then according to figure 13, the interface device may stop the clock on clk (at time t e ) while the sim card v cc remains powered and rst at state h. figure 12. clock stop when the clock is stopped (from time t e to time t f ), clk shall be maintained either at state h or at state l, according to the clock stop indicator x defined in section 8.3 of the iso7816- 3 specification. at time t f , the interface device restarts the clock and the information exchange on i/o ma y continue after at least 700 clock cycles (at time t f + t h ). the FXLP4555 supports the above description of clock stop per iso7816-3 specifications.
? 2010 fairchild semiconductor corporation www.fairchildsemi.com FXLP4555 ? rev. 1.0.0 12 FXLP4555 ? 1.8v / 3.0v sim card power supply and level shifter physical dimensions figure 13. 16-lead, molded leadless package (mlp), quad, jedec mo-220, 3mm square package drawings are provided as a service to customers consi dering fairchild components. drawings may change in any manner without notice. please note the revision and/or date on the drawi ng and contact a fairchild semiconductor representative to ver ify or obtain the most recent revision. package specifications do not expand the terms of fairchild?s worldwide terms and conditions, specifically the warranty therein, which covers fairchild products. always visit fairchild semiconductor?s online packagi ng area for the most recent package drawings: http://www.fairchildsemi.com/packaging/mlp16b.html. for current tape and reel specifications, visi t fairchild semiconductor?s online packaging area: http://www.fairchildsemi.com/packaging/3x3mlp16_pack_tnr.pdf .
? 2010 fairchild semiconductor corporation www.fairchildsemi.com FXLP4555 ? rev. 1.0.0 13 FXLP4555 ? 1.8v / 3.0v sim card power supply and level shifter

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