1997 1 mic2558 mic2558 micrel ordering information part number temperature range package mic2558bm ?0 c to +85 c 14-pin soic mic2558bm t&r ?0 c to +85 c 14-so tape & reel* * 2,500 parts per reel. mic2558 pcmcia dual card socket v pp switching matrix final information features complete pcmcia v pp switch matrix in a single ic dual matrix allows independent v pp1 and v pp2 digital selection of 0v, v cc , v pp , or high impedance output no v ppout overshoot or switching transients break-before-make switching ultra low power consumption 120ma v pp (12v) output current optional active source clamp for zero volt condition 3.3v or 5v supply operation 14-pin soic package general description the mic2558 dual v pp matrix switches the four voltages required by pcmcia (personal computer memory card international association) card v pp1 and v pp2 pins. the mic2558 provides selectable 0v, 3.3v, 5.0v, or 12.0v ( 5%) from the system power supply to v pp1 and v pp2 . output voltage is selected by two digital inputs per v pp pin. output current ranges up to 120ma. four output states, v pp , v cc , high impedance, and active logic low are available, and v pp1 is independent of v pp2 . an auxiliary control input determines whether the high impedance (open) state or low logic state is asserted. in standby mode or full operation, the device draws very little quiescent current, typically less than 1 a. the mic2558 is available in a 14-pin soic package. applications pcmcia v pp pin voltage switch power supply management nc en1 1 en0 1 mic2558 +v cc1 v dd hi-z/low1 v pp out1 v pp in en1 2 en0 2 hi-z/low2 gnd +v cc2 v pp out2 7 6 5 4 3 2 8 9 10 11 12 13 14 en1 en0 hi-z/low v pp out 0 0 0 0v, (sink current) 0 0 1 hi-z (no connect) 01 x v cc (3.3v or 5.0v) 10 x v pp 1 1 x hi-z (no connect) +3.3v or +5v v pp out 1 0.1f en0 1 en1 1 1f 1f +12v v pp in +5v hi-z/ low 1 control v dd v cc en0 2 en1 2 hi-z/ low 2 control v pp out 2 0.1f mic2558 7 6 5 4 3 2 8 9 10 11 12 13 14 0.1f typical application pin configuration micrel, inc. ?1849 fortune drive ?san jose, ca 95131 ?usa ?tel + 1 (408) 944-0800 ?fax + 1 (408) 944-0970 ?http://www.mic rel.com
mic2558 micrel mic2558 2 1997 absolute maximum ratings (notes 1 and 2) power dissipation, t ambient 25 c soic 800 mw derating factors (to ambient) soic 4 mw/ c storage temperature 65 c to +150 c operating temperature (die) 125 c operating temperature (ambient) 40 c to +85 c lead temperature (5 sec) 260 c v dd v dd v pp in en1 1 v pp out1 v cc1 v pp in hiz/ low 1 en0 1 v dd v dd v dd 3 1 13 12 14 11 v dd v pp in en1 2 gnd v pp out2 v cc2 hiz/ low 2 en0 2 v dd v dd v dd 5 6 10 9 8 v pp in v dd 4 7 supply voltage, v pp in 15v v cc 7.5v v dd 7.5v logic input voltages 0.3v tov dd output current (each output) v pp out = 12v 600ma v pp out = v cc 250ma logic block diagram
1997 3 mic2558 mic2558 micrel electrical characteristics: (over operating temperature range with v dd = v cc = 5v, v pp in = 12 v unless otherwise specified.) symbol parameter conditions min typ max units input v ih logic 1 input voltage 2.2 v v il logic 0 input voltage 0.8 v v in (max) input voltage range 5v dd v i in input current 0 v < v in < v dd 1 a each output v ol clamp low output voltage en0 = en1 = hiz = 0, i sink = 1.6ma 0.4 v i out , hi-z high impedance output en0 = en1 = 0, hiz = 1. 1 10 a leakage current 0 v pp out 12v r oc clamp low output resistance resistance to ground. i sink = 2ma 130 250 ? en0 = en1 = 0, hiz = 0. r o switch resistance, i pp out = 10 ma (sourcing) 2.5 5 ? v pp out = v cc r o switch resistance, i pp out = 100 ma (sourcing) 0.5 1 ? v pp out = v pp in switching time (see figure 1) t 1 delay + rise time v pp out = 0v to 5v (notes 3, 5) 15 50 s t 2 delay + rise time v pp out = 5v to 12v (notes 3, 5) 12 50 s t 3 delay + fall time v pp out = 12v to 5v (notes 3, 5) 25 75 s t 4 delay + fall time v pp out = 5v to 0v (notes 3, 5) 45 100 s t 5 output turn-on delay v pp out = hi-z to 5v (notes 4, 5) 10 50 s t 6 output turn-off delay v pp out = 5v to hi-z (notes 4, 5) 75 200 ns power supply i dd v dd supply current 1 a i cc v cc supply current i pp out = 0 1 a i pp i pp supply current v pp out1 = v ppout2 = 0 v or v pp . 10 a i ppout = 0. v pp out1 = v ppout2 = v cc 20 80 a
mic2558 micrel mic2558 4 1997 v cc operating input voltage 6v v dd operating input voltage 2.8 6 v v pp in operating input voltage 8.0 14.5 v note 1: functional operation above the absolute maximum stress ratings is not implied. note 2: static-sensitive device. store only in conductive containers. handling personnel and equipment should be grounded to prevent damage from static discharge. note 3: with r l = 2.9k ? and c out = 0.1 f on v pp out . note 4: r l = 2.9k ? . r l is connected to v cc during t 5 , and is connected to ground during t 6 . note 5: rise and fall times are measured to 90% of the difference of initial and final values. electrical characteristics (continued) hi-z/low en0 en1 12v 5v v pp out 0 t 1 t 2 t 3 3v 0 3v 0 3v 0 t 5 t 6 t 4 figure 1. timing diagram. symbol parameter conditions min typ max units power supply, continued
1997 5 mic2558 mic2558 micrel applications information pcmcia v pp 1 and v pp2 control is easily accomplished using the mic2558 voltage selector/switch ic. two control bits per v pp out pin determine output voltage and standby/ operate mode condition. output voltages of 0v (defined as less than 0.4v), v cc (3.3v or 5v), v pp , or a high impedance state, are available. when either the high impedance or low voltage conditions are selected, the device switches into "sleep" mode and draws only nanoamperes of leakage current. the mic2558 is a dual low-resistance power mosfet switching matrix that operates from the computer system main power supply. device power is obtained from v dd , which may be either 3.3v or 5v, and fet drive is obtained from v pp in (usually +12v). internal break-before-make switches determine the output voltage and device mode. v pp1 and v pp2 are completely indepenent from each other. supply bypassing for best results, bypass v cc and v pp in inputs with 1 f capacitors. both v pp out pins should have a 0.01 f to 0.1 f capacitor for noise reduction and electrostatic dis- charge (esd) damage prevention. larger values of output capacitor will create large current spikes during transitions, requiring larger bypass capacitors on the v cc and v pp in pins. figure 3. mic2558 typical two slot pcmcia applica- tion with single 5.0v v cc . system power supply pcmcia card slot controller mic2558 pcmcia card slot a pcmcia card slot b mic2558 5v 12v en0 1 en1 1 en1 2 en0 2 en1 1 en0 1 en1 2 en0 2 v pp1 v pp2 v cc v pp1 v pp2 v cc v cc switch v pp in v cc v pp in v cc pcmcia implementation the personal computer memory card international asso- ciation (pcmcia) specification requires two v pp supply pins per pcmcia slot. v pp is primarily used for programming flash (eeprom) memory cards. the two v pp supply pins may be programmed to different voltages. fully implement- ing pcmcia specifications requires a mic2558 and a con- troller. figure 2 shows this full configuration, supporting both 5.0v and 3.3v v cc operation. figure 3 is a simplified design with fixed v cc = 5v. when a memory card is initially inserted, it should receive v cc usually 5.0v 5%. the card sends a handshaking data stream to the controller, which then determines whether or not this card requires v pp and if the card is designed for 5.0v or 3.3v v cc . if the card uses 3.3v v cc , the controller commands this change, which is reflected on the v cc pins of both the pcmcia slot and the mic2558. during flash memory programming, the pcmcia controller outputs a (1,0) to one or both halves of the mic2558, which connects v pp in to v pp out1 and/or v pp out2 . the low on resistance of the mic2558 switch requires only a small bypass capacitor on the v pp out pins, with the main filtering system power supply pcmcia card slot controller v cc select and switch mic2558 pcmcia card slot a pcmcia card slot b v cc select and switch mic2558 5v 3.3v 12v en0 1 en1 1 en1 2 en0 2 en1 1 en0 1 en1 2 en0 2 v pp1 v pp2 v cc v pp1 v pp2 v cc v pp in v cc v pp in v cc figure 2. mic2558 typical two slot pcmcia applica- tion with dual v cc (5.0v or 3.3v).
mic2558 micrel mic2558 6 1997 action performed by a large filter capacitor on v pp in . the v pp out transition from v cc to 12.0v typically takes 25 s. after programming is completed, the controller outputs a (0,1) to the mic2558, which then reduces v pp out to the v cc level. break-before-make switching action reduces switching transients and lowers maximum current spikes through the switch from the output capacitor. if no card is inserted, or the system is in sleep mode, the controller outputs either a (0,0) or a (1,1) to the mic2558. either input places the switch into shutdown mode, where current consumption drops even further. the hiz/low input controls the optional logic low output clamp. with hiz/low in the high state and en0 = en1 = 0, v pp out enters a high impedance (open) state. with hiz/ low in the low state and en0 = en1 = 0, v pp out is clamped to ground, providing a logic low signal. the clamp does not require any dc bias current for operation. figure 3. full pcmcia implementation of v pp and v cc switching using mic2558 and mic2951 voltage regulator. v pp out 1 0.1f en0 1 en1 1 1f +12v v pp in +5v hi-z/ low 1 control v dd en0 2 en1 2 hi-z/ low 2 control v pp out 2 0.1f mic2558 7 6 5 4 3 2 8 9 10 11 12 13 14 0.1f mic2951 sd v gnd 4 7 8 out +v in fb 1 3 shutdown input 100pf 2n2222 1% 300k ? v in = +5.3v to +15v 1% 180k ? + 3.3f 470 k ? off on 220k ? 1% ttl logic level high (v > 1.5v) v cc = 5.0v low (v < 0.5v) v cc = 3.3v v cc switching and control block mosfet drive and bias voltage is derived from v pp in . internal device control logic is powered from v dd , which should be connected to the same supply voltage as the pcmcia controller (normally either 3.3v or 5v). output current mic2558 output switches are capable of far more current than usually needed in pcmcia applications. pcmcia v pp output current is limited primarily by switch resistance voltage drop ( i x r ) and the requirement that v pp out cannot drop more than 5% below nominal. v pp out will survive output short circuits to ground if v pp in or v cc are current limited by the regulator that supplies these voltages.
1997 7 mic2558 mic2558 micrel package information 45 3 6 0.244 (6.20) 0.228 (5.80) 0.344 (8.75) 0.337 (8.55) 0.006 (0.15) seating plane 0.026 (0.65) max ) 0.016 (0.40) typ 0.154 (3.90) 0.057 (1.45) 0.049 (1.25) 0.193 (4.90) 0.050 (1.27) typ pin 1 dimensions: inches (mm) 14-pin sop (m)
mic2558 micrel mic2558 8 1997 micrel inc. 1849 fortune drive san jose, ca 95131 usa tel + 1 (408) 944-0800 fax + 1 (408) 944-0970 web http://www.micrel.com this information is believed to be accurate and reliable, however no responsibility is assumed by micrel for its use nor for an y infringement of patents or other rights of third parties resulting from its use. no license is granted by implication or otherwise under any patent or pat ent right of micrel inc. ? 1997 micrel incorporated
|
