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ver 1.3 jul 19, 2002 tel: 886-3-5788833 http://www.gmt.com.tw 1 g218b global mixed-mode technology inc. ultra160 multi-mode lvd/se scsi terminator features ? auto-selectable multi-mode single-ended or lvd termination ? meets scsi-1, scsi-2, scsi-3 spi ultra (fast-20), ultra 2(spi-2 lvd), ultra160 (spi-3 lvd) standards. ? supports active negation ? 3pf channel capacitance ? thermal protection ? hot-swap compatible ? 5% tolerance on se and lvd termination resistance ? 28 and 36 pin ssop package ? 28 pin ssop: pin compatible with ds2119 ? 36 pin ssop: pin compatible with ds2118, lx5241 and ucc5630 applications ? server and workstation ? high-end pc ? industrial pc ? disk array (raid) ? scsi cable general description the g218b multi-mode lvd/se scsi terminator pro- vides a smooth transition into the next generation of the scsi parallel interface (spi-3). it automatically senses the bus, via diffsens, and switches the ter- mination to either single-ended (se) or low voltage differential (lvd) scsi, dependent on which type of devices are connected to the bus. if the g218b de- tects a hvd scsi device, it switches to a high imped- ance state. for a 16-bit wide scsi bus to be opera- tional, three g218b terminators are needed. the multi-mode terminator contains all functions re- quired to terminate and auto detect and switch modes for scsi parallel interface (spi) bus architectures. for the se termination, one regulator and nine precision 110ohm resistors are used. for the lvd termination, the g218b integrates 18 regulated supplies with nine precision resistor strings. pin configuration r1- r1+ r2- nc/hs gnd r3+ r3- r4+ r4- r5+ r5- discnct gnd tpwr r9- r9+ r8+ r8- r7- r6- r6+ diffb diffsense m/s 28pin ssop/tssop vref r2+ tpwr r7+ g218b 1 2 3 4 28 27 26 25 5 6 7 8 9 10 11 12 13 14 24 23 22 21 20 19 18 17 16 15 nc/hs gnd nc nc r1+ r1- r2- hs/gnd hs/gnd r3+ r3- r4+ r4- r5+ r5- discnct gnd tpwr hvd lvd se r9- r9+ r8- r8+ hs/gnd hs/gnd hs/gnd r7- r7+ r6- r6+ diffb diffsense m/s vref r2+ hs/gnd 36pin ssop g218b 1 2 3 4 28 27 26 25 5 6 7 8 9 10 11 12 13 14 24 23 22 21 20 19 16 17 15 18 33 32 31 30 29 36 35 34 r1- r1+ r2- nc/hs gnd r3+ r3- r4+ r4- r5+ r5- discnct gnd tpwr r9- r9+ r8+ r8- r7- r6- r6+ diffb diffsense m/s 28pin ssop/tssop vref r2+ tpwr r7+ g218b 1 2 3 4 28 27 26 25 5 6 7 8 9 10 11 12 13 14 24 23 22 21 20 19 18 17 16 15 nc/hs gnd r1- r1+ r2- nc/hs gnd r3+ r3- r4+ r4- r5+ r5- discnct gnd tpwr r9- r9+ r8+ r8- r7- r6- r6+ diffb diffsense m/s 28pin ssop/tssop vref r2+ tpwr r7+ g218b 1 2 3 4 28 27 26 25 5 6 7 8 9 10 11 12 13 14 24 23 22 21 20 19 18 17 16 15 nc/hs gnd nc nc r1+ r1- r2- hs/gnd hs/gnd r3+ r3- r4+ r4- r5+ r5- discnct gnd tpwr hvd lvd se r9- r9+ r8- r8+ hs/gnd hs/gnd hs/gnd r7- r7+ r6- r6+ diffb diffsense m/s vref r2+ hs/gnd 36pin ssop g218b 1 2 3 4 28 27 26 25 5 6 7 8 9 10 11 12 13 14 24 23 22 21 20 19 16 17 15 18 33 32 31 30 29 36 35 34
ver 1.3 jul 19, 2002 tel: 886-3-5788833 http://www.gmt.com.tw 2 g218b global mixed-mode technology inc. ordering information part number temp. range pin-package feature g218bt-s4 0oc-70oc ssop-28 pin / tube discnct does not disable vref g218br-s4 0oc-70oc ssop-28 pin / tape & reel discnct does not disable vref g218bt-s5 0oc-70oc ssop-36 pin / tube discnct does not disable vref g218br-s5 0oc-70oc ssop-36 pin / tape & reel discnct does not disable vref G218BT-D3 0oc-70oc tssop-28 pin / tube discnct does not disable vref g218br-d3 0oc-70oc tssop-28 pin / tape & reel discnct does not disable vref note: diffsens ? refers to the scsi bus signal. diffsense ? refers to the g218b pin name and internal circuitry relating to differential sensing. diffb ? refers to the g218b pin name and internal circuitry relating to monitoring the diffsens line. functional description the g218b is used in multi-mode active termination applications, where single ended (se) and low voltage differential (lvd) devices might coexist. the lvd ter- mination section consists of 18 source/sink amplifiers (vtop, vbot), biasing circuitry and nine precision resistor strings (rtop, rmid, rbot). the se termi- nation section consists of a 2.85v source/sink regula- tor with 9 precision 110ohm resistor. the diffsense section consists of a 1.3v, 5ma driver and a sensing circuit (figure 1) diffsens is used to identify which types of scsi devices are present on the bus. if the voltage on diffsens is between 0-0.5v the bus is single-ended; if it is between 0.7-1.9v the bus is lvd; and if it is greater than 2.4v, the bus is hvd. the g218b diffb pin monitors the diffsens line to determine the proper operating mode of the device; this mode is indicated by the se/lvd/hvd outputs. hvd isolation mode the g218b identifies that there is an hvd (high voltage differential) device on the scsi bus and isolates the termination pins from the bus. when discnct is pulled high, the termination pins are isolated from the scsi bus, and the bus mode indicators (se/lvd/hvd) as well as vref remains active. during thermal shutdown, the termination pins are isolated from the scsi bus and vref becomes high impedance. the diffsense driver is shut down during either of these two events. to ensure proper operation, the tpwr pin should be connected to the scsi bus termpwr line. as with all analog circuitry, the termpwr lines should be by- passed locally. a 2.2f capacitor and a 0.01f high frequency capacitor is recommended between tpwr and ground and placed as close as possible to the g218b. the g218b should be placed as close as possible to the scsi connector to minimize signal and power trace length, thereby resulting in less input ca- pacitance and reflections which can degrade the bus signals. the diffsense pin can drive the scsi diffsens line (when m/s is pulled high) to determine the scsi bus operating mode. the g218b switches to the ter- mination mode that is appropriate for the bus based on the value of the diffsens voltage. these modes are: lvd mode lvd termination is provided by a precision resistor string with two amplifiers. this configuration yields a 105 ? differential and 150 ? common mode impedance. a fail safe bias of 112mv is maintained when no drivers are connected to the scsi bus. se mode when the external driver for a given signal line turns off, the active terminator will pull that signal line to 2.85 volts (quiescent state). when used with an active negation driver, the power amp can sink 22ma per line while keeping the voltage reference in regula- tion. the terminating resistors maintain their 110 ? value. to maintain the specified regulation, a 4.7f capacitor is required between the vref pin and ground of each g218b. a high frequency cap (0.1f ceramic recom- mended) can also be placed on the vref pin in ap- plications that use fast rise/fall time drivers. a typical scsi bus configuration is shown in figure2. an internal pull down resistor assures that the g218b will be terminating the bus if the discnct pin is left floating.
ver 1.3 jul 19, 2002 tel: 886-3-5788833 http://www.gmt.com.tw 3 g218b global mixed-mode technology inc. block diagram (figure 1) diffb diffsense se lvd hv d therma l shutdown circuitry discnct co nt rol logic vref diffsense circuitry reference genera tio n vref 110 ohms 110 ohms r1- r9- vtop1 rto p1 rmid1 rbo t1 r1+ r1- r9- r9+ r1- r9- se gnd driv er vbot1 r1+ r9+ 36pin ssop only + _ + _ ( ) x 9 x 9 rto p9 rmid9 rbo t9 m/ s diffb diffsense se lvd hv d therma l shutdown circuitry discnct co nt rol logic vref diffsense circuitry reference genera tio n vref 110 ohms 110 ohms r1- r9- vtop1 rto p1 rmid1 rbo t1 r1+ r1- r9- r9+ r1- r9- se gnd driv er vbot1 r1+ r9+ 36pin ssop only + _ + _ + _ + _ ( ) x 9 x 9 rto p9 rmid9 rbo t9 m/ s
ver 1.3 jul 19, 2002 tel: 886-3-5788833 http://www.gmt.com.tw 4 g218b global mixed-mode technology inc. scsi bus configuration (figure 2) g218b g218b g218b g218b tpwr m/s discnct diffsense control lines (9) diffsens tpwr termpwr 20k vref diffb 0.1f diffsense diffb vref termpwr tpwr m/s discnct diffb vref tpwr diffb vref tpwr data lines (9) vref diffb tpwr vref diffb data lines (9) g218b g218b 2.2f 2.2f 2.2f 2.2f 2.2f 2.2f m/s discnct m/s discnct m/s discnct m/s discnct 4.7f 4.7f 4.7f 4.7f 4.7f 4.7f 0.1f 20k g218b g218b g218b g218b tpwr m/s discnct diffsense control lines (9) diffsens tpwr termpwr 20k vref diffb 0.1f diffsense diffb vref termpwr tpwr m/s discnct diffb vref tpwr diffb vref tpwr data lines (9) vref diffb tpwr vref diffb data lines (9) g218b g218b 2.2f 2.2f 2.2f 2.2f 2.2f 2.2f m/s discnct m/s discnct m/s discnct m/s discnct 4.7f 4.7f 4.7f 4.7f 4.7f 4.7f 0.1f 20k g218b g218b g218b g218b tpwr m/s discnct diffsense control lines (9) diffsens tpwr termpwr 20k vref diffb 0.1f diffsense diffb vref termpwr tpwr m/s discnct diffb vref tpwr diffb vref tpwr data lines (9) vref diffb tpwr vref diffb data lines (9) g218b g218b 2.2f 2.2f 2.2f 2.2f 2.2f 2.2f m/s discnct m/s discnct m/s discnct m/s discnct 4.7f 4.7f 4.7f 4.7f 4.7f 4.7f 0.1f 20k
ver 1.3 jul 19, 2002 tel: 886-3-5788833 http://www.gmt.com.tw 5 g218b global mixed-mode technology inc. recommended operating conditions parameter symbol min typ max units v tpwr (se) 4.0 5 5.5 termpower voltage v tpwr (lvd) 2.9 5 5.5 v logic 0 v il -0.3 +0.8 v logic 1 v ih 2.0 v tpwr +0.3 v operating temperature t amb 0 70 c electrical characteristics unless otherwise specified, these specifications apply over the operating ambient temperature range of 0c t a 70c. parameter symbol condition min typ max units lvd terminator section differential mode termination resistance rdm 100 105 110 ohms common mode termination resistance rcm 110 150 190 ohms differential mode bias vdm all lines open 100 112 125 mv common mode bias vcm 1.125 1.25 1.375 v single ended terminator section output capacitance cout note 3 pf se termination resistance rse vline = 0-3.0 volts 104.5 110 115.5 ohms se voltage reference vref 2.79 2.85 2.93 volts se output current iose vline = 0.2 volts 25.4 ma regulator section line regulation li reg 1.0 2.5 % load regulation lo reg 1.3 3.5 % current limit i lim 350 ma sink current i sink 200 ma dc section se mode (no load) 4 termpower current i tpmr lvd mode (no load) 20 ma input leakage high i ih -1.0 a input leakage low i il 1.0 a output current high i oh v out = 2.4 volts;se/lvd/hvd pins only -1.0 ma output current low i ol v out =0.4 volts;se/lvd/hvd pins only 4.0 ma diffsens section diffsens se operating range v seor -0.3 0.5 v diffsens lvd operating range v lvdor 0.7 1.9 v diffsens hvd operating range v hvdor 2.4 v tpwr +0.3 v diffsense driver output voltage v dso m/s=1; i ds = 0-5ma 1.2 1.4 v diffsense driver source current i dsh m/s = 1; v dso =0v 5 15 ma diffsense driver sink current i dsl m/s=1; v dso =2.75v 20 200 a note: guaranteed by design .
ver 1.3 jul 19, 2002 tel: 886-3-5788833 http://www.gmt.com.tw 6 g218b global mixed-mode technology inc. typical operating characteristics common mode bias vcm - vtpwr 1.125 1.175 1.225 1.275 1.325 1.375 2.5 3.5 4.5 5.5 vtpwr vcm(v) common mode bias vcm - temperature 1.125 1.175 1.225 1.275 1.325 1.375 -20 0 20 40 60 80 100 temperature( ) vcm(v) common mode termination resistance rcm - temperature@vtpwr=5v 110 120 130 140 150 160 170 180 190 -20 0 20 40 60 80 100 temperature(oc) rcm(ohm) common mode termination resistance rcm - vtpwr@temperature=24oc 110 120 130 140 150 160 170 180 190 2.5 3.5 4.5 5.5 vtpwr rcm(ohm) differential mode termination resistance rdm - vtpwr 100 102 104 106 108 110 2.5 3.5 4.5 5.5 vtpwr rdm(ohm) differential mode termination resistance rdm - temperature 100 102 104 106 108 110 -20 0 20 40 60 80 100 temperature(oc) rdm(ohm) differential mode bias vdm - temperature @vtpwr=5v 0.1 0.105 0.11 0.115 0.12 0.125 -20 0 20 40 60 80 100 temperature(oc) vdm(v) differential mode bias vdm - vtpwr 0.1 0.105 0.11 0.115 0.12 0.125 2.5 3.5 4.5 5.5 vtpwr vdm(v) t=80oc t=-10oc v tpwr =5.8v v tpwr =2.8v t=80oc t=-10oc v tpwr =2.8v v tpwr =5.8v t=-10oc t=80oc
ver 1.3 jul 19, 2002 tel: 886-3-5788833 http://www.gmt.com.tw 7 g218b global mixed-mode technology inc. se termination resistance rse - vtpwr @t=24oc;vline=0v 105 106 107 108 109 110 111 112 113 114 115 3.5 4.5 5.5 vtpwr rse(ohm) se termination resistance rse - vtpwr @vline=0v 105 106 107 108 109 110 111 112 113 114 115 -20 0 20 40 60 80 100 temperature(oc) rse(ohm) se termination resistance rse - vtpwr @vtpwr=5v;t=24oc 105 106 107 108 109 110 111 112 113 114 115 0123 vline rse(ohm) vref - ivref@vtpwr=5v;t=24oc 2.79 2.81 2.83 2.85 2.87 2.89 2.91 2.93 -250 -150 -50 50 150 250 350 ivref(ma) vref vref - temperature@ivref=0ma 2.79 2.81 2.83 2.85 2.87 2.89 2.91 2.93 -20 0 20 40 60 80 100 temperature(oc) vref vref - vtpwr@t=24oc 2.79 2.81 2.83 2.85 2.87 2.89 2.91 2.93 3.5 4.5 5.5 6.5 vtpwr vref v tpwr =3.8v v tpwr =5.8v v tpwr =5.8v v tpwr =3.8v i vref =350ma i vref =-200ma
ver 1.3 jul 19, 2002 tel: 886-3-5788833 http://www.gmt.com.tw 8 g218b global mixed-mode technology inc. pin description (for 28pin ssop/tssop) pin symbol description 1 vref* reference voltage. 2.85-volt reference; must be connected to a 4.7f capacitor. 2-5,7-12, 18-21, 23-26 rx+, rx- signal termination. (x=1,2,3,?..9) rx+: ground line for single-ended or positive line for differential applications for the scsi bus. rx-: signal line/active line for single-ended or negative line in differential applications for the scsi bus. 6,22 nc/ hs gnd no connect/ hs gnd. should be grounded for heat sinking purpose. 13 discnct disconnec t. when pulled high, the g218b isolates its bus pins (rx+, rx-) from the scsi bus. 14 gnd ground. terminator ground pin. connected to ground. 15 m/s master/slave. used to select which terminator is the controlling device. m/s pin high enables the diffsense driver. 16 diffsense output to drive the scsi bus diffsens line. 17 diffb diffb pin should be connected to a 0.1f capacitor to gnd and 20k resistor to scsi/bus diffsens line. an input pin to detect the type of device (differential or single-ended) on the scsi bus. 27,28 tpwr terminator power. connect to the scsi termpwr line and de-couple with a 2.2f capacitor. *the vref keeps the level at 2.85 volt, despite the discnct pin is asserted or not; even the termination mode is changed. (36pin ssop) pin symbol description 1 vref* reference voltage. 2.85-volt reference; must be connected to a 4.7f capacitor. 2,3 nc no connect. do not connect these pins. 4-7,11-16, 22-25, 29-32 rx+ rx- signal termination. (x=1,2,3,?..9) rx+: ground line for single-ended or positive line for differential applications for the scsi bus. rx-: signal line/active line for single-ended or negative line in differential applications for the scsi bus. 8, 9,10,26, 27,28 hs/gnd heat sink ground. connect to large area pc board traces to increase power dissipation capabil- ity. 17 discnct disconnec t. when pulled high, the g218 isolates its bus pins (rx+, rx-) from the scsi bus. 18 gnd ground. terminator ground pin. connected to ground. 19 m/s master/slave. used to select which terminator is the controlling device. m/s pin high enables the diffsense driver. 20 diffsense output to drive the scsi bus diffsens line. 21 diffb diffb pin should be connected to a 0.1f capacitor to gnd and 20k resistor to scsi/bus diffsens line. an input pin to detect the type of device (differential or single-ended) on the scsi bus. 33 se single ended mode indicator. it is high when terminator is operating in se mode. 34 lvd low voltage differential mode indicator. it is high when terminator is operating in lvd mode. 35 hvd high voltage differential mode indicator. it is high when terminator is operating in hvd mode 36 tpwr terminator power. connect to scsi bus termpwr line and decouple with 2.2f capacitor. *the vref keeps the level at 2.85 volt, despite the discnct pin is asserted or not; even the termination mode is changed.
ver 1.3 jul 19, 2002 tel: 886-3-5788833 http://www.gmt.com.tw 9 g218b global mixed-mode technology inc. package information (28 pin ssop) dimension in mm dimension in inch symbol min. typ. max. min. typ. max. a 1.35 1.60 1.75 0.053 0.064 0.069 a1 0.10 ----- 0.25 0. 004 ----- 0. 010 a2 ----- 1.45 ----- ----- 0. 057 ----- b 0.20 0.25 0.30 0.008 0.010 0.012 c 0.19 ----- 0.25 0. 007 ----- 0. 010 d 9.80 ----- 10.00 0. 386 ----- 0. 394 e 5.80 ----- 6.20 0. 228 ----- 0. 244 e1 3.80 ----- 4.00 0. 150 ----- 0. 157 e ----- 0.64 ----- ----- 0. 025 ----- l 0.40 ----- 1.27 0. 016 ----- 0. 050 y ----- ----- 0.10 ----- ----- 0. 004 0o ----- 8o 0o ----- 8o 28 e1 e d 1 e b a a1 a2 c 1.00 ref l 0.25
ver 1.3 jul 19, 2002 tel: 886-3-5788833 http://www.gmt.com.tw 10 g218b global mixed-mode technology inc. 36 pin ssop dimension in mm dimension in inch symbol min. typ. max. min. typ. max. a 2.413 2.591 2.794 0.095 0.102 0.110 a1 0.203 0.305 0.406 0.008 0.012 0.016 b 0.300 0.450 0.012 0.018 c 0.127 0.254 0.005 0.010 d 15.748 15.875 16.002 0.620 0.625 0.630 e 0.800 basic 0.032 basic e 10.033 10.668 0.395 0.420 e1 7.391 7.493 7.595 0.291 0.295 0.289 h 0.381 0.635 0.015 0.025 l 0.508 1.016 0.020 0.040 0 8 0 8 h x 45 c l e1 e seating plane 0.004 c d b e a a1
ver 1.3 jul 19, 2002 tel: 886-3-5788833 http://www.gmt.com.tw 11 g218b global mixed-mode technology inc. 28 pin tssop note: 1. package body sizes exclude mold flash protrusions or gate burrs 2. tolerance 0.1mm unless otherwise specified 3. coplanarity : 0.1mm 4. controlling dimension is in millimeter. converted inch dimensions are not necessarily accurate. 5. follow jedec mo-153 dimension in mm dimension in inch symbol min. nom. max. min. nom. max. a ----- ----- 1.20 ----- ----- 0. 048 a1 0.05 ----- 0.15 0. 002 ----- 0. 006 a2 0.80 1.00 1.05 0.031 0.039 0.041 b 0.19 ----- 0.30 0. 007 ----- 0. 012 c 0.09 ----- 0.20 0. 004 ----- 0. 008 d 9.60 9.70 9.80 0.378 0.382 0.386 e ----- 6.40 ----- ----- 0. 252 ----- e1 4.30 4.40 4.50 0.169 0.173 0.177 e ----- 0.65 ----- ----- 0. 026 ----- l 0.45 0.60 0.75 0.018 0.024 0.030 y ----- ----- 0.10 ----- ----- 0. 004 0o ----- 8o 0o ----- 8o taping specification gmt inc. does not assume any res ponsibility for use of any circuitry described, no circuit patent licenses are implied and gmt inc. reserves the right at any t ime without notice to change said circuitry and specifications. 28 e1 e d 1 b a a1 a2 c l e feed direction typical ssop, tssop package orientation feed direction typical ssop, tssop package orientation

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