BH9595FP-Y multimedia ics 1/7 scsi active terminator BH9595FP-Y these scsi active terminators, developed as a substitute for conventional discrete terminators, maintain good consistency between vm level (2.85v) and gnd level (0v) and between vm level and vdd level, and have extremely low power consumption, dropping to a maximum of 90 milliwatts at standby (compared to the maximum of 990 milliwatts used by conventional resistance terminators ). these scsi active terminators electrically control scsi lines, connecting and disengaging the terminating resistor by electrically controlling the enable pin. ! ! ! ! application pc and peripheral appliances, oa appliances, disk drive appliances ! ! ! ! features 1) internal 2.85v power supply and push-pull operation, for good consistency at all signal levels. 2) enable pin for terminator enabling and disconnecting, facilitating scsi network construction. 3) low power consumption, ideal for energy-saving systems. power consumption (during standby) scisi active terminators : 90mw conventional resistor terminators : 990mw power consumption (25% duty) scisi active terminators : 614mw conventional resistor terminators : 15/190mw significant reductions in power consumption are possible by using this terminator. 4) wide operating range. term power : 4.0 5.5v (transient : 6.0v) 5) thin, microminiature design, ideal for space-saving applications. package body size : 13.6 5.4 1.9mm 6) active termination of 18-line scsi. 7) internal thermal shutdown circuit. 8) compatibility with scsi-i and scsi-ii. ! ! ! ! absolute maximum ratings (ta = 25 c) parameter symbol limits unit operating temperature operating temperature topr tstg 1.45 c c ? 1 drain current (from module to scsi line) / line ? 2 sick current (from scsi line to module) / line ? 3 when mounted to a 90mm 50mm 1.6mm galass epoxy board 0~ + 75 ? 55~ + 125 power dissipation ? 3 pd power supply voltage dc output current ? 1 dc output current ? 2 input voltage v dd1 i sld i sls vi ? 0.3~ + 7.0 ? 30 35 ? 0.3~(v dd1 + 0.3) v ma ma v w
BH9595FP-Y multimedia ics 2/7 ! ! ! ! recommended operating conditions (ta = 25 c) parameter symbol unit max. typ. min. scsi line voltage ? transient 6v v slx ? 0.3 ? v dd1 + 0.3 v power supply voltage v dd1 4.0 4.5 5.5 ? v inout voltage (high) v ih v dd1 ? 0.6 ? v dd1 + 0.6 v inout voltage (low) v il ? 0.3 ? 0.8 v ! ! ! ! block diagram 25 24 23 22 21 20 19 18 17 16 15 14 1 2 3 4 5 6 8 9 10 11 12 13 7 mode control 2.85v generater tsd tsd not to be used (n.c.) "h" : enable "l" : disconnect en scsi line 15 scsi line 16 scsi line 17 scsi line 18 gnd gnd scsi line 1 scsi line 2 scsi line 3 scsi line 4 scsi line 5 v dd1 vm scsi line 14 scsi line 13 scsi line 12 scsi line 11 gnd scsi line 10 scsi line 9 scsi line 8 scsi line 7 scsi line 6 v dd1 pow to sw pullup-r 50k ? pow (push-pull) (push-pull) (push-pull) (push-pull) (push-pull) (push-pull) 110 ? resistors pow pow pow pow pow pow pow 2.85v supply shottky barrier diodes (trmpwr) 2.2 0.1 system power 5.0v
BH9595FP-Y multimedia ics 3/7 ! ! ! ! pin descriptions pin no. pin name pin description 1 2 3 4 5 6 - - 7 8 9 10 11 12 13 14 15 16 17 18 19 - - 20 21 22 23 24 25 (n.c.) not to be used en scsi line 15 scsi line 16 scsi line 17 scsi line 18 gnd gnd scsi line 1 scsi line 2 scsi line 3 scsi line 4 scsi line 5 v dd1 v dd1 scsi line 6 scsi line 7 scsi line 8 scsi line 9 scsi line 10 gnd scsi line 11 scsi line 12 scsi line 13 scsi line 14 vm tsd enable pin scsi terminator node scsi terminator node scsi terminator node scsi terminator node gnd gnd scsi terminator node scsi terminator node scsi terminator node scsi terminator node scsi terminator node terminator power-supply pin (to/from) terminator power-supply pin (to/from) scsi terminator node scsi terminator node scsi terminator node scsi terminator node scsi terminator node gnd scsi terminator node scsi terminator node scsi terminator node scsi terminator node 2.85v node thermal shutdown output pin assignment table (hsop-25)
BH9595FP-Y multimedia ics 4/7 ! ! ! ! input / output circuits scsi line potential v dd1 level 2.85v gnd level ? 5.5v ? 2.85v 0v t = 50ns ? vm td1 td1 td2 ts1 ts1 ? vm ts1 ? vm td2 ? vm ts2 vm scsi active terminator v dd1 scsi line no.1 no.18 same voltage as v dd1 vm + ? + ? fig.1
BH9595FP-Y multimedia ics 5/7 ! ! ! ! electrical characteristics (ta = 25 c) parameter symbol min. typ. max. unit conditions i il i ih i slz i slss i slsd vm i ddstb i sls i sld r sl pc ? vm td1 td1 ? vm td2 td2 ? vm ts1 ts1 ? vm ts2 ts2 50 ? 1 ? 1 15 7 2.700 ? 300 300 105 ? 100 ? ? 100 ? ? 100 ? ? 100 ? 110 ? ? 25 20 2.85 1.0 ? ? ? 5.0 ? ? ? ? ? ? ? ? ?? dc characteristics ?? input leakage current scsi line leakage current scsi line short current ? 1 scsi line short current ? 2 vm voltage standby current ? 1 scsi total sink current scsi total drain current scsi equivalent resistance pin capacity ? 3 ?? transient characteristics ?? load transient voltage 2.85v gnd load transient 1/10 decay time 2.85v gnd load transient voltage gnd 2.85v load transient 1/10 decay time gnd 2.85v load transient voltage 2.85v v dd1 load transient 1/10 decay time 2.85v v dd1 load transient voltage v dd1 2.85v load transient 1/10 decay time v dd1 2.85v 200 1 1 30 30 3.000 2.0 550 550 115 6.0 + 100 + 100 + 100 + 100 + 100 + 100 + 100 + 100 a a a ma ma v ma ma ma ? pf mv s mv s mv s mv s vi = gnd v dd1 = 5.5v vi = v dd1 v dd1 = 5.5v en = gnd v dd1 = 5.5v en = v dd1 , scsi line = gnd, 4.0 v dd1 5.5v en = v dd1 , scsi line = v dd1 , 4.0 v dd1 5.5v 4.0 v dd1 5.5v en = gnd, 4.0 v dd1 5.5v en = v dd1 , 18 scsi line = gnd, 4.0 v dd1 5.5v en = v dd1 , 18 scsi line = v dd1 , 4.0 v dd1 5.5v en = v dd1 , scsi line : v dd1 = 4.7v en = gnd en = v dd1 4.0 v dd1 5.5v all scsi lines : 2.85v gnd level en = v dd1 4.0 v dd1 5.5v all scsi lines : 2.85v gnd level en = v dd1 4.0 v dd1 5.5v all scsi lines : gnd 2.85v level en = v dd1 4.0 v dd1 5.5v all scsi lines : gnd 2.85v level en = v dd1 4.0 v dd1 5.5v all scsi lines : 2.85v v dd1 level en = v dd1 4.0 v dd1 5.5v all scsi lines : 2.85v v dd1 level en = v dd1 4.0 v dd1 5.5v all scsi lines : v dd1 2.85v level en = v dd1 4.0 v dd1 5.5v all scsi lines : v dd1 2.85v level ? 1 drain current (from module to scsi line) / line ? 2 sink current (from scsi line to module) / line ? 3 the transient chracteristics are guaranteed design values.
BH9595FP-Y multimedia ics 6/7 ! ! ! ! application example 2.2 2.2 v dd1 en en vm vm gnd gnd v dd1 scsi active terminator scsi active terminator no.18 no.18 no.1 scsi data lines termpwr line scsi line no.1 scsi line system power system power fig.2
BH9595FP-Y multimedia ics 7/7 ! ! ! ! operation notes 1. requirement of mounting design (1) thermal reduction curve 0 0.50 1.00 1.50 1.45w 64% 25 50 75 100 125 150 pd [w] ta [ c] ? when mounted on a 90 50 1.6 (mm) glass epoxy board. ? reduced by 11.6mw for each increase in ta of 1 c over ta = 25 c. fig.3 1) can withstand continuous use 64% duty, at 25 c. (2) electrical characteristics 1) please note to make grand impedance as low as possible because this terminator can operate in even high- frequency range. 2) please connect the 2.2 f by-pass capacitor between v dd1 pin (termpwr) and gnd. 3) capacitor is not necessary for vm pin. 4) pull up-r (50k ? ) is incorporated in en pin. refer to the application circuit. 2. protection circuit (1) thermal shutdown 1) all outputs are opened at 175 c (typically). 2) temperature hysteresis is approximately 20 c. 3) thermal shutdown output table. ! ! ! ! external dimensions (units : mm) hsop25 7.8 0.3 5.4 0.2 2.75 0.1 1.95 0.1 25 14 1 13 0.11 1.9 0.1 0.36 0.1 0.3min. 0.25 0.1 13.6 0.2 0.8 0.1
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