MIC2592A Dual-Slot PCI Express Hot-Plug Controller - Micrel - #9

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March 2005 9 M9999-033105 MIC2592B Micrel Electrical Characteristics (continued)(7) Symbol Parameter Condition Min Typ Max Units IAUX(THRESH) Auxiliary Output Current Limit Current which must be drawn from 0.84 A Threshold (Figure 4) V AUX(VAUX to register as a fault ISC(TRAN) Maximum Transient Short Circuit VAUX Enabled, then Grounded Current I V MAX R STBY[A/B] DS(AUX) ƒ­ A ILIM(AUX) Regulated Current after Transient From end of ISC(TRAN) to CFILTER time-out 0.375 0.7 1.35 A Output Discharge Resistance RDIS(12V) 12VOUT[A/B] 12VOUT[A/B] = 6.0V 1600 Ù RDIS(3V) 3VOUT[A/B] 3V DIS(OUT[A/B] = 1.65V 150 Ù RDIS(VAUX) 3VAUX[A/B] 3VAUX[A/B] = 1.65V 430 Ù tOFF(12V) 12V Current Limit Response Time MIC2592B-2BTQ 1 2.0 ìs (Figure 2) C OFF(GATE = 25pF VIN –VSENSE = 140mV tOFF(3V) 3.3V Current Limit Response Time MIC2592B-2BTQ 1 2.0 ìs (Figure 3) C OFF(GATE = 25pF VIN –VSENSE = 140mV(8) tSC(TRAN) VAUX[A/B] Current Limit Response VAUX[A/B] = 0V, VSTBYA = VSTBYB = +3.3V 2.5 5 ìs Time (Figure 5) SC(tPROP(12VFAULT) Delay from 12V[A/B] Overcurrent MIC2592B-2BTQ 1 ìs Limit to /FAULT output C PROP(FILTER = 0 VIN –VSENSE = 140mV(8) tPROP(3VFAULT) Delay from 3V[A/B] Overcurrent MIC2592B-2BTQ 1 ìs Limit to /FAULT[A/B] Output C PROP(FILTER = 0 VIN –VSENSE = 140mV(8) tPROP(VAUXFAULT) Delay from VAUX[A/B] Overcurrent MIC2592B-2BTQ 1 ìs limit to /FAULT[A/B] output PROP(CFILTER = 0 VAUX Output Grounded(8) tW ON[A/B], AUXEN[A/B] Pulse Width Note 8 100 ns tPOR MIC2592B Power-On Reset Time Note 8 250 ìs after VSTBY[A/B] becomes valid SMBus Timing t1 SCL (clock) period Figure 1 2.5 ìs t2 Data In setup time to SCL HIGH Figure 1 100 ns t3 Data Out stable after SCL LOW Figure 1 300 ns t4 Data LOW setup time to SCL LOW Start condition, Figure 1 100 ns t5 Data HIGH hold time after SCL HIGH Stop condition, Figure 1 100 ns Notes: 7. Specifi cation for packaged product only. 8. Parameters guaranteed by design. Not 100% production tested. V I 12V 3V V V V V V C V