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MAX3948 Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX3948 Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 37 page ����������������������������������������������������������������� Maxim Integrated Products 5 MAX3948 11.3Gbps, Low-Power, DC-Coupled Laser Driver ELECTRICALCHARACTERISTICS(continued) (VCC = VCCT = 2.95V to 3.63V, TA = -40NC to +95NC; typical values are at VCC = VCCT = 3.3V, TA = +25NC, LDDC = 20mA, LDMOD = 40mA, and 14I single-ended electrical output load, unless otherwise noted. See Figure 1 for electrical setup.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS TIMINGREQUIREMENTS(Notes5,6,8) Initialization Time tINIT LDDC = 25mA, LDMOD = 65mA, DC and modulation DAC are both H0x00, time from TX_EN = high to LDDC and LDMOD at 90% of steady state 250 ns DISABLE Assert Time tOFF Time from rising edge of DISABLE input signal to LDDC and LDMOD at 10% of steady state (Note 6) 25 75 ns DISABLE Negate Time tON Time from falling edge of DISABLE to LDDC and LDMOD at 90% of steady state (Note 6) 250 600 ns FAULT Reset Time tRECOVER Time from negation of latched fault using DISABLE to LDDC and LDMOD at 90% of steady state 250 600 ns FAULT Assert Time tFAULT Time from fault to FAULT = high, CFAULT ≤ 20pF, RFAULT = 4.7kW 0.7 3 F s DISABLE to Reset Time Time DISABLE must be held high to reset fault 4 F s DIGITALI/OSPECIFICATIONS(SDA,SCL,CSEL,FAULT,DISABLE) Input High Voltage VIH 1.8 VCC V Input Low Voltage VIL 0 0.8 V Input Hysteresis VHYST 80 mV Input Capacitance CIN 5 pF DISABLE Input Resistance RPULL Internal pullup resistor 4.7 7.5 10 kI Input Leakage Current (DISABLE) IIH Input connected to VCC 10 F A IIL Input connected to GND 440 775 Input Leakage Current (SDA) IIH Input connected to VCC -2 +2 F A IIL Input connected to GND; internal pullup is 75k W typical 35 75 Input Leakage Current (SCL, CSEL) IIH Input connected to VCC; internal pulldown is 75k W typical 35 75 F A IIL Input connected to GND -2 +2 Output High Voltage (SDA, FAULT) VOH External pullup is (4.7kI to 10kI) to VCC VCC - 0.1 V Output Low Voltage (SDA, FAULT) VOL External pullup is (4.7kI to 10kI) to VCC 0.4 V |
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