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74LVCC3245ADBQRG4 데이터시트(PDF) 6 Page - Texas Instruments |
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74LVCC3245ADBQRG4 데이터시트(HTML) 6 Page - Texas Instruments |
6 / 18 page www.ti.com Switching Characteristics Operating Characteristics Power-Up Considerations(1) SN74LVCC3245A OCTAL BUS TRANSCEIVER WITH ADJUSTABLE OUTPUT VOLTAGE AND 3-STATE OUTPUTS SCAS585O – NOVEMBER 1996 – REVISED MARCH 2005 over recommended operating free-air temperature range (unless otherwise noted) (see Figure 1 through Figure 4) VCCA = 2.5 V VCCA = 2.7 V TO VCCA = 2.7 V TO ± 0.2 V, 3.6 V, 3.6 V, FROM TO VCCB = 3.3 V VCCB = 5 V VCCB = 3.3 V PARAMETER UNIT (INPUT) (OUTPUT) ± 0.3 V ± 0.5 V ± 0.3 V MIN MAX MIN MAX MIN MAX tPHL 1 9.4 1 6 1 7.1 A B ns tPLH 1 9.1 1 5.3 1 7.2 tPHL 1 11.2 1 5.8 1 6.4 B A ns tPLH 1 9.9 1 7 1 7.6 tPZL 1 14.5 1 9.2 1 9.7 OE A ns tPZH 1 12.9 1 9.5 1 9.5 tPZL 1 13 1 8.1 1 9.2 OE B ns tPZH 1 12.8 1 8.4 1 9.9 tPLZ 1 7.1 1 7 1 6.6 OE A ns tPHZ 1 6.9 1 7.8 1 6.9 tPLZ 1 8.8 1 7.3 1 7.5 OE B ns tPHZ 1 8.9 1 7 1 7.9 V CCA = 3.3 V, VCCB = 5 V, TA = 25°C PARAMETER TEST CONDITIONS TYP UNIT Outputs enabled 38 Cpd Power dissipation capacitance per transceiver CL = 50, f = 10 MHz pF Outputs disabled 4.5 TI level-translation devices offer an opportunity for successful mixed-voltage signal design. A proper power-up sequence always should be followed to avoid excessive supply current, bus contention, oscillations, or other anomalies caused by improperly biased device pins. To guard against such power-up problems, take these precautions: 1. Connect ground before any supply voltage is applied. 2. Power up the control side of the device (VCCA for all four of these devices). 3. Tie OE to VCCA with a pullup resistor so that it ramps with VCCA. 4. Depending on the direction of the data path, DIR can be high or low. If DIR high is needed (A data to B bus), ramp it with VCCA. Otherwise, keep DIR low. (1) Refer to the TI application report, Texas Instruments Voltage-Level-Translation Devices, literature number SCEA021. 6 |
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