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PI74LVC4245AS датащи(PDF) 5 Page - Pericom Semiconductor Corporation |
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PI74LVC4245AS датащи(HTML) 5 Page - Pericom Semiconductor Corporation |
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5 / 9 page ![]() PI74LVC4245A 8-Bit Dual Supply Bus Transceiver with 3-State Outputs 5 P-0.2 08/11/03 ADVANCE INFORMATION Parameters From (Input) To (Output) VCCA =5V ± 0.5V,VCCB = 2.7V to 3.6V Units CL = 50pF, RL = 500Ω Min. Max. tPHL A B 1 5.7 ns tPLH 1 5.5 tPHL B A 1 6.1 tPLH 1 5.9 tPZL OE A 1 8 tPZH 1 7.6 tPZL OE B 1 8 tPZH 1 7.7 tPLZ OE A 1 6.2 tPHZ 1 5.8 tPLZ OE B 1 7 tPHZ 1 6.8 tSK(O) Output-to-Output Skew(8) 1.5 AC Electrical Characteristics (Over Recommended Operating Free-Air Temperature Range unless otherwise noted, See Figure 1 and 2) Power- Up Considerations To avoid excessive supply current, bus contention or oscillation during power-up, the following guidelines should be followed: 1. Connect ground first before any supply voltage is applied. 2. Then Power up VCCA, which is the control side of the device. 3. Ramp OE ahead of or with VCCA to help prevent bus contention 4. Ramp DIR with VCCA if DIR HIGH is needed (A bus to B bus). Otherwise keep DIR LOW. Note: 8. Skew between any two outputs of the same device, switching in the same direction. Parameter guaranteed by design. |
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