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74LVC245A Scheda tecnica(PDF) 2 Page - NXP Semiconductors |
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74LVC245A Scheda tecnica(HTML) 2 Page - NXP Semiconductors |
2 / 20 page 2003 May 07 2 Philips Semiconductors Product specification Octal bus transceiver with direction pin with 5 V tolerant input/outputs (3-state) 74LVC245A; 74LVCH245A FEATURES • 5 V tolerant inputs/outputs for interfacing with 5 V logic • Wide supply voltage range from 1.2 to 3.6 V • CMOS low power consumption • Direct interface with TTL levels • Inputs accept voltages up to 5.5 V • High-impedance when VCC =0V • bus-hold on all data inputs (74LVCH245A only) • Complies with JEDEC standard no. 8-1A • ESD protection: HBM EIA/JESD22-A114-A exceeds 2000 V MM EIA/JESD22-A115-A exceeds 200 V • Specified from −40 to +85 °C and −40 to +125 °C. DESCRIPTION The 74LVC245A/74LVCH245A is a high-performance, low-power, low-voltage, Si-gate CMOS device, superior to most advanced CMOS compatible TTL families. Inputs can be driven from either 3.3 or 5 V devices. In 3-state operation outputs can handle 5 V. These features allow the use of these devices as translators in a mixed 3.3 and 5 V environment. The 74LVC245A/74LVCH245A is an octal transceiver with non-inverting 3-state bus compatible outputs in both send and receive directions. The 74LVC245A/74LVCH245A has an output enable (OE) input for easy cascading and a send/receive (DIR) input for direction control. OE controls the outputs so that the buses are effectively isolated. QUICK REFERENCE DATA GND = 0 V; Tamb =25 °C; tr =tf ≤ 2.5 ns. Notes 1. CPD is used to determine the dynamic power dissipation (PD in µW). PD =CPD × VCC2 × fi × N+ Σ(CL × VCC2 × fo) where: fi = input frequency in MHz; fo = output frequency in MHz; CL = output load capacitance in pF; VCC = supply voltage in Volts; N = total load switching outputs; Σ(CL × VCC2 × fo) = sum of the outputs. 2. The condition is VI = GND to VCC. SYMBOL PARAMETER CONDITIONS TYPICAL UNIT tPHL/tPLH propagation delay An to Bn, Bn to An CL = 50 pF; VCC = 3.3 V 2.9 ns CI input capacitance 4.0 pF CI/O input/output capacitance 10.0 pF CPD power dissipation capacitance per buffer VCC = 3.3 V; notes 1 and 2 15 pF |
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