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74ABT244CMSA Scheda tecnica(PDF) 5 Page - Fairchild Semiconductor |
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74ABT244CMSA Scheda tecnica(HTML) 5 Page - Fairchild Semiconductor |
5 / 11 page 5 www.fairchildsemi.com Skew Note 13: Skew is defined as the absolute value of the difference between the actual propagation delays for any two separate outputs of the same device. The specification applies to any outputs switching HIGH-to-LOW (tOSHL), LOW-to-HIGH (tOSLH), or any combination switching LOW-to-HIGH and/or HIGH-to-LOW (tOST). The specification is guaranteed but not tested. Note 14: Propagation delay variation for a given set of conditions (i.e., temperature and VCC) from device to device. This specification is guaranteed but not tested. Note 15: This specification is guaranteed but not tested. The limits apply to propagation delays for all paths described switching in phase (i.e., all LOW-to-HIGH, HIGH-to-LOW, etc.) Note 16: These specifications guaranteed but not tested. The limits represent propagation delays with 250 pF load capacitors in place of the 50 pF load capacitors in the standard AC load. Note 17: This describes the difference between the delay of the LOW-to-HIGH and the HIGH-to-LOW transition on the same pin. It is measured across all the outputs (drivers) on the same chip, the worst (largest delta) number is the guaranteed specification. This specification is guaranteed but not tested. Capacitance Note 18: COUT is measured at frequency f 1 MHz, per MIL-STD-883, Method 3012. TA 40qC to 85qCTA 40qC to 85qC VCC 4.5V–5.5V VCC 4.5V–5.5V Symbol Parameter CL 50 pF CL 250 pF Units 8 Outputs Switching 8 Outputs Switching (Note 15) (Note 16) Max Max tOSHL Pin to Pin Skew 0.8 1.8 ns (Note 13) HL Transitions tOSLH Pin to Pin Skew 0.8 1.8 ns (Note 13) LH Transitions tPS Duty Cycle 1.0 2.5 ns (Note 17) LH–HL Skew tOST Pin to Pin Skew 1.0 2.5 ns (Note 13) LH/HL Transitions tPV Device to Device Skew 1.5 3.0 ns (Note 14) LH/HL Transitions Symbol Parameter Typ Units Conditions TA 25qC CIN Input Capacitance 5.0 pF VCC 0V COUT (Note 18) Output Capacitance 9.0 pF VCC 5.0V |
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