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74ABT899CMSA Arkusz danych(PDF) 9 Page - Fairchild Semiconductor |
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74ABT899CMSA Arkusz danych(HTML) 9 Page - Fairchild Semiconductor |
9 / 16 page 9 www.fairchildsemi.com Skew (PLCC package) (Note 2) Note 19: 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 20: This specification is 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 21: 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). This specification is guaranteed but not tested. Skew applies to propagation delays individually; i.e., An to Bn separate from LEA to An. Note 22: 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. Note 23: 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. Capacitance Note 24: CI/O is measured at frequency, f = 1 MHz, per MIL-STD-883B, Method 3012. Symbol Parameter TA = −40°C to +85°CTA = −40°C to +85°C Units VCC = 4.5V–5.5V VCC = 4.5V–5.5V CL = 50 pF CL = 250 pF 9 Outputs Switching 9 Outputs Switching (Note 19) (Note 20) Max Max tOSHL Pin to Pin Skew 1.0 2.0 ns (Note 21) HL Transitions tOSLH Pin to Pin Skew 1.1 2.1 ns (Note 21) LH Transitions tPS Duty Cycle 2.0 3.5 ns (Note 22) LH–HL Skew tOST Pin to Pin Skew 2.0 3.5 ns (Note 21) LH/HL Transitions tPV Device to Device Skew 3.0 4.0 ns (Note 23) LH/HL Transitions Symbol Parameter Typ Units Conditions TA = 25°C CIN Input Pin Capacitance 5.0 pF VCC = 0V CI/O (Note 24) Output Capacitance 11.0 pF VCC = 5.0V |
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