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74F657 数据表(PDF) 5 Page - Fairchild Semiconductor |
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74F657 数据表(HTML) 5 Page - Fairchild Semiconductor |
5 / 7 page 5 www.fairchildsemi.com AC Electrical Characteristics Note 3: These delay times reflect the 3-STATE recovery time only and not the signal time through the buffers or the parity check circuity. To assure VALID information at the ERROR pin, time must be allowed for the signal to propagate through the drivers (B to A), through the parity check circuitry (same as A to PARITY), and to the ERROR output after the ERROR pin has been enabled (Output Enable times). VALID data at the ERROR pin ≥ (A to PARITY) + (Output Enable Time). Symbol Parameter TA = +25°CTA = −55°C to +125°CTA = 0°C to +70°C Units VCC = +5.0V VCC = +5.0V VCC = +5.0V CL = 50 pF CL = 50 pF CL = 50 pF Min Typ Max Min Max Min Max tPLH Propagation Delay 2.5 4.5 8.0 2.5 9.5 2.5 9.0 ns tPHL An to Bn, Bn to An 3.0 4.9 7.5 3.0 8.5 3.0 8.0 tPLH Propagation Delay 6.5 10.1 14.0 5.5 18.0 6.0 16.0 ns tPHL An to Parity 7.0 10.9 15.0 5.5 20.5 6.0 16.5 tPLH Propagation Delay 4.5 7.8 11.0 4.0 14.0 4.0 13.0 ns tPHL ODD/EVEN to PARITY 4.5 8.8 12.0 4.5 16.5 4.5 13.5 tPLH Propagation Delay 4.5 7.5 11.0 4.0 14.0 4.0 13.0 ns tPHL ODD/EVEN to ERROR 4.5 8.2 12.0 4.5 16.5 4.5 13.5 tPLH Propagation Delay 8.0 14.0 20.5 7.5 27.0 7.5 23.0 ns tPHL Bn to ERROR 8.0 15.0 21.5 7.5 28.5 7.5 23.5 tPLH Propagation Delay 7.0 10.8 15.5 6.0 20.0 6.0 17.0 ns tPHL PARITY to ERROR 7.5 11.8 16.5 6.5 22.0 7.5 18.5 tPZH Output Enable Time 3.0 5.0 8.0 2.5 11.0 2.5 9.5 ns tPZL OE to An/Bn 4.0 6.5 10.0 3.5 13.5 3.5 11.0 tPHZ Output Disable Time 1.0 4.5 8.0 1.0 9.5 1.0 9.0 ns tPLZ OE to An/Bn 1.0 4.9 7.5 1.0 8.5 1.0 8.0 tPZH Output Enable Time 3.0 5.0 8.0 2.5 11.0 2.5 9.5 ns tPZL OE to ERROR (Note 3) 4.0 7.7 10.0 3.5 13.5 3.5 11.0 tPHZ Output Disable Time 1.0 4.5 8.0 1.0 9.5 1.0 9.0 ns tPLZ OE to ERROR 1.0 4.9 7.5 1.0 8.5 1.0 8.0 tPZH Output Enable Time 3.0 5.0 8.0 2.5 11.0 2.5 9.5 ns tPZL OE to PARITY 4.0 7.7 10.0 3.5 13.5 3.5 11.0 tPHZ Output Disable Time 1.0 4.6 8.0 1.0 9.5 1.0 9.0 ns tPLZ OE to PARITY 1.0 5.1 7.5 1.0 8.5 1.0 8.0 |
类似零件编号 - 74F657 |
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类似说明 - 74F657 |
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