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74F657 Datasheet(PDF) 7 Page - NXP Semiconductors |
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74F657 Datasheet(HTML) 7 Page - NXP Semiconductors |
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7 / 12 page  Philips Semiconductors Product specification 74F657 Octal transceiver with 8-bit parity generator/checker 90 July 30 7 AC ELECTRICAL CHARACTERISTICS LIMITS Tamb = +25°C Tamb = 0°C to +70°C Tamb = –40°C to +85°C SYMBOL PARAMETER TEST VCC = +5.0V VCC = +5.0V ± 10% VCC = +5.0V ± 10% UNIT CONDITION CL = 50pF, RL = 500Ω CL = 50pF, RL = 500Ω CL = 50pF, RL = 500Ω MIN TYP MAX MIN MAX MIN MAX tPLH tPHL Propagation delay An to Bn or Bn to An Waveform 2 2.5 3.0 5.5 6.0 7.5 7.5 2.5 3.0 8.0 8.0 2.0 2.5 9.0 9.0 ns tPLH tPHL Propagation delay An to PARITY Waveform 1, 2 7.0 7.0 10.0 10.0 14.0 15.0 7.0 7.0 16.0 16.0 5.5 6.5 16.5 19.0 ns tPLH tPHL Propagation delay ODD/EVEN to PARITY, ERROR Waveform 1, 2 4.5 4.5 7.5 8.0 11.0 11.5 4.5 4.5 12.0 12.5 3.5 4.0 13.0 15.5 ns tPLH tPHL Propagation delay Bn to ERROR Waveform 1, 2 8.0 8.0 14.0 14.0 20.5 20.5 7.5 7.5 22.5 22.5 7.5 7.5 24.5 25.0 ns tPLH tPHL Propagation delay PARITY to ERROR Waveform 1, 2 8.0 8.0 11.5 12.0 15.5 15.5 7.5 8.0 16.5 17.0 6.5 6.5 18.5 20.0 ns tPZH tPZL Output enable time1 to high or low level Waveform 3, 4 3.0 4.0 5.5 7.0 8.0 9.5 3.0 4.0 9.0 11.0 2.0 4.0 9.0 13.0 ns tPHZ tPLZ Output disable time from high or low level Waveform 3, 4 2.0 2.0 4.5 4.0 7.5 6.0 2.0 2.0 8.0 6.5 1.0 1.0 8.0 7.5 ns Note to AC electrical characteristics 1. These delay times reflect the 3-state recovery time only and not the signal through the buffers or the parity check circuitry. 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. VALID data at the ERROR pin > (B to A) + (A to PARITY). AC WAVEFORMS VM VM VM VM tPLH tPHL An, Bn, ODD/EVEN, PARITY PARITY, ERROR SF00418 Waveform 1. Propagation delay for inverting outputs VM VM VM VM tPHL tPLH An, Bn, PARITY, ERROR An, Bn, ODD/EVEN, PARITY SF00420 Waveform 2. Propagation delay for non-Inverting outputs VM VM VM tPHZ tPZH OE VOH -0.3V 0V An, Bn, PARITY, ERROR SF00419 Waveform 3. 3-state output enable time to high level and output disable time from high level VM VM VM tPLZ tPZL OE VOL +0.3V 3.5V An, Bn, PARITY, ERROR SF00421 Waveform 4. 3-state output enable time to low level and output disable time from low level Note to AC waveforms 1. For all waveforms, VM = 1.5V. |
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