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74ABT657 Fiches technique(PDF) 7 Page - NXP Semiconductors |
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74ABT657 Fiches technique(HTML) 7 Page - NXP Semiconductors |
7 / 11 page Philips Semiconductors Product specification 74ABT657 Octal transceiver with parity generator/checker (3-State) 1995 Dec 11 7 AC CHARACTERISTICS GND = 0V; tR = tF = 2.5ns; CL = 50pF, RL = 500Ω LIMITS SYMBOL PARAMETER WAVEFORMS Tamb = +25oC VCC = +5.0V Tamb = –40 to +85oC VCC = +5.0V ±10% UNIT Min Typ Max Min Max tPLH tPHL Propagation delay An to Bn or Bn to An 2 1.1 1.2 3.3 3.0 5.0 4.3 1.1 1.2 5.5 4.8 ns tPLH tPHL Propagation delay An to PARITY 1, 2 2.5 2.8 6.5 7.0 8.7 9.1 2.5 2.8 10.1 10.6 ns tPLH tPHL Propagation delay ODD/EVEN to PARITY, ERROR 1, 2 1.7 1.9 5.0 5.0 6.6 6.6 1.7 1.9 7.3 7.3 ns tPLH tPHL Propagation delay Bn to ERROR 1, 2 3.9 4.0 9.2 9.6 11.7 12.1 3.9 4.0 13.8 14.5 ns tPLH tPHL Propagation delay PARITY to ERROR 1, 2 2.7 3.2 6.0 6.4 7.6 8.0 2.7 3.2 9.4 9.4 ns tPZH tPZL Output enable time1 to High or Low level 3, 4 1.3 1.9 3.8 4.4 5.6 7.0 1.3 1.9 6.6 8.2 ns tPHZ tPLZ Output disable time from High or Low level 3, 4 2.4 2.7 5.1 5.4 7.0 7.6 2.4 2.7 7.6 8.1 ns NOTES: 1. These delay times reflect the 3-State recovery time only and do not include the delay through the buffers and the parity check circuitry which affect the ERROR output. 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 NOTE: For all waveforms, VM = 1.5V. An, Bn ODD/EVEN PARITY VM tPHL tPLH VM VM VM PARITY, ERROR An, Bn ODD/EVEN PARITY VM tPHL tPLH VM VM VM PARITY, ERROR SA00219 Waveform 1. Propagation Delay For Inverting Output OE VM tPZH tPHZ 0V VOH –0.3V VM VM An, Bn PARITY, ERROR SA00221 Waveform 3. 3-State Output Enable Time to High Level and Output Disable Time from High Level SA00220 VM tPLH tPHL VM VM VM An, Bn ODD/EVEN PARITY An, Bn, PARITY, ERROR Waveform 2. Propagation Delay For Non-Inverting Output SA00222 tPZL tPLZ 0V VOL +0.3V VM VM VM OE An, Bn PARITY, ERROR Waveform 4. 3-State Output Enable Time to Low Level and Output Disable Time from Low Level |
Numéro de pièce similaire - 74ABT657 |
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Description similaire - 74ABT657 |
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