74HCT1284

INTEGRATED CIRCUITS 74HCT1284 Parallel printer interface transceiver/buffer Product specification Supersedes data of 1995 Jun 27 IC06 Data Handbook 1998 Jul 10 Philips Semiconductors Philips Semiconductors Product specification Parallel printer interface transceiver/buffer 74HCT1284 FEATURES Asynchronous operation 4-Bit transceivers 3 additional buffer/driver lines TTL compatible inputs ESD protection exceeds 2000V per MIL STD 883 Method 3015 and 200V per Machine Model DESCRIPTION The 74HCT1284 parallel interface chip is designed to provide an asynchronous, 4-bit, bi-directional, parallel printer interface for personal computers. Three additional lines are included to provide handshaking signals between the host and the peripheral. The part is designed to match IEEE 1284 standard. The 4 transceiver pins (A/B 1-4) allow data transmission from the A bus to the B bus, or from the B bus to the A bus, depending on the state of the direction pin DIR. The B bus and the Y5-Y7 lines have totem pole or open drain style outputs depending on the state of the high drive enable pin HD. The A bus only has totem pole style outputs. All inputs are TTL compatible with at least 400mV of input hysteresis at VCC = 5.0V. Input Hysteresis Low Noise Operation Center Pin VCC & GND IEEE 1284 Compliant Level 1 & 2 Overvoltage Protection on B side QUICK REFERENCE DATA SYMBOL tPLH tPHL CIN COUT ICC PARAMETER Propagation delay Bn to An Input capacitance An, DIR, HD Output cap...