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74HCT1284DB 데이터시트(PDF) 2 Page - NXP Semiconductors |
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2 / 12 page Philips Semiconductors Product specification 74HCT1284 Parallel printer interface transceiver/buffer 2 1998 Jul 10 853–1768 19693 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 • Input Hysteresis • Low Noise Operation • Center Pin V CC & GND • IEEE 1284 Compliant Level 1 & 2 • Overvoltage Protection on B side 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. QUICK REFERENCE DATA SYMBOL PARAMETER CONDITIONS Tamb = 25°C; GND = 0V TYPICAL UNIT tPLH tPHL Propagation delay Bn to An CL = 50pF; VCC = 5V 5.3 5.6 ns ns CIN Input capacitance An, DIR, HD VI = 0V or VCC 5 pF COUT Output capacitance Bn, Yn VO = 0V or VCC; 3-State 14 pF ICC Total supply current VCC = 5.5V 500 nA ORDERING INFORMATION PACKAGES TEMPERATURE RANGE ORDER CODE DRAWING NUMBER 20-pin plastic DIP 0 °C to +70°C 74HCT1284N SOT146-1 20-pin plastic SOL 0 °C to +70°C 7HCT1284D SOT163-1 20-pin plastic SSOP Type II 0 °C to +70°C 74HCT1284DB SOT339-1 20-pin plastic TSSOP Type I 0 °C to +70°C 74HCT1284PW SOT360-1 PIN CONFIGURATION 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 A1 A2 A3 A4 GND GND A5 A6 A7 DIR B1 B2 B3 B4 VCC VCC Y5 Y7 Y6 HD SK00001 PIN DESCRIPTION PIN NUMBER SYMBOL FUNCTION 1,2,3,4 20,19,18,17 A1 - A4 B1 - B4 Data inputs/outputs 7,8,9 14,13,12 A5 - A7 Y5 - Y7 Buffer/Driver lines 10,11 DIR,HIGH DRIVE Direction, Drive 5,6 GND Ground (0V) 15,16 VCC Positive supply voltage |
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