MC74F620 MC74F623 OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS (INVERTING AND NONINVERTING) The MC74F620 is an octal bus transceiver featuring inverting 3-state buscompatible outputs in both send and receive directions. The BN outputs are capable of sinking 64 mA and sourcing up to 15 mA, providing very good capacitive drive characteristics. The MC74F623 is a non-inverting version of the MC74F620. These octal bus transceivers are designed for asynchronous two-way communication between data busses. The control function implementation allows for maximum flexibility in timing. These devices allow data transmission from the A bus to the B bus or from B bus to A bus, depending upon the logic levels at the Enable inputs (OEBA and OEAB). The Enable inputs can be used to disable the device so that the busses are effectively isolated. The dual-enable configuration gives the MC74F620 and MC74F623 the capability to store data by the simultaneous enabling of OEBA and OEAB. Each output reinforces its input in this transceiver configuration. Thus, when both control inputs are enabled and all other data sources to the two sets of the bus lines are at high impedance, both sets of bus lines (16 in all) will remain at their last states. • High Impedance NPN base inputs for reduced loading (70 µA in High and Low states) • Ideal for Applications which Require High Output drive and minimal bus loading • Octal Bidirectional Bus Interface • 3-State Buffer Outputs Sink 64 mA and Source 15 mA • – F620 Inverting – F623 Noninverting • ESD Protection > 4000 Volts OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS (INVERTING AND NONINVERTING) FAST SCHOTTKY TTL J SUFFIX CERAMIC CASE 732-03 20 1 N SUFFIX PLASTIC CASE 738-03 20 1 DW SUFFIX SOIC CASE 751D-03 20 1 ORDERING INFORMATION MC74FXXXJ Ceramic MC74FXXXN Plastic MC74FXXXDW SOIC PIN ASSIGNMENTS VCC OEBA B0 20 19 18 B1 17 B2 16 B3 15 B4 14 B5 13 B6 12 B7 11 VCC OEBA B0 20 19 18 B1 17 B2 16 F620 1 2 OEAB A0 3 A1 4 A2 5 A3 6 A4 B3 15 B4 14 B5 13 B6 12 B7 11 7 A5 8 A6 9 A7 10 GND F623 7 A5 8 A6 9 A7 10 GND 1 2 OEAB A0 FAST AND LS TTL DATA 4-233 3 A1 4 A2 5 A3 6 A4 MC74F620 • MC74F623 LOGIC SYMBOLS 1 19 2 3 4 5 6 7 8 9 A0 A1 A2 A3 A4 A5 A6 A7 1 OEAB 19 OEBA OEAB F620 OEBA 2 3 4 5 6 7 8 9 A0 A1 A2 A3 A4 A5 A6 A7 F623 B0 B1 B2 B3 B4 B5 B6 B7 B0 B1 B2 B3 B4 B5 B6 B7 18 17 16 15 14 13 12 11 18 17 16 15 14 13 12 11 FUNCTION TABLE Operating Modes Inputs OEBA OEAB F620 F623 L L B data to A bus B data to A bus H H A data to B bus A data to B bus H L Z Z L H B data to A bus A data to B bus B data to A bus A data to B bus H = HIGH voltage level: L = LOW voltage level: X = Don’t care: Z = High impedance “off” state GUARANTEED OPERATING RANGES Limits Symbol VCC Parameter DC Supply Voltage 74 Min Typ Max Unit 4.5 5.0 5.5 V TA Operating Ambient Temperature Range 74 0 25 70 °C IOH Output Current High An Outputs 74 — — –3.0 mA IOH Output Current High Bn Outputs 74 — — –15 mA IOL Output Current Low An Outputs 74 — — 24 mA IOL Output Current Low Bn Outputs 74 — — 64 mA FAST AND LS TTL DATA 4-234 MC74F620 • MC74F623 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol Parameter Test Conditions (Note 1) Min Typ Max Unit — V Guaranteed as a HIGH Signal VIH Input HIGH Voltage 2.0 — VIL Input LOW Voltage — — 0.8 V Guaranteed as a LOW Signal VIK Input Clamp Diode Voltage — — –1.2 V VCC = MIN, IIN = –18 mA 74 2.4 3.3 — V IOH = –3.0 mA VCC = 4.5 V 74 2.7 3.3 — V IOH = –3.0 mA VCC = 4.75 V 74 2.4 3.4 — V IOH = –3.0 mA VCC = 4.5 V 74 2.7 3.4 — V IOH = –3.0 mA VCC = 4.75 V An VOH Output HIGH Voltage Bn 74 2.0 — — V IOH = –15.0 mA VCC = 4.5 V VOL Output LOW Voltage An 74 — 0.35 0.50 V IOL = 24 mA VCC = MIN VOL Output LOW Voltage Bn 74 — — 0.55 V IOL = 64 mA VCC = MIN IOZH + IIH Output Off Current HIGH — — 70 µA VCC = MAX VOUT = 2.7 V IOZL + IIL Output Off Current LOW — — –70 µA VCC = MAX VOUT = 0.5 V OEBA, OEAB — — 20 µA VCC = MAX, VIN = 2.7 V IIH Input HIGH Current OEBA, OEAB — — 100 µA VCC = 0 V, VIN = 7.0 V Others — — 1.0 mA VCC = MAX, VIN = 5.5 V Non I/O Pins — — –20 µA VCC = MAX, VIN = 0.5 V A0–A7 –60 — –150 mA B0–B7 –100 — –225 VCC = MAX, VOUT = GND ICCH — — 92 ICCL — — 110 ICCZ — — 92 — — 120 IIL Input LOW Current IOS Output Short Circuit Current (Note 2) ICC Power Supply Current ICC Power Supply Current F620 F623 Vout = HIGH mA Vout = LOW VCC = MAX Vout = HIGH Z mA VCC = MAX NOTES: 1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable device type. 2. Not more than one output should be shorted at a time, nor for more than 1 second. FAST AND LS TTL DATA 4-235 MC74F620 • MC74F623 LOGIC DIAGRAMS F623 F620 19 19 OEBA OEAB OEBA 1 OEAB 2 4 A3 16 5 15 6 14 A4 7 A7 A0 B1 A1 B2 A2 B3 A3 B4 A4 B5 A5 8 12 B6 A6 9 11 B7 A7 17 B1 4 5 16 B2 15 B3 6 14 B4 7 13 B5 8 12 B6 9 FAST AND LS TTL DATA 4-236 18 B0 3 13 A5 A6 B0 17 A1 A2 2 18 A0 3 1 11 B7 MC74F620 • MC74F623 AC ELECTRICAL CHARACTERISTICS For F620 Symbol Parameter 74F 74F TA = +25°C VCC = +5.0 V CL = 50 pF TA = 0°C to +70°C VCC = +5.0 V ±10% CL = 50 pF Min Typ Max Min Typ Max Unit tPLH tPHL Propagation Delay An to Bn and Bn to An 2.5 1.0 — — 6.5 4.5 2.0 1.0 — — 7.5 5.0 ns tPZH tPZL Output Enable Time to High or Low level, OEBA to An 3.0 4.0 — — 10.5 10.5 2.5 3.5 — — 11.5 11.5 ns tPHZ tPLZ Output Disable Time to High or Low level, OEBA to An 2.5 1.5 — — 7.5 7.0 2.0 1.0 — — 8.0 7.5 ns tPZH tPZL Output Enable Time to High or Low level, OEAB to Bn 3.5 4.5 — — 10.5 10.0 3.5 4.0 — — 11.5 11.0 ns tPHZ tPLZ Output Disable Time to High or Low level, OEAB to Bn 3.0 3.0 — — 9.5 9.5 2.5 1.5 — — 10.5 10.5 ns AC ELECTRICAL CHARACTERISTICS For F623 Symbol Parameter 74F 74F TA = +25°C VCC = +5.0 V CL = 50 pF TA = 0°C to +70°C VCC = +5.0 V ±10% CL = 50 pF Min Typ Max Min Typ Max Unit tPLH tPHL Propagation Delay An to Bn 2.0 3.0 — — 5.5 7.0 2.0 2.5 — — 6.5 7.5 ns tPLH tPHL Propagation Delay Bn to An 2.0 3.0 — — 6.0 7.0 2.0 2.5 — — 6.5 7.5 ns tPZH tPZL Output Enable Time to High or Low level, OEBA to An 3.5 5.0 — — 10.5 9.5 3.5 5.0 — — 12.0 10.0 ns tPHZ tPLZ Output Disable Time to High or Low level, OEBA to An 1.5 1.5 — — 6.5 6.5 1.5 1.5 — — 7.5 7.0 ns tPZH tPZL Output Enable Time to High or Low level, OEAB to Bn 3.5 4.5 — — 10.0 9.0 3.5 4.5 — — 11.5 9.5 ns tPHZ tPLZ Output Disable Time to High or Low level, OEAB to Bn 3.0 4.0 — — 8.5 9.0 3.0 2.0 — — 10.0 10.0 ns FAST AND LS TTL DATA 4-237