3 MC54/74F245 OCTAL BIDIRECTIONAL TRANSCEIVER WITH 3-STATE INPUTS/OUTPUTS OCTAL BIDIRECTIONAL TRANSCEIVER WITH 3-STATE INPUTS/OUTPUTS The MC54/74F245 contains eight noninverting bidirectional buffers with 3-state outputs and is intended for bus-oriented applications. Current sinking capability is 24 mA at the A ports and 64 mA at the B ports. The Transmit/Receive (T/R) input determines the direction of data flow through the bidirectional transceiver. Transmit (active HIGH) enables data from A ports to B ports; Receive (active LOW) enables data from B ports to A ports. The Output Enable input, when HIGH, disables both A and B ports by placing them in a high-Z condition. • Noninverting Buffers • Bidirectional Data Path • B Outputs Sink 64 mA • ESD > 4000 Volts FAST SCHOTTKY TTL 20 1 CONNECTION DIAGRAM (TOP VIEW) VCC 20 OE B0 18 19 B1 17 B2 16 B3 15 B4 14 B5 13 J SUFFIX CERAMIC CASE 732-03 B6 12 B7 11 N SUFFIX PLASTIC CASE 738-03 20 1 20 1 2 3 4 5 6 7 8 9 10 T/R A0 A1 A2 A3 A4 A5 A6 A7 GND 1 FUNCTION TABLE ORDERING INFORMATION Inputs OE T/R Output L L H L H X Bus B Data to Bus A Bus A Data to Bus B High-Z State DW SUFFIX SOIC CASE 751D-03 MC54FXXXJ MC74FXXXN MC74FXXXDW H = HIGH Voltage Level L = LOW Voltage Level X = Don’t Care Ceramic Plastic SOIC GUARANTEED OPERATING RANGES Symbol Parameter VCC Supply Voltage TA Operating Ambient Temperature Range IOH Output Current — High An Outputs IOL Output Current — Low An Outputs IOH Output Current — High Bn Outputs IOL Output Current — Low Bn Outputs Min Typ 54, 74 4.5 5.0 5.5 V 54 –55 25 125 °C 74 0 25 70 Unit 54, 74 –3.0 mA 74 24 mA 54 20 mA 54 –12 74 –15 54 48 74 64 FAST AND LS TTL DATA 4-115 Max mA mA MC54/74F245 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol Parameter Min VIH Input HIGH Voltage VIL Input LOW Voltage VIK Input Clamp Diode Voltage VOH Output HIGH Voltage, An Outputs VOH VOL VOL Output Off Current LOW IIH Input HIGH Current Test Conditions V Guaranteed Input HIGH Voltage 0.8 V Guaranteed Input LOW Voltage –1.2 V IIN = –18 mA VCC = MIN 2.4 3.3 V IOH = –3.0 mA VCC = 4.50 V 74 2.7 3.3 V IOH = –3.0 mA VCC = 4.75 V 54, 74 2.4 3.4 V IOH = –3.0 mA VCC = 4.50 V 74 2.7 3.4 V IOH = –3.0 mA VCC = 4.75 V 54 2.0 V IOH = –12 mA VCC = 4.50 V 74 2.0 V IOH = –15 mA Output LOW Voltage, Bn Outputs IOZL + IIL Unit 54, 74 Output LOW Voltage, An Outputs Output Off Current HIGH Max 2.0 Output HIGH Voltage, Bn Outputs IOZH + IIH Typ 54 0.35 0.5 V IOL = 20 mA VCC = MIN 74 0.35 0.5 V IOL = 24 mA 54 0.55 V IOL = 48 mA 74 0.55 V IOL = 64 mA 70 µA VOUT = 2.7 V VCC = MAX VCC = MAX VCC = MIN –650 mA VOUT = 0.5 V OE, T/R Inputs 20 µA VIN = 2.7 V OE, T/R Inputs 100 µA VIN = 7.0 V An, Bn Inputs 1.0 mA VIN = 5.5 V T/R Input –0.8 mA –1.2 mA VIN = 0.5 V VCC = MAX VCC = MAX IIL Input LOW Current OE Input IOS Output Short Circuit An Outputs –60 –150 mA VOUT = GND VCC = MAX Current (Note 2) Bn Outputs –100 –225 mA VOUT = GND VCC = MAX ICCH Power Supply Current HIGH 90 mA VCC = MAX, Outputs HIGH ICCL Power Supply Current LOW 120 mA VCC = MAX, Outputs LOW ICCZ Power Supply Current OFF 110 mA VCC = MAX, Outputs OFF 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. AC CHARACTERISTICS Symbol Parameter 54/74F 54F 74F TA = +25°C TA = -55°C to +125°C TA = 0°C to +70°C VCC = +5.0 V VCC = 5.0 V ± 10% VCC = 5.0 V ± 10% CL = 50 pF CL = 50 pF CL = 50 pF Min Max Min Max Min Max Unit tPLH tPHL Propagation Delay An to Bn or Bn to An 2.5 2.5 6.0 6.0 2.5 2.5 8.0 8.0 2.5 2.5 7.0 7.0 ns tPZH tPZL Output Enable Time 3.0 3.5 7.0 8.0 3.0 3.5 9.0 10 3.0 3.5 8.0 9.0 ns tPHZ tPLZ Output Disable Time 2.5 2.0 6.5 6.5 2.5 2.0 8.5 8.5 2.5 2.0 7.5 7.5 ns FAST AND LS TTL DATA 4-116