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| 3 MC54/74F245 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 CONNECTION DIAGRAM (TOP VIEW) VCC 20 OE 19 B0 18 B1 17 B2 16 B3 15 B4 14 B5 13 B6 12 B7 11 OCTAL BIDIRECTIONAL TRANSCEIVER WITH 3-STATE INPUTS/OUTPUTS FASTTM SCHOTTKY TTL 20 1 J SUFFIX CERAMIC CASE 732-03 N SUFFIX PLASTIC CASE 738-03 20 1 20 1 T/R 2 A0 3 A1 4 A2 5 A3 6 A4 7 A5 8 A6 9 A7 10 GND 1 DW SUFFIX SOIC CASE 751D-03 FUNCTION TABLE Inputs OE L L H T/R L H X Output Bus B Data to Bus A Bus A Data to Bus B High-Z State H = HIGH Voltage Level L = LOW Voltage Level X = Don't Care ORDERING INFORMATION MC54FXXXJ MC74FXXXN MC74FXXXDW Ceramic Plastic SOIC GUARANTEED OPERATING RANGES Symbol VCC TA Supply Voltage Operating Ambient Temperature Range Parameter 54, 74 54 74 IOH IOL IOH IOL Output Current -- High Output Current -- Low An Outputs An Outputs Bn Outputs Bn Outputs 54, 74 74 54 54 74 54 74 Min 4.5 -55 0 Typ 5.0 25 25 Max 5.5 125 70 -3.0 24 20 -12 -15 48 64 mA mA mA mA Unit V C Output Current -- High Output Current -- Low mA FAST AND LS TTL DATA 4-115 MC54/74F245 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol VIH VIL VIK VOH Parameter Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Voltage, An Outputs 54, 74 74 54, 74 VOH Output HIGH Voltage, Bn Outputs 74 54 74 VOL Output LOW Voltage, An Outputs 54 74 VOL Output LOW Voltage, Bn Outputs 54 74 IOZH + IIH IOZL + IIL Output Off Current HIGH Output Off Current LOW OE, T/R Inputs IIH Input HIGH Current OE, T/R Inputs An, Bn Inputs T/R Input IIL IOS Input LOW Current Output Short Circuit Current (Note 2) ICCH ICCL ICCZ Power Supply Current HIGH Power Supply Current LOW Power Supply Current OFF OE Input An Outputs Bn Outputs -60 -100 2.4 2.7 2.4 2.7 2.0 2.0 0.35 0.35 0.5 0.5 0.55 0.55 70 -650 20 100 1.0 -0.8 -1.2 -150 -225 90 120 110 3.3 3.3 3.4 3.4 Min 2.0 0.8 -1.2 Typ Max Unit V V V V V V V V V V V V V A mA A A mA mA mA mA mA mA mA mA VIN = 0.5 V VOUT = GND VOUT = GND VCC = MAX VCC = MAX VCC = MAX Test Conditions Guaranteed Input HIGH Voltage Guaranteed Input LOW Voltage IIN = -18 mA IOH = -3.0 mA IOH = -3.0 mA IOH = -3.0 mA IOH = -3.0 mA IOH = -12 mA IOH = -15 mA IOL = 20 mA IOL = 24 mA IOL = 48 mA IOL = 64 mA VOUT = 2.7 V VOUT = 0.5 V VIN = 2.7 V VIN = 7.0 V VIN = 5.5 V VCC = MAX VCC = MAX VCC = MAX VCC = MIN VCC = MIN VCC = MIN VCC = 4.50 V VCC = 4.75 V VCC = 4.50 V VCC = 4.75 V VCC = 4.50 V VCC = MAX, Outputs HIGH VCC = MAX, Outputs LOW 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 54/74F TA = +25C VCC = +5.0 V CL = 50 pF Symbol tPLH tPHL tPZH tPZL tPHZ tPLZ Parameter Propagation Delay An to Bn or Bn to An Output Enable Time Output Disable Time Min 2.5 2.5 3.0 3.5 2.5 2.0 Max 6.0 6.0 7.0 8.0 6.5 6.5 54F TA = -55C to +125C VCC = 5.0 V 10% CL = 50 pF Min 2.5 2.5 3.0 3.5 2.5 2.0 Max 8.0 8.0 9.0 10 8.5 8.5 74F TA = 0C to +70C VCC = 5.0 V 10% CL = 50 pF Min 2.5 2.5 3.0 3.5 2.5 2.0 Max 7.0 7.0 8.0 9.0 7.5 7.5 Unit ns ns ns FAST AND LS TTL DATA 4-116 |
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