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| MC74F1245 OCTAL BIDIRECTIONAL TRANSCEIVER WITH 3-STATE INPUTS/OUTPUTS The MC74F1245 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 * High Impedance Inputs for Reduced Loading * Same Function and Pinout as the F245 * ESD Protection > 4000 Volts PIN ASSIGNMENT VCC OE 20 19 B0 18 B1 17 B2 16 B3 15 B4 14 B5 13 B6 12 B7 11 20 1 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 DW SUFFIX SOIC CASE 751D-03 1 T/R 2 A0 3 A1 4 A2 5 A3 6 A4 7 A5 8 A6 9 A7 10 GND LOGIC SYMBOL 2 3 4 5 6 7 8 9 ORDERING INFORMATION MC74FXXXXJ Ceramic MC74FXXXXN Plastic MC74FXXXXDW SOIC A0 A1 A2 A3 A4 A5 A6 A7 19 1 OE T/R B0 B1 B2 B3 B4 B5 B6 B7 18 17 16 15 14 13 12 11 GUARANTEED OPERATING RANGES Symbol VCC TA IOH IOL IOH IOL Parameter DC Supply Voltage Operating Ambient Temperature Range Output Current High Output Current Low Output Current High Output Current Low An Outputs An Outputs Bn Outputs Bn Outputs 74 74 74 74 74 74 Min 4.5 0 -- -- -- -- Typ 5.0 25 -- -- -- -- Max 5.5 70 -3.0 24 -15 64 Unit V C mA mA mA mA FAST AND LS TTL DATA 4-264 MC74F1245 FUNCTION TABLE Inputs OE L L H T/R L H X An A=B Inputs Z Inputs/Outputs Bn Inputs B=A Z H = HIGH voltage level: L = LOW voltage level: X = Don't care: Z = HIGH impedance "off" state. LOGIC DIAGRAM A0 2 A1 3 A2 4 A3 5 A4 6 A5 7 A6 8 A7 9 VCC = PIN 20 GND = PIN 10 19 OE T/R 1 18 B0 17 B1 16 B2 B3 15 B4 14 13 B5 12 B6 11 B7 FAST AND LS TTL DATA 4-265 MC74F1245 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 74 Output HIGH Voltage An Outputs 74 74 VOH Output HIGH Voltage Bn Outputs 74 74 VOL VOL IOZH IOZL Output LOW Voltage An Outputs Output LOW Voltage Bn Outputs Output Off Current HIGH Output Off Current LOW OE, T/R Inputs IIH Input HIGH Current An, Bn Inputs OE, T/R Inputs Bn Inputs IIHH IIL Input HIGH Current Input LOW Current An, Bn Inputs Output Short Circuit Current (Note 2) An Outputs Bn Outputs ICCH ICC Power Supply Current ICCL ICCZ -- -60 -100 -- -- -- -- -- -- -- -- -- -70 -150 -225 120 120 130 mA VCC = MAX An Inputs OE, T/R Inputs 74 74 Min 2.0 -- -- 2.4 2.7 2.4 2.7 2.0 -- -- -- -- -- -- -- -- -- -- Typ -- -- -0.73 3.3 3.3 3.4 3.4 -- 0.35 -- -- -- -- -- -- -- -- -- Max -- 0.8 -1.2 -- -- -- -- -- 0.5 0.55 70 -70 40 70 100 1.0 2.0 -40 Unit V V V V V V V V V V A A A A A mA mA A A mA mA VCC = MAX, VOUT = GND IOH = -3.0 mA IOH = -15 mA IOL = 24 mA IOL = 64 mA VCC = MAX IOH = -3.0 mA Test Conditions (Note 1) Guaranteed Input HIGH Voltage Guaranteed Input LOW Voltage VCC = MIN, IIN = -18 mA VCC = 4.5 V VCC = 4.75 V VCC = 4.5 V VCC = 4.75 V VCC = 4.5 V VCC = MIN VOUT = 2.7 V VCC = MAX, VOUT = 0.5 V VCC = MAX, VIN = 2.7 V VCC = MAX, VIN = 2.7 V VCC = 0 V, VIN = 7.0 V VCC = 0 V, VIN = 5.5 V VCC = 0 V, VIN = 5.5 V VCC = MAX, VIN = 0.5 V IOS 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. AC ELECTRICAL CHARACTERISTICS 74F TA = +25C VCC = +5.0 V CL = 50 pF Symbol tPLH tPHL tPZH tPZL tPHZ tPLZ Parameter Propagation Delay Transparent Mode An to Bn or Bn to An Output Enable Time Output Disable Time Min 2.0 2.5 3.0 4.0 2.0 1.0 Max 6.5 7.5 8.0 10.0 8.0 10.0 74F TA = 0C to +70C VCC = +5.0 V 10% CL = 50 pF Min 1.5 2.0 2.5 3.5 1.5 1.0 Max 7.0 8.0 9.0 11.0 9.0 11.0 Unit ns ns ns FAST AND LS TTL DATA 4-266 |
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