MC74F1245 OCTAL BIDIRECTIONAL TRANSCEIVER WITH 3-STATE INPUTS/OUTPUTS 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 FAST SCHOTTKY TTL J SUFFIX CERAMIC CASE 732-03 20 1 N SUFFIX PLASTIC CASE 738-03 PIN ASSIGNMENT VCC OE 20 19 B0 18 B1 17 B2 16 B3 15 B4 14 B5 13 B6 12 B7 11 20 1 DW SUFFIX SOIC CASE 751D-03 20 1 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 ORDERING INFORMATION 9 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 Parameter Min Typ Max Unit VCC DC Supply Voltage 74 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 IOL Output Current Low An Outputs 74 — — 24 mA IOH Output Current High Bn Outputs 74 — — –15 mA IOL Output Current Low Bn Outputs 74 — — 64 mA FAST AND LS TTL DATA 4-264 MC74F1245 FUNCTION TABLE Inputs/Outputs Inputs OE T/R An Bn L L A=B Inputs L H Inputs B=A H X Z 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 15 B3 FAST AND LS TTL DATA 4-265 14 B4 13 B5 12 B6 11 B7 MC74F1245 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol Parameter Test Conditions (Note 1) Min Typ Max Unit — — V Guaranteed Input HIGH Voltage VIH Input HIGH Voltage 2.0 VIL Input LOW Voltage — — 0.8 V Guaranteed Input LOW Voltage VIK Input Clamp Diode Voltage — –0.73 –1.2 V VCC = MIN, IIN = –18 mA 2.4 3.3 — V VOH Output HIGH Voltage An Outputs 74 VOH Output HIGH Voltage Bn Outputs 74 2.7 3.3 — V 74 2.4 3.4 — V IOH = –3.0 mA IOH = –3.0 mA 74 2.7 3.4 — V 74 2.0 — — V IOH = –15 mA VCC = 4.5 V VCC = 4.75 V VCC = 4.5 V VCC = 4.75 V VCC = 4.5 V VOL Output LOW Voltage An Outputs 74 — 0.35 0.5 V IOL = 24 mA VOL Output LOW Voltage Bn Outputs 74 — — 0.55 V IOL = 64 mA IOZH Output Off Current HIGH — — 70 µA VCC = MAX IOZL Output Off Current LOW — — –70 µA VCC = MAX, VOUT = 0.5 V OE, T/R Inputs — — 40 µA VCC = MAX, VIN = 2.7 V An, Bn Inputs — — 70 µA VCC = MAX, VIN = 2.7 V OE, T/R Inputs — — 100 µA VCC = 0 V, VIN = 7.0 V Bn Inputs — — 1.0 mA VCC = 0 V, VIN = 5.5 V An Inputs — — 2.0 mA VCC = 0 V, VIN = 5.5 V OE, T/R Inputs — — –40 µA An, Bn Inputs — — –70 µA An Outputs –60 — –150 mA Bn Outputs –100 — –225 mA ICCH — — 120 ICCL — — 120 ICCZ — — 130 IIH Input HIGH Current IIHH Input HIGH Current IIL Input LOW Current IOS ICC Output Short Circuit Current (Note 2) Power Supply Current mA VCC = MIN VOUT = 2.7 V VCC = MAX, VIN = 0.5 V VCC = MAX, VOUT = GND 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. AC ELECTRICAL CHARACTERISTICS 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 Max Min Max Unit tPLH tPHL Propagation Delay Transparent Mode An to Bn or Bn to An 2.0 2.5 6.5 7.5 1.5 2.0 7.0 8.0 ns tPZH tPZL Output Enable Time 3.0 4.0 8.0 10.0 2.5 3.5 9.0 11.0 ns tPHZ tPLZ Output Disable Time 2.0 1.0 8.0 10.0 1.5 1.0 9.0 11.0 ns FAST AND LS TTL DATA 4-266