HD74AC245/HD74ACT245 Octal Bidirectional Transceiver with 3-State Input/Output Description The HD74AC245/HD74ACT245 contains eight non-inverting bidirectional buffers with 3-state outputs and is intended for bus-oriented applications. Current sinking capability is 24 mA at both the A and 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. Features • • • • Noninverting Buffers Bidirectional Data Path A and B Outputs Source/Sink 24 mA HD74ACT245 has TTL-Compatible Inputs Pin Names OE T/R A0 to A7 B 0 to B7 Output Enable Input Transmit/Receive Input Side A 3-State Inputs or 3-State Outputs Side B 3-State Inputs or 3-State Outputs HD74AC245/HD74ACT245 Pin Arrangement T/R 1 20 VCC A0 2 19 OE A1 3 18 B0 A2 4 17 B1 A3 5 16 B2 A4 6 15 B3 A5 7 14 B4 A6 8 13 B5 A7 9 12 B6 GND 10 11 B7 (Top view) Truth Tables Inputs OE T/R Outputs L L Bus B Data to Bus A L H Bus A Data to Bus B H X High Z State H : L : X : 2 High Voltage Level Low Voltage Level Immaterial HD74AC245/HD74ACT245 DC Characteristics (unless otherwise specified) Item Symbol Max Unit Condition Maximum quiescent supply current I CC 80 µA VIN = VCC or ground, VCC = 5.5 V, Ta = Worst case Maximum quiescent supply current I CC 8.0 µA VIN = VCC or ground, VCC = 5.5 V, Ta = 25°C Maximum additional ICC/input (HD74ACT245) I CCT 1.5 mA VIN = VCC – 2.1 V, VCC = 5.5 V, Ta = Worst case AC Characteristics: HD74AC245 Ta = +25°C CL = 50 pF Ta = –40°C to +85°C CL = 50 pF Item Symbol VCC (V)*1 Min Typ Max Min Max Unit Propagation delay t PLH 3.3 1.0 5.0 8.5 1.0 9.0 ns 5.0 1.0 3.5 6.5 1.0 7.0 3.3 1.0 5.0 8.5 1.0 9.0 5.0 1.0 3.5 6.0 1.0 7.0 3.3 1.0 7.0 11.5 1.0 12.5 5.0 1.0 5.0 8.5 1.0 9.0 3.3 1.0 7.5 12.0 1.0 13.5 5.0 1.0 5.5 9.0 1.0 9.5 3.3 1.0 6.5 12.0 1.0 12.5 5.0 1.0 5.5 9.0 1.0 10.0 3.3 1.0 7.0 11.5 1.0 13.0 5.0 1.0 5.5 9.0 1.0 10.0 Data to output Propagation delay t PHL Data to output Output enable time Output enable time Output disable time Output disable time Note: t PZH t PZL t PHZ t PLZ ns ns ns ns ns 1. Voltage Range 3.3 is 3.3 V ± 0.3 V Voltage Range 5.0 is 5.0 V ± 0.5 V 3 HD74AC245/HD74ACT245 AC Characteristics: HD74ACT245 Ta = +25°C CL = 50 pF Ta = –40°C to +85°C CL = 50 pF Item Symbol VCC (V)*1 Min Typ Max Min Max Unit Propagation delay Data to output t PLH 5.0 1.0 4.0 7.5 1.0 8.0 ns Propagation delay Data to output t PHL 5.0 1.0 4.0 8.0 1.0 9.0 ns Output enable time t PZH 5.0 1.0 5.0 10.0 1.0 11.0 ns Output enable time t PZL 5.0 1.0 5.5 10.0 1.0 12.0 ns Output disable time t PHZ 5.0 1.0 5.5 10.0 1.0 11.0 ns Output disable time t PLZ 5.0 1.0 5.0 10.0 1.0 11.0 ns Note: 1. Voltage Range 5.0 is 5.0 V ± 0.5 V Capacitance Item Symbol Typ Unit Condition Input capacitance CIN 4.5 pF VCC = 5.5 V Input/output capacitance CI/O 15.0 pF VCC = 5.5 V Power dissipation capacitance CPD 45.0 pF VCC = 5.0 V 4 Unit: mm 24.50 25.40 Max 6.30 11 1 7.00 Max 20 10 1.30 2.54 ± 0.25 0.48 ± 0.10 0.51 Min 1.27 Max 2.54 Min 5.08 Max 0.89 7.62 + 0.11 0.25 – 0.05 0° – 15° Hitachi Code JEDEC EIAJ Weight (reference value) DP-20N — Conforms 1.26 g Unit: mm 12.6 13 Max 11 1 10 1.27 *0.42 ± 0.08 0.40 ± 0.06 0.10 ± 0.10 0.80 Max *0.22 ± 0.05 0.20 ± 0.04 2.20 Max 5.5 20 0.20 7.80 +– 0.30 1.15 0° – 8° 0.70 ± 0.20 0.15 0.12 M *Dimension including the plating thickness Base material dimension Hitachi Code JEDEC EIAJ Weight (reference value) FP-20DA — Conforms 0.31 g Unit: mm 12.8 13.2 Max 11 1 10 0.20 ± 0.10 0.935 Max 1.27 *0.42 ± 0.08 0.40 ± 0.06 *0.27 ± 0.05 0.25 ± 0.04 2.65 Max 7.50 20 0.25 10.40 +– 0.40 1.45 0° – 8° 0.57 0.70 +– 0.30 0.15 0.12 M *Dimension including the plating thickness Base material dimension Hitachi Code JEDEC EIAJ Weight (reference value) FP-20DB Conforms — 0.52 g Unit: mm 6.50 6.80 Max 11 1 10 4.40 20 0.65 *0.22+0.08 –0.07 0.20 ± 0.06 1.0 0.13 M 6.40 ± 0.20 *Dimension including the plating thickness Base material dimension 0.07 +0.03 –0.04 0.10 *0.17 ± 0.05 0.15 ± 0.04 1.10 Max 0.65 Max 0° – 8° 0.50 ± 0.10 Hitachi Code JEDEC EIAJ Weight (reference value) TTP-20DA — — 0.07 g Cautions 1. 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