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N74F545D Datasheet(PDF) 2 Page - NXP Semiconductors |
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N74F545D Datasheet(HTML) 2 Page - NXP Semiconductors |
2 / 10 page Philips Semiconductors Product specification 74F545 Octal bidirectional transceiver (with 3-State inputs/outputs) 2 1990 Mar 01 853–0375 98992 FEATURES • High impedance NPN base inputs for reduced loading (70 µA in High and Low states) output • 8-bit bidirectional data flow reduces system package count • 3-State inputs/outputs for interfacing with bus oriented systems • 24mA and 64mA bus drive capability on A and B ports, respectively • Transmit/Receive and Output Enable simplify control logic DESCRIPTION The 74F545 is an 8-bit, 3-State, high speed transceiver. It provides bidirectional drive for the bus-oriented microprocessor and digital communications systems. Straight through bidirectional transceivers are featured, with 24mA bus drive capability on the A ports and 64mA bus drive capability on the B ports. One input, Transmit/Receive (T/R) determines the direction of logic signals through the bidirectional transceiver. Transmit enables data from A ports to B ports; Receive enables data from B ports to A ports. The Output Enable input disables both A and B ports by placing them in a 3-State condition. The 74F545 performs the same function as the 74F245, the only difference being package pin assignment. PIN CONFIGURATION 20 19 18 17 16 15 14 13 12 10 11 9 8 7 6 5 4 3 2 1 VCC B0 B1 B4 B5 B6 B7 A0 A1 A4 A5 A7 OE GND B2 B3 A3 A2 SF01032 A6 T/R TYPE TYPICAL PROPAGATION DELAY TYPICAL SUPPLY CURRENT (TOTAL) 74F545 4.0ns 87mA ORDERING INFORMATION DESCRIPTION COMMERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C PKG DWG # 20-Pin Plastic DIP N74F545N SOT146-1 20-Pin Plastic SOL N74F545D SOT163-1 INPUT AND OUTPUT LOADING AND FAN-OUT TABLE PINS DESCRIPTION 74F(U.L.) HIGH/LOW LOAD VALUE HIGH/LOW A0–A7, B0–B7 Data inputs 3.5/0.117 70 µA/70µA OE Output Enable input (active Low) 2.0/0.067 40 µA/40µA T/R Transmit/Receive input 2.0/0.067 40 µA/40µA A0 - A7 Port A 3-State outputs 150/40 3.0mA/24mA B0 - B7 Port B 3-State outputs 750/107 15mA/64mA NOTE: One (1.0) FAST Unit Load is defined as: 20 µA in the High state and 0.6mA in the Low state. |
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