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74F455 Folha de dados(PDF) 2 Page - NXP Semiconductors |
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74F455 Folha de dados(HTML) 2 Page - NXP Semiconductors |
2 / 12 page Philips Semiconductors Product specification 74F455,* 74F456 Buffers/Drivers 74F455 Octal Buffer/Driver with Parity, Inverting (3-State) 74F456 Octal Buffer/Driver with Parity, Non-Inverting (3-State) 2 1999 Jan 08 853–0371 20616 * Discontinued part. Please see the Discontinued Products List. FEATURES • High impedance NPN base inputs for reduced loading (40 µA in High and Low states) • 74F456 combines 74F244 and 74F280A functions in one package • 74F456 is a center pin version of the 74F656A • 74F456 Non-Inverting • 3-State outputs sink 64mA and source 15mA • 24-pin plastic Slim DIP (300 mil) package • Broadside pinout simplifies PC board layout DESCRIPTION The 74F455 and 74F456 are octal buffers and line drivers with parity generation/checking designed to be employed as memory address drivers, clock drivers and bus-oriented transmitters/receivers. These parts include parity generator/checker to improve PC board density. TYPE TYPICAL PROPAGATION DELAY TYPICAL SUPPLY CURRENT (TOTAL) 74F455 6.5ns 64mA 74F456 7.5ns 64mA ORDERING INFORMATION DESCRIPTION COMMERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C PKG DWG # 24-pin plastic Slim DIP (300mil) N74456N SOT222-1 24-pin plastic SOL N74456D SOT137-1 INPUT AND OUTPUT LOADING AND FAN-OUT TABLE PINS DESCRIPTION 74F(U.L.) HIGH/LOW LOAD VALUE HIGH/LOW D0–D7 Data inputs 2.0/0.066 40 µA/40µA PI Parity input 1.0/0.033 20 µA/20µA OE0, OE1 Output Enable inputs (active Low) 1.0/0.033 20 µA/20µA ΣE, ΣO Parity outputs 750/106.7 15mA/64mA Q0–Q7 Data outputs (75F455) 750/106.7 15mA/64mA Q0–Q7 Data outputs (75F456) 750/106.7 15mA/64mA NOTE: One (1.0) FAST Unit Load (U.L.) is defined as 20 µA in the High state and 0.6mA in the Low state. PIN CONFIGURATION – 74F455 24 23 22 21 20 19 18 17 16 15 14 13 12 10 11 9 8 7 6 5 4 3 2 1 OE0 OE1 PI D0 D1 D2 D3 D4 D5 D6 D7 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 ΣE ΣO GND GND VCC SF00969 PIN CONFIGURATION – 74F456 24 23 22 21 20 19 18 17 16 15 14 13 12 10 11 9 8 7 6 5 4 3 2 1 OE0 OE1 PI D0 D1 D2 D3 D4 D5 D6 D7 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 ΣE ΣO GND GND VCC SF00958 |
Nº de peça semelhante - 74F455 |
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Descrição semelhante - 74F455 |
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