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74F656A 데이터시트(PDF) 2 Page - NXP Semiconductors |
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2 / 12 page Philips Semiconductors Product specification 74F655A* 74F656A Buffers/drivers 74F655A Octal buffer/driver with parity, inverting (3-State) 74F656A Octal buffer/driver with parity, non-inverting (3-State) 2 1991 Jul 17 853-0383 03305 * Discontinued part. Please see the Discontinued Products List. FEATURES • Significantly improved AC performance over 74F655 and 74F656 • High impedance NPN base input for reduced loading (40 µA in High and Low states) • Ideal in applications where high output drive and light bus loading are required (IIL is 40µA vs. FAST std of 600µA) • 74F655A combines 74F240 and 74F280A functions in one package • 74F656A combines 74F244 and 74F280A functions in one package • 74F655A Inverting • 74F656A Non-inverting • 3-State outputs sink 64mA and source 15mA • 24-pin plastic Slim DIP (300mil) package • Inputs on one side and outputs on the other side simplifies PC board layout • Combined functions reduce part count and enhance system performance • Industrial temperature range available (–40°C to +85°C) DESCRIPTION The 74F655A and 74F656A 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) 74F655A 6.5ns 64mA 74F656A 6.5ns 64mA ORDERING INFORMATION DESCRIPTION COMMERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C INDUSTRIAL RANGE VCC = 5V ±10%, Tamb = –40°C to +85°C PKG DWG # 24-pin Plastic Slim DIP (300mil) N74F656AN I74F656AN SOT222-1 24-pin Plastic SOL N74F656AD I74F656AD 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, OE2 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 (74F655A) 750/106.7 15mA/64mA Q0–Q7 Data outputs (74F656A) 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. |
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