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74F244B 数据表(PDF) 2 Page - NXP Semiconductors |
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74F244B 数据表(HTML) 2 Page - NXP Semiconductors |
2 / 12 page Philips Semiconductors Product specification 74F244/74F244B Octal buffers (3-State) 2 1994 Dec 5 853-0357 14381 FEATURES • Octal bus interface • 3-State output buffer sink 64mA • 15mA source current • Guaranteed output skew less than 2.0ns (74F244B) • Reduced ground bounce (74F244B) • Reduced I CC (74F244B) • Reduced loading (74F244B I IL = 40µA) • Split lead frame offers increased noise immunity (74F244B) • Industrial temperature range available (-40°C to +85°C) for 74F244 • 74F244 available in SSOP Type II package DESCRIPTION The 74F244 is an octal buffer that is ideal for driving bus lines of buffer memory address registers. The outputs are all capable of sinking 64mA and sourcing up to 15mA, producing very good capacitive drive characteristics. The device features two output enables, OEa and OEb, each controlling four of the 3-State outputs. The 74F244B is functionally equivalent to the 74F244. It has been designed to reduce effects of ground noise. Other advantages are noted in the features. TYPE TYPICAL PROPAGATION DELAY TYPICAL SUPPLY CURRENT (TOTAL) 74F244 4.0ns 53mA 74F244B 4.0ns 33mA ORDERING INFORMATION ORDER CODE COMMERCIAL RANGE INDUSTRIAL RANGE PKG DWG # DESCRIPTION VCC = 5V ±10%, VCC = 5V ±10%, PKG DWG # Tamb = 0°C to +70°C Tamb = -40°C to +85°C 20-pin plastic DIP N74F244N, N74F244BN I74F244N SOT146-1 20-pin plastic SOL N74F244D, N74F244BD I74F244D SOT163-1 20-pin plastic SSOP II N74F244DB SOT339-1 INPUT AND OUTPUT LOADING AND FAN OUT TABLE PINS DESCRIPTION 74F (U.L.) HIGH/LOW LOAD VALUE HIGH/LOW Ian, Ibn Data inputs (74F244) 1.0/2.67 20 µA/1.6mA Data inputs (74F244B) 1.0/0.067 20 µA/40µA OEa, OEb Output enable inputs (active low) (74F244) 1.0/1.67 20 µA/1.0mA Output enable inputs (active low) (74F244B) 1.0/0.067 20 µA/40µA Yan, Ybn Data outputs 750/106.7 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. PIN CONFIGURATION 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 VCC OEa Ia0 Yb0 Ia1 Yb1 Ia2 Yb2 Ia3 Yb3 GND SF00227 OEb Ya0 Ib0 Ya1 Ib1 Ya2 Ib2 Ya3 Ib3 LOGIC SYMBOL OEa 1 SF00228 2 4 6 8 17 15 13 11 18 16 14 12 3 5 7 9 Ia0 Ia1 Ia2 Ia3 Ib0 Ib1 Ib2 Ib3 Ya0 Ya1 Ya2 Ya3 Yb0 Yb1 Yb2 Yb3 VCC = Pin 20 GND = Pin 10 OEb 19 |
类似零件编号 - 74F244B |
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类似说明 - 74F244B |
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