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74AC257 датащи(PDF) 1 Page - STMicroelectronics |
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74AC257 датащи(HTML) 1 Page - STMicroelectronics |
1 / 11 page 1/11 April 2001 s HIGH SPEED: tPD = 4.5ns (TYP.) at VCC = 5V s LOW POWER DISSIPATION: ICC = 4µA(MAX.) at TA=25°C s HIGH NOISE IMMUNITY: VNIH = VNIL = 28 % VCC (MIN.) s 50 Ω TRANSMISSION LINE DRIVING CAPABILITY s SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 24mA (MIN) s BALANCED PROPAGATION DELAYS: tPLH ≅ tPHL s OPERATING VOLTAGE RANGE: VCC (OPR) = 2V to 6V s PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 257 s IMPROVED LATCH-UP IMMUNITY DESCRIPTION The 74AC257 is an advanced high-speed CMOS QUAD 2-CHANNEL MULTIPLEXER (3-STATE) fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS tecnology. It is composed of four independent 2-channel multiplexer with common SELECT and ENABLE (OE) inputs. It is a non-inverting multiplexer. When the OE input is held HIGH,all the output become in high impedance state. If SELECT input is held LOW, "A" data is selected, when SELECT input is held HIGH, "B" data is chosen. All inputs and outputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage. 74AC257 QUAD 2 CHANNEL MULTIPLEXER (3-STATE) PIN CONNECTION AND IEC LOGIC SYMBOLS ORDER CODES PACKAGE TUBE T & R DIP 74AC257B SOP 74AC257M 74AC257MTR TSSOP 74AC257TTR TSSOP DIP SOP |
Аналогичный номер детали - 74AC257 |
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Аналогичное описание - 74AC257 |
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