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74ALS648-1D 데이터시트(PDF) 2 Page - NXP Semiconductors |
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74ALS648-1D 데이터시트(HTML) 2 Page - NXP Semiconductors |
2 / 13 page Philips Semiconductors Product specification 74ALS646/74ALS646-1 74ALS648/74ALS648-1 Transceiver/register 74ALS646/646-1 Octal transceiver/register, non-inverting (3-State) 74ALS648/648-1 Octal transceiver/register, inverting (3-State) 2 1991 Feb 08 853–1408 01670 FEATURES • Combines 74ALS245 and two 74ALS374 type functions in one chip • Independent registers for A and B buses • Multiplexed real-time and stored data • Choice of non-inverting and inverting data paths • 3-State outputs • The -1 version sink 48mA I OL within the ±5% VCC range DESCRIPTION The 74ALS646/74ALS646-1 and 74ALS648/74ALS648-1 transceivers/registers consist of bus transceiver circuits with 3-State outputs, D-type flip-flops, and control circuitry arranged for multiplexed transmission of data directly from the input bus or the internal registers. Data on the A or B bus will be clocked into the registers as the appropriate clock pin goes High. Output enable (OE) and direction (DIR) and select (SAB, SBA) pins are provided for bus management. The 74ALS646-1 and 74ALS648-1 will sink 48mA if the VCC is limited to 5.0V ±0.25V. TYPE TYPICAL fMAX TYPICAL SUPPLY CURRENT (TOTAL) 74ALS646/646-1 140MHz 48mA 74ALS648/648-1 140MHz 54mA ORDERING INFORMATION ORDER CODE DESCRIPTION COMMERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C DRAWING NUMBER 24-pin plastic DIP 74ALS646N, 74ALS646-1N, 74ALS648N, 74ALS648-1N SOT222-1 24-pin plastic SOL 74ALS646D, 74ALS646-1D, 74ALS648D, 74ALS648-1D SOT137-1 INPUT AND OUTPUT LOADING AND FAN-OUT TABLE PINS DESCRIPTION 74ALS (U.L.) HIGH/LOW LOAD VALUE HIGH/LOW A0 – A7 A inputs 1.0/1.0 20 µA/0.1mA B0 – B7 B inputs 1.0/1.0 20 µA/0.1mA CPAB A-to-B clock input 1.0/1.0 20 µA/0.1mA CPBA B-to-A clock input 1.0/1.0 20 µA/0.1mA SAB A-to-B select input 1.0/1.0 20 µA/0.1mA SBA B-to-A select input 1.0/1.0 20 µA/0.1mA DIR Data flow directional control input 1.0/1.0 20 µA/0.1mA OE Output enable input 1.0/1.0 20 µA/0.1mA A0 – A7, B0 – B7 Data outputs 750/240 15mA/24mA A0 – A7, B0 – B7 Data outputs (-1 version) 750/480 15mA/48mA NOTE: One (1.0) ALS unit load is defined as: 20 µA in the High state and 0.1mA in the Low state. |
유사한 부품 번호 - 74ALS648-1D |
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유사한 설명 - 74ALS648-1D |
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