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74ALS645AN Datenblatt(PDF) 2 Page - NXP Semiconductors |
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74ALS645AN Datenblatt(HTML) 2 Page - NXP Semiconductors |
2 / 8 page Philips Semiconductors Product specification 74ALS645A/74ALS645A-1 Octal transceiver (3-State) 2 1991 Jun 03 853–0597 02709 FEATURES • Octal bidirectional bus interface • 3-State buffer outputs sink 24mA and source 15mA • Outputs are placed in high impedance state during power-off conditions • The -1 version sinks 48mA I OL within the +5% VCC range DESCRIPTION The 74ALS645A is an octal transceiver featuring non-inverting 3-State bus compatible outputs in both transmit and receive directions. The device features an output enable (OE) input for easy cascading and transmit/receive (R/T) input for direction control. The 74ALS645A-1 is the same as the 74ALS645A except that both ports sink 48mA within the ±5% VCC range. TYPE TYPICAL PROPAGATION DELAY TYPICAL SUPPLY CURRENT (TOTAL) 74ALS645A 7.0ns 34mA 74ALS645A-1 7.0ns 34mA PIN CONFIGURATION SF00198 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 T/R A0 A1 A2 A3 A4 A5 A6 A7 GND VCC OE B0 B1 B2 B3 B4 B6 B5 B7 ORDERING INFORMATION ORDER CODE DESCRIPTION COMMERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C DRAWING NUMBER 20-pin plastic DIP 74ALS645AN, 74ALS645A-1N SOT146-1 20-pin plastic SOL 74ALS645AD, 744ALS645A-1D SOT163-1 INPUT AND OUTPUT LOADING AND FAN-OUT TABLE PINS DESCRIPTION 74ALS (U.L.) HIGH/LOW LOAD VALUE HIGH/LOW A0 – A7, B0 – B7 Data inputs 1.0/1.0 20 µA/0.1mA OE Output Enable input (active-Low) 1.0/1.0 20 µA/0.1mA T/R Transmit/receive input 1.0/1.0 20 µA/0.1mA A0 – A7 A port outputs 750/240 15mA/24mA B0 – B7 B port outputs 750/240 15mA/24mA A0 – A7 A port outputs (-1 version) 750/480 15mA/48mA B0 – B7 B port 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. LOGIC SYMBOL B2 B3 B4 B5 16 15 14 13 23 4 VCC = Pin 20 GND = Pin 10 SF00199 B1 17 B0 18 19 1 OE T/R A0 A1 A2 A3 A4 A5 56 7 B6 B7 12 11 A6 A7 89 IEC/IEEE SYMBOL SC00097 G3 19 3EN1 [BA] 1 3EN2 [AB] ∇ 1 2 ∇ 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 |
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