HD74HC244

HD74HC244 Octal Buffers/Line Drivers/Line Receivers (with noninverted 3-state outputs) Description The HD74HC244 is a non-inverting buffer and has two active low enables (1G and 2G ). Each enable independently controls 4 buffers. This device does not have schmitt trigger inputs. Features High Speed Operation: tpd = 11 ns typ (CL = 50 pF) High Output Current: Fanout of 15 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) Function Table Inputs G H L L A X H L Output Y Z H L Notes H: high level L: low level X: irrelevant Z: off (high-impedance) state of a 3-state output HD74HC244 Pin Arrangement 1G1 1A1 2Y4 1A2 2Y3 1A3 2Y2 1A4 2Y1 1 2 3 4 5 6 7 8 9 20 VCC 19 2G 18 1Y1 17 2A4 16 1Y2 15 2A3 14 1Y3 13 2A2 12 1Y4 11 2A1 (Top view) GND 10 Absolute Maximum Ratings Item Supply voltage range Input voltage Output voltage DC current drain per pin DC current drain per VCC, GND DC input diode current DC output diode current Power Dissipation per package Storage temperature Symbol VCC VIN VOUT I OUT I CC, I GND I IK I OK PT Tstg Rating –0.5 to +7.0 –0.5 to VCC + 0.5 –0.5 to VCC + 0.5 ±35 ±75 ±20 ±20 500 –65 to +150 Unit V V V mA mA mA mA mW °C 2 HD74HC244 Logic Diagram To three other 7 inverters One of 8 inverters VCC Input A Y Strobe G 3 HD74HC244 DC Characteristics Ta = 25°C Item Input voltage Symbol VIH Ta = –40 to +85°C Max — — — 0.5 1.35 1.8 — — — — — 0.1 0.1 0.1 0.33...