HD74HC640

HD74HC640, HD74HC643 Octal Bus Transceivers (with 3-state outputs) REJ03D0637-0200 (Previous ADE-205-517) Rev.2.00 Mar 30, 2006 Description Each device has an active enable G and a direction control input, DIR. When DIR is high, data flows from the A inputs to the B outputs. When DIR is low, data flows from the B inputs to the A outputs. The HD74HC640 transfers inverted data from one bus to other and the HD74HC643 transfers inverted data from the A bus to the B bus and true data from the B bus to the A bus. Features High Speed Operation: tpd = 12 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) Ordering Information Part Name Package Type Package Code (Previous Code) Package Abbreviation HD74HC640P DILP-20 pin PRDP0020AC-B (DP-20NEV) P HD74HC640FPEL SOP-20 pin (JEITA) PRSP0020DD-B (FP-20DAV) FP HD74HC640RPEL SOP-20 pin (JEDEC) HD74HC643RPEL PRSP0020DC-A RP (FP-20DBV) Note: Please consult the sales office for the above package availability. Taping Abbreviation (Quantity) — EL (2,000 pcs/reel) EL (1,000 pcs/reel) Function Table Control Inputs G DIR LL LH HX H : high level L : low level X : irrelevant HD74HC640 B data to A bus A data to B bus Isolation Operation HD74HC643 B data to A bus A data to B bus Isolation Rev.2.00 Mar 30, 2006 page 1 of 10 HD74HC640, HD74HC643 Pin Arrangement HD74HC64...