HD68A44

The HD68A44 is designed as one kind of direct memory access controller (DMAC) that pweforms the function of transfering data directly between memory and peripheral device controllers. This device controls the address and data buses in plase of the MPU in bus organized systems such as the HMCS6800 microprocessor system.

Features of the HD68A44 are:(1)On card error correction;(2)System specification version 3.1 compliant;(3)Block and partial block read supported (Command classes 2);(4)Stream read supported (Command class 1);(5)High speed serial interface with random access;(6)4kV ESD protection (Contact Pads);(7)Damage free powered card insertion and removal (no operation);(8)No external programming voltage required;(9)VCC = 2.7 V to 3.6 V operation voltage range (VCC = 2.0 V to 3.6 V for the interface);(10)Read block size programmable between 1 and 2048 bytes.

The absolute maximum ratings of the HD68A44 can be summarized as:(1)Supply voltage:0.3 to +7.0 V;(2)Total power dissipation: 0.5 W;(3)Low-level output current: 10 mA;(4)High-level output current: 16 mA;(5)Output voltage: 2.4 V;(6)Input voltage: -0.3 to Vcc;(7)Non Contact Pads air discharge:16 to 16 kV;(8)Non Contact Pads coupling plane discharge:8 to 8 kV. If you want to know more information such as the electrical characteristics about theHD68A44, please download the datasheet in www.seekic.com or www.chinaicmart.com .