Z8420

The Z8420 is a programmable, dual-port device that provides a TTL-compatible interface between peripheral devices and the Z80 CPU. The features of Z8420 can be summarized as (1)provides a direct interface between Z80 microcomputer system and periheral devices; (2)both ports have interrupt-driven handshark for fast response; (3)four programmable opearting modes; (4)programmable interrupts on peripheral status conditions.

The absolute maximum ratings of the Z8420 are: (1)voltage on all inputs and outputs with respect to GND: -0.3 to +7.0 V; (2)operating ambient temperature: as specified in order codes; (3)storage temperature: -65 to +150.

The following is about the electrical characteristics of Z8420: (1)clock input low voltage: -0.3V min and +0.45V max; (2)clock input high voltage: VCC-0.6V min and VCC+0.3V max; (3)input high voltage: 2.0V min and VCC max; (4)input low voltage: -0.3V min and 0.8V max; (5)output low voltage: 0.4V max at ILO=2.0mA; (6)output high voltage: VCC-0.8V min at IOH=-250A; (7)input leakage voltage: -10A min and 10A max at VIN=0.4V to VCC; (8)3-state output leakage current in float: -10A min and 10A max at VOUT=0.4V to VCC.