4265 INTEL | Alldatasheet
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. t I ® Multi-Mode 14 Operating Modes @ TTL Interface @ 16 Lines of I/O Capability ™ Up to Eight 4265s Per System @ Bit Set/Reset @ Interface to Standard RAMs ® Multiplexable Outputs ™ 28 Pin Dual-In-Line Package = Eight Bit Transfer Mode ® Interface to Standard RAMs @ Interfaces to 8080 Peripherals @ 28 Pin Dual-In-Line Package @ Synchronous and Asynchronous ™ Standard Operating Temperature Interface Range of 0° to 70°C ® Strobed Buffer Inputs and Outputs ® Also Available with -40° to +85°C Operating Range The 4265 is a general purpose I/O device designed to interface with the MCS-40™ microcomputer family. This device provides tour software programmable 4-bit 1/O ports which can be configured to allow any one of fourteen unique operating modes for MME interfacing to data memory or a variety of user peripheral devices. BEE A single MCS-40 system can accomodate up to four 4265s (one per CM-RAM) without external logic or up to eight 4265s with SE one external decoder The 4265 resides on the MCS-40 data bus and uses the same selection procedure as 4002 RAM device. A valid compare selects the 4265 for MCS-40 1/0 commands. As in the case of the 4002 or any MCS-40 peripheral circuit, selection occurs only when the proper SRC code and the CM signal are present simultaneously The 4265 provides an extremely flexible, general purpose I/O system capable of handling 4- or 8-bit input or output data. One of fourteen basic operating modes can be selected (software programmable) as described below Port Z is TTL compatible with any TTL device. Ports W, X, and Y are low-power TTL compatible. PIN CONFIGURATION “sQ" 22D) voo o, 2 2D», a Dm, os sD, os aw, neser Co aD ewan? aD», sync Of ax, io ax, sho »Py, an »Py ze vpy,
2 Dy,
2 157) Yor