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DS87C520-QNL Datasheet(PDF) 4 Page - Maxim Integrated Products |
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DS87C520-QNL Datasheet(HTML) 4 Page - Maxim Integrated Products |
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4 / 43 page  DS87C520/DS83C520 EPROM/ROM High-Speed Microcontrollers 4 of 43 Figure 1. Block Diagram PIN DESCRIPTION PIN DIP PLCC TQFP NAME FUNCTION 40 44 38 VCC Positive Supply Voltage. +5V 20 1, 22, 23 16, 17, 39 GND Digital Circuit Ground 9 10 4 RST Reset Input. The RST input pin contains a Schmitt voltage input to recognize external active high Reset inputs. The pin also employs an internal pulldown resistor to allow for a combination of wired OR external reset sources. An RC is not required for power-up, as the device provides this function internally. 18 20 14 XTAL2 19 21 15 XTAL1 Crystal Oscillator Pins. XTAL1 and XTAL2 provide support for parallel-resonant, AT-cut crystals. XTAL1 acts also as an input if there is an external clock source in place of a crystal. XTAL2 serves as the output of the crystal amplifier. 29 32 26 PSEN Program Store-Enable Output. This active-low signal is commonly connected to optional external ROM memory as a chip enable. PSEN provides an active-low pulse and is driven high when external ROM is not being accessed. DS87C520/ DS83C520 |
Similar Part No. - DS87C520-QNL |
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Similar Description - DS87C520-QNL |
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