DS87C520 Ver la hoja de datos (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS87C520

EPROM/ROM High-Speed Microcontrollers

Dallas Semiconductor -> Maxim Integrated 

Figure 1. Block Diagram

DS87C520/DS83C520 EPROM/ROM High-Speed Microcontrollers

DS87C520/

DS83C520

PIN DESCRIPTION

PIN

DIP

PLCC

TQFP

40

44

38

20

1, 22, 23 16, 17, 39

9

10

4

18

20

14

19

21

15

29

32

26

NAME

VCC

GND

RST

XTAL2

XTAL1

PSEN

FUNCTION

Positive Supply Voltage. +5V

Digital Circuit Ground

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.

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.

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.

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