DS83C520-QNL datasheet(3/42 Pages) DALLAS

Part #	DS83C520-QNL

Description	EPROM/ROM High-Speed Micro

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Manufacturer	DALLAS [Dallas Semiconductor]

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DS87C520/DS83C520

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DS87C530/DS83C520 BLOCK DIAGRAM Figure 1

PIN DESCRIPTION Table 1

DIP

PLCC

TQFP

SIGNAL

NAME

DESCRIPTION

40

44

38

VCC

VCC - +5V

20

22,23,

1

16, 17,

39

GND

GND - Digital circuit ground.

9

10

4

RST

RST - 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

19

20

21

14

15

XTAL2

XTAL1

XTAL1, XTAL2 - The 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

PSEN - Output. The Program Store Enable output. This

signal is commonly connected to optional external ROM

memory as a chip enable.

PSEN will provide an active

low pulse and is driven high when external ROM is not

being accessed.

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DS83C520-QNL Datasheet(PDF) 3 Page - Dallas Semiconductor

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