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DS83C520 Datasheet(PDF) 3 Page - Dallas Semiconductor

Part # DS83C520
Description  EPROM/ROM High-Speed Microcontrollers
PDF  44 Pages
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Manufacturer  DALLAS [Dallas Semiconductor]
Direct Link  https://www.maximintegrated.com/en.html
Logo DALLAS - Dallas Semiconductor

DS83C520 Datasheet(HTML) 3 Page - Dallas Semiconductor

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DS87C520/DS83C520 EPROM/ROM High-Speed Microcontrollers
3 of 44
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



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