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DS83C520 Datasheet(PDF) 3 Page - Dallas Semiconductor

Part # DS83C520
Description  EPROM/ROM High-Speed Micro
PDF  42 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
3 of 42
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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