DS87C530_1 Datasheet, PDF (3/44 Pages) Dallas Semiconductor – EPROM/ROM Micro with Real Time Clock

DS87C530/DS83C530 BLOCK DIAGRAM Figure 1
DS87C530/DS83C530
PIN DESCRIPTION Table 1
PLCC TQFP SIGNAL
NAME
DESCRIPTION
52
1, 25
45
18, 46
V_CC
GND
V_CC - +5V. Processor power supply.
GND - Processor digital circuit ground.
29
22
V_CC2
V_CC2 - +5V Real Time Clock supply. V_CC2 is isolated from V_CC to
isolate the RTC from digital noise.
26
19
GND2 GND2 - Real Time Clock circuit ground.
12
5
RST
RST - Input. This 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.
23
16
XTAL2 XTAL1, XTAL2 - The crystal oscillator pins provide support for
24
17
XTAL1 parallel resonant, AT cut crystals. XTAL1 acts also as an input if
there is an external clock source in place of a crystal. XTAL2 is
the output of the crystal amplifier.
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