DS87C530-ENL+ DALLAS [Dallas Semiconductor], DS87C530-ENL+ Datasheet - Page 4

• Manufacturer Part Number: DS87C530-ENL+
• Description: EPROM/ROM Microcontrollers with Real-Time Clock
• Manufacturer: DALLAS [Dallas Semiconductor]

Figure 1. Block Diagram
PIN DESCRIPTION
PLCC
1, 25
52
29
26
12
23
24
PIN
TQFP
18, 46
45
22
19
16
17
5
XTAL2
XTAL1
NAME
GND2
GND
V
RST
V
CC2
CC
+5V Processor Power Supply
Processor Digital Circuit Ground
+5V RTC Supply. V
RTC Circuit Ground
Reset 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.
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 is the output of the crystal amplifier.
DS87C530/
DS83C530
4 of 47
CC2
is isolated from V
FUNCTION
CC
to isolate the RTC from digital noise.