Rainbow Electronics DS1500 - Manual (Page 10)

DS1500 Y2KC Watchdog RTC with Nonvolatile Control
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Figure 7. Block Diagram
Figure 8. Typical Crystal Layout
CRYSTAL
X1
X2
GND
LOCAL GROUND PLANE (LAYER 2)
V
CCO
RST
PWR
CEO
256 x 8
NV SRAM
POWER CONTROL
WRITE PROTECTION,
AND POWER-ON
RESET
16 x 8
CLOCK AND CONTROL
REGISTERS
V
BAT
V
BAT
V
BAUX
GND
KS
CEI
A0–A4
DQ0–DQ7
CS
WE
OE
X1
X2
32.768kHz CLOCK
OSCILLATOR
IRQ
SQW
CLOCK ALARM AND WATCHDOG
COUNTDOWN
Dallas
Semiconductor
DS1500