Rainbow Electronics DS1386 - Manual (Page 2)

DS1386/DS1386P
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ORDERING INFORMATION
DS1386 XX-120 32-pin DIP Module
08 8k x 8 NV SRAM
32 32k x 8 NV SRAM
*DS1386P XX-120 34-pin PowerCap ® Module Board
08 8k x 8 NV SRAM
32 32k x 8 NV SRAM
*DS9034PCX PowerCap required
(must be ordered separately)
PIN DESCRIPTION
INTA - Interrupt Output A (open drain)
INTB (INTB) - Interrupt Output B (open drain)
A0-A14 - Address Inputs
DQ0-DQ7 - Data Input/Output
CE - Chip Enable
OE - Output Enable
WE - Write Enable
V
CC
- +5V
GND - Ground
SQW - Square Wave Output
NC - No Connection
X1, X2 - Crystal Connection
V
BAT
- Battery Connection
DESCRIPTION
The DS1386 is a nonvolatile static RAM with a full-function Real Time Clock (RTC), alarm, watchdog
timer, and interval timer which are all accessible in a byte-wide format. The DS1386 contains a lithium
energy source and a quartz crystal, which eliminates the need for any external circuitry. Data contained
within 8k or 32k by 8-bit memory and the timekeeping registers can be read or written in the same
manner as bytewide static RAM. The timekeeping registers are located in the first 14 bytes of memory
space. Data is maintained in the RAMified Timekeeper by intelligent control circuitry, which detects the
status of V
CC
and write protects memory when V
CC
is out of tolerance. The lithium energy source can
maintain data and real time for over ten years in the absence of V
CC
. Timekeeper information includes
hundredths of seconds, seconds, minutes, hours, day, date, month, and year. The date at the end of the
month is automatically adjusted for months with less than 31 days, including correction for leap year.
The RAMified Timekeeper operates in either 24-hour or 12-hour format with an AM/PM indicator. The
watchdog timer provides alarm interrupts and interval timing between 0.01seconds and 99.99 seconds.
The real time alarm provides for preset times of up to one week. Interrupts for both watchdog and RTC
will operate when system is powered down. Either can provide system “wake-up” signals.