DS1386 DALLAS [Dallas Semiconductor], DS1386 Datasheet - Page 2

• Manufacturer Part Number: DS1386
• Description: RAMified Watchdog Timekeeper
• Manufacturer: DALLAS [Dallas Semiconductor]

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
maintain data and real time for over ten years in the absence of V
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.
ORDERING INFORMATION
DS1386
*DS1386P
*DS9034PCX
PIN DESCRIPTION
A0-A14
DQ0-DQ7
V
GND
SQW
NC
X1, X2
V
INTA
INTB
CE
OE
WE
CC
BAT
(INTB)
CC
and write protects memory when V
- Interrupt Output A (open drain)
- Interrupt Output B (open drain)
- Address Inputs
- Data Input/Output
- Chip Enable
- Output Enable
- Write Enable
- +5V
- Ground
- Square Wave Output
- No Connection
- Crystal Connection
- Battery Connection
XX-120
PowerCap required
XX-120
(must be ordered separately)
32-pin DIP Module
08
32
34-pin PowerCap
08
32
8k x 8 NV SRAM
32k x 8 NV SRAM
8k x 8 NV SRAM
32k x 8 NV SRAM
2 of 20
®
CC
Module Board
is out of tolerance. The lithium energy source can
CC
. Timekeeper information includes