Maxim Integrated DS1743-100

Description
The DS1743/DS1743PY2K is a nonvolatile timekeeping RAM that integrates an NV SRAM, real-time clock, crystal, power-fail control circuit, and lithium energy source. The clock registers are accessed identically to the static RAM and reside in the eight top RAM locations. It features a century byte register and is totally nonvolatile with over 10 years of operation in the absence of power. The BCD-coded century, year, month, date, day, hours, minutes, and seconds with automatic leap year compensation are valid through 2099. The device has a low-battery-voltage level indicator flag and power-fail write protection that allows for ±10% Vcc power-supply tolerance. The lithium energy source is electrically disconnected to retain freshness until power is applied for the first time. The DIP module has a standard JEDEC bytewide 8k x 8 static RAM pinout, while the PowerCap module board is a surface-mountable package for direct connection to the PowerCap containing the battery and crystal. The PowerCap is replaceable, and the device has a power-on reset output. It is pin-for-pin compatible with other densities of DS174XP timekeeping RAM and is UL recognized to prevent charging of the internal lithium battery.

Features
Integrated NV SRAM, real-time clock, crystal, power-fail control circuit, and lithium energy source
Clock registers accessed identically to static RAM
Century byte register
Totally nonvolatile with over 10 years of operation in the absence of power
BCD-coded century, year, month, date, day, hours, minutes, and seconds with automatic leap year compensation valid through 2099
Low-battery-voltage level indicator flag
Power-fail write protection allows for ±10% Vcc power-supply tolerance
Lithium energy source electrically disconnected to retain freshness until power is applied for the first time
DIP module with standard JEDEC bytewide 8k x 8 static RAM pinout
PowerCap module board for direct connection to PowerCap containing battery and crystal
Replaceable battery (PowerCap)
Power-on reset output
Pin-for-pin compatible with other densities of DS174XP timekeeping RAM
UL recognized to prevent charging of the internal lithium battery

Applications
Timekeeping and date stamping
Real-time clocks
Calendar functions
Data logging
Industrial control
Medical devices
Security systems
Point-of-sale terminals
Battery-powered applications