70 ns access time — what it means for the bus
The DS1245Y-70IND+ is a 1Mbit non-volatile SRAM from Analog Devices, organized as 128K x 8 bits with a parallel interface. Its 70 ns access time is the cycle-limiting spec for read and write operations: a 70 ns window means the memory can complete a data transfer within that period, which sets the bus timing margin for the host controller. For a microcontroller with a 12.5 MHz or slower external bus, this part fits without wait states; faster controllers may need to insert one or more wait cycles to meet the 70 ns requirement.
NVSRAM: SRAM speed with non-volatile retention
NVSRAM technology combines the fast read/write of a standard SRAM with an internal lithium battery and shadow EEPROM array. On power loss, the SRAM content is automatically copied to the EEPROM; on power-up, it is restored. This gives unlimited write endurance during normal operation (no wear-leveling needed) and data retention for years without power. The 70 ns write cycle time matches the read access time, so back-to-back writes run at full bus speed — unlike serial EEPROM or Flash, which have much longer write cycles.
Industrial temperature grade and package
Rated for -40°C to 85°C ambient, the DS1245Y-70IND+ is suited for industrial control, outdoor telecom, and automotive cabin applications where temperature extremes occur. The 32-pin EDIP (0.600" body, 15.24 mm pitch) is a through-hole module that includes the battery and controller in one sealed package. The 'IND' suffix in the ordering code designates the industrial temperature range; the '+' indicates RoHS3 compliance.
Lifecycle and supply posture
It is RoHS3 compliant. For BOM planning, this part can be specified into new designs without last-time-buy risk.