Recommended Cleaning Procedures

The DS2045 may be cleaned using aqueous-based

cleaning solutions. No special precautions are needed

when cleaning boards containing a DS2045 module.

Removal of the topside label violates the environmen-

tal integrity of the package and voids the warranty of

the product.

Applications Information

Power-Supply Decoupling

To achieve the best results when using the DS2045,

decouple the power supply with a 0.1µF capacitor. Use

a high-quality, ceramic surface-mount capacitor if pos-

sible. Surface-mount components minimize lead induc-

tance, which improves performance, while ceramic

capacitors have adequately high frequency response

for decoupling applications.

Using the Open-Drain

RST Output

The RST output is open drain, and therefore requires a

pullup resistor to realize a high logic output level. Pullup

resistor values between 1k

Ω and 10kΩ are typical.

Battery Charging/Lifetime

The DS2045 charges an ML battery to maximum

capacity in approximately 96 hours of operation when

The DS2045 can maintain data from a single, initial

charge for up to 3 years. Once recharged, this deep-

discharge cycle can be repeated up to 20 times, pro-

ducing a worst-case service life of 60 years. More

typical duty cycles are of shorter duration, enabling the

DS2045 to be charged hundreds of times, therefore

extending the service life well beyond 60 years.

DS2045Y/AB Single-Piece 1Mb

Nonvolatile SRAM

____________________________________________________________________

11

Note: All temperatures refer to top side of the package, mea-

sured on the package body surface.

PROFILE FEATURE

Sn-Pb EUTECTIC

ASSEMBLY

Average ramp-up rate

3

°C/second max

Preheat

- Time (min to max) (ts)

100

°C

150

°C

60 to 120 seconds

- Ramp-up rate

Time maintained above:

183

°C

60 to 150 seconds

225 +0/-5

°C

Time within 5

°C of actual peak

10 to 30 seconds

Ramp-down rate

6

°C/second max

Time 25

°C to peak temperature

6 minutes max

Recommended Reflow Temperature Profile