DS32kHz

5 of 8

PIN DESCRIPTION

PIN

SO

BGA

DIP

NAME

FUNCTION

1

C4, C5, D4, D5

12

32kHz

32.768kHz Push-Pull Output

2

C2, C3, D2, D3

13

Primary Power Supply

3–12, 15, 16

A7, A8, B7, B8,

C7, C8, D7, D8

1, 6–11, 14

N.C.

No Connection (Must be grounded)

13

All remaining

balls

4

GND

Ground

14

A4, A5, B4, B5

5

+3V Nominal Supply Input. Used to operate the

Figure 2. Delta Time and Frequency vs. Temperature

FUNCTIONAL DESCRIPTION

The DS32kHz is a temperature-compensated crystal oscillator (TCXO) that outputs a 32,768Hz square wave.

While the DS32kHz is powered by either supply input, the device measures the temperature every 64 seconds and

32kHz output in the absence of power. Once every 64 seconds, the DS32kHz measures the temperature and

adjusts the output frequency. The output is accurate to ±2ppm (±1 min/yr) from 0°C to +40°C and to ±7.5ppm

(±4 min/year) from -40°C to 0°C and from +40°C to +85°C.

-200

-180

-160

-140

-120

-100

-80

-60

-40

-20

0

20

-40

-30

-20

-10

0

10

203040

50

607080

Temperature (°C)

-100

-80

-60

-40

-20

0

Typical Crystal,

Uncompensated

DS32kHz

Accuracy

Band

Crystal +20ppm

Crystal -20ppm