MEMS Ultra-Low Power Oscillator, 32.768 kHz Quartz XTAL Replacement

IM890 Series

ILSI America Phone 775-851-8880 ● Fax 775-851-8882 ●email: e-mail@ilsiamerica.com ●

www.ilsiamerica.com

Specifications subject to change without notice

Rev 05/17/16_B

Page 5 of 10

Page 5 of 10

• NanoDrive™ part number coding: D14.

• Example part number: IM890-ID14-32.768

Figure 4. IM890-ID14-32.768

Output Waveform (10 pF Load)

programming options.

1.225

1.100

1.000

0.900

0.800

0.700

0.600

0.800

D28

D18

D08

0.700

D27

D17

D07

D97

0.525

D26

D16

D06

D96

D86

0.500

D25

D15

D05

D95

D85

D75

0.400

D14

D04

D94

D84

D74

D64

0.350

D13

D03

D93

D83

D73

D63

Table 2 shows the supported AC coupled Swing levels. The

“AC-coupled” terminology refers to the programming

description for applications where the downstream chipset

includes an internal AC-coupling capacitor, and therefore,

relevant.

Table 2. Acceptable AC-Coupled Swing Levels

Swing

0.800

0.700

0.600

0.500

0.400

0.300

0.250

0.200

Output

Code

AA8

AA7

AA6

AA5

AA4

AA3

AA2

AA1

• NanoDrive part number coding: AA2. Example part

number: IM890-4AA2-32.768

• Output voltage swing: 0.250V

The values listed in Tables 1 and -2 are nominal values at

25°C and will exhibit a tolerance of ±55 mV across Vdd and

-40°C to 85°C operating temperature range.

IM890 Full Swing LVCMOS Output

The IM890 can be factory programmed to generate full-

swing LVCMOS levels. Figure 5 shows the typical LVCMOS

waveform (Vdd = 1.8V) at room temperature into a 15 pF

load.

Figure 5. LVCMOS Waveform

Vdd = +1.8 V into 15pF Load

Example:

• LVCMOS output part number coding is always DCC

• Example part number: IM890-4DCC-32.768

Calculating Load Current

No Load Supply Current

When calculating no-load power for the IM890, the core and

output driver components need to be added. Since the output

voltage swing can be programmed for reduced swing between

250 mV and 800 mV, the output driver current is variable.

Therefore, no-load operating supply current is broken into two

sections; core and output driver. The equation is as follows:

Example 1: Full-swing LVCMOS

• Vdd = 1.8V

• Idd Core = 900nA (typ)

Supply Current = 900nA + (65nA/V)(1.8V) =1017nA

Example 2: NanoDrive™ Reduced Swing

• Vdd = 1.8V

• Idd Core = 900nA (typ)

Supply Current = 900nA + (65nA/V)(0.5V) = 932nA

Total Supply Current with Load

To calculate the total supply current, including the load,

follow the equation listed below. Note the 30% reduction in

power with NanoDrive™.

+ Load Current (C*V*F