February 9, 2000

5

MICRF004/RF044

MICRF004/RF044

Micrel

Symbol

Parameter

Condition

Min

Typ

Max

Units

Digital/Control Section

I

IN(pu)

Input Pull up Current

SEL0, SEL1, SWEN, V

8

µA

V

IN(high)

Input High Voltage

SEL0, SEL1, SWEN

0.8V

DD

V

V

IN(low)

Input Low Voltage

SEL0, SEL1, SWEN

0.2V

DD

V

I

OUT

Output Current

DO, WAKEB pins, push-pull

10

µA

V

OUT(high)

Output High Voltage

DO, WAKEB pins, I

0.9V

DD

V

V

OUT(low)

Output Low Voltage

DO, WAKEB pins, I

0.1V

DD

V

t

Output Rise and Fall Times

DO, WAKEB pins, C

10

µs

t

WAKEB

Wakeup Output Time

RF

4

ms

V

Note 1.

Exceeding the absolute maximum rating may damage the device.

Note 2.

The device is not guaranteed to function outside its operating rating.

Note 3.

Devices are ESD sensitive. Use appropriate ESD precautions. Meets class 1 ESD test requirements, (human body model HBM), in accor-

dance with MIL-STD-883C, method 3015. Do not operate or store near strong electrostatic fields.

Note 4:

defined as a return-to-zero (RZ) waveform with 50% average duty cycle (Manchester encoded data) at a data rate of 300b/s. The RF input is

assumed to be matched into 50

Ω.

Note 5:

Spurious reverse isolation represents the spurious components which appear on the RF input pin (ANT) measured into 50

Ω with an input RF

matching network.

Note 6:

Sensitivity, a commonly specified receiver parameter, provides an indication of the receiver’s input referred noise, generally input thermal

noise. However, it is possible for a more sensitive receiver to exhibit range performance no better than that of a less sensitive receiver if the

background noise is appreciably higher than the thermal noise. Background noise refers to other interfering signals, such as FM radio

stations, pagers, etc.

A better indicator of achievable receiver range performance is usually given by its selectivity, often stated as fntermediate frequency (IF) or

radio frequency (RF) bandwidth, depending on receiver topology. Selectivity is a measure of the rejection by the receiver of “ether” noise.

More selective receivers will almost invariably provide better range. Only when the receiver selectivity is so high that most of the noise on the

receiver input is actually thermal will the receiver demonstrate sensitivity-limited performance.

Note 7:

Parameter scales linearly with reference oscillator frequency f

parameter value as the ratio:

f

MHz

4.65

(parameter value at 4.65MHz)

REFOSC

×

Example: For reference oscillator freqency f

(parameter value at 6.00MHz)

6.00

4.65

(paramter value at 4.65MHz)

=×

Note 8:

Parameter scales inversely with reference oscillator frequency f

parameter value as the ratio:

4.65

f

MHz

(parmeter value at 4.65MHz)

REFOSC

×

Example: For reference oscillator frequency f

(parmeter value at 4.65MHz)

4.65

6.00

(parmeter value at 4.65MHz)

=×

Note 9:

Demodulator filter bandwidths are related in a binary manner, so any of the (lower) nominal filter values may be derived simply by dividing this

parameter value by 2, 4, or 8 as desired.

Note 10: External signal generator used. When a crystal or ceramic resonator is used, the minimum voltage is 300mVp-p. The reference oscillator

voltage amplitude is a function of the quality of the ceramic or crystal resonator.