Datasheet
SLAS361D − JANUARY 2002 − REVISED AUGUST 2004
24
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (continued)
main DCO characteristics
D Individual devices have a minimum and maximum operation frequency. The specified parameters for
f
(
DCOx0)
to f
(
DCOx7)
are valid for all devices.
D All ranges selected by Rsel(n) overlap with Rsel(n+1): Rsel0 overlaps Rsel1, ... Rsel6 overlaps Rsel7.
D DCO control bits DCO0, DCO1, and DCO2 have a step size as defined by parameter S
DCO
.
D Modulation control bits MOD0 to MOD4 select how often f
(
DCO+1)
is used within the period of 32 DCOCLK
cycles. The frequency f
(DCO)
is used for the remaining cycles. The frequency is an average equal to:
f
average
+
32 f
(DCO)
f
(DCO)1)
MOD f
(DCO)
)(32*MOD) f
(DCO)1)
DCO when using R
OSC
(see Note 1)
PARAMETER TEST CONDITIONS V
CC
MIN NOM MAX UNIT
R
sel
= 4, DCO = 3, MOD = 0, DCOR = 1,
2.2 V 1.8±15% MHz
f
DCO
, DCO output frequency
R
sel
= 4, DCO = 3, MOD = 0, DCOR = 1,
T
A
= 25°C
3 V 1.95±15% MHz
D
t
, Temperature drift R
sel
= 4, DCO = 3, MOD = 0, DCOR = 1 2.2 V/3 V ±0.1 %/°C
D
v
, Drift with V
CC
variation R
sel
= 4, DCO = 3, MOD = 0, DCOR = 1 2.2 V/3 V 10 %/V
NOTES: 1. R
OSC
= 100kΩ. Metal film resistor, type 0257. 0.6 watt with 1% tolerance and T
K
= ±50ppm/°C.
crystal oscillator,LFXT1
PARAMETER TEST CONDITIONS V
CC
MIN TYP MAX UNIT
Pin load
XTS=0; LF mode selected
2.2 V / 3 V
12
C
XIN
Pin load
capacitance
XTS=1; XT1 mode selected (see Note 1)
2.2 V / 3 V
2
pF
Pin load
XTS=0; LF mode selected 2.2 V / 3 V 12
C
XOUT
Pin load
capacitance
XTS=1; XT1 mode selected (see Note 1) 2.2 V / 3 V 2
pF
V
IL
V
SS
0.2 × V
CC
V
V
IH
Input levels at XIN see Note 2 2.2 V / 3 V
0.8 × V
CC
V
CC
V
NOTES: 1. Requires external capacitors at both terminals. Values are specified by crystal manufacturers.
2. Applies only when using an external logic-level clock source. Not applicable when using a crystal or resonator.