Datasheet

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SLAS272F − JULY 2000 − REVISED JUNE 2004
33
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended 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 fDCOx7 are valid for all devices.
D All ranges selected by Rsel(n) overlap with Rsel(n+1): Rsel0 overlaps with Rsel1, ... Rsel6 overlaps with
Rsel7.
D DCO control bits DCO0, DCO1, and DCO2 have a step size as defined by parameter SDCO.
D Modulation control bits MOD0 to MOD4 select how often fDCO+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(DCO) × (2
MOD/32
).
DCO when using R
OSC
(see Note 1)
PARAMETER TEST CONDITIONS V
CC
MIN NOM MAX UNIT
f
DCO
, DCO output frequency
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 oscillator (see Note 1)
PARAMETER TEST CONDITIONS MIN NOM MAX UNIT
C
XIN
Integrated input capacitance
XTS=0; LF oscillator selected
V
CC
= 2.2 V/3 V
12
pF
C
XIN
Integrated input capacitance
XTS=1; XT1 oscillator selected
V
CC
= 2.2 V/3 V
2
pF
C
XOUT
Integrated output capacitance
XTS=0; LF oscillator selected
V
CC
= 2.2 V/3 V
12
pF
C
XOUT
Integrated output capacitance
XTS=1; XT1 oscillator selected
V
CC
= 2.2 V/3 V
2
pF
V
IL
Input levels at XIN
V
CC
= 2.2 V/3 V (see Note 2)
V
SS
0.2 × V
CC
V
V
IH
Input levels at XIN
V
CC
= 2.2 V/3 V (see Note 2)
0.8 × V
CC
V
CC
V
NOTES: 1. The oscillator needs capacitors at both terminals, with values specified by the crystal manufacturer.
2. Applies only when using an external logic-level clock source. Not applicable when using a crystal or resonator.
crystal oscillator, XT2 oscillator (see Note 1)
PARAMETER TEST CONDITIONS MIN NOM MAX UNIT
C
XT2IN
Input capacitance V
CC
= 2.2 V/3 V 2 pF
C
XT2OUT
Output capacitance V
CC
= 2.2 V/3 V 2 pF
V
IL
Input levels at XT2IN
V
CC
= 2.2 V/3 V (see Note 2)
V
SS
0.2 × V
CC
V
V
IH
Input levels at XT2IN
V
CC
= 2.2 V/3 V (see Note 2)
0.8 × V
CC
V
CC
V
NOTES: 1. The oscillator needs capacitors at both terminals, with values specified by the crystal manufacturer.
2. Applies only when using an external logic-level clock source. Not applicable when using a crystal or resonator.
USART0, USART1 (see Note 1)
PARAMETER TEST CONDITIONS MIN NOM MAX UNIT
t
( )
USART0/1: deglitch time
V
CC
= 2.2 V 200 430 800
ns
t
(τ)
USART0/1: deglitch time
V
CC
= 3 V 150 280 500
ns
NOTE 1: The signal applied to the USART0/1 receive signal/terminal (URXD0/1) should meet the timing requirements of t
(τ)
to ensure that the
URXS flip-flop is set. The URXS flip-flop is set with negative pulses meeting the minimum-timing condition of t
(τ)
. The operating
conditions to set the flag must be met independently from this timing constraint. The deglitch circuitry is active only on negative
transitions on the URXD0/1 line.