SH3003 Datasheet, PDF (4/30 Pages) Semtech Corporation – MicroBuddy® Support IC for Microcontrollers

SH3003
POWER MANAGEMENT
Electrical Characteristics (continued)
Crystal Oscillator
Not authorized for release outside of Semtech - DRAFT
Parameter
Symbol
Min
Crystal operating frequency
CLK32 duty cycle
F_OP
DC
25
Start-up time
XIN/XOUT padding capacitance after power-up
Minimum X_IN/X_OUT padding capacitance
Maximum X_IN/X_OUT padding capacitance
Padding capacitance resolution
X_IN switching threshold
X_IN to CLK32 delay
CLK32 frequency stability (crystal-dependent)
CLK32 cycle-to-cycle jitter
T_ST
C_PUP
C_MIN
C_MAX
C_RES
V_TH
T_D
F_S
J
CLK32 rise/fall time (10pF load)
T_RF
CLK32 logic output low (0.5mA load)
V_OL
CLK32 logic output high (0.5mA load)
V_OH
-0.5
*Note: VDD here is VDD during normal operation and VBAK during battery backup.
Typ
32.768
12.5
10
40
2
0.6
0.5
1
0.05
10
0.25
-0.25
Max
Units
kHz
75
%
3
secs
pF
pF
pF
pF
V
ppm/°C
μs
%
ns
0.5
V
Ref VDD*
32.768kHz RC Oscillator
Parameter
Symbol
Min
Typ
Max
Units
External 1MΩ referenced nominal frequency
Internal 1MΩ referenced nominal frequency
CLK32 duty cycle*
F_EXT
32.768
kHZ
F_INT
32.768
kHZ
DC
40
60
%
Programmed frequency accuracy at 25°C
F_ST
-1
+1
Absolute accuracy (temp. & supply external 1MΩ)
F_DE
±2
Absolute accuracy (temp. & supply internal 1MΩ)
F_DI
±3
Frequency temperature stability (ext. 1MΩ)
F_SE
100
Frequency temperature stability (int. 1MΩ)
F_SI
200
Power on start-up time
T_ST
70
CLK32 cycle-to-cycle jitter*
J
0.1
*Note: After power-up, pin CLK32 is disabled, pin RREF is also disabled, and the oscillator is set to operate without the
external reference resistor.
%
%
%
ppm/°C
ppm/°C
μs
%
©2006 Semtech Corp.
4
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