SH3000 Datasheet, PDF (16/24 Pages) Semtech Corporation – Low-Power Programmable Multifunction Support IC for Microcontrollers

SH3000 MicroBuddy™
SYSTEM MANAGEMENT
Operating characteristics with crystal oscillator
Parameter
Crystal operating frequency
CLK32 duty cycle
Startup time
Minimum XIN/XOUT padding capacitance
Maximum XIN/XOUT padding capacitance
Padding capacitance resolution
XIN switching threshold
XIN to CLK32 delay
CLK32 frequency stability (crystal-dependent)
CLK32 cycle to cycle jitter
CLK32 rise/fall time (10 pF load)
CLK32 logic output low (0.5 mA load)
CLK32 logic output high (0.5 mA load)
Symbol Min
Fop
DC
25
Tst
Cmin
9
Cmax
36
Cres
1.8
Vth
Td
Fs
J
Trf
Vol
Voh
-0.5
Typ
Max
32.768
75
3
10
11
40
44
2
2.2
0.6
1
1
0.1
20
0.25
0.5
-0.25
*Note: VDD here is VDD during normal operation and VBAK during battery backup.
Units
kHz
%
secs
pF
pF
pF
V
µs
ppm/°C
ns
V
Ref VDD*
Operating characteristics of 32 kHz RC oscillator
Parameter
External 1 MOhm referenced nominal frequency
Internal 1 MOhm referenced nominal frequency
CLK32 duty cycle
Programmed frequency accuracy at 25°C
Absolute accuracy over temperature and supply
(external 1 MOhm)
Absolute accuracy over temperature and supply
(internal 1 MOhm)
Frequency temperature stability (ext. 1 MOhm)
Frequency temperature stability (int. 1 MOhm)
Power on startup time
CLK32 cycle to cycle jitter
Symbol Min
Fext
Fint
DC
40
Fst
-1
Fde
-2
Fdi
-3
Fse
Fsi
Tst
J
Typ
Max
32.768
32.768
60
+1
+2
+3
100
200
100
0.2
Units
kHz
kHz
%
%
%
%
ppm/°C
ppm/°C
µs
%
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