SM5847 View Datasheet(PDF) - Nippon Precision Circuits
Part Name
Description
Manufacturer
SM5847 Datasheet PDF : 30 Pages
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SM5847AF
AC Electrical Characteristics
Crystal oscillator (XTI, XTO)
VDD = VDDAC = 3.00 to 5.25 V, VSS = VSSAC = 0 V, Ta = −40 to 85 °C
Parameter
Symbol
Condition
Rating
Unit
min
typ
max
Oscillator frequency1
fO S C
–
–
50
MHz
1. External circuit components should be matched for the crystal oscillator element used.
External clock input (XTI)
VDD = VDDAC = 3.00 to 5.25 V, VSS = VSSAC = 0 V, Ta = −40 to 85 °C
Parameter
Master clock frequency
Master clock duty
Symbol
fX T I
Condition
1/2VDD thresholds
Rating
Unit
min
typ
max
–
–
60
MHz
40
–
60
%
Internal system clock
The crystal oscillator frequency or external clock input master clock frequency ratings are described in the pre-
ceding tables, but it is the internal system clock frequency rating, set by the internal frequency divider
(CKDV1, CKDV2), that must be satisfied. The master clock frequency is a multiple of the sampling frequency
fs.
CKDV1 = CKDV2 = LOW (internal system clock frequency = XTI input frequency),
VSS = VSSAC = 0 V, Ta = −40 to 85 °C
Parameter
Symbol
Condition
Rating
Unit
min
typ
max
256fs (CKSLN = LOW , CKDV1 = LOW , CKDV2 = LOW)
System clock frequency
VDD = VDDAC = 4.50 to 5.25 V
0.256
–
fS Y S 1
VDD = VDDAC = 3.00 to 5.25 V
0.256
–
192fs (CKSLN = HIGH, CKDV1 = LOW , CKDV2 = LOW)
27.6
MHz
25
System clock frequency
fS Y S 2
V DD = V DDAC = 4.75 to 5.25 V,
Ta = −40 to 70 °C
0.384
–
VDD = VDDAC = 3.00 to 5.25 V
0.384
–
37
MHz
20.7
NIPPON PRECISION CIRCUITS—7
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