Datasheet

Electrical Specifications
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
372 Freescale Semiconductor
28.1.8 CGM Operating Conditions
28.1.9 CGM Component Information
Characteristic Symbol Min Typ Max Unit Comments
Operating Voltage
V
DDA
V
DD
–0.3
—
V
DD
+0.3
V
V
SSA
V
SS
–0.3
—
V
SS
+0.3
V
Crystal Reference Frequency
f
CGMRCLK
14.91528MHz
Module Crystal Reference Frequency
f
CGMXCLK
—4.9152—MHz
Same Frequency
as f
CGMRCLK
Range Nom. Multiplier
f
NOM
—4.9152—MHz
VCO Center-of-Range Frequency
f
CGMVRS
4.9152 —
Note
(1)
1. f
CGMVRS
is a nominal value described and calculated as an example in Chapter 10 Clock Generator Module (CGM) for the desired VCO
operating frequency, f
CGMVCLK
.
MHz
VCO Operating Frequency
f
CGMVCLK
4.9152 — 32.0
Description Symbol Min Typ Max Unit Comments
Crystal Load Capacitance
C
L
————
Consult Crystal
Manufacturer’s Data
Crystal Fixed Capacitance C1 — 2 x CL — —
Consult Crystal
Manufacturer’s Data
Crystal Tuning Capacitance C2 — 2 x CL — —
Consult Crystal
Manufacturer’s Data
Filter Capacitor Multiply Factor
C
fact
— 0.0154 — F/s V
Filter Capacitor
C
F
—
C
FACT
x
(V
DDA
/f
XCLK
)
——
See 10.4.3 External Filter
Capacitor Pin (CGMXFC)
Bypass Capacitor
C
BYP
—0.1—μF
CBYP must provide low AC
impedance from
f = f
CGMXCLK
/100 to 100 x
f
CGMVCLK
, so series
resistance must be
considered.