DSP56F807 Motorola Inc, DSP56F807 Datasheet - Page 26

• Manufacturer Part Number: DSP56F807
• Description: 56F807 16-bit Hybrid Processor
• Manufacturer: Motorola Inc

3.5.3
The recommended method of connecting an external clock is given in
source is connected to XTAL and the EXTAL pin is grounded.
Operating Conditions:
26
Frequency of operation (external clock driver)
Clock Pulse Width
External
Note: The midpoint is V
1.
2.
3.
Clock
Note: Motorola recommends only two terminal ceramic resonators vs. three terminal
resonators (which contain an internal bypass capacitor to ground).
See
The high or low pulse width must be no smaller than 6.25ns or the chip will not function.
Parameters listed are guaranteed by design.
External Clock Source
Figure 11
Table 27. External Clock Operation Timing Requirements
Characteristic
2
10%
50%
90%
,
3
for details on using the recommended connection of an external clock driver.
Figure 11. Connecting an External Clock Signal
V
t
PW
SS
Figure 10. Connecting a Ceramic Resonator
IL
= V
+ (V
Freescale Semiconductor, Inc.
EXTAL XTAL
SSA
For More Information On This Product,
IH
Figure 12. External Clock Timing
= 0 V, V
– V
R
f
c
IL
z
)/2.
Go to: www.freescale.com
DD
t
= V
PW
1
External
XTAL
Clock
Recommended Ceramic Resonator
Parameters:
R
f
DDA
c
z
= 8MHz (optimized for 8MHz)
= 1 to 3 M
56F807
Symbol
= 3.0–3.6 V, T
f
t
osc
PW
EXTAL
V
SS
A
6.25
Min
= –40 to +85 C
0
Figure
Typ
—
—
11. The external clock
56F807 Technical Data
Max
80
—
5
10%
50%
90%
V
V
MHz
Unit
IH
IL
ns