str712 STMicroelectronics, str712 Datasheet - Page 41

• Manufacturer Part Number: str712
• Description: 144/64-pin Arm7tdmi Mcu With Up To 256kb Flash, 64kb Ram And Emi
• Manufacturer: STMicroelectronics

STR71xF
4.3.2
Clock and timing characteristics
External clock sources
Subject to general operating conditions for V
Table 18.
Notes:
1. Data based on design simulation and/or technology characteristics, not tested in production.
Figure 14. CK external clock source
DuCy(XT1)
Symbol
C
t
t
V
V
t
t
w(CK)
w(CK)
IN(CK)
r(CK)
f(CK)
f
CKH
CK
CKL
I
L
V
V
CKH
CKL
External clock source
frequency
CK input pin high level
voltage
CK input pin low level
voltage
CK high or low time
CK rise or fall time
CK input capacitance
Duty cycle
CK Input leakage current
EXTERNAL
CLOCK SOURCE
CK external clock characteristics
Parameter
t
r(CK)
T
CK
1)
1)
1)
t
f(CK)
CK
90%
10%
V
SS
Conditions
≤V
IN
33
≤V
t
w(CKH)
, and T
33
A
I
L
.
0.7xV
t
w(CKL)
Min
V
25
40
0
SS
33
f
CLK
STR710
Typ
5
Electrical parameters
0.3xV
Max
16.5
V
20
60
±1
33
33
MHz
Unit
41/78
µA
pF
ns
%
V