CY8C21634, CY8C21534
CY8C21434, CY8C21334, CY8C21234
Document Number: 38-12025 Rev. *O
Page 30 of 45
AC External Clock Specifications
The following tables list the guaranteed maximum and minimum specifications for the voltage and temperature ranges: 4.75V to 5.25V
and -40
°
C
≤
T
A
≤
85
°
C, or 3.0V to 3.6V and -40
°
C
≤
T
A
≤
85
°
C, respectively. Typical parameters apply to 5V, 3.3V, or 2.7V at 25
°
C
and are for design guidance only.
Table 33. 2.7V AC Digital Block Specifications
Function
Description
Min
Typ
Max
Units
Notes
All
Functions
Maximum Block Clocking Frequency
12.7
MHz
2.4V < Vdd < 3.0V.
Timer
Capture Pulse Width
100
[20]
–
–
ns
Maximum Frequency, With or Without Capture
–
–
12.7
MHz
Counter
Enable Pulse Width
100
–
–
ns
Maximum Frequency, No Enable Input
–
–
12.7
MHz
Maximum Frequency, Enable Input
–
–
12.7
MHz
Dead Band Kill Pulse Width:
Asynchronous Restart Mode
20
–
–
ns
Synchronous Restart Mode
100
–
–
ns
Disable Mode
100
–
–
ns
Maximum Frequency
–
–
12.7
MHz
CRCPRS
(PRS
Mode)
Maximum Input Clock Frequency
–
–
12.7
MHz
CRCPRS
(CRC
Mode)
Maximum Input Clock Frequency
–
–
12.7
MHz
SPIM
Maximum Input Clock Frequency
–
–
6.35
MHz
Maximum data rate at 3.17 MHz
due to 2 x over clocking.
SPIS
Maximum Input Clock Frequency
–
–
4.1
MHz
Width of SS_ Negated Between Transmissions
100
–
–
ns
Transmitter Maximum Input Clock Frequency
–
–
12.7
MHz
Maximum data rate at 1.59 MHz
due to 8 x over clocking.
Receiver
Maximum Input Clock Frequency
–
–
12.7
MHz
Maximum data rate at 1.59 MHz
due to 8 x over clocking.
Table 34. 5V AC External Clock Specifications
Symbol
Description
Min
Typ
Max
Units
F
OSCEXT
Frequency
0.093
–
24.6
MHz
–
High Period
20.6
–
5300
ns
–
Low Period
20.6
–
–
ns
–
Power Up IMO to Switch
150
–
–
μ
s
Note
20. 100 ns minimum input pulse width is based on the input synchronizers running at 12 MHz (84 ns nominal period).
[+] Feedback
