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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 –24.6MHz
– High Period 20.6
– 5300 ns
– Low Period 20.6
– –ns
– Power Up IMO to Switch 150
– – μs
Note
20.100 ns minimum input pulse width is based on the input synchronizers running at 12 MHz (84 ns nominal period).
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