Cypress CY8C21334, CY8C21634, CY8C21234, CY8C21434, CY8C21534 manual AC External Clock Specifications

CY8C21634, CY8C21534

CY8C21434, CY8C21334, CY8C21234

Table 33. 2.7V AC Digital Block Specifications

Function	Description	Min	Typ	Max	Units	Notes
All	Maximum Block Clocking Frequency			12.7	MHz	2.4V < Vdd < 3.0V.
Functions
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	Maximum Input Clock Frequency	–	–	12.7	MHz
(PRS
Mode)
CRCPRS	Maximum Input Clock Frequency	–	–	12.7	MHz
(CRC
Mode)
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.

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 ≤ TA ≤ 85°C, or 3.0V to 3.6V and -40°C ≤ TA ≤ 85°C, respectively. Typical parameters apply to 5V, 3.3V, or 2.7V at 25°C and are for design guidance only.

Table 34. 5V AC External Clock Specifications

Symbol	Description	Min	Typ	Max	Units
FOSCEXT	Frequency	0.093	–	24.6	MHz
–	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).

Document Number: 38-12025 Rev. *O Page 30 of 45

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