Lucent Technologies USS-720 Timing Characteristics, Preliminary Data Sheet, Rev, Instant USB

Preliminary Data Sheet, Rev. 5	USS-720	Instant USB
September 1999	USB-to-IEEE	1284 Bridge

Timing Characteristics

■Timing is specified over the operating range from 0 °C to 70 °C ambient temperature, VDD = 3.0 V to 3.6 V, and VDD5 = 4.75 V to 5.25 V.

■All timing is referenced from the rising edge of CLK_LO, with 70 pF output load.

■Only DIO is required to meet these input setup and hold times for proper operation. For other inputs, meeting the limit is only required to ensure that the signal will be recognized on the referenced clock edge rather than one period later.

Table 34. Setup and Hold Input Timing
Parameter	Setup Time		Hold Time		Unit
DIO Setup and Hold	2.9		3.4		ns
Table 35. Clock Characteristics/Miscellaneous Input Timing
Parameter		Symbol		Min	Typical	Max	Unit
Frequency of Operation (CLK_LO)		f		11.976	12.000	12.024	MHz
Clock Period		tcyc		83.1	83.3	83.5	ns
Duty Cycle		—		—	40/60*	—	%

* The duty cycle applies to any frequency in the specified range.

Table 36. Output Delay Timing

Parameter	Min	Max	Unit
PDATA Output Delay	5.3	21.5	ns
NUSB_RESET Output Delay	6.5	17.1	ns
SUSPEND Output Delay	2.6	34.6	ns
SK Output Delay	6.4	16.0	ns
CS Output Delay	—	75.0	ns
DIO Output Delay	3.6	31.6	ns

Table 37. Miscellaneous Output Timing

Parameter	Symbol	Min	Typical	Max	Unit
Frequency of Operation (SK)	f	390	429	476	kHz
Clock Period	tcyc	2.10	2.33	2.56	μs
Duty Cycle	—	—	50/50*	—	%

* The duty cycle applies to any frequency in the specified range.

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