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Preliminary Data Sheet, Rev. 5 USS-720
Instant USB
September 1999 USB-to-
IEEE
1284 Bridge
Lucent Technologies Inc. 5-27
13
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.
—%