Avago Technologies LSI53C180 - Manual (Page 51)

Electrical Characteristics 3-17
3.2.3 AC Characteristics
The AC characteristics described in this section apply over the entire
range of operating conditions (refer to DC Characteristics in this chapter).
Chip timing is based on simulation at worst case voltage, temperature,
and processing. The LSI53C180 requires a 40 MHz clock input.
Figure 3.12 Clock Timing
3.2.4 SCSI Interface Timing
Table 3.16 Clock Timing
Symbol Parameter Min Max Units
t
1
Clock period 24.75 25.25 ns
t
2
Clock low time 10 15 ns
t
3
Clock high time 10 15 ns
t
4
Clock rise time 1 – V/ns
Clock
t
1
t
3
t
4
t
2
Table 3.17 Input Timing - Single Transition
Symbol Parameter Min Max Units
t
ST1
Input data setup 4.5 – ns
t
ST2
Input data hold 4.5 – ns
t
ST3
Input REQ/ACK assertion pulse width 6.5 – ns
t
ST4
Input REQ/ACK deassertion pulse width 6.5 – ns