Avago Technologies LSI53C1000R - Manual (Page 293)

AC Characteristics 6-11
Version 2.2 Copyright © 2000–2003 by LSI Logic Corporation. All rights reserved.
6.3 AC Characteristics
The AC characteristics described in this section apply over the entire
range of operating conditions (refer to
Section 6.1, “DC Characteristics” ).
Chip timing is based on simulation at worst case voltage, temperature,
and processing. Timing was developed with a load capacitance of 50 pF.
Table 6.14 and Figure 6.8 provide external clock timing data.
.
Figure 6.8 External Clock
Table 6.14 External Clock
Symbol Parameter
66 MHz PCI 33 MHz PCI
1
1. The minimum PCI Clock frequency is 33 MHz.
Unit Min Max Min Max
t
1
PCI Bus clock period 15 30 30 30 ns
SCSI clock period 25 25 25 25 ns
t
2
PCI CLK LOW time
2
2. Duty cycle not to exceed 60/40.
6 – 11 – ns
SCLK LOW time 10 15 10 15 ns
t
3
PCI CLK HIGH time 6 – 11 – ns
SCLK HIGH time 10 15 10 15 ns
t
4
PCI CLK slew rate 1.5 4 1 4 V/ns
CLK, SCLK 1.4 V
t
1
t
3
t
4
t
2