89hpes12t3bg2 Integrated Device Technology, 89hpes12t3bg2 Datasheet - Page 11

• Manufacturer Part Number: 89hpes12t3bg2
• Description: 12-lane 3-port Gen2 Pci Express Switch
• Manufacturer: Integrated Device Technology

System Clock Parameters
AC Timing Characteristics
© 2009 Integrated Device Technology, Inc
Values based on systems running at recommended supply voltages and operating temperatures, as shown in Tables 13 and 14.
Refclk
T
T
V
V
V
V
V
T
T
T
T
V
V
Duty Cycle
Rise/Fall Matching
Z
IDT 89HPES12T3BG2 Data Sheet
1.
C-RISE
C-FALL
STABLE
PERIOD-AVG
PERIOD-ABS
CC-JITTER
C-DC
IH
IL
CROSS
CROSS-DELTA
RB
MAX
MIN
PCIe Transmit
UI
T
T
MAX-JITTER
T
T
Parameter
The input clock frequency will be either 100 or 125 MHz depending on signal REFCLKM.
TX-EYE
TX-EYE-MEDIAN-to-
TX-RISE
TX- IDLE-MIN
Parameter
FREQ
, T
TX-FALL
Input reference clock frequency range
Rising edge rate
Falling edge rate
Differential input high voltage
Differential input low voltage
Absolute single-ended crossing point
voltage
Variation of V
edges
Ring back voltage margin
Time before V
Average clock period accuracy
Absolute period, including spread-spec-
trum and jitter
Cycle to cycle jitter
Absolute maximum input voltage
Absolute minimum input voltage
Duty cycle
Single ended rising Refclk edge rate ver-
sus falling Refclk edge rate
Clock source output DC impedance
Unit Interval
Minimum Tx Eye Width
Maximum time between the jitter median and maximum
deviation from the median
TX Rise/Fall Time: 20% - 80%
Minimum time in idle
Description
CROSS
RB
is allowed
Description
over all rising clock
*Notice: The information in this document is subject to change without notice
Table 10 PCIe AC Timing Characteristics (Part 1 of 2)
Table 9 Input Clock Requirements
Condition
Single-ended
Single-ended
Differential
Differential
Differential
Differential
Differential
Differential
11 of 30
Min
399.88
0.125
0.75
20
1
Gen 1
Typ
400
9.847
Min
+150
+250
-100
-300
1
100
500
-0.3
0.6
0.6
40
40
Max
400.12
0.125
1
Typical
199.94
Min
0.75
0.15
20
20
1
Gen 2
Typ
200
1
10.203
Max
+1.15
+550
+140
+100
2800
125
-150
150
60
60
4
4
Max
200.06
1
1
Units
July 1, 2009
Unit
MHz
V/ns
V/ns
ps
ppm
UI
UI
UI
UI
mV
mV
mV
mV
mV
ps
ns
ps
%
%
Ω
V
V