ICS557-05A
QUAD DIFFERENTIAL PCI-EXPRESS GEN1 CLOCK SOURCE PCIE SSCG
IDT®
QUAD DIFFERENTIAL PCI-EXPRESS GEN1 CLOCK SOURCE 10
ICS557-05A REV O 112111
AC Electrical Characteristics - CLKOUT, LVDS
Unless stated otherwise, VDD=3.3 V ±5%, Ambient Temperature -40 to +85° C
1
Test setup is R
L
=50 ohms with 2 pF, Rr = 475Ω (1%).
2
Measurement taken from a single-ended waveform.
3
Measurement taken from a differential waveform.
4
Measured at the crossing point where instantaneous voltages of both CLKOUT and CLKOUT are equal.
5
CLKOUT pins are tri-stated when OE is asserted low. CLKOUT is driven differential when OE is high unless its PD= low.
Thermal Characteristics
Parameter Symbol Conditions Min. Typ. Max. Units
Input Frequency 25 MHz
Output Frequency LVDS termination 100 MHz
Differential Output Voltage V
OD
247 454 mV
Offset Voltage V
OS
1.125 1.375 V
∆V
OD
|Change to V
OD
|
50 mV
∆V
OS
|Change to V
OS
|
50 mV
Jitter, Cycle-to-Cycle
1,3
80 ps
Modulation Frequency Spread spectrum 30 31.5 33 kHz
Slew Rate, Rise
1,3
t
SLR
Measured from ±150 mV from
crossing point voltage
14V/ns
Slew Rate, Fall
1,3
t
SLF
Measured from ±150 mV from
crossing point voltage
14V/ns
Skew between outputs At crossing point Voltage 50 ps
Duty Cycle
1,3
45 55 %
Output Enable Time
5
All outputs 10 µs
Output Disable Time
5
All outputs 10 µs
Power-up Time t
STABLE
From power-up VDD=3.3 V 3 ms
Spread Change Time t
SPREAD
Settling period after spread change 3 ms
Parameter Symbol Conditions Min. Typ. Max. Units
Thermal Resistance Junction to
Ambient
θ
JA
Still air 93 ° C/W
θ
JA
1 m/s air flow 78 ° C/W
θ
JA
3 m/s air flow 65 ° C/W
Thermal Resistance Junction to Case θ
JC
20 ° C/W
