CDC950 Datasheet, PDF (7/16 Pages) Texas Instruments – 133-MHz DIFFERENTIAL CLOCK SYNTHESIZER/DRIVER FOR PC MOTHERBOARDS/SERVERS

CDC950
133ĆMHz DIFFERENTIAL CLOCK SYNTHESIZER/DRIVER FOR
PC MOTHERBOARDS/SERVERS
SCAS646B − FEBRUARY 2001 − REVISED OCTOBER 2003
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
MIN TYP† MAX UNIT
VIK
Input clamp voltage
VDD = 3.135 V, II = –18 mA
High-level input All inputs except
IIH
current
SelA, SelB
VDD = 3.465 V, VI = VDD
−1.2 V
5 µA
IIL
Low-level input All inputs except
current
SelA, SelB
VDD = 3.465 V, VI = GND
−5 µA
IOZ
High-impedance
-state output
current
All outputs including
SelA, SelB
VDD = 3.465 V
3V48/SelA, 3V48/SelB = H,
SEL100/133 = L,
VO = VDD or GND,
PWRDWN = H
±10 µA
IDD(Z)
High-impedance-state supply current‡ VDD = 3.465 V
3V48/SelA, 3V48/SelB = H,
SEL100/133 = L,
PWRDWN = H
19
25 mA
IDD(PD)
AIDD(PD)
PWRDWN state supply current‡
SelA, SelB = L
R(ref) = 475 Ω
PWRDWN = L
VDD Supply
AVDD Supply
43
47 mA
3.4 4.2 mA
IDD(D)
Dynamic supply current‡
VDD = 3.465 V,
Rref = 475 Ω,
IO = 6 x Iref
PWRDWN = H
SSC = ON/OFF
CL = MAX
100 MHz
133 MHz
100 MHz and SSC off
173 190
mA
183 200
19
24
133 MHz and SSC off
26
AlDD
Analog power supply current
VDD = 3.465 V _{100 MHz and SSC on}
26
33
mA
33
133 MHz and SSC on
35
CI
Input capacitance§
VDD = 3.3 V,
VI = VDD or GND
2
C(XTAL) Crystal load capacitance^W
Effective capacity between CIN and COUT
13.5
† _{All typical values are measured at their respective nominal VDD values.}
‡ _{CL = MAX = 5 pF, RS = 33.2 Ω, Rp = 49.9 Ω at HCLK/HCLK (Type X1)}
CL = MAX = 20 pF, RL = 500 Ω at 48 MHz, REF (Type 3)
CL = MAX = 30 pF, RL = 500 Ω at CLK33 (Type 5)
§ _{These parameters are assured by design and lab characterization, not 100% production tested.}
¶ _{This is the corresponding capacitive load for the XTAL in this oscillator application (Pierce oscillator)}
45
5
pF
22.5
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