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CDCEL949 Datasheet(PDF) 5 Page - Texas Instruments

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Part # CDCEL949
Description  Programmable 4-PLL VCXO Clock Synthesizer with 1.8V, 2.5V and 3.3V LVCMOS Outputs
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

CDCEL949 Datasheet(HTML) 5 Page - Texas Instruments

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TIMING REQUIREMENTS
DEVICE CHARACTERISTICS
CDCE949
CDCEL949
SCAS844 – JUNE 2007
over recommended ranges of supply voltage, load and operating free-air temperature
CLK_IN Requirements
MIN
NOM
MAX
UNIT
PLL Bypass Mode
0
160
f(CLK)
LVCMOS clock input frequency
MHz
PLL Mode
8
160
tr / tf
Rise and fall time CLK signal (20% to 80%)
3
ns
dutyCLK
Duty cycle CLK at VDD / 2
40%
60%
STANDARD
FAST
MODE
MODE
SDA/SCL TIMING REQUIREMENTS (see Figure 12)
UNIT
MIN
MAX
MIN
MAX
f(SCL)
SCL clock frequency
0
100
0
400
kHz
tsu(START)
START setup time (SCL high before SDA low)
4.7
0.6
μs
th(START)
START hold time (SCL low after SDA low)
4
0.6
μs
tw(SCLL)
SCL low-pulse duration
4.7
1.3
μs
tw(SCLH)
SCL high-pulse duration
4
0.6
μs
th(SDA)
SDA hold time (SDA valid after SCL low)
0
3.45
0
0.9
μs
tsu(SDA)
SDA setup time
250
100
ns
tr
SCL/SDA input rise time
1000
300
ns
tf
SCL/SDA input fall time
300
300
ns
tsu(STOP)
STOP setup time
4.0
0.6
μs
tBUF
Bus free time between a STOP and START condition
4.7
1.3
μs
over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN TYP(1)
MAX
UNIT
OVERALL PARAMETER
All PLLs on
38
All outputs off, fCLK = 27
IDD
Supply current (see Figure 3)
mA
MHz, fVCO= 135 MHz;
Per PLL
9
CDCE949
4
VDDOUT=3.3 V
Supply current (see Figure 4 and
No load, all outputs on,
IDD(OUT)
mA
Figure 5)
fout = 27 MHz
CDCEL949
2
VDDOUT=1.8 V
Power down current. Every circuit
IDD(PD)
fIN = 0 MHz, VDD = 1.9 V
50
μA
powered down except SDA/SCL
Supply voltage Vdd threshold for power
V(PUC)
0.85
1.45
V
up control circuit
fVCO
VCO frequency range of PLL
80
230
MHz
fOUT
LVCMOS output frequency
230
MHz
LVCMOS PARAMETER
VIK
LVCMOS input voltage
VDD = 1.7 V; II = –18 mA
–1.2
V
II
LVCMOS input current
VI = 0 V or VDD; VDD = 1.9 V
±5
μA
IIH
LVCMOS input current for S0/S1/S2
VI = VDD; VDD = 1.9 V
5
μA
IIL
LVCMOS input current for S0/S1/S2
VI = 0 V; VDD = 1.9 V
–4
μA
Input capacitance at Xin/Clk
VICLK = 0 V or VDD
6
CI
Input capacitance at Xout
VIXout = 0 V or VDD
2
pF
Input capacitance at S0/S1/S2
VIS = 0 V or VDD
3
(1)
All typical values are at respective nominal VDD.
5
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