74FCT388915TEJG8 IDT, 74FCT388915TEJG8 Datasheet

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74FCT388915TEJG8

Manufacturer Part Number
74FCT388915TEJG8
Description
Clock Drivers & Distribution
Manufacturer
IDT
Datasheet

Specifications of 74FCT388915TEJG8

Rohs
yes
Part # Aliases
IDT74FCT388915TEJG8
© 2004 Integrated Device Technology, Inc.
FEATURES:
• 0.5 MICRON CMOS Technology
• Input frequency range: 10MHz – f2Q Max. spec
• Max. output frequency: 150MHz
• Pin and function compatible with FCT88915T, MC88915T
• 5 non-inverting outputs, one inverting output, one 2x output,
• 3-State outputs
• Duty cycle distortion < 500ps (max.)
• 32/–16mA drive at CMOS output voltage levels
• V
• Inputs can be driven by 3.3V or 5V components
• Available in 28 pin PLCC and SSOP packages
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
IDT74FCT388915T
3.3V LOW SKEW PLL-BASED CMOS CLOCK DRIVER (3-STATE)
FUNCTIONAL BLOCK DIAGRAM
COMMERCIAL TEMPERATURE RANGE
(FREQ_SEL = HIGH)
one ÷2 output; all outputs are TTL-compatible
CC
= 3.3V ± 0.3V
FEED BAC K
FREQ_SEL
REF_SEL
SYNC (0)
SYNC (1)
PLL_EN
OE/RST
0
1
M
u
x
3.3V LOW SKEW PLL-BASED
CMOS CLOCK DRIVER
(WITH 3-STATE)
Phase/Freq.
Detector
0
Divide
-By-2
M ux
1
(
(
÷
÷
1)
2)
1
DESCRIPTION:
quency and phase of outputs to the input reference clock. It provides low
skew clock distribution for high performance PCs and workstations. One of
the outputs is fed back to the PLL at the FEEDBACK input resulting in
essentially zero delay across the device. The PLL consists of the phase/
frequency detector, charge pump, loop filter and VCO. The VCO is
designed for a 2Q operating frequency range of 40MHz to f2Q Max.
Q outputs. The 2Q runs at twice the Q frequency and Q/2 runs at half the
Q frequency.
path. PLL _EN allows bypassing of the PLL, which is useful in static test
modes. When PLL_EN is low, SYNC input may be used as a test clock. In
this test mode, the input frequency is not limited to the specified range and
the polarity of outputs is complementary to that in normal operation (PLL_EN
= 1). The LOCK output attains logic HIGH when the PLL is in steady-state
phase and frequency lock. When OE/RST is low, all the outputs are put in
high impedance state and registers at Q, Q and Q/2 outputs are reset.
recommended in Figure 3.
The FCT388915T uses phase-lock loop technology to lock the fre-
The FCT388915T provides 8 outputs, the Q5 output is inverted from the
The FREQ_SEL control provides an additional ÷ 2 option in the output
The FCT388915T requires one external loop filter component as
Charge Pum p
1
0
M
u
x
D
CP
D
CP
D
CP
D
CP
D
CP
D
CP
D
CP
R
R
R
R
R
R
R
COMMERCIAL TEMPERATURE RANGE
Q
Q
Q
Q
Q
Q
Q
Q
Controlled
Oscilator
Voltage
IDT74FCT388915T
70/100/133/150
OCTOBER 2008
LOCK
LF
2Q
Q0
Q1
Q2
Q3
Q4
Q5
Q/2
DSC-4243/7

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74FCT388915TEJG8 Summary of contents

Page 1

... SYNC (1) REF_SEL PLL_EN FREQ_SEL OE/RST The IDT logo is a registered trademark of Integrated Device Technology, Inc. COMMERCIAL TEMPERATURE RANGE © 2004 Integrated Device Technology, Inc. 3.3V LOW SKEW PLL-BASED CMOS CLOCK DRIVER (WITH 3-STATE) DESCRIPTION: The FCT388915T uses phase-lock loop technology to lock the fre- quency and phase of outputs to the input reference clock ...

Page 2

... IDT74FCT388915T 3.3V LOW SKEW PLL-BASED CMOS CLOCK DRIVER (3-STATE) PIN CONFIGURATION 1 GND OE/RST 5 FEEDBACK 6 REF_SEL 7 SYNC( (AN GND(AN) 10 SYNC( FREQ_SEL GND SSOP TOP VIEW PIN DESCRIPTION Pin Name I/O SYNC(0) I Reference clock input SYNC(1) I Reference clock input ...

Page 3

... IDT74FCT388915T 3.3V LOW SKEW PLL-BASED CMOS CLOCK DRIVER (3-STATE) ABSOLUTE MAXIMUM RATINGS Symbol Description V (2) Terminal Voltage with Respect to GND TERM (3) V Terminal Voltage with Respect to GND TERM (4) V Terminal Voltage with Respect to GND TERM T Storage Temperature STG I DC Output Current OUT NOTES: 1 ...

Page 4

... IDT74FCT388915T 3.3V LOW SKEW PLL-BASED CMOS CLOCK DRIVER (3-STATE) POWER SUPPLY CHARACTERISTICS Symbol Parameter ΔI Quiescent Power Supply Current CC TTL Inputs HIGH (4) I Dynamic Power Supply Current CCD C Power Dissipation Capacitance PD (6) I Total Power Supply Current C NOTES: 1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type. ...

Page 5

... Parameter t Rise/Fall Time RISE/FALL All Outputs (between 0.8V and 2V) PULSE WIDTH (3) t Output Pulse Width Q, Q, Q/2 outputs (3) Q0-Q4, Q5, Q/2, @ 1.5V t Output Pulse Width PULSE WIDTH (3) 2Q Output 2Q @ 1.5V t SYNC input to FEEDBACK delay PD (3) SYNC-FEEDBACK (measured at SYNC0 or 1 and FEEDBACK input pins Output to Output Skew between outputs 2Q, Q0-Q4, ...

Page 6

... All loop filter and analog isolation components should be tied as close to the package as possible. Stray current passing through the parasitics of long traces can cause undesirable voltage transients at the LF pin. b. The 10µF low frequency bypass capacitor and the 0.1µF high frequency bypass capacitor form a wide bandwidth filter that will minimize the 388915T's sensitivity to voltage transients from the system digital V supply and ground planes ...

Page 7

... IDT74FCT388915T 3.3V LOW SKEW PLL-BASED CMOS CLOCK DRIVER (3-STATE) The frequency relationship shown here is applicable to all Q outputs (Q0, Q1, Q2, Q3 and Q4). 1:2 INPUT TO "Q" OUTPUT FREQUENCY RELATIONSHIP In this application, the Q/2 output is connected to the FEEDBACK input. The internal PLL will line up the positive edges of Q/2 and SYNC, thus the Q/2 frequency will equal the SYNC frequency ...

Page 8

... IDT74FCT388915T 3.3V LOW SKEW PLL-BASED CMOS CLOCK DRIVER (3-STATE) CLOCK @ f SYSTEM CLO DISTRIBUTE CLO CLOCK @ 2f at point of use Figure 4. Multiprocessing Application Using the FCT388915T for Frequency Multiplication FCT388915T SYSTEM LEVEL TESTING FUNCTIONALITY When the PLL_EN pin is LOW, the PLL is bypassed and the FCT388915T is in low frequency " ...

Page 9

... IDT74FCT388915T 3.3V LOW SKEW PLL-BASED CMOS CLOCK DRIVER (3-STATE) TEST CIRCUITS AND WAVEFORMS Pulse D.U.T. Generator Ω Ω Ω Ω Ω / SYNC IN PUT (SYNC ( CYCLE SYNC IN PUT SYNC (0 FEED BAC K INPUT Q/2 OUTPUT ...

Page 10

... COMMERCIAL TEMPERATURE RANGE Plastic Leaded Chip Carrier PLCC - Green Small Shrink Outline IC SSOP - Green (1) 70MHz Max. Frequency (1) 100MHz Max. Frequency (1) 133MHz Max. Frequency (1) 150MHz Max. Frequency 3.3V Low skew PLL-based CMOS clock driver 0°C to +70°C for Tech Support: clockhelp@idt.com ...

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