PCK9448BD,157 NXP Semiconductors, PCK9448BD,157 Datasheet

IC FANOUT BUFFER 1:12 32LQFP

PCK9448BD,157

Manufacturer Part Number
PCK9448BD,157
Description
IC FANOUT BUFFER 1:12 32LQFP
Manufacturer
NXP Semiconductors
Type
Fanout Buffer (Distribution), Multiplexerr
Datasheet

Specifications of PCK9448BD,157

Number Of Circuits
1
Ratio - Input:output
2:12
Differential - Input:output
Yes/Yes
Input
LVCMOS, LVPECL
Output
LVCMOS
Frequency - Max
350MHz
Voltage - Supply
2.375 V ~ 3.465 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
32-LQFP
Frequency-max
350MHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
568-3566
935280284157
PCK9448BD

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Part Number
Manufacturer
Quantity
Price
Part Number:
PCK9448BD,157
Manufacturer:
NXP Semiconductors
Quantity:
10 000
1. General description
2. Features
The PCK9448 is a 3.3 V or 2.5 V compatible, 1 : 12 clock fan-out buffer targeted for high
performance clock tree applications. With output frequencies up to 350 MHz and output
skews less than 150 ps, the device meets the needs of most demanding clock
applications.
The PCK9448 is specifically designed to distribute LVCMOS compatible clock signals up
to a frequency of 350 MHz. Each output provides a precise copy of the input signal with
near zero skew. The output buffers support driving of 50
on the incident edge: each is capable of driving either one parallel terminated or two
series terminated transmission lines.
Two selectable independent clock inputs are available, providing support of LVCMOS and
differential LVPECL clock distribution systems. The PCK9448 CLK_STOP control is
synchronous to the falling edge of the input clock. It allows the start and stop of the output
clock signal only in a logic LOW state, thus eliminating potential output runt pulses.
Applying the OE control will force the outputs into high-impedance mode.
All inputs have an internal pull-up or pull-down resistor preventing unused and open inputs
from floating. The device supports a 2.5 V or 3.3 V power supply and an ambient
temperature range of 40 C to +85 C.
PCK9448
3.3 V/2.5 V LVCMOS 1 : 12 clock fan-out buffer
Rev. 01 — 29 November 2005
12 LVCMOS compatible clock outputs
Selectable LVCMOS and differential LVPECL compatible clock inputs
Maximum clock frequency of 350 MHz
Maximum clock skew of 150 ps
Synchronous output stop in logic LOW state eliminates output runt pulses
High-impedance output control
3.3 V or 2.5 V power supply
Drives up to 24 series terminated clock lines
T
Available in LQFP32 package
Supports clock distribution in networking, telecommunications, and computer
applications
amb
= 40 C to +85 C
Product data sheet
terminated transmission lines

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PCK9448BD,157 Summary of contents

Page 1

PCK9448 3.3 V/2.5 V LVCMOS clock fan-out buffer Rev. 01 — 29 November 2005 1. General description The PCK9448 2.5 V compatible clock fan-out buffer targeted for high performance ...

Page 2

Philips Semiconductors 3. Ordering information Table 1: Type number PCK9448BD 4. Functional diagram Fig 1. Functional diagram of PCK9448 9397 750 12534 Product data sheet 3.3 V/2.5 V LVCMOS clock fan-out buffer Ordering information Package Name Description ...

Page 3

Philips Semiconductors 5. Pinning information 5.1 Pinning Fig 2. Pin configuration for LQFP32 5.2 Pin description Table 2: Symbol CLK_SEL CCLK PCLK PCLK CLK_STOP Q11 GND V CC 9397 750 12534 Product data sheet 3.3 V/2.5 ...

Page 4

Philips Semiconductors 6. Functional description Refer to 6.1 Function table Table 3: Control CLK_SEL OE CLK_STOP [ will high-impedance 3-state all outputs independent of CLK_STOP. 7. Limiting values Table 4: In accordance with the Absolute Maximum Rating ...

Page 5

Philips Semiconductors 8.2 Static characteristics Table 6: Static characteristics (3 + 3.3 V amb CC Symbol Parameter V HIGH-state input voltage IH V LOW-state input voltage IL V HIGH-state output voltage ...

Page 6

Philips Semiconductors 8.3 Dynamic characteristics Table 8: Dynamic characteristics (3 + 3.3 V amb CC Symbol Parameter V input voltage (peak-to-peak value) i(p-p) (PCLK, PCLK) [2] V common-mode input voltage range ...

Page 7

Philips Semiconductors Table 9: Dynamic characteristics (2 + 2.5 V amb CC Symbol Parameter V input voltage (peak-to-peak value) i(p-p) (PCLK, PCLK) [2] V common-mode input voltage range ICR (PCLK, PCLK) ...

Page 8

Philips Semiconductors CCLK or PCLK CLK_STOP Q0 to Q11 Fig 3. Output clock stop (CLK_STOP) timing diagram The variation in cycle time of a signal between adjacent cycles, over a random sample of adjacent cycle pairs. Fig 4. Cycle-to-cycle jitter ...

Page 9

Philips Semiconductors PCLK PCLK t t PLH Qn Fig 5. Propagation delay test reference (PCLK/PCLK to Qn) Fig 7. Pulse skew time (t ) test reference sk(p) t sk(o) The pin-to-pin skew is defined as the worst-case difference in propagation ...

Page 10

Philips Semiconductors 9. Application information 9.1 Driving transmission lines The PCK9448 clock driver was designed to drive high speed signals in a terminated transmission line environment. To provide the optimum flexibility to the user, the output drivers were designed to ...

Page 11

Philips Semiconductors The waveform plots of versus two lines. In both cases the drive capability of the PCK9448 output buffer is more than sufficient to drive 50 measurement in the simulations a delta of only 43 ps exists between the ...

Page 12

Philips Semiconductors Fig 14. Optimized dual line termination 9.2 Power consumption of the PCK9448 and thermal management The PCK9448 dynamic electrical (AC) specification is guaranteed for the entire operating frequency range up to 350 MHz. The PCK9448 power consumption and ...

Page 13

Philips Semiconductors tot + Equation signal duty cycle. If transmission lines are used, C eliminated. In general, the use of controlled transmission line techniques eliminates the impact of the ...

Page 14

Philips Semiconductors 10. Test information Fig 15. CCLK AC test reference for V Fig 16. PCLK AC test reference 9397 750 12534 Product data sheet 3.3 V/2.5 V LVCMOS clock fan-out buffer PCK9448 ...

Page 15

Philips Semiconductors 11. Package outline LQFP32: plastic low profile quad flat package; 32 leads; body 1 pin 1 index DIMENSIONS (mm are the original dimensions) ...

Page 16

Philips Semiconductors 12. Soldering 12.1 Introduction to soldering surface mount packages This text gives a very brief insight to a complex technology. A more in-depth account of soldering ICs can be found in our Data Handbook IC26; Integrated Circuit Packages ...

Page 17

Philips Semiconductors – smaller than 1.27 mm, the footprint longitudinal axis must be parallel to the transport direction of the printed-circuit board. The footprint must incorporate solder thieves at the downstream end. • For packages with leads on four sides, ...

Page 18

Philips Semiconductors [4] These packages are not suitable for wave soldering. On versions with the heatsink on the bottom side, the solder cannot penetrate between the printed-circuit board and the heatsink. On versions with the heatsink on the top side, ...

Page 19

Philips Semiconductors 15. Data sheet status [1] Level Data sheet status Product status I Objective data Development II Preliminary data Qualification III Product data Production [1] Please consult the most recently issued data sheet before initiating or completing a design. ...

Page 20

Philips Semiconductors 20. Contents 1 General description . . . . . . . . . . . . . . . . . . . . . . 1 2 Features . . . . . . . . ...

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