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SC16IS750IBS Datasheet(HTML) 58 Page - NXP Semiconductors

Part No. SC16IS750IBS
Description  Single UART with I2C-bus/SPI interface, 64 bytes of transmit and receive FIFOs, IrDA SIR built-in support
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Maker  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
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SC16IS750IBS Datasheet(HTML) 58 Page - NXP Semiconductors

 
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SC16IS740_750_760_6
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 06 — 13 May 2008
58 of 62
NXP Semiconductors
SC16IS740/750/760
Single UART with I2C-bus/SPI interface, 64-byte FIFOs, IrDA SIR
Process issues, such as application of adhesive and flux, clinching of leads, board
transport, the solder wave parameters, and the time during which components are
exposed to the wave
Solder bath specifications, including temperature and impurities
17.4 Reflow soldering
Key characteristics in reflow soldering are:
Lead-free versus SnPb soldering; note that a lead-free reflow process usually leads to
higher minimum peak temperatures (see Figure 44) than a SnPb process, thus
reducing the process window
Solder paste printing issues including smearing, release, and adjusting the process
window for a mix of large and small components on one board
Reflow temperature profile; this profile includes preheat, reflow (in which the board is
heated to the peak temperature) and cooling down. It is imperative that the peak
temperature is high enough for the solder to make reliable solder joints (a solder paste
characteristic). In addition, the peak temperature must be low enough that the
packages and/or boards are not damaged. The peak temperature of the package
depends on package thickness and volume and is classified in accordance with
Table 41 and 42
Moisture sensitivity precautions, as indicated on the packing, must be respected at all
times.
Studies have shown that small packages reach higher temperatures during reflow
soldering, see Figure 44.
Table 41.
SnPb eutectic process (from J-STD-020C)
Package thickness (mm)
Package reflow temperature (
°C)
Volume (mm3)
< 350
≥ 350
< 2.5
235
220
≥ 2.5
220
220
Table 42.
Lead-free process (from J-STD-020C)
Package thickness (mm)
Package reflow temperature (
°C)
Volume (mm3)
< 350
350 to 2000
> 2000
< 1.6
260
260
260
1.6 to 2.5
260
250
245
> 2.5
250
245
245


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