Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

1500457 Datasheet(PDF) 81 Page - Freescale Semiconductor, Inc

Part No. 1500457
Description  Integrated Host Processor Hardware Specifications
Download  87 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

1500457 Datasheet(HTML) 81 Page - Freescale Semiconductor, Inc

Back Button 1500457 Datasheet HTML 77Page - Freescale Semiconductor, Inc 1500457 Datasheet HTML 78Page - Freescale Semiconductor, Inc 1500457 Datasheet HTML 79Page - Freescale Semiconductor, Inc 1500457 Datasheet HTML 80Page - Freescale Semiconductor, Inc 1500457 Datasheet HTML 81Page - Freescale Semiconductor, Inc 1500457 Datasheet HTML 82Page - Freescale Semiconductor, Inc 1500457 Datasheet HTML 83Page - Freescale Semiconductor, Inc 1500457 Datasheet HTML 84Page - Freescale Semiconductor, Inc 1500457 Datasheet HTML 85Page - Freescale Semiconductor, Inc Next Button
Zoom Inzoom in Zoom Outzoom out
 81 / 87 page
background image
MPC8349EA PowerQUICC II Pro Integrated Host Processor Hardware Specifications, Rev. 13
Freescale Semiconductor
81
System Design Information
have a low ESR (equivalent series resistance) rating to ensure the quick response time. They should also
be connected to the power and ground planes through two vias to minimize inductance. Suggested bulk
capacitors are 100–330 µF (AVX TPS tantalum or Sanyo OSCON).
21.4
Connection Recommendations
To ensure reliable operation, connect unused inputs to an appropriate signal level. Unused active low
inputs should be tied to OVDD, GVDD, or LVDD as required. Unused active high inputs should be
connected to GND. All NC (no-connect) signals must remain unconnected.
Power and ground connections must be made to all external VDD, GVDD, LVDD, OVDD, and GND pins of
the MPC8349EA.
21.5
Output Buffer DC Impedance
The MPC8349EA drivers are characterized over process, voltage, and temperature. For all buses, the
driver is a push-pull single-ended driver type (open drain for I2C).
To measure Z0 for the single-ended drivers, an external resistor is connected from the chip pad to OVDD
or GND. Then the value of each resistor is varied until the pad voltage is OVDD/2 (see Figure 43). The
output impedance is the average of two components, the resistances of the pull-up and pull-down devices.
When data is held high, SW1 is closed (SW2 is open) and RP is trimmed until the voltage at the pad equals
OVDD/2. RP then becomes the resistance of the pull-up devices. RP and RN are designed to be close to each
other in value. Then, Z0 = (RP + RN) ÷ 2.
Figure 43. Driver Impedance Measurement
Two measurements give the value of this resistance and the strength of the driver current source. First, the
output voltage is measured while driving logic 1 without an external differential termination resistor. The
measured voltage is V1 = Rsource × Isource. Second, the output voltage is measured while driving logic 1
with an external precision differential termination resistor of value Rterm. The measured voltage is
OVDD
OGND
RP
RN
Pad
Data
SW1
SW2


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40  41  42  43  44  45  46  47  48  49  50  51  52  53  54  55  56  57  58  59  60  61  62  63  64  65  66  67  68  69  70  71  72  73  74  75  76  77  78  79  80  81  82  83  84  85  86  87 


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn