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Breaded Electronics / Embedded » Reference Designs - Circuit Solution notes » Level Translation
PCA9306 Bidirectional I2C
Dual Bi-Directional I2C-Bus and SMBus Voltage Level-Translator incorporates ESD protection
TXB0104
4-Bit Bidirectional Voltage-Level Translator with Auto Direction Sensing and +/-15 kV ESD Protect
http://www.semtech.com/products/IO-Expander-Lowest-Voltage-IO-Expander-family.jsp
TI notes: http://focus.tij.co.jp/jp/lit/an/scea035a/scea035a.pdf
Maxim: http://www.maxim-ic.com/appnotes.cfm/an_pk/3007
http://www.interfacebus.com/Design_Translation.html
Google for: auto direction sensing bidirectional level translator
Good article on restrictions of auto direction solutions http://www.wirelessdesignmag.com/pdfs/wdd060401_feature1.pdf
http://www.standardics.nxp.com/support/documents/i2c/pdf/an97055.pdf
http://forum.sparkfun.com/viewtopic.php?p=16942
http://delphys.net/d.holmes/hardware/levelshift.html
NXT http://www.standardics.nxp.com/support/documents/logic/pdf/an10156.pdf
LV/LVX | LVC/LCX | ALVC | LVT |
9 ns typical tPD | 4 ns typical tPD | 2 ns typical tPD | 2 ns typical tPD |
6-8 mA IOH/IOL | 24 mA IOH/IOL | 24 mA IOH/IOL | 32/64 mA IOH/IOL |
130 ohm line drive | 50 ohm line drive | 50 ohm line drive | 35 ohm line drive |
20 mA standby current | 10 mA standby current | 40 mA standby current | 190 mA standby current |
VCC: 1 - 3.6 V | VCC: 1.2 - 3.6 V | VCC: 1.2 - 3.6 V | VCC: 2.7 - 3.6 V |
Gates, MSI, bus interface functions | Gates, MSI, 8/16/32 bit bus interface functions | Gates, MSI, 8/16/32 bit bus interface functions | Gates, MSI, 8/16/32 bit bus |
interface functions |
|
|
|
5 V tolerant inputs 1 | Termination resistor option | Termination resistor option | Termination resistor option |
| 5 V tolerant I/O | 5 V tolerant inputs 2 | 5 V tolerant I/O |
| Supports hot swap | Bus hold feature | Supports hot swap |
| Bus hold feature |
| Bus hold feature |
Notes:
1. Vendor dependent
2. Vendor dependent
Propagation delays are approximate typicals for a '245 function
http://www.standardics.nxp.com/support/techtips/levelshift/