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| nr | name | cat | description | manufacturer | 
|---|---|---|---|---|
| 549 | AD549 | amp | Ultralow Input Bias Current Operational Amplifier, data | AD | 
| 549 | TLC549 | adc,spi | ADC, 8-bit single-channel | TI | 
| 5490 | counter | 4-Bit Decade Counter | NS | |
| 54913 | counter | Up/Down Binary Counter | NS | |
| 5495 | shift | 4-Bit Right/Left Shift Register | NS | |
| 5497 | mult | Synchronous Module 64-Bit Rate Multiplier | NS | 
| www.chipdocs.com/ | Very good! | 
| www.icmaster.com/ | Registration is needed in advance. Will be closed spring 2002. | 
| www.questlink.com/ | Registration is needed before you can download datasheets. Chips can sometimes be ordered via Arrow/Avnet. | 
| www.elisnet.or.jp/ | In Japanese only. | 
| www.findchips.com/ | Do a search at 20+ distributors at once! | 
| www.netcomponents.com/ | Do a search for scarce chips at many brokers at once! | 
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