The Art of Electronics (Horowitz & Hill, Cambridge University Press, ISBN 0-521-37095-7) On page 574 is a nice little table that lists what you can drive with what.
| From To-> | TTL | HCT/ACT | HC/AC | 4000B/74C@5v |
| TTL | OK | OK | 1 | 1 |
| HCT/ACT | OK | OK | OK | OK |
| HC/AC | OK | OK | OK | OK |
| 4000B/74C@5v | OK* | OK | OK | OK |
1 pullup to +5V, or use HCT as interface.
NEW! RLC-2 RS232 Level Converter in a DB9 backshell
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| file: /techref/logic/levelconversion.htm, 1KB, , updated: 2008/8/29 08:50, local time: 2008/11/22 11:35,
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