No Translation required for the following:
[TTL] to [TTL]
[TTL] to [CMOS with input switching at TTL levels]
[CMOS 5V] to [TTL]
Translation required for the following:
[TTL] to [CMOS*]
Pull up of 1k to 2k required
TTL outputs 2.4V to 3.3V for a high level
CMOS required 3.7 for high level.
The pull up resister increases the output voltage (of TTL driver).
[CMOS*] to [TTL]
*The translation depends on the VCC of CMOS device.
[TTL] to [ECL] / [ECL] to [TTL]
TTL to ECL (ECL to TTL) translator along with ECL termination resistors are needed.
[PECL] to [TTL] / [TTL] to [PECL]
PECL is Positive ECL
PECL to TTL (TTL to PECL) translator needed.
[PECL] to [CMOS] / [CMOS] to [PECL]
Same as above, but pull of 1k to 2k is required for CMOS.
[PECL 5V] to [LVDS 5V]
Pull up both +,- signals to 3V through 50E resistors.
[LVPECL 3.3V] to [LVDS 5V]
Pull up both +,- signals to 1.3V through 50E resistors