The NE556 bipolar timer contains two NE555 timers in the same package, with common power-supply and ground pins. The LinCMOS version of the dual 555 timer is the TLC556. See Figure 7-8 for the pinout of these devices.
The TLC556 dual timer is identical to the NE556 electrically and functionally. It is fabricated using the LinCMOS process and has tile same advantages noted for the TLC555.