TS556CDT

Overview

The TS556CDT is a dual CMOS timer manufactured by STMicroelectronics, housed in a 14-SOIC surface-mount package. It operates within a supply voltage range of 2 V to 16 V and supports a maximum astable frequency of 2.7 MHz. The device features low power consumption, with typical currents of 220 μA at 5 V and 180 μA at 3 V. It offers high input impedance (10^12 Ω) and reduced supply current spikes during output transitions, allowing for smaller decoupling capacitors compared to bipolar equivalents.

Feature Summary

• Dual CMOS timer architecture with pin-to-pin compatibility to bipolar NE556
• Maximum astable frequency of 2.7 MHz
• Low power consumption: 220 μA typ at VCC = 5 V
• High input impedance of 10^12 Ω

Applications

• Precision timing circuits in monostable mode
• Programmable oscillators in astable mode
• DC-DC converter control loops
• Sequential timing events

Procurement Notes

Verify the specific suffix 'CDT' against official STMicroelectronics documentation to confirm the exact temperature grade and tape-and-reel packaging configuration. Cross-reference the part number with current distributor listings to ensure availability status, as some variants may be discontinued or subject to product change notifications.

Selection Notes

Select the TS556CDT when low power consumption and high-frequency operation are required in a surface-mount design. Ensure the application voltage stays within the 2 V to 16 V range. Consider the 14-SOIC package constraints for PCB layout. Verify that the load requirements align with the CMOS/TTL output drive capabilities specified in the datasheet.

Part Context

The TS556 series represents STMicroelectronics' low-power CMOS alternative to standard bipolar dual timers. It belongs to the same family as the TS555 (single channel). The 'C' typically denotes commercial temperature range, while 'DT' indicates the SOIC package and tape-and-reel delivery method.

Replacement Considerations

The TS556CDT is functionally compatible with the NE556. Other valid substitutes include the ICM7556 and LMC556D, provided they meet the 2.7 MHz frequency and voltage specifications.