Short for Moisture Sensitivity Level, MSL is a JEDEC (Joint Electron Device Engineering Council) standard established for the purpose of preventing device failure due to volumetric expansion of atmospheric moisture introduced into the resin package of semiconductor devices during reflow. The floor life of IC packages, during which the components must be mounted and reflowed after opening the moisture-resistant packaging, is broken down into 8 MSL levels.
Its name derives from the fact that that switching transistors are designed in an 'H' configuration. Mainly used for forward and reverse control in DC motors, it can also be found in latching relay drive circuits. Other names include bridge driver and reversible motor driver.
CMOS output (complementary output) normally consists of a Pch MOS at the high output stage and an Nch MOS at the low output stage. An alternative configuration is NMOS output, comprised of Nch MOSFETs at both high and low sides. However, the high side Nch MOSFET requires a step-up voltage source for driving, such as a charge pump or bootstrap circuit, which necessitates an external capacitor. ROHM's H-bridge drivers are all CMOS type, eliminating the need for additional step-up circuits and external capacitors.
No time is required. Conventional products, due to the through-current that flows during switching from forward to reverse and vice versa, often require time to go into brake or standby mode. ROHM's H-bridge drivers, however, prevent through-current flow, resulting in no wait time.