Nxp 74hc series logic devices nxp 74hc132d 652 the 74hc132d is a quad 2 input nand gate with schmitt trigger inputs this device features reduced input threshold levels to allow interfacing to ttl logic levels inputs also include clamp diodes that enable the use of current limiting resistors to interface inputs to voltages in excess of vcc schmitt trigger inputs transform slowly changing input signals into sharply defined jitter free output signals nxp 74hc132d 652 smd hcmos 2 schmitt nand