ONE-OF-TEN DECODER The LSTTL/MSI SN54/74LS42 is a Multipurpose Decoder designed to ac-cept four BCD inputs and provide ten mutually exclusive outputs. The LS42 is fabricated with the Schottky barrier diode process for high speed and is completely compatible with all Motorola TTL families. •Multifunction Capability •Mutually Exclusive Outputs • 2-wire Serial Interface • Schmitt Triggers, Filtered Inputs for Noise Suppression • Bi-directional Data Transfer Protocol • 400 kHz (2.7V) and 1 MHz (5V) Clock Rate • Write Protect Pin for Hardware and Software Data Protection • 256-byte Page Write Mode (Partial Page Writes Allowed) • Random and Sequential Read Modes AT24C128/256 3 Note: This parameter is characterized and is not 100% tested. Note: 1. VIL min and VIH max are reference only and are not tested Pin Capacitance(1) Applicable over recommended operating range from TA = 25°C, f = 1.0 MHz, VCC = +1.8V.