DM74ALS138 Datasheet | National Semiconductor

Description These Schottky-clamped circuits are designed to be used in high-performance memory-decoding or data-routing applications requiring very short propagation delay times In high-performance memory systems these decoders can be used to minimize the effects of system decoding When used with high-speed memories the delay times of these decoders are usually less than the typical access time of the memory This means that the effective system delay introduced by the decoder is negligible The ALS138 decodes one-of-eight lines based upon the conditions at the three binary select inputs and the three enable inputs Two active-low and one active-high enable inputs reduce the need for external gates or inverters when expanding A 24-line decoder can be implemented with no external inverters and 32-line decoder requires only one inverter An enable input can be used as a data input for demultiplexing applications This decoder demultiplexer features fully buffered inputs presenting only one normalized load to its driving circuit All inputs are clamped with high-performance Schottky diodes to suppress line-ringing and simplify system design Features Y Designed specifically for high speed Memory decoders Data transmission systems Y 3- to 8-line decoder incorporates 3 enable inputs to simplify cascading and or data reception Y Low power dissipation 23 m W typ Y Switching specifications guaranteed over full tempera- ture and VCC range Y Advanced oxide-isolated ion-implanted Schottky TTL process Connection Diagram Dual-In-Line Package TL F 6111 - 1 Order Number DM74ALS138M DM74ALS138N or DM74ALS138SJ See NS Package Number M16A M16D or N16A C1995 National Semiconductor Corporation TL F 6111 RRD-B30M105 Printed in U S A Absolute Maximum Ratings Supply Voltage 7V Input Voltage 7V Operating Free Air Temperature Range DM74ALS 0 C to a70 C Storage Temperature Range b65 C to a150 C Typical i JA N Package M Package 75 5 C W 104 0 C W Remended Operating Conditions Symbol...