74ALS646/646-1 Octal transceiver/register, non-inverting (3-State)
74ALS648/648-1 Octal transceiver/register, inverting (3-State)

DESCRIPTION
The 74ALS646/74ALS646-1 and 74ALS648/74ALS648-1 transceivers/registers consist of bus transceiver circuits with 3-State outputs, D-type flip-flops, and control circuitry arranged for multiplexed transmission of data directly from the input bus or the internal registers. Data on the A or B bus will be clocked into the registers as the appropriate clock pin goes High. Output enable (OE) and direction (DIR) and select (SAB, SBA) pins are provided for bus management.

FEATURES
• Combines 74ALS245 and two 74ALS374 type functions in one chip
• Independent registers for A and B buses
• Multiplexed real-time and stored data
• Choice of non-inverting and inverting data paths
• 3-State outputs
• The -1 version sink 48mA IOL within the ±5% VCC range