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MM74HC646 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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MM74HC646 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 6 page  TLF5345 January 1988 MM54HC646MM74HC646 Non-Inverting Octal Bus TransceiverRegisters MM54HC648MM74HC648 Inverting Octal Bus TransceiverRegisters General Description These transceivers utilize advanced silicon-gate CMOS technology and contain two sets of TRI-STATE outputs two sets of D-type flip-flops and control circuitry designed for high speed multiplexed transmission of data Six control inputs enable this device to be used as a latched transceiver unlatched transceiver or a combination of both As a latched transceiver data from one bus is stored for later retrieval by the other bus Alternately real time bus data (unlatched) may be directly transferred from one bus to another Circuit operation is determined by the G DIR CAB CBA SAB SBA control inputs The enable input G controls whether any bus outputs are enabled The direction control DIR determines which bus is enabled and hence the direc- tion data flows The SAB SBA inputs control whether the latched data (stored in D type flip flops) or the bus data (from other bus input pins) is transferred Each set of flip- flops has its own clock CAB and CBA for storing data Data is latched on the rising edge of the clock Each output can drive up to 15 low power Schottky TTL loads These devices are functionally and pin compatible to their LS-TTL counterparts All inputs are protected from damage due to static discharge by diodes to VCC and ground Features Y Typical propagation delay 14 ns Y TRI-STATE outputs Y Bidirectional communication Y Wide power supply range 2 – 6V Y Low quiescent supply current 160 mA maximum (74HC) Y High output current 6 mA (74HC) Connection Diagram Dual-In-Line Package TLF5345 – 2 Order Number MM54HC646648 or MM74HC646648 TLF5345 – 1 Real-Time Transfer Bus B to Bus A Real-Time Transfer Bus A to Bus B Storage from A B or A and B Transfer Stored Data toAorB TRI-STATE is a registered trademark of National Semiconductor Corp C1995 National Semiconductor Corporation RRD-B30M105Printed in U S A |
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Similar Description - MM74HC646 |
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