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74F646D
54F 74F646 74F646B 54F 74F648 Octal Transceiver Register with TRI-STATE Outputs General Description Features These devices consist of bus transceiver circuits with TRISTATE D-type flip-flops and control circuitry arranged for multiplexed transmission of data directly from the input bus or from the internal registers Data on the A or B bus will be clocked into the registers as the appropriate clock pin goes to a high logic level Control G and direction pins are provided to control the transceiver function In the transceiver mode data present at the high impedance port may be stored in either the A or the B register or in both The select controls can multiplex stored and real-time (transparent mode) data The direction control determines which bus will receive data when the enable control G is Active LOW In the isolation mode (control G HIGH) A data may be stored in the B register and or B data may be stored in the A register Y Commercial Package Number Military 74F646SPC N24C 54F646DM (Note 2) Y Y Y Y Y Y Y Independent registers for A and B buses Multiplexed real-time and stored data ’F648 has inverting data paths ’F646 ’F646B have non-inverting data paths ’F646B is a faster version of the ’F646 TRI-STATE outputs 300 mil slim DIP Guaranteed 4000V minimum ESD protection Package Description 24-Lead (0 300 Wide) Molded Dual-In-Line J24F 24-Lead (0 300 Wide) Ceramic Dual-In-Line 74F646SC (Note 1) M24B 24-Lead (0 300 Wide) Molded Small Outline JEDEC 74F646MSA (Note 1) MSA24 24-Lead Molded Shrink Small Outline EIAJ Type II 54F646FM (Note 2) W24C 24-Lead Cerpack 54F646LM (Note 2) E28A 28-Lead Ceramic Leadless Chip Carrier Type C 74F646BSPC N24C 24-Lead (0 300 Wide) Molded Dual-In-Line 74F646BSC (Note 1) M24B 24-Lead (0 300 Wide) Molded Small Outline JEDEC N24C 24-Lead (0 300 Wide) Molded Dual-In-Line 74F648SPC 54F648SDM (Note 2) J24F 24-Lead (0 300 Wide) Ceramic Dual-In-Line M24B 24-Lead (0 300 Wide) Molded Small Outline JEDEC 54F648FM (Note 2) W24C 24-Lead Cerpack 54F648LM (Note 2) E28A 24-Lead Ceramic Leadless Chip Carrier Type C 74F648SC (Note 1) Note 1 Devices also available in 13 reel Use suffix e SCX Note 2 Military grade device with environmental and burn-in processing Use suffix e DMQB FMQB and LMQB Logic Symbols ’F646 ’F646B ’F648 TL F 9580 – 1 TL F 9580 – 7 TRI-STATE is a registered trademark of National Semiconductor Corporation C1995 National Semiconductor Corporation TL F 9580 RRD-B30M75 Printed in U S A 54F 74F646 74F646B 54F 74F648 Octal Transceiver Register with TRI-STATE Outputs December 1994 Unit Loading Fan Out 54F 74F Pin Names Description A0 – A7 UL HIGH LOW Data Register A Inputs TRI-STATE Outputs B0 – B7 Data Register B Inputs TRI-STATE Outputs CPAB CPBA Clock Pulse Inputs SAB SBA Select Inputs G Output Enable Input DIR Direction Control Input Input IIH IIL Output IOH IOL 3 5 1 083 70 mA b650 mA 600 106 6 (80) b12 mA 64 mA (48 mA) 3 5 1 083 70 mA b650 mA 600 106 6 (80) b12 mA 64 mA (48 mA) 10 10 20 mA b0 6 mA 10 10 20 mA b0 6 mA 10 10 20 mA b0 6 mA 10 10 20 mA b0 6 mA Function Table Inputs Data I O Function G DIR CPAB CPBA SAB SBA A0 –A7 B0 –B7 H H H X X X H or L L X H or L X L X X X X X X Input Input L L L L H H H H X L H or L L X X X X L L H H X X X X Input Output An to Bn Real Time (Transparent Mode) Clock An Data into A Register A Register to Bn (Stored Mode) Clock An Data into A Register and Output to Bn L L L L L L L L X X X X X L H or L L X X X X L L H H Output Input Bn to An Real Time (Transparent Mode) Clock Bn Data into B Register B Register to An (Stored Mode) Clock Bn Data into B Register and Output to An Isolation Clock An Data into A Register Clock Bn Data into B Register The data output functions may be enabled or disabled by various signals at the G and DIR Inputs Data input functions are always enabled i e data at the bus pins will be stored on every LOW-to-HIGH transition of the clock inputs H e HIGH Voltage Level L e LOW Voltage Level X e Irrelevant L e LOW-to-HIGH Transition 3
MOTOROLA
モトローラ（Motorola, Inc., NYSE:MOT）は、かつて存在したアメリカ合衆国の電子・通信機器メーカーである。 2011年1月4日をもって、二つの独立した公開会社であるモトローラ・モビリティ及びモトローラ・ソリューションズに分割された[1]。本社所在地はシカゴ近郊のイリノイ州シャンバーグであり、分割以降はモトローラ・ソリューションズが引き継いでいる
Motorola, Incorporated
U.S.A
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