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CD74HC245E 데이터시트(PDF) 2 Page - Texas Instruments |
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CD74HC245E 데이터시트(HTML) 2 Page - Texas Instruments |
2 / 7 page 2 Description The Harris CD54HC245, CD54HCT245, and CD74HC245, CD74HCT245 are high-speed octal three-state bidirectional transceivers intended for two-way asynchronous communication between data buses. They have high drive current outputs which enable high-speed operation while driving large bus capacitances. They provide the low power consumption of standard CMOS circuits with speeds and drive capabilities comparable to that of LSTTL circuits. The CD54HC245, CD54HCT245, CD74HC245 and CD74HCT245 allow data transmission of the B bus or from the B bus to the A bus. The logic level at the direction input (DIR) determines the direction. The output enable input (OE), when high, puts the I/O ports in the high-impedance state. The HC/HCT245 is similar in operation to the HC/HCT640 and the HC/HCT643. Functional Diagram Ordering Information PART NUMBER TEMP. RANGE (oC) PACKAGE PKG. NO. CD54HC245F -55 to 125 20 Ld CERDIP F20.3 CD54HCT245F -55 to 125 20 Ld CERDIP F20.3 CD74HC245E -55 to 125 20 Ld PDIP E20.3 CD74HCT245E -55 to 125 20 Ld PDIP E20.3 CD74HC245M -55 to 125 20 Ld SOIC M20.3 CD74HCT245M -55 to 125 20 Ld SOIC M20.3 NOTES: 1. When ordering, use the entire part number. Add the suffix 96 to obtain the variant in the tape and reel. 2. Wafer or die for this part number is available which meets all elec- trical specifications. Please contact your local sales office or Harris customer service for ordering information. 18 17 16 15 13 11 12 14 2 B0 B1 B2 B3 B4 B5 B6 B7 OE DIR 1 19 4 9 3 5 6 7 8 A0 A1 A2 A3 A4 A5 A6 A7 TRUTH TABLE CONTROL INPUTS OPERATION OE DIR L L B Data to A Bus L H A Data to B Bus H X Isolation H = High Level, L = Low Level, X = Irrelevant To prevent excess currents in the High-Z (Isolation) modes all I/O terminals should be terminated with 10k Ω to 1MΩ resistors. CD54HC245, CD54HCT245, CD74HC245, CD74HCT245 CD54HC245, CD54HCT245, CD74HC245, CD74HCT245 |
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