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74VHCT245AM Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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74VHCT245AM Datasheet(HTML) 1 Page - Fairchild Semiconductor |
1 / 6 page March 1997 Revised March 1999 © 1999 Fairchild Semiconductor Corporation DS500004.prf www.fairchildsemi.com 74VHCT245A Octal Buffer/Line Driver with 3-STATE Outputs General Description The VHCT245A is an advanced high speed CMOS octal bus transceiver fabricated with silicon gate CMOS technol- ogy. It achieves high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation. The VHCT245A is intended for bidirec- tional asynchronous communication between data busses. The direction of data transmission is determined by the level of the T/R input. The enable input can be used to dis- able the device so that the busses are effectively isolated. Protection circuits ensure that 0V to 7V can be applied to the input and output (Note 1) pins without regard to the supply voltage. These circuits prevent device destruction due to mismatched supply and input/output voltages. This device can be used to interface 5V to 3V systems and two supply systems such as battery back up. Note 1: Outputs in OFF-State Features s High Speed: tPD = 5.4 ns (typ) at VCC = 5V s Power Down Protection on Inputs and Outputs s Low Power Dissipation: ICC = 4 µA (Max) @ TA = 25°C s Pin and Function Compatible with 74HCT245 Ordering Code: Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Logic Symbol IEEE/IEC Pin Descriptions Connection Diagram Truth Table H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Order Number Package Number Package Description 74VHCT245AM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 74VHCT245ASJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 74VHCT245AMTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide 74VHCT245AN N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Pin Names Description OE Output Enable Input T/R Transmit/Receive Input A0–A7 Side A Inputs or 3-STATE Outputs B0–B7 Side B Inputs or 3-STATE Outputs Inputs Outputs OE T/R L L Bus B Data to Bus A L H Bus A Data to Bus B H X HIGH-Z State |
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