74VHCT240AFT,74VHCT244AFT CMOS Digital Integrated Circuits Silicon Monolithic 74VHCT240AFT,74VHCT244AFT74VHCT240AFT,74VHCT244AFT74VHCT240AFT,74VHCT244AFT74VHCT240AFT,74VHCT244AFT 1. 1. Functional DescriptionFunctional Description 1. 1. Functional DescriptionFunctional Description Octal Bus Buffer 74VHCT240AFT: INVERTED, 3-STATE OUTPUTS 74VHCT244AFT: NON-INVERTED, 3-STATE OUTPUTS 2. 2. 2. 2. GeneralGeneralGeneralGeneral The 74VHCT240AFT and 74VHCT244AFT are advanced high speed CMOS OCTAL BUS BUFFERs fabricated with silicon gate C2MOS technology. They achieve the high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation. The 74VHCT240AFT is an inverting 3-state buffer having two active-low output enables. The 74VHCT244AFT is a non-inverting 3-state buffer, and has two active-low output enables. These devices are designed to be used with 3-state memory address drivers, etc. The input voltage are compatible with TTL output voltage. These devices may be used as a level converter for interfacing 3.3 V to 5 V system. Input protection and output circuit ensure that 0 to 5.5 V can be applied to the input and output (Note) pins without regard to the supply voltage. These structure prevents device destruction due to mismatched supply and input/output voltages such as battery back up, hot board insertion, etc. Note: Output in off-state 3. 3. FeaturesFeatures 3. 3. FeaturesFeatures (1) AEC-Q100 (Rev. H) (Note 1) (2) Wide operating temperature range: T = -40 to 125 opr (3) High speed: Propagation delay time = 6.1 ns (typ.) at V = 5.0 V CC (4) Quiescent supply current: I = 4.0 A (max) at T = 25 CC a (5) Compatible with TTL input: V = 0.8 V (max) IL V = 2.0 V (min) IH (6) Power down protection is provided on all inputs and outputs. (7) Balanced propagation delays: t t PLH PHL (8) Low noise: V = 1.0 V (max) OLP (9) Pin and function compatible with the 74 series (ACT/HCT/AHCT etc.) 240/244 type. Note 1: This device is compliant with the reliability requirements of AEC-Q100. For details, contact your Toshiba sales representative. Start of commercial production 2013-01 2017 Toshiba Corporation 2017-02-23 1 Rev.4.074VHCT240AFT,74VHCT244AFT 4. 4. 4. 4. PackagingPackagingPackagingPackaging TSSOP20B 5. 5. 5. 5. Pin AssignmentPin AssignmentPin AssignmentPin Assignment 74VHCT240AFT 74VHCT244AFT 6. Marking 6. 6. 6. MarkingMarkingMarking 74VHCT240AFT 74VHCT244AFT 2017 Toshiba Corporation 2017-02-23 2 Rev.4.0