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74HC643 数据表(PDF) 2 Page - NXP Semiconductors |
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74HC643 数据表(HTML) 2 Page - NXP Semiconductors |
2 / 6 page December 1990 2 Philips Semiconductors Product specification Octal bus transceiver; 3-state; true/inverting 74HC/HCT643 FEATURES • Octal bidirectional bus interface • True and inverting 3-state outputs • Output capability: bus driver • ICC category: MSI GENERAL DESCRIPTION The 74HC/HCT643 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A. The 74HC/HCT643 are octal transceivers featuring true and inverting 3-state bus compatible outputs in both send and receive directions. The “643” features an output enable (OE) input for easy cascading and a send/receive (DIR) for direction control. OE controls the outputs so that the buses are effectively isolated. QUICK REFERENCE DATA GND = 0 V; Tamb =25 °C; tr =tf =6ns Notes 1. CPD is used to determine the dynamic power dissipation (PD in µW): PD =CPD × VCC2 × fi + ∑ (CL × VCC2 × fo) where: fi = input frequency in MHz fo = output frequency in MHz ∑ (CL × VCC2 × fo) = sum of outputs CL = output load capacitance in pF VCC = supply voltage in V 2. For HC the condition is VI = GND to VCC For HCT the condition is VI = GND to VCC −1.5 V ORDERING INFORMATION See “74HC/HCT/HCU/HCMOS Logic Package Information”. SYMBOL PARAMETER CONDITIONS TYPICAL UNIT HC HCT tPHL/ tPLH propagation delay An to Bn; inverting Bn to An; true CL = 15 pF; VCC = 5 V 7 8 8 11 ns ns CI input capacitance 3.5 3.5 pF CI/O input/output capacitance 10 10 pF CPD power dissipation capacitance per transceiver notes 1 and 2 42 44 pF |
类似零件编号 - 74HC643 |
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类似说明 - 74HC643 |
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