74HC643
FEATURES
- Octal bidirectional bus interface
- True and inverting 3-state outputs
- Output capability: bus driver
- ICC category: MSI GENERAL DESCRIPTION
74HC/HCT643
The 74HC/HCT643 are high-speed Si-gate CMOS devices and are pin patible with low power Schottky TTL (LSTTL). They are specified in pliance with JEDEC standard no. 7A. The 74HC/HCT643 are octal transceivers featuring true and inverting 3-state bus patible 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 = 6 ns TYPICAL SYMBOL t PHL/ t PLH PARAMETER propagation delay An to Bn; inverting Bn to An; true input capacitance input/output capacitance power dissipation capacitance per transceiver notes 1 and 2 CONDITIONS HC CL = 15 p F; VCC = 5 V 7 8 3.5 10 42 8 11 3.5 10 44 ns ns p F p F p F HCT UNIT
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