IDT54FCT821A General Description
The IDT54/74FCT800 series is built using an advanced dual metal CMOS technology.
The IDT54/74FCT820 series bus interface registers are designed to eliminate the extra packages required to buffer
existing registers and provide extra data width for wider address/data paths or buses carrying parity. The IDT54/
74FCT821 are buffered, 10-bit wide versions of the popular '374 function. The IDT54/74FCT823 and IDT54/74FCT824 are 9-bit wide buffered registers with Clock Enable (EN) and Clear (CLR) ideal for parity bus interfacing in high-perform- ance microprogrammed systems. The IDT54/74FCT825 are 8-bit buffered registers with all the '823 controls plus multiple enables (OE1, OE2, OE3) to allow multiuser control of the interface, e.g., CS, DMA and RD/WR. They are ideal for use as an output port requiring HIGH IOL/IOH. All of the IDT54/74FCT800 high-performance interface
family are designed for high-capacitance load drive capability, while providing low-capacitance bus loading at both inputs and outputs. All inputs have clamp diodes and all outputs are designed for low-capacitance bus loading in high-impedance state.
IDT54FCT821A Features
• Equivalent to AMD's Am29821-25 bipolar registers in pinout/function, speed and output drive over full temperature and voltage supply extremes
• IDT54/74FCT821A/823A/824A/825A equivalent to FAST speed
• IDT54/74FCT821B/823B/824B/825B 25% faster than FAST
• IDT54/74FCT821C/823C/824C/825C 40% faster than FAST
• Buffered common Clock Enable (EN) and asynchronous Clear input (CLR)
•IOL = 48mA (commercial) and 32mA (military)
• Clamp diodes on all inputs for ringing suppression
• CMOS power levels (1mW typ. static)
• TTL input and output compatibility
• CMOS output level compatible
• Substantially lower input current levels than AMD's bipolar Am29800 series (5µA max.)
• Product available in Radiation Tolerant and Radiation Enhanced versions
• Military product compliant to MIL-STD-883, Class B
IDT54FCT821A Connection Diagram
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