IDT74FCT821B

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


Pinout




Specifications




Description

The IDT74FCT821B series is built using an advanced dual metal CMOS technology.
The IDT74FCT821B 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 IDT74FCT821B 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.