The TC74VCX16821FT is a high-performance CMOS 20-bit
D-type flip-flop. Designed for use in 1.8-V, 2.5-V or 3.3-V systems,
it achieves high-speed operation while maintaining the CMOS
low power dissipation.
It is also designed with overvoltage tolerant inputs and outputs
up to 3.6 V.
The device is byte controlled with each byte functioning
identically, but independent of the other. Control pins can be
shorted together to obtain full 20-bit operation. The following
description applies to each byte. The twenty flip-flops will store
the state of their individual D inputs that meet the setup and
hold time requirements on the LOW-to-HIGH Clock (CK)
transition. When the OE input is high, the outputs are in a high-impedance state. This device is designed to be
used with 3-state memory address drivers, etc.
All inputs are equipped with protection circuits against static discharge.

Features
• Low-voltage operation: VCC = 1.8 to 3.6 V
• High-speed operation : tpd = 3.5 ns (max) (VCC = 3.0 to 3.6 V)
: tpd = 4.4 ns (max) (VCC = 2.3 to 2.7 V)
: tpd = 8.8 ns (max) (VCC = 1.8 V)
• Output current : IOH/IOL = ±24 mA (min) (VCC = 3.0 V)
: IOH/IOL = ±18 mA (min) (VCC = 2.3 V)
: IOH/IOL = ±6 mA (min) (VCC = 1.8 V)
• Latch-up performance: −300 mA
• ESD performance: Machine model ≥ ±200 V
Human body model ≥ ±2000 V
• Package: TSSOP
• 3.6-V tolerant function and power-down protection provided on all inputs and outputs