20-bit bus-interface D-type flip-flop; positive-edge trigger;
Rev. 03 — 16 March 2010
Product data sheet
1. General description
The 74ABT16821A high-performance BiCMOS device combines low static and dynamic
power dissipation with high speed and high output drive.
The 74ABT16821A has two 10-bit, edge-triggered registers, with each register coupled to
a 3-state output buffer. The two sections of each register are controlled independently by
the clock (nCP) and output enable (nOE) control gates.
Each register is fully edge triggered. The state of each D input, one set-up time before the
LOW-to-HIGH clock transition, is transferred to the corresponding flip-flops Q output.
The 3-state output buffers are designed to drive heavily loaded 3-state buses, MOS
memories, or MOS microprocessors.
The active-LOW output enable (nOE) controls all ten 3-state buffers independent of the
register operation. When nOE is LOW, the data in the register appears at the outputs.
When nOE is HIGH, the outputs are in high-impedance OFF-state, which means they will
neither drive nor load the bus.
2. Features and benefits
20-bit positive-edge triggered register
Multiple VCC and GND pins minimize switching noise
Live insertion and extraction permitted
Output capability: +64 mA and −32 mA
Latch-up protection exceeds 500 mA per JESD78B class II level A
HBM JESD22-A114F exceeds 2000 V
MM JESD22-A115-A exceeds 200 V