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1. General description

The 74ALVT162821 is a 20-bit positive-edge triggered D-type flip-flop with 30 Ω termination

resistors and 3-state outputs

The device can be used as two 10-bit flip-flops or one 20-bit flip-flop. The device features

two clocks (1CP and 2CP) and two output enables (1OE and 2OE), each controlling 10-bits.

The flip-flops will store the state of their individual D-inputs that meet the set-up and hold time

requirements on the LOW-to-HIGH clock (nCP) transition. A HIGH on nOE causes the outputs to

assume a high-impedance OFF-state. Operation of the nOE input does not affect the state of the

flip-flops. Bus hold data inputs eliminate the need for external pull-up resistors to define unused

inputs

2. Features and benefits

? Wide supply voltage range from 2.3 V to 3.6 V

? Overvoltage tolerant inputs to 5.5 V

? BiCMOS high speed and output drive

? Outputs include series resistance of 30 Ω making external termination resistors unnecessary

? No bus current loading when output is tied to 5 V bus

? Direct interface with TTL levels

? IOFF circuitry provides partial Power-down mode operation

? 20-bit positive-edge triggered register

? 5 V I/O compatible

? Multiple VCC and GND pins minimize switching noise

? Bus hold on data inputs

? Live insertion and extraction permitted

? Power-up reset

? Power-up 3-state

? Output capability: +12 mA and -12 mA

? Latch-up protection:

? JESD17: exceeds 500 mA

? ESD protection:

? MIL STD 883, method 3015: exceeds 2000 V

? MM: exceeds 200 V

? Specified from -40 °C to 85 °C