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