These 20-bit flip-flops feature 3-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. They are particularly suitable for implementing wider buffer registers, I/O ports, bidirectional bus drivers with parity, and working registers.
The 'ABT16821 can be used as two 10-bit flip-flops or one 20-bit flip-flop. The 20 flip-flops are edge-triggered D-type flip-flops. On the positive transition of the clock (CLK) input, the device provides true data at the Q outputs.
A buffered output-enable () input can be used to place the ten outputs in either a normal logic state (high or low logic level) or a high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines significantly. The high-impedance state and increased drive provide the capability to drive bus lines without need for interface or pullup components.
does not affect the internal operation of the flip-flops. Old data can be retained or new data can be entered while the outputs are in the high-impedance state.
To ensure the high-impedance state during power up or power down, should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
The SN54ABT16821 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ABT16821 is characterized for operation from -40°C to 85°C.
Products containing the "SN74ABT16821" keyword are: SN74ABT16821DGGR , SN74ABT16821DGGRG4 , SN74ABT16821DL , SN74ABT16821DL , SN74ABT16821DLR , SN74ABT16821DLR , SN74ABT16821DLRG4 , SN74ABT16821DLRG4
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Status | ACTIVE |
SubFamily | D-type flip-flop |
Technology Family | ABT |
VCC | 5.5 |
Bits | 20 |
Voltage | 5 |
F @ nom voltage | 150 |
ICC @ nom voltage | 89 |
tpd @ Nom Voltage | 6.1 |
3-state output | Yes |
Rating | Catalog |
Operating temperature range | -40 to 85 |
Package Group | SSOP|56 |
Package size: mm2:W x L (PKG) | [pf]56SSOP[/pf]: 191 mm2: 10.35 x 18.42 (SSOP|56) |
Approx. price | 1.77 | 1ku |