These 10-bit latches feature 3-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. They are particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.
The ten latches are transparent D-type latches. The SN74ALS841 and SN74AS841A have noninverting data (D) inputs. The SN74ALS842 has inverting D inputs.
A buffered output-enable (
) input places the ten outputs in either a normal logic state (high or low logic levels) 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 interface or pullup components.
does not affect the internal operation of the latches. Previously stored data can be retained or new data can be entered while the outputs are off.
The SN74ALS841, SN74AS841A, and SN74ALS842 are characterized for operation from 0°C to 70°C.
| Number of channels | 10 |
| Technology family | ALS |
| Supply voltage (min) (V) | 4.5 |
| Supply voltage (max) (V) | 5.5 |
| Input type | Bipolar |
| Output type | 3-State |
| Clock frequency (max) (MHz) | 75 |
| IOL (max) (mA) | 24 |
| IOH (max) (mA) | -2.6 |
| Supply current (max) (µA) | 62000 |
| Features | Flow-through pinout, High speed (tpd 10-50ns) |
| Operating temperature range (°C) | 0 to 70 |
| Rating | Catalog |
| SOIC (DW) | 24 | 159.65 mm² 15.5 x 10.3 |
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