Pinout
SpecificationsSupply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 V
Input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 V
Voltage applied to a disabled 3-state output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5.5 V
Operating free-air temperature range:
SN54ALS841, SN54AS841, SN54ALS842, SN54AS842 . . . . . . . . . . . . . . . . . 55°C to 125°C
SN74ALS841, SN74AS841, SN74ALS842, SN74AS842 . . . . . . . . . .. . . . . . . . . . .0°C to 70°C
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150°CDescriptionThese 10-bit latches of SN54ALS841, SN54AS841, SN54ALS842, and SN54AS842 feature 3-state outputs designed specifically for driving highly-capacitive or relatively low-impedance loads. SN54ALS841, SN54AS841, SN54ALS842, and SN54AS842 are particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.
The ten latches are transparent D-type. The 'ALS841 and 'AS841 have noninverting data (D) inputs. The 'ALS842 and 'AS842 have inverting D inputs.
A buffered output control (OC) input of SN54ALS841, SN54AS841, SN54ALS842, and SN54AS842 can be used to place the ten outputs in either a normal logic state (high or low 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 the bus lines of SN54ALS841, SN54AS841, SN54ALS842, and SN54AS842 in a bus-organized system without need for interface or pullup components.
The output control does not affect the internal operation of the latches. Old data of SN54ALS841, SN54AS841, SN54ALS842, and SN54AS842 can be retained or new data can be entered while the outputs are off.
The -1 versions of the SN74ALS841 and SN74ALS842 parts are identical to the standard versions except that the recommended maximum IOL is increased to 48 mA. There are no -1 versions of the SN54ALS841 and SN54ALS842.
The SN54ALS841, SN54AS841, SN54ALS842, and SN54AS842 are characterized for operation over the full military temperature range of 55°C to 125°C. The SN74ALS841, SN74AS841, SN74ALS842, and SN74AS842 are characterized for operation from 0°C to 70°C.
SN54AS841 Data Sheet
