These 8-bit registers feature 3-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. The high-impedance 3-state and increased high-logic-level drive provide these registers with the capability of being connected directly to and driving the bus lines in a bus-organized system without need for interface or pullup components. These devices are particularly attractive for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.
The eight latches of the LS373 and S373 are transparent D-type latches, meaning that while the enable (C or CLK) input is high, the Q outputs follow the data (D) inputs. When C or CLK is taken low, the output is latched at the level of the data that was set up.
The eight flip-flops of the LS374 and S374 are edge-triggered D-type flip-flops. On the positive transition of the clock, the Q outputs are set to the logic states that were set up at the D inputs.
Schmitt-trigger buffered inputs at the enable/clock lines of the S373 and S374 devices simplify system design as ac and dc noise rejection is improved by typically 400 mV due to the input hysteresis. A buffered output-control (OC) input can be used to place the eight outputs in either a normal logic state (high or low logic levels) or the high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines significantly.
OC\ does not affect the internal operation of the latches or flip-flops. That is, the old data can be retained or new data can be entered, even while the outputs are off.
Products containing the "SN74LS374" keyword are: SN74LS374DBR , SN74LS374DBR , SN74LS374DBRG4 , SN74LS374DW , SN74LS374DW , SN74LS374DW2 , SN74LS374DWG4 , SN74LS374DWR , SN74LS374DWR , SN74LS374DWR2 , SN74LS374DWRG4 , SN74LS374DWRG4 , SN74LS374DWRSN74LS373DWR , SN74LS374JD , SN74LS374MC1 , SN74LS374MR1 , SN74LS374N , SN74LS374N , SN74LS374ND , SN74LS374NE4Status | ACTIVE |
SubFamily | D-type flip-flop |
Technology Family | LS |
VCC | 5.25 |
Bits | 8 |
Voltage | 5 |
F @ nom voltage | 35 |
ICC @ nom voltage | 40 |
tpd @ Nom Voltage | 28 |
3-state output | Yes |
Rating | Catalog |
Operating temperature range | 0 to 70 |
Package Group | PDIP|20 |
Package size: mm2:W x L (PKG) | See datasheet (PDIP) |
Approx. price | 0.28 | 1ku |