The 'LS673 is a 16-bit shift register and a 16-bit storage register in a single 24-pin package. A three-state input/output (SER/Q15) port to the shift register allows serial entry and/or reading of data. The storage register is connected in a parallel data loop with the shift register and may be asynchronously cleared by taking the store-clear input low. The storage register may be parallel loaded with shift-register data to provide shift-register status via the parallel outputs. The shift register can be parallel loaded with the storage-register data upon commmand.
A high logic level at the chip-level (CS\) input disables both the shift-register clock and the storage register clock and places SER/Q15 in the high-impedance state. The store-clear function is not disabled by the chip select.
Caution must be exercised to prevent false clocking of either the shift register or the storage register via the chip-select input. The shift clock should be low during the low-to-high transition of chip select and the store clock should be low during the high-to-low transition of chip select.
The 'LS674 is a 16-bit parallel-in, serial-out shift register. A three-state input/output (SER/Q15) port provides access for entering a serial data or reading the shift-register word in a recirculating loop.
The device has four basic modes of operation:
Low-to-high-level changes at the chip select input should be made only when the clock input is low to prevent false clocking.
|VCC (Min) (V)|
|VCC (Max) (V)|
|Voltage (Nom) (V)|
|F @ Nom Voltage (Max) (Mhz)|
|ICC @ Nom Voltage (Max) (mA)|
|tpd @ Nom Voltage (Max) (ns)|
|Output Drive (IOL/IOH) (Max) (mA)|
|Operating Temperature Range (C)|
|0 to 70||-55 to 125|
|24SOIC|| 24CDIP |
|Samples Not Available||Samples Not Available|
|Military||SN54LS674||QML certified for Military and Defense Applications|