SN74F299

ą The SN54F299 is obsolete and no longer supplied. SN54F299, SN74F299 8ĆBIT UNIVERSAL SHIFT/STORAGE REGISTERS WITH 3ĆSTATE OUTPUTSą SDFS071B − MARCH 1987 − REVISED APRIL 2004 D Four Modes of Operation: − Hold (Store) − Shift Right − Shift Left − Load Data D Operates With Outputs Enabled or at High Impedance D 3-State Outputs Drive Bus Lines Directly D Can Be Cascaded for N-Bit Word Lengths D Direct Overriding Clear D Applications: − Stacked or Pushdown Registers − Buffer Storage − Accumulator Registers description/ordering information SN54F299 . . . J PACKAGE SN74F299 . . . DW, N, OR NS PACKAGE (TOP VIEW) S0 1 OE1 2 OE2 3 G/QG 4 E/QE 5 C/QC 6 A/QA 7 QA′ 8 CLR 9 GND 10 20 VCC 19 S1 18 SL 17 QH′ 16 H/QH 15 F/QF 14 D/QD 13 B/QB 12 CLK 11 SR SN54F299 . . . FK PACKAGE (TOP VIEW) OE2 OE1 S0 VCC S1 These 8-bit universal shift /storage registers feature multiplexed I/O ports to achieve full 8-bit data handling in a single 20-pin package. Two function-select (S0, S1) inputs and two output-enable (OE1, OE2) inputs can be used to choose the modes of operation listed in the function table. Synchronous parallel loading is accomplished by G/QG E/QE C/QC A/QA QA′ 3 2 1 20 19 4 18 5 17 6 16 7 15 8 14 9 10 11 12 13 SL QH′ H/QH F/QF D/QD taking both S0 and S1 high. This places the CLR GND SR CLK B/QB 3-state outputs in a high-impedance state and permits data that is applied on the I/O ports to be clocked into the register. Reading out of the register can be accompl...