SN54173

SN54173, SN54LS173A, SN74173, SN74LS173A 4-BIT D-TYPE REGISTERS WITH 3-STATE OUTPUTS SDLS067A – OCTOBER 1976 – REVISED JUNE 1999 D 3-State Outputs Interface Directly With System Bus D Gated Output-Control LInes for Enabling or Disabling the Outputs D Fully Independent Clock Virtually Eliminates Restrictions for Operating in One of Two Modes: – Parallel Load – Do Nothing (Hold) D For Application as Bus Buffer Registers D Package Options Include Plastic Small-Outline (D) Packages, Ceramic Flat (W) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) DIPs SN54173, SN54LS173A . . . J OR W PACKAGE SN74173 . . . N PACKAGE SN74LS173A . . . D or N PACKAGE (TOP VIEW) M N 1Q 2Q 3Q 4Q CLK GND 1 2 3 4 5 6 7 8 16 VCC 15 CLR 14 1D 13 2D 12 3D 11 4D 10 G2 9 G1 SN54LS173A . . . FK PACKAGE (TOP VIEW) N M NC V CC CLR TYPICAL MAXIMUM TYPE PROPAGATION CLOCK ’173 ’LS173A DELAY TIME 23 ns 18 ns FREQUENCY 35 MHz 50 MHz 3 2 1 20 19 1Q 4 18 1D 2Q 5 17 2D NC 6 16 NC description 3Q 7 15 3D The ’173 and ’LS173A 4-bit registers include 4Q 8 14 4D 9 10 11 12 13 D-type flip-flops featuring totem-pole 3-state CLK GND NC G1 G2 outputs capable of driving highly capacitive or relatively low-impedance loads. The high-impedance third state and increased NC – No internal connection high-logic-level drive provide these flip-flops with the capability of being connected directly to and driving the bus lines in a bus-organized system without need for inter...