CD74HC195 - 高速 CMOS 逻辑 4 位并行存取寄存器

CD74HC195是TI德州仪器公司的一款移位寄存器产品，CD74HC195是高速 CMOS 逻辑 4 位并行存取寄存器，本站介绍了CD74HC195的封装应用图解、特点和优点、功能等，并给出了与CD74HC195相关的TI元器件型号供参考。

CD74HC195 - 高速 CMOS 逻辑 4 位并行存取寄存器 - 移位寄存器 - 触发器/锁存器/寄存器 - 德州仪器

产品描述

The device is useful in a wide variety of shifting, counting and storage applications. It performs serial, parallel, serial to parallel, or parallel to serial data transfers at very high speeds.

The two modes of operation, shift right (Q0-Q1) and parallel load, are controlled by the state of the Parallel Enable (PE)\ input. Serial data enters the first flip-flop (Q0) via the J and K\ inputs when the PE\ input is high, and is shifted one bit in the direction Q0-Q1-Q2-Q3 following each Low to High clock transition. The J and K\ inputs provide the flexibility of the JK-type input for special applications and by tying the two pins together, the simple D-type input for general applications. The device appears as four common-clocked D flip-flops when the PE\ input is Low. After the Low to High clock transition, data on the parallel inputs (D0-D3) is transferred to the respective Q0-Q3 outputs. Shift left operation (Q3-Q2) can be achieved by tying the Qn outputs to the Dn-1 inputs and holding the PE\ input low.

All parallel and serial data transfers are synchronous, occurring after each Low to High clock transition. The ’HC195 series utilizes edge triggering; therefore, there is no restriction on the activity of the J, K\, Pn and PE\ inputs for logic operations, other than set-up and hold time requirements. A Low on the asynchronous Master Reset (MR)\ input sets all Q outputs Low, independent of any other input condition.

产品特性

Asynchronous Master Reset
J, K\,(D) Inputs to First Stage
Fully Synchronous Serial or Parallel Data Transfer
Shift Right and Parallel Load Capability
Complementary Output From Last Stage
Buffered Inputs
Typical fMAX = 50MHz at VCC = 5V, CL = 15pF, TA = 25°C
Fanout (Over Temperature Range)
- Standard Outputs . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . 15 LSTTL Loads
Wide Operating Temperature Range . . . –55°C to 125°C
Balanced Propagation Delay and Transition Times
Significant Power Reduction Compared to LSTTL Logic ICs
HC Types
- 2V to 6V Operation
- High Noise Immunity: NIL = 30%, NIH = 30%of VCC at VCC = 5V

Data sheet acquired from Harris Semiconductor

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