DESCRIPTION

The M54/74HC299/323 are high speed CMOS 8-BIT PIPO SHIFT REGISTERS (3-STATE) fabri cated with silicon gate C2MOS technology.

They achieve the high speed operation similar to equivalent LSTTL while maintaining the CMOS low power consumption.

These devices have four modes (HOLD, SHIFT LEFT,SHIFT RIGHTand LOADDATA). Each mode is chosen by two function select inputs (S0, S1).

When one or both enable inputs, (G1, G2) are high, the eight input/output terminals are in the high impedance state ; however sequential operation or clearing of the register is not affected.

Clear function on the HC299 is asynchronous to CLOCK, while the HC323 is cleared synchronous to clock.

All inputs are equipped with protection circuits against static discharge and transient excess volt age.

■ HIGH SPEED

fMAX = 42 MHz (TYP.) AT VCC = 5V

■ LOW POWER DISSIPATION

ICC = 4 µA (MAX.) AT TA = 25 °C

■ HIGH NOISE IMMUNITY

VNIH = VNIL = 28 VCC (MIN.)

■ OUTPUT DRIVE CAPABILITY

10 LSTTL LOADS FOR QA’ TO QH’

15 LSTTL LOADS FOR QA TO QH

■ SYMMETRICAL OUTPUT IMPEDANCE

|IOH| = IOL = 6 mA (MIN.) FOR QA, TO QH,

|IOH| = IOL = 4 mA (MIN.) FOR QA, TO QH

■ BALANCED PROPAGATION DELAYS

tPLH = tPHL

■ WIDE OPERATING VOLTAGE RANGE

VCC (OPR) = 2 V TO 6 V

■ PIN AND FUNCTION COMPATIBLE WITH 54/74LS299

M74HC299B1R属于集成电路（IC） > 通用总线功能。意法半导体（ST）集团制造生产的M74HC299B1R通用总线功能通用总线功能系列产品是元件级产品，用于处理或操作一系列（通常为 8 个或更多）并行逻辑信号（称为总线）。所执行的功能包括临时存储要发送或接收的数据，执行缓冲以允许输出电流容量有限的器件（例如微处理器）通过远距离互连高速传输数据，以及调换或移动总线内的位顺序等。