IDT74FCT646ATQ

快速CMOS八路收发器/寄存器（三态） FAST CMOS OCTAL TRANSCEIVER/ REGISTERS 3-STATE

DESCRIPTION:

The FCT646T consists of a bus transceiver with 3-state D-type flip-flops and control circuitry arranged for multiplexed transmission of data directly from the data bus or from the internal storage registers. The FCT646T utilizes the enable control G and direction DIR pins to control the transceiver functions.

SAB and SBA control pins are provided to select either real- time or stored data transfer. The circuitry used for select control will eliminate the typical decoding glitch that occurs in a multiplexer during the transition between stored and real-time data. A low input level selects real-time data and a high selects stored data.

Data on the A or B data bus, or both, can be stored in the internal D flip flops by low-to-high transitions at the appropriate clock pins CPAB or CPBA, regardless of the select or enable control pins.

FEATURES:

• Std., A, and C grades

• Low input and output leakage ≤1µA max.

• CMOS power levels

• True TTL input and output compatibility:

   – VOH = 3.3V typ.

   – VOL = 0.3V typ.

• High Drive outputs -15mA IOH, 64mA IOL

• Meets or exceeds JEDEC standard 18 specifications

• Military product compliant to MIL-STD-883, Class B and DESC listed dual marked

• Power off disable outputs permit "live insertion"

• Available in the following packages:

   – Industrial: SOIC, SSOP, QSOP, TSSOP

   – Military: CERDIP, LCC