Details, datasheet, quote on part number: M54HCT643
PartM54HCT643
CategoryLogic => Bus Exchangers
DescriptionOctal Bus Transceiver3-state: Hct245 Non Inverting Hct640 Inverting, Hct643 Inverting/non Inverting
CompanyST Microelectronics, Inc.
DatasheetDownload M54HCT643 datasheet
  

 

Features, Applications

OCTAL BUS TRANSCEIVER (3-STATE): HCT245 NON INVERTING HCT640 INVERTING, HCT643 INVERTING/NON INVERTING

HIGH SPEED tPD 10 ns (TYP.) at VCC = 5V LOW POWER DISSIPATION o ICC 4 A (MAX.) 25 C COMPATIBLE WITH TTL OUTPUTS VIH = 2V (MIN.) VIL = 0.8V (MAX.) OUTPUT DRIVE CAPABILITY 15 LSTTL LOADS SYMMETRICAL OUTPUT IMPEDANCE |IOH| = IOL 6 mA (MIN) BALANCED PROPAGATION DELAYS tPLH = tPHL PIN AND FUNCTION COMPATIBLE WITH 54/74LS245/640/643

DESCRIPTION The M54/74HCT245, HCT640 and HCT643 utilise silicon gate C2MOS technology to achive operating speeds eqivalent to LSTTL devices. Along with the low power dissipation and high noise immunity of standad CMOS integrated circuit, it possesses the capability to drive 15 LSTTL loads. These IC's are intended for two-way asynchronous communication between data buses, and the direction of data trasmission is determined by DIR input. The enable input (G) can be used to disable the device so that the buses are effectively isolated. All input are equipped with protection circuits against static discharge and transient discharge. These integrated circuits have input and output PIN CONNECTION (top view)

characteristics that are fully compatible with 54/74 LSTTL logic families. M54/74HCT devices are designed to directly interface HSC2MOS systems with TTL and NMOS components. They are also plug in replacements for LSTTL devices giving a reduction of power consumption. IT IS PROHIBITED TO APPLY A SIGNAL TO A BUS TERMINAL WHEN IS IN OUTPUT MODE AND WHEN A BUS THERMINAL IS FLOATING (HIGH IMPEDANCE STATE), IT IS REQUESTED TO FIX THE INPUT LEVEL BY MEANS OF EXTERNAL PULL DOWN OR PULL UP RESISTOR.

Output Enabel Input (Active LOW) Ground (0V) Positive Supply Voltage
NOTE: IN CASE OR HCT643, INPUT INVERTERS MARKED* AT A BUS AND B BUS ARE ELIMINATED RESPECTIVELY

Symbol VCC VI VO IIK IOK IO ICC or IGND PD Tstg TL Supply Voltage DC Input Voltage DC Output Voltage DC Input Diode Current DC Output Diode Current DC Output Source Sink Current Per Output Pin DC VCC or Ground Current Power Dissipation Storage Temperature Lead Temperature (10 sec) Parameter Value -0.5 to VCC -0.5 to VCC +150 300 Unit o C

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition isnotimplied. 500 mW: 65 oC derate 85 oC


 

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