M54HCT643F1

更新时间： 2024-11-02 13:10:07

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		总线驱动器总线收发器逻辑集成电路输出元件
页数	文件大小	规格书
11页	267K
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中文翻译

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数据手册

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M54HCT643F1 数据手册

M54/74HCT245/640/643

OCTAL BUS TRANSCEIVER (3-STATE): HCT245 NON INVERTING

HCT640 INVERTING, HCT643 INVERTING/NON INVERTING

HIGH SPEED

_PD= 10 ns (TYP.) at V_CC= 5V

LOW POWER DISSIPATION

I_CC= 4 µA (MAX.) at T_A= 25 ^oC

COMPATIBLE WITH TTL OUTPUTS

B1R

(Plastic Package)

F1R

_IH= 2V (MIN.) V_IL= 0.8V (MAX.)

(Ceramic Package)

OUTPUT DRIVE CAPABILITY

15 LSTTL LOADS

SYMMETRICAL OUTPUT IMPEDANCE

|I_OH| = I_OL= 6 mA (MIN)

BALANCED PROPAGATION DELAYS

t_PLH= t_PHL

PIN AND FUNCTION COMPATIBLE

WITH 54/74LS245/640/643

M1R

C1R

(Micro Package)

(Chip Carrier)

ORDER CODES :

M54HCTXXXF1R

M74HCTXXXM1R

M74HCTXXXB1R

M74HCTXXXC1R

DESCRIPTION

The M54/74HCT245, HCT640 and HCT643 utilise

silicon gate C²MOS technology to achive operating

speeds eqivalent to LSTTL devices.

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 IT 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.

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)

HCT245

HCT640

HCT643

October 1993

1/11

12 3 4 5 6 7...11

中文翻译

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