M74HCT646

更新时间： 2024-11-22 23:01:27

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		总线收发器
页数	文件大小	规格书
12页	203K
描述
HCT646 OCTAL BUS TRANSCEIVER/REGISTER 3-STATE HCT648 OCTAL BUS TRANSCEIVER/REGISTER 3-STATE, INV.

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M74HCT646 数据手册

M74HCT646

M74HCT648

HCT646 OCTAL BUS TRANSCEIVER/REGISTER (3-STATE)

HCT648 OCTAL BUS TRANSCEIVER/REGISTER (3-STATE, INV.)

HIGH SPEED

_MAX= 60 MHz (TYP.) AT V_CC= 5 V

LOW POWER DISSIPATION

_CC= 4 µA (MAX.) AT T_A= 25 °C

COMPATIBLE WITH TTL OUTPUTS

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

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 54/74LS646/648

B1R

M1R

(Plastic Package)

(Micro Package)

ORDER CODES :

M74HCTXXXM1R

M74HCTXXXB1R

DESCRIPTION

The M74HCT646/648 are high speed CMOS

OCTAL BUS TRANSCEIVERS AND REGISTERS,

(3-STATE) fabricated in silicon gate C²MOS tech-

nology. They have the same high speed

performance of LSTTL combined with true CMOS

low power consumption. These devices consist of

bus transceiver circuits with 3-state output, D-type

flip-flops, and control circuitry arranged for multi-

plexed transmission of data directly from the input

bus or from the internal registers. Data on the A or

B bus will be clocked into the registers on the low-

to-high transition of the appropriate clock pin (Clock

AB - or Clock BA). Enable (G) and direction (DIR)

pins are provided to control the transceiver function-

s. In the transceiver mode, data present at the

high-impedance port may bestoredin either register

or in both. The select controls (Select AB select BA)

can multiplex stored and real-time (transparent

mode) data. The direction control determines which

bus will receive data when enable G is active (low).

In the isolation mode (enable G high), ”A” data may

be stored in one register and/or ”B” data may be

storedin the other register. When anoutput function

is disabled, the input function is still enabled and

may be used to store and transmit data. Only one

of the two buses, A or B, may be driven at a time.

All inputs are equipped with protection circuits

against static discharge and transient excess volt-

age.This integrated circuit has input and output

characteristics that are fully compatible with 54/74

LSTTL logic families. M74HCT devices are de-

signed 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.

PIN CONNECTIONS (top view)

INPUT AND OUTPUT EQUIVALENT CIRCUIT

GAB, GAB, CAB,

SAB, SBA, CBA

A, B

October 1993

1/12

12 3 4 5 6 7...12

中文翻译

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与M74HCT646相关器件

型号	品牌	获取价格	描述	数据表
M74HCT646B1N	STMICROELECTRONICS	获取价格	暂无描述
M74HCT646B1R	STMICROELECTRONICS	获取价格	HCT646 OCTAL BUS TRANSCEIVER/REGISTER 3-STATE HCT648 OCTAL BUS TRANSCEIVER/REGISTER 3-STAT
M74HCT646M1R	STMICROELECTRONICS	获取价格	HCT646 OCTAL BUS TRANSCEIVER/REGISTER 3-STATE HCT648 OCTAL BUS TRANSCEIVER/REGISTER 3-STAT
M74HCT646RM13TR	STMICROELECTRONICS	获取价格	HCT SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDSO24, SOP-24
M74HCT646TTR	STMICROELECTRONICS	获取价格	暂无描述
M74HCT648	STMICROELECTRONICS	获取价格	HCT646 OCTAL BUS TRANSCEIVER/REGISTER 3-STATE HCT648 OCTAL BUS TRANSCEIVER/REGISTER 3-STAT
M74HCT648B1R	STMICROELECTRONICS	获取价格	HCT646 OCTAL BUS TRANSCEIVER/REGISTER 3-STATE HCT648 OCTAL BUS TRANSCEIVER/REGISTER 3-STAT
M74HCT648F1	STMICROELECTRONICS	获取价格	HCT SERIES, 8-BIT REGISTERED TRANSCEIVER, INVERTED OUTPUT, CDIP24, FRIT SEALED, CERAMIC, D
M74HCT648M1	STMICROELECTRONICS	获取价格	HCT SERIES, 8-BIT REGISTERED TRANSCEIVER, INVERTED OUTPUT, PDSO24, MICRO, PLASTIC, DIP-24
M74HCT648M1R	STMICROELECTRONICS	获取价格	HCT646 OCTAL BUS TRANSCEIVER/REGISTER 3-STATE HCT648 OCTAL BUS TRANSCEIVER/REGISTER 3-STAT

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