SN74ABT657A

更新时间： 2024-09-23 23:06:11

品牌	Logo	应用领域
德州仪器 - TI		输出元件
页数	文件大小	规格书
9页	161K
描述
OCTAL TRANSCEIVERS WITH PARITY GENERATORS/CHECKERS AND 3-STATE OUTPUTS

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SN74ABT657A 数据手册

SN54ABT657A, SN74ABT657A

OCTAL TRANSCEIVERS WITH PARITY GENERATORS/CHECKERS

AND 3-STATE OUTPUTS

SCBS192E – JANUARY 1991 – REVISED JUNE 1997

SN54ABT657A . . . JT PACKAGE

SN74ABT657A . . . DW OR NT PACKAGE

(TOP VIEW)

State-of-the-Art EPIC-ΙΙB BiCMOS Design

Significantly Reduces Power Dissipation

ESD Protection Exceeds 2000 V Per

MIL-STD-883, Method 3015; Exceeds 200 V

Using Machine Model (C = 200 pF, R = 0)

T/R

GND

Latch-Up Performance Exceeds 500 mA Per

JEDEC Standard JESD-17

Typical V

(Output Ground Bounce) < 1 V

OLP

at V

= 5 V, T = 25°C

High-Impedance State During Power Up

and Power Down

Flow-Through Architecture Optimizes PCB

Layout

A8 10

15 B7

ODD/EVEN

ERR

PARITY

High-Drive Outputs (–32-mA I , 64-mA I

)

Package Options Include Plastic

Small-Outline (DW) Packages, Ceramic

Chip Carriers (FK), and Plastic (NT) and

Ceramic (JT) DIPs

SN54ABT657A . . . FK PACKAGE

(TOP VIEW)

description

28 27 26

ABT657A transceivers have eight

ODD/EVEN

ERR

PARITY

T/R

noninverting buffers with parity-generator/

checker circuits and control signals. The

transmit/receive (T/R) input determines the

direction of data flow. When T/R is high, data flows

fromtheAporttotheBport(transmitmode);when

T/R is low, data flows from the B port to the A port

(receive mode). When the output-enable (OE)

input is high, both the A and B ports are in the

high-impedance state.

12 13 14 15 16 17 18

Odd or even parity is selected by a logic high or

low level on the ODD/EVEN input. PARITYcarries

the parity-bit value; it is an output from the parity

generator/checker in the transmit mode and an

inputtotheparitygenerator/checkerinthereceive

mode.

NC – No internal connection

In the transmit mode, after the A bus is polled to determine the number of high bits, PARITY is set to the logic

level that maintains the parity sense selected by the level at ODD/EVEN. For example, if ODD/EVEN is low

(even parity selected) and there are five high bits on the A bus, PARITY is set to the logic high level so that an

even number of the nine total bits (eight A-bus bits plus parity bit) are high.

In the receive mode, after the B bus is polled to determine the number of high bits, the error (ERR) output logic

level indicates whether or not the data to be received exhibits the correct parity sense. For example, if

ODD/EVEN is high (odd parity selected), PARITY is high, and there are three high bits on the B bus, ERR is

low, indicating a parity error.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

EPIC-ΙΙB is a trademark of Texas Instruments Incorporated.

UNLESS OTHERWISE NOTED this document contains PRODUCTION

DATA information current as of publication date. Products conform to

specifications per the terms of Texas Instruments standard warranty.

Production processing does not necessarily include testing of all

parameters.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

12 3 4 5 6 7...9

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与SN74ABT657A相关器件

型号	品牌	获取价格	描述	数据表
SN74ABT657ADBR	TI	获取价格	具有奇偶校验发生器/校验器和三态输出的八路收发器 \| DB \| 24 \| -40 to 8
SN74ABT657ADW	TI	获取价格	OCTAL TRANSCEIVERS WITH PARITY GENERATORS/CHECKERS AND 3-STATE OUTPUTS
SN74ABT657ADWR	TI	获取价格	Octal Transceivers With Parity Generators/Checkers And 3-State Outputs 24-SOIC -40 to 85
SN74ABT657ADWRE4	TI	获取价格	Octal Transceivers With Parity Generators/Checkers And 3-State Outputs 24-SOIC -40 to 85
SN74ABT657ADWRG4	TI	获取价格	ABT SERIES, 8-BIT TRANSCEIVER, TRUE OUTPUT, PDSO24, GREEN, PLASTIC, SOIC-24
SN74ABT657ANSRE4	TI	获取价格	ABT SERIES, 8-BIT TRANSCEIVER, TRUE OUTPUT, PDSO24, GREEN, SOP-24
SN74ABT657ANSRG4	TI	获取价格	ABT SERIES, 8-BIT TRANSCEIVER, TRUE OUTPUT, PDSO24, GREEN, SOP-24
SN74ABT657ANT	TI	获取价格	OCTAL TRANSCEIVERS WITH PARITY GENERATORS/CHECKERS AND 3-STATE OUTPUTS
SN74ABT657ANTE4	TI	获取价格	ABT SERIES, 8-BIT TRANSCEIVER, TRUE OUTPUT, PDIP24, ROHS COMPLIANT, PLASTIC, DIP-24
SN74ABT657DBLE	TI	获取价格	ABT SERIES, 8-BIT TRANSCEIVER, TRUE OUTPUT, PDSO24

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