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74ACT11657DWR Datasheet(PDF) 1 Page - Texas Instruments

No. de pieza 74ACT11657DWR
Descripción Electrónicos  OCTAL TRANSCEIVER WITH PARITY GENERATOR/CHECKER AND 3-STATE OUTPUTS
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Fabricante Electrónico  TI1 [Texas Instruments]
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74ACT11657DWR Datasheet(HTML) 1 Page - Texas Instruments

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74ACT11657
OCTAL TRANSCEIVER WITH PARITY GENERATOR/CHECKER
AND 3STATE OUTPUTS
SCAS232 − AUGUST 1992 − REVISED APRIL 1993
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 77001
Copyright
1993, Texas Instruments Incorporated
2−1
Inputs Are TTL-Voltage Compatible
Flow-Through Architecture Optimizes
PCB Layout
Center-Pin V
CC and GND Pin
Configurations Minimize High-Speed
Switching Noise
EPIC (Enhanced-Performance Implanted
CMOS) 1-
µm Process
500-mA Typical Latch-Up Immunity
at 125
°C
Package Options Include Plastic
Small-Outline Packages and Standard
Plastic 300-mil DIPs
description
The 74ACT11657 contains eight noninverting
buffers with 3-state outputs and an 8-bit parity
generator/checker and is intended for bus-
oriented applications.
The transmit/receive (T/R) input determines the direction of data flow through the bidirectional transceivers.
When T/R is high, data flows from the A port to the B port (transmit mode); 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.
Odd or even parity is selected by a logic high or low level, respectively, on the ODD/EVEN input. PARITY carries
the parity bit value; it is an output from the parity generator/checker in the transmit mode and an input to the parity
generator/checker in the receive mode.
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 the ODD/EVEN input. For example, if ODD/EVEN
is low (even parity selected) and there are five high bits on the A bus, then 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 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, then ERR is low,
indicating a parity error.
The 74ACT11657 is characterized for operation from − 40
°C to 85°C.
PRODUCTION DATA information is 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.
EPIC is a trademark of Texas Instruments Incorporated.
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PARITY
A1
A2
A3
A4
GND
GND
GND
GND
A5
A6
A7
A8
ERR
OE
B1
B2
B3
B4
VCC
VCC
VCC
B5
B6
B7
B8
ODD/EVEN
T/R
DW PACKAGE
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