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74ACT11646DW 데이터시트(PDF) 1 Page - Texas Instruments

부품명 74ACT11646DW
상세설명  OCTAL BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS
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G
A1
A2
A3
A4
GND
GND
GND
GND
A5
A6
A7
A8
DIR
CAB
SAB
B1
B2
B3
B4
VCC
VCC
B5
B6
B7
B8
CBA
SBA
DW PACKAGE
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74ACT11646
OCTAL BUS TRANSCEIVER AND REGISTER
WITH 3STATE OUTPUTS
SCAS061A − D2957, JULY 1987 − REVISED APRIL 1993
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 77001
Copyright
1993, Texas Instruments Incorporated
2−1
Independent Registers for A and B Buses
Multiplexed Real-Time and Stored Data
Flow-Through Architecture Optimizes
PCB Layout
Center-Pin V
CC and GND Configurations
Minimize High-Speed Switching Noise
EPICt (Enhanced-Performance Implanted
CMOS) 1-
mm Process
500-mA Typical Latch-Up Immunity at 125°C
description
These devices consist of bus transceiver circuits,
3-state outputs, D-type flip-flops, and control
circuitry arranged for multiplexed transmission of
data directly from the data bus or from the internal
storage 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 (CAB or
CBA). Figure 1 illustrates the four fundamental
bus-management functions that can be performed
with the octal bus transceivers and registers.
Enable (G) and direction (DIR) pins are provided to control the transceiver functions. In the transceiver mode,
data present at the high-impedance port may be stored in either register or in both. The select controls (SAB
and SBA) can multiplex stored and real-time (transparent mode) data. The circuitry used for select control will
eliminate the typical decoding glitch which occurs in a multiplexer during the transition between stored and
real-time data. The direction control determines which bus will receive data when enable G is active (low). In
the isolation mode (control G high), A data may be stored in one register and/or B data may be stored in the
other register.
When an output 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.
The 74ACT11646 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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