參數(shù)資料
型號： SN54BCT648
廠商： Texas Instruments, Inc.
英文描述： Octal Bus Transceivers/Registers With 3-State Outputs(八總線收發(fā)器/寄存器(三態(tài)輸出))
中文描述： 八路總線收發(fā)器/寄存器與3態(tài)輸出（八總線收發(fā)器/寄存器（三態(tài)輸出））
文件頁數(shù)： 1/8頁
文件大?。?/td> 168K
代理商： SN54BCT648
SN54BCT648 . . . JT OR W PACKAGE
SN74BCT648 . . . DW OR NT PACKAGE
(TOP VIEW)
5
6
7
8
9
10
11
25
24
23
22
21
20
19
4
3
2
1 28
12 13 14 15 16
OE
B1
B2
NC
B3
B4
B5
A1
A2
A3
NC
A4
A5
A6
SN54BCT648 . . . FK PACKAGE
(TOP VIEW)
D
S
C
B
B
A
G
N
N
C
S
V
A
B
17 18
27 26
NC – No internal connection
C
CLKAB
SAB
DIR
A1
A2
A3
A4
A5
A6
A7
A8
GND
V
CC
CLKBA
SBA
OE
B1
B2
B3
B4
B5
B6
B7
B8
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
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13
SN54BCT648, SN74BCT648
OCTAL BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCBS050B – MAY 1990 – REVISED APRIL 1994
Copyright
1994, Texas Instruments Incorporated
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
State-of-the-Art BiCMOS Design
Significantly Reduces I
CCZ
Independent Registers for A and B Buses
Multiplexed Real-Time and Stored Data
Inverting Data Paths
Power-Up High-Impedance Mode
Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK) and Flatpacks (W), and
Standard Plastic and Ceramic 300-mil DIPS
(JT, NT)
description
These devices consist of bus transceiver circuits
with 3-state outputs, D-type flip-flops, and control
circuitry arranged for multiplexed 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 (CLKAB or CLKBA) input.
Figure 1 illustrates the four fundamental bus-
management functions that can be performed with
the
′
BCT648.
Output-enable (OE) and direction-control (DIR)
inputs 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 control (SAB and
SBA) can multiplex stored and real-time
(transparent mode) data. The direction control
determines which bus will receive data when OE
is active (low). In the isolation mode (OE 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 SN54BCT648 is characterized for operation over the full military temperature range of –55
°
C to 125
°
C. The
SN74BCT648 is characterized for operation from 0
°
C to 70
°
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.
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