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| 型號(hào)： | SN54ALS648FK |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS |
| 中文描述： | 八路總線收發(fā)器和寄存器具有三態(tài)輸出 |
| 文件頁數(shù)： | 1/18頁 |
| 文件大?。?/td> | 270K |
| 代理商： | SN54ALS648FK |
5
6
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11
25
24
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4
3
2 1 28
12 13 14 15 16
OE
B1
B2
NC
B3
B4
B5
A1
A2
A3
NC
A4
A5
A6
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
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SN54ALS646, SN54ALS648, SN54AS646 . . . JT PACKAGE
SN74ALS646A, SN74ALS648A, SN74AS646,
SN74AS648 . . . DW OR NT PACKAGE
(TOP VIEW)
SN54ALS646, SN54ALS648, SN54AS646 . . . FK PACKAGE
(TOP VIEW)
SN54ALS646, SN54ALS648, SN54AS646
SN74ALS646A, SN74ALS648A, SN74AS646, SN74AS648
OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS
SDAS039F – DECEMBER 1983 – REVISED JANUARY 1995
Copyright
1995, Texas Instruments Incorporated
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Independent Registers for A and B Buses
Multiplexed Real-Time and Stored Data
Choice of True or Inverting Data Paths
Choice of 3-State or Open-Collector
Outputs
Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK), and Standard Plastic
(NT) and Ceramic (JT) 300-mil DIPs
DEVICE
OUTPUT
LOGIC
SN54ALS646, SN74ALS646A,
′
AS646
SN54ALS648, SN74ALS648A, SN74AS648
3 state
True
3 state
Inverting
description
These devices consist of bus-transceiver circuits
with 3-state or open-collector 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 is 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 octal bus
transceivers and registers.
Output-enable (OE) and direction-control (DIR)
inputs control the transceiver functions. In the
transceiver mode, data present at the high-
impedance port may be stored in either or both
registers.
The select-control (SAB and SBA) inputs can
multiplex stored and real-time (transparent mode)
data. The circuitry used for select control eliminates the typical decoding glitch that occurs in a multiplexer during
the transition between stored and real-time data. DIR determines which bus receives data when OE is 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 can be used to store and transmit
data. Only one of the two buses, A or B, may be driven at a time.
The -1 version of the SN74ALS646A is identical to the standard version, except that the recommended
maximum I
OL
in the -1 version is increased to 48 mA. There are no -1 versions of the SN54ALS646,
SN54ALS648, or SN74ALS648A.
The SN54ALS646, SN54ALS648, and SN54AS646 are characterized for operation over the full military
temperature range of –55
°
C to 125
°
C. The SN74ALS646A, SN74ALS648A, SN74AS646, and SN74AS648 are
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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