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參數資料
| 型號： | SN54HC646FK |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | CONV DC-DC 120W 48VIN 3.3V SMD |
| 中文描述： | 八路總線收發器和寄存器具有三態輸出 |
| 文件頁數： | 1/10頁 |
| 文件大?。?/td> | 175K |
| 代理商： | SN54HC646FK |
SN54HC646, SN74HC646
OCTAL BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCLS150B – DECEMBER 1982 – REVISED MAY 1997
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Independent Registers for A and B Buses
Multiplexed Real-Time and Stored Data
True Data Paths
High-Current 3-State Outputs Can Drive up
to 15 LSTTL Loads
Package Options Include Plastic
Small-Outline (DW) and Ceramic Flat (W)
Packages, Ceramic Chip Carriers (FK), and
Standard Plastic (NT) and Ceramic (JT)
300-mil DIPs
description
The ’HC646 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 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 ’HC646.
Output-enable (OE) and direction-control (DIR)
inputs control the transceiver functions. In the
transceiver
mode,
data
high-impedance port may be stored in either or
both registers.
present
at
the
The select-control (SAB and SBA) inputs can
multiplex stored and real-time (transparent mode)
data. DIR determines which bus receives 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 can be used to store and transmit
data. Only one of the two buses, A or B, may be driven at a time.
The SN54HC646 is characterized for operation over the full military temperature range of –55
°
C to 125
°
C. The
SN74HC646 is characterized for operation from –40
°
C to 85
°
C.
Copyright
1997, 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.
parameters.
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.
14 15 16 17
SN54HC646 . . . JT OR W PACKAGE
SN74HC646 . . . DW OR NT PACKAGE
(TOP VIEW)
SN54HC646 . . . FK PACKAGE
(TOP VIEW)
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
18
17
16
15
14
13
5
6
7
8
9
10
11
25
24
23
22
21
20
19
4
3
2 1 28
12 13
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
18
27 26
NC – No internal connection
相關PDF資料 |
PDF描述 |
|---|---|
| SN54HC646 | 3-44V Single Channel Operational Amplifier, Ta = 0 to +70°C - Pb-free; Package: SOIC-8 Narrow Body; No of Pins: 8; Container: Tape and Reel; Qty per Container: 2500 |
| SN54HC646JT | 3-44V Single Channel Operational Amplifier, Ta = 0 to +70°C; Package: 8 LEAD PDIP; No of Pins: 8; Container: Rail; Qty per Container: 50 |
| SN54HC646W | 3-44V Single Channel Operational Amplifier, Ta = 0 to +70°C - Pb-free; Package: 8 LEAD PDIP; No of Pins: 8; Container: Rail; Qty per Container: 50 |
| SN54HC652 | 3-44V Dual Channel Operational Amplifier with 3mV VIO, Ta = 0 to +70°C; Package: SOIC-8 Narrow Body; No of Pins: 8; Container: Rail; Qty per Container: 98 |
| SN54HC652FK | 3-44V Dual Channel Operational Amplifier with 3mV VIO, Ta = 0 to +70°C - Pb-free; Package: SOIC-8 Narrow Body; No of Pins: 8; Container: Rail; Qty per Container: 98 |
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