SN54HCT646WR [TI]
HCT SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, CDFP24, CERAMIC, FP-24;
| 型号： | SN54HCT646WR |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | HCT SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, CDFP24, CERAMIC, FP-24 CD 输出元件 逻辑集成电路 |
| 文件： | 总13页 (文件大小：312K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN54HCT646, SN74HCT646
OCTAL BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCLS178C – MARCH 1984 – REVISED MARCH 2003
Operating Voltage Range of 4.5 V to 5.5 V
Low Power Consumption, 80-µA Max I
Independent Registers for A and B Buses
Multiplexed Real-Time and Stored Data
True Data Paths
CC
Typical t = 12 ns
pd
±6-mA Output Drive at 5 V
High-Current 3-State Outputs Can Drive Up
To 15 LSTTL Loads
Low Input Current of 1 µA Max
Inputs Are TTL-Voltage Compatible
SN54HCT646 . . . JT OR W PACKAGE
SN74HCT646 . . . DW OR NT PACKAGE
(TOP VIEW)
SN54HCT646 . . . FK PACKAGE
(TOP VIEW)
1
24
23
22
21
20
19
18
17
16
15
14
13
CLKAB
SAB
DIR
A1
A2
A3
A4
A5
A6
A7
A8
GND
V
CC
2
CLKBA
SBA
OE
B1
B2
B3
B4
B5
B6
B7
3
4
3
2
1
28 27 26
25
A1
A2
A3
NC
A4
OE
B1
B2
NC
B3
B4
B5
5
6
7
8
9
4
24
23
22
21
20
19
5
6
7
8
A5 10
11
9
A6
10
11
12
12 13 14 15 16 17 18
B8
NC – No internal connection
description/ordering information
The ’HCT646 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 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 ’HCT646 devices.
Output-enable (OE) and direction-control (DIR) inputs control the transceiver functions. In the transceiver
mode, data present at the high-impedance port can be stored in either or both registers.
ORDERING INFORMATION
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
†
PACKAGE
T
A
PDIP – NT
SOIC – DW
Tube
SN74HCT646NT
SN74HCT646DW
SN74HCT646DWR
SNJ54HCT646JT
SNJ54HCT646W
SNJ54HCT646FK
SN74HCT646NT
–40°C to 85°C
–55°C to 125°C
Tube
HCT646
Tape and reel
Tube
CDIP – JT
CFP – W
SNJ54HCT646JT
SNJ54HCT646W
SNJ54HCT646FK
Tube
LCCC – FK
Tube
†
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
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.
Copyright 2003, 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.
Production processing does not necessarily include testing of all
parameters.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54HCT646, SN74HCT646
OCTAL BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCLS178C – MARCH 1984 – REVISED MARCH 2003
description/ordering information (continued)
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 can be
stored in one register and/or B data can be stored in the other register.
When an output function is disabled, the input function still is enabled and can be used to store data. Only one
of the two buses, A or B, can be driven at a time.
To ensure the high-impedance state during power up or power down, OE should be tied to V through a pullup
CC
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
FUNCTION TABLE
INPUTS
DATA I/O
OPERATION OR FUNCTION
DIR
X
CLKAB
CLKBA
SAB
X
SBA
X
A1–A8
Input
B1–B8
OE
X
X
H
H
L
†
†
†
↑
X
Unspecified
Store A, B unspecified
Store B, A unspecified
Store A and B data
†
X
X
↑
X
X
Unspecified
Input
Input
X
↑
H or L
X
↑
H or L
X
X
X
Input
X
X
X
Input disabled
Output
Input disabled
Input
Isolation, hold storage
Real-time B data to A bus
Stored B data to A bus
Real-time A data to B bus
Stored A data to B bus
L
X
L
L
L
X
H or L
X
X
H
Output
Input
L
H
H
X
L
X
Input
Output
L
H or L
X
H
X
Input
Output
†
The data-output functions can be enabled or disabled by various signals at OE and DIR. Data-input functions always are enabled; i.e., data at
the bus terminals is stored on every low-to-high transition of the clock inputs.
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54HCT646, SN74HCT646
OCTAL BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCLS178C – MARCH 1984 – REVISED MARCH 2003
21
3
1
23
2
22
SBA
L
21
3
DIR
H
1
23
CLKAB CLKBA SAB
L
2
22
SBA
X
DIR CLKAB CLKBA SAB
L
OE
L
OE
L
X
X
X
X
X
REAL-TIME TRANSFER
BUS B TO BUS A
REAL-TIME TRANSFER
BUS A TO BUS B
21
3
1
23
2
22
21
OE
L
3
DIR
L
1
23
2
22
SBA
H
DIR CLKAB CLKBA SAB
SBA
X
CLKAB CLKBA SAB
OE
X
X
X
X
X
↑
X
X
X
↑
X
X
H or L
X
X
H
X
H
X
X
L
H
H or L
X
↑
↑
STORAGE FROM
A, B, OR A AND B
TRANSFER STORED DATA
TO A AND/OR B
Pin numbers shown are for the DW, JT, NT, and W packages.
Figure 1. Bus-Management Functions
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54HCT646, SN74HCT646
OCTAL BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCLS178C – MARCH 1984 – REVISED MARCH 2003
logic diagram (positive logic)
21
OE
3
DIR
23
CLKBA
22
SBA
1
CLKAB
2
SAB
One of Eight Channels
1D
C1
4
A1
20
B1
1D
C1
To Seven Other Channels
Pin numbers shown are for the DW, JT, NT, and W packages.
†
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V
CC
I
Input clamp current, I (V < 0 or V > V ) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
IK
I
CC
Output clamp current, I
(V < 0 or V > V ) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
OK
O O CC
Continuous output current, I (V = 0 to V ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±35 mA
Continuous current through V
Package thermal impedance, θ (see Note 2): DW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46°C/W
O
O
CC
CC
or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±70 mA
JA
(see Note 3): NT package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67°C/W
Storage temperature range, T
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
stg
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. The package thermal impedance is calculated in accordance with JESD 51-7.
3. The package thermal impedance is calculated in accordance with JESD 51-3.
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54HCT646, SN74HCT646
OCTAL BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCLS178C – MARCH 1984 – REVISED MARCH 2003
recommended operating conditions (see Note 4)
SN54HCT646
MIN NOM MAX
SN74HCT646
MIN NOM MAX
UNIT
V
V
V
V
V
Supply voltage
4.5
2
5
5.5
4.5
2
5
5.5
V
V
CC
IH
IL
I
High-level input voltage
Low-level input voltage
Input voltage
V
V
= 4.5 V to 5.5 V
= 4.5 V to 5.5 V
CC
0.8
0.8
V
CC
0
0
V
V
0
0
V
V
V
CC
CC
Output voltage
V
O
CC
CC
t
Input transition (rise and fall) time
Operating free-air temperature
500
125
500
85
ns
°C
t
T
–55
–40
A
NOTE 4: All unused inputs of the device must be held at V
or GND to ensure proper device operation. Refer to the TI application report,
CC
Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
T
= 25°C
SN54HCT646 SN74HCT646
A
PARAMETER
TEST CONDITIONS
V
UNIT
V
CC
MIN
TYP
MAX
MIN
4.4
MAX
MIN
4.4
MAX
I
I
I
I
= –20 µA
= –6 mA
= 20 µA
= 6 mA
4.4 4.499
OH
OH
OL
OL
V
V
V = V or V
IH
4.5 V
4.5 V
OH
I
IL
3.98
4.3
0.001
0.17
3.7
3.84
0.1
0.26
±100
±0.5
8
0.1
0.4
0.1
0.33
±1000
±5
V = V or V
V
OL
I
IH
IL
I
I
I
Control inputs V = V
or 0
5.5 V
5.5 V
5.5 V
±0.1
±1000
±10
nA
µA
µA
I
I
CC
A or B
V
O
= V or 0
CC
±0.01
OZ
CC
V = V
I
or 0,
I
O
= 0
160
80
CC
One input at 0.5 V or 2.4 V,
Other inputs at 0 or V
†
5.5 V
1.4
3
2.4
10
3
2.9
10
mA
pF
∆I
CC
CC
4.5 V
to 5.5 V
C
Control inputs
10
i
†
This is the increase in supply current for each input that is at one of the specified TTL voltage levels, rather than 0 V or V
CC
.
timing requirements over recommended operating free-air temperature range (unless otherwise
noted)
T
= 25°C
SN54HCT646 SN74HCT646
A
V
UNIT
MHz
ns
CC
MIN
MAX
31
MIN
MAX
22
MIN
MAX
27
4.5 V
5.5 V
4.5 V
5.5 V
4.5 V
5.5 V
4.5 V
5.5 V
f
t
t
t
Clock frequency
clock
36
24
29
16
14
20
18
5
23
21
30
27
5
19
17
25
23
5
Pulse duration, CLKBA or CLKAB high or low
w
ns
Setup time, A before CLKAB↑ or B before CLKBA↑
Hold time, A after CLKAB↑ or B after CLKBA↑
su
h
ns
5
5
5
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54HCT646, SN74HCT646
OCTAL BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCLS178C – MARCH 1984 – REVISED MARCH 2003
switching characteristics over recommended operating free-air temperature range, C = 50 pF
L
(unless otherwise noted) (see Figure 2)
T
A
= 25°C
TYP
54
64
18
16
14
12
20
17
25
22
25
22
25
22
25
22
9
SN54HCT646 SN74HCT646
FROM
(INPUT)
TO
(OUTPUT)
PARAMETER
V
UNIT
CC
MIN
31
MAX
MIN
22
MAX
MIN
27
MAX
4.5 V
5.5 V
4.5 V
5.5 V
4.5 V
5.5 V
4.5 V
5.5 V
4.5 V
5.5 V
4.5 V
5.5 V
4.5 V
5.5 V
4.5 V
5.5 V
4.5 V
5.5 V
f
MHz
max
pd
36
24
29
36
32
27
24
38
34
49
44
49
44
49
44
49
44
12
11
54
49
41
37
57
51
74
67
74
67
74
67
74
67
18
16
45
41
34
31
48
43
61
55
61
55
61
55
61
55
15
14
CLKBA or CLKAB
A or B
A or B
B or A
A or B
A or B
A or B
A or B
A or B
Any
t
ns
†
SBA or SAB
t
t
t
t
t
ns
ns
ns
ns
ns
OE
OE
en
dis
en
dis
t
DIR
DIR
7
†
These parameters are measured with the internal output state of the storage register opposite that of the bus input.
switching characteristics over recommended operating free-air temperature range, C = 150 pF
L
(unless otherwise noted) (see Figure 2)
T
A
= 25°C
TYP
24
SN54HCT646 SN74HCT646
FROM
(INPUT)
TO
(OUTPUT)
PARAMETER
V
UNIT
CC
MIN
MAX
53
47
44
39
55
49
66
59
66
59
42
38
MIN
MAX
80
MIN
MAX
66
60
55
50
69
62
87
74
87
74
53
48
4.5 V
5.5 V
4.5 V
5.5 V
4.5 V
5.5 V
4.5 V
5.5 V
4.5 V
5.5 V
4.5 V
5.5 V
CLKBA or CLKAB
A or B
A or B
B or A
A or B
A or B
A or B
Any
22
52
22
67
t
pd
ns
20
60
26
83
†
SBA or SAB
24
74
33
100
90
OE
22
t
t
ns
ns
en
33
100
90
DIR
22
17
63
t
14
57
†
These parameters are measured with the internal output state of the storage register opposite that of the bus input.
operating characteristics, T = 25°C
A
PARAMETER
TEST CONDITIONS
TYP
UNIT
C
Power dissipation capacitance
No load
50
pF
pd
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54HCT646, SN74HCT646
OCTAL BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCLS178C – MARCH 1984 – REVISED MARCH 2003
PARAMETER MEASUREMENT INFORMATION
V
CC
PARAMETER
R
C
S1
S2
L
L
50 pF
or
150 pF
t
t
Open
Closed
Closed
Open
PZH
S1
S2
Test
Point
t
t
1 kΩ
1 kΩ
en
R
PZL
L
From Output
Under Test
t
t
Open
Closed
Open
PHZ
PLZ
50 pF
dis
C
L
Closed
(see Note A)
50 pF
or
150 pF
t
or t
––
Open
Open
pd
t
LOAD CIRCUIT
3 V
Reference
Input
1.3 V
3 V
0 V
High-Level
0 V
1.3 V
1.3 V
1.3 V
Pulse
t
t
h
su
3 V
0 V
t
Data
Input
w
2.7 V
2.7 V
1.3 V
0.3 V
1.3 V
0.3 V
3 V
0 V
Low-Level
Pulse
1.3 V
t
t
r
f
VOLTAGE WAVEFORMS
SETUP AND HOLD AND INPUT RISE AND FALL TIMES
VOLTAGE WAVEFORMS
PULSE DURATIONS
Output
Control
(Low-Level
Enabling)
3 V
0 V
3 V
0 V
Input
1.3 V
1.3 V
1.3 V
1.3 V
t
t
PLH
PHL
90%
t
t
PLZ
PZL
V
V
OH
≈V
CC
In-Phase
Output
Output
Waveform 1
(See Note B)
90%
t
1.3 V
10%
1.3 V
10%
1.3 V
1.3 V
10%
t
OL
V
OL
OH
t
r
f
f
t
t
t
PHL
90%
PLH
PZH
PHZ
Out-of-
Phase
Output
V
V
OH
V
Output
Waveform 2
(See Note B)
90%
t
90%
1.3 V
10%
1.3 V
10%
OL
≈0 V
t
r
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES FOR 3-STATE OUTPUTS
VOLTAGE WAVEFORMS
PROPAGATION DELAY AND OUTPUT RISE AND FALL TIMES
NOTES: A.
C includes probe and test-fixture capacitance.
L
B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators having the following
characteristics: PRR ≤ 1 MHz, Z = 50 Ω, t = 6 ns, t = 6 ns.
O
r
f
D. For clock inputs, f
is measured when the input duty cycle is 50%.
max
E. The outputs are measured one at a time with one input transition per measurement.
F.
G.
H.
t
t
t
and t
and t
and t
are the same as t
are the same as t
are the same as t
.
dis
en
.
pd
PLZ
PZL
PLH
PHZ
PZH
PHL
.
Figure 2. Load Circuit and Voltage Waveforms
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PACKAGE OPTION ADDENDUM
www.ti.com
10-May-2007
PACKAGING INFORMATION
Orderable Device
SN74HCT646DW
Status (1)
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
Package Package
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
Qty
Type
Drawing
SOIC
DW
24
24
24
24
24
24
24
25 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
SN74HCT646DWE4
SN74HCT646DWG4
SN74HCT646DWR
SN74HCT646DWRE4
SN74HCT646DWRG4
SN74HCT646NT
SOIC
SOIC
SOIC
SOIC
SOIC
PDIP
DW
DW
DW
DW
DW
NT
25 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
25 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
2000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
2000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
2000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
15
15
Pb-Free
(RoHS)
CU NIPDAU N / A for Pkg Type
SN74HCT646NT3
SN74HCT646NTE4
OBSOLETE
ACTIVE
PDIP
PDIP
NT
NT
24
24
TBD
Call TI
Call TI
Pb-Free
(RoHS)
CU NIPDAU N / A for Pkg Type
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS
compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
Addendum-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
30-Apr-2007
TAPE AND REEL INFORMATION
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
30-Apr-2007
Device
Package Pins
Site
Reel
Reel
A0 (mm)
B0 (mm)
K0 (mm)
P1
W
Pin1
Diameter Width
(mm) (mm) Quadrant
(mm)
(mm)
SN74HCT646DWR
DW
24
TAI
330
24
10.75
15.7
2.7
12
24
Q1
TAPE AND REEL BOX INFORMATION
Device
Package
Pins
Site
TAI
Length (mm) Width (mm) Height (mm)
SN74HCT646DWR
DW
24
346.0
346.0
41.0
Pack Materials-Page 2
MECHANICAL DATA
MPDI004 – OCTOBER 1994
NT (R-PDIP-T**)
PLASTIC DUAL-IN-LINE PACKAGE
24 PINS SHOWN
A
PINS **
24
28
DIM
24
13
1.260
(32,04) (36,20)
1.425
A MAX
1.230
(31,24) (35,18)
1.385
A MIN
B MAX
B MIN
0.280 (7,11)
0.250 (6,35)
0.310
(7,87)
0.315
(8,00)
1
12
0.290
(7,37)
0.295
(7,49)
0.070 (1,78) MAX
B
0.020 (0,51) MIN
0.200 (5,08) MAX
Seating Plane
0.125 (3,18) MIN
0.100 (2,54)
0.010 (0,25)
0°–15°
0.021 (0,53)
0.015 (0,38)
M
0.010 (0,25) NOM
4040050/B 04/95
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
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