74ACT16254 [TI]
16-BIT ADDRESS/DATA MULTIPLEXER WITH 3-STATE OUTPUTS; 具有三态输出的16位地址/数据多路复用器
| 型号： | 74ACT16254 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 16-BIT ADDRESS/DATA MULTIPLEXER WITH 3-STATE OUTPUTS |
| 文件： | 总6页 (文件大小：94K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
74ACT16254
16-BIT ADDRESS/DATA MULTIPLEXER
WITH 3-STATE OUTPUTS
SCAS527A – AUGUST 1995 – NOVEMBER 1995
DGG PACKAGE
(TOP VIEW)
Member of the Texas Instruments
Widebus Family
Latch-Up Performance Exceeds 500 mA
Per JEDEC Standard JESD-17
B1
B3
B6
B7
B9
GND
B11
B13
B15
B2
B4
B6
B8
B10
GND
B12
B14
B16
1
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
2
Bus-Hold Inputs Eliminate the Need for
External Pullup Resistors
3
4
Typical V
< 0.8 V at V
(Output Ground Bounce)
5
OLP
= 5 V, T = 25°C
6
CC
A
7
Distributed V
Minimizes High-Speed Switching Noise
and GND Pin Configuration
CC
8
9
Packaged in Plastic Thin Shrink
Small-Outline (DGG) Package
V
V
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
CC
CC
A16
A15
A14
GND
A13
A12
A11
A10
GND
A9
C16
C15
C14
GND
C13
C12
C11
C10
GND
C9
description
The 74ACT16254 is a dual 16-bit, noninverting
bus-interface device. The A and C ports perform
a transceiver function, like that of the 74ACT245.
The B and C ports perform the buffer/driver
function of the 74ACT244. The A and C port
outputs are designed to sink up to 12 mA.
The 74ACT16254 is designed for asynchronous
communication between data buses. The control
function implementation minimizes external
timing requirements.
A8
A7
C8
C7
V
V
CC
A6
CC
C6
C5
C4
GND
C3
C2
C1
NC
NC
Data transmission from the A port to the C port,
C port to A port, or B port to C port is accomplished
by setting the appropriate logic levels on the bus
enable (EN1 and EN2) inputs.
A5
A4
GND
A3
A2
A1
EN2
EN1
All outputs are disabled when logic highs are
placed on both EN1 and EN2; the buses are
effectively isolated.
The 74ACT16254 is packaged in TI’s thin shrink
small-outline package (DGG), which provides
twice the I/O pin count and functionality of
standard small-outline packages in the same
printed-circuit-board area.
NC – No internal connection
Active bus-hold circuitry is provided to hold unused or floating data and I/O pins at a valid logic level.
The 74ACT16254 is characterized for operation from –40°C to 85°C.
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.
Widebus is a trademark of Texas Instruments Incorporated.
Copyright 1995, Texas Instruments Incorporated
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.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
74ACT16254
16-BIT ADDRESS/DATA MULTIPLEXER
WITH 3-STATE OUTPUTS
SCAS527A – AUGUST 1995 – NOVEMBER 1995
FUNCTION TABLE
INPUTS
OPERATION
EN2
H
EN1
H
Isolation
H
L
B data to C bus
A data to C bus
C data to A bus
L
H
L
L
logic diagram, each port (positive logic)
32
EN1
31
EN2
35
30
C1
A1
0
2:1
MUX
1
1
B1
To 15 Other Channels
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
74ACT16254
16-BIT ADDRESS/DATA MULTIPLEXER
WITH 3-STATE OUTPUTS
SCAS527A – AUGUST 1995 – NOVEMBER 1995
†
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V
CC
Input voltage range, V (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to V
+ 0.5 V
+ 0.5 V
I
CC
CC
Output voltage range, V (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to V
O
Current into any output in the low state, I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 mA
O
Input clamp current, I (V < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –50 mA
IK
I
Output clamp current, I
(V < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –50mA
OK
O
CC
Continuous current through V
Maximum power dissipation at T = 55°C (in still air) (see Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 W
Storage temperature range, T
or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±100 mA
A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –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 negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.
2. The maximum package power dissipation is calculated using a junction temperature of 150°C and a board trace length of 750 mils.
recommended operating conditions (see Note 3)
MIN
4.5
2
MAX
UNIT
V
V
V
V
V
Supply voltage
5.5
CC
High-level input voltage
Low-level input voltage
Input voltage
V
IH
0.8
V
IL
0
V
CC
V
I
I
I
High-level output current
Low-level output current
Input transition rise or fall rate
Operating free-air temperature
–12
12
mA
mA
ns/V
°C
OH
OL
∆t/∆v
10
T
–40
85
A
NOTE 3: Unused inputs must be held high or low to prevent them from floating.
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
74ACT16254
16-BIT ADDRESS/DATA MULTIPLEXER
WITH 3-STATE OUTPUTS
SCAS527A – AUGUST 1995 – NOVEMBER 1995
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
†
PARAMETER
TEST CONDITIONS
I = –18 mA
MIN TYP
MAX
UNIT
V
IK
V
V
V
V
V
V
V
V
V
V
V
V
= 4.5 V,
= 4.5 V,
= 5.5 V,
= 4.5 V,
= 4.5 V to 5.5 V,
= 4.5 V,
= 5.5 V,
= 4.5 V,
= 4.5 V,
= 5.5 V,
= 5.5 V,
= 5.5 V,
–1.2
V
CC
CC
CC
CC
CC
CC
CC
CC
CC
CC
CC
CC
I
I
I
I
I
I
= –100 µA
= –100 µA
= –12 mA
= 100 µA
= 12 mA
3
4.2
3
OH
OH
OH
OL
OL
V
OH
V
0.1
0.4
V
OL
V
I
I
V = V
or GND
Inputs only
±10
µA
µA
I
I
CC
= 2 V
V
V
V
–100
100
I
A, B, or C port
hold
= 0.8 V
I
‡
I
I
= V
or GND
CC
or GND
±20
µA
µA
OZ
O
I
O
= 0, V = V
50
CC
I
CC
One input at 3.4 V,
500
µA
I
CC
Other inputs at V
or GND
CC
C
C
V
V
= 5 V,
= 5 V,
V = V
or GND
3.5
5
pF
pF
i
CC
I
CC
= V or GND
CC
V
O
io
CC
†
‡
§
All typical values are at T = 25°C.
A
The parameter I
includes the input-leakage current.
OZ
This is the increase in supply current for each input that is at the specified TTL voltage level rather than V
or GND.
CC
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, C = 50 pF (unless otherwise noted) (see Figure 1)
L
T
A
= 25°C
TYP
3.7
FROM
(INPUT)
TO
(OUTPUT)
PARAMETER
UNIT
MIN
1.5
1.5
1.5
1.5
1.5
MAX
6.2
5.5
9.5
8
t
t
t
t
t
A or B
C
C
A
C
C
A
A
ns
ns
ns
ns
ns
pd
pd
en
dis
en
3.3
EN1 or EN2
EN1 or EN2
EN2
5.3
4.4
6.2
10.5
t
EN2
1.5
4.8
8
ns
dis
operating characteristics, T = 25°C
A
PARAMETER
TEST CONDITIONS
C = 50 pF, f = 10 MHz
L
TYP
16
2
UNIT
pF
Outputs enabled
Outputs disabled
C
Power dissipation capacitance
pd
pF
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
74ACT16254
16-BIT ADDRESS/DATA MULTIPLEXER
WITH 3-STATE OUTPUTS
SCAS527A – AUGUST 1995 – NOVEMBER 1995
PARAMETER MEASUREMENT INFORMATION
7 V
TEST
S1
S1
t
Open
7 V
pd
/t
500 Ω
Open
GND
From Output
Under Test
t
PLZ PZL
/t
t
GND
PHZ PZH
500 Ω
C
= 50 pF
L
(see Note A)
LOAD CIRCUIT
1.5 V
t
w
3 V
0 V
3 V
0 V
Timing Input
1.5 V
1.5 V
Input
t
t
h
su
VOLTAGE WAVEFORMS
PULSE DURATION
3 V
0 V
Data Input
1.5 V
1.5 V
3 V
0
Output
Control
(low-level
enabling)
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
1.5 V
1.5 V
t
PZL
t
PLZ
3 V
0 V
3.5 V
Input
Output
Waveform 1
S1 at 7 V
1.5 V
1.5 V
1.5 V
V
OL
+ 0.3 V
V
OL
t
(see Note B)
PLH
t
PHZ
t
PHL
t
PZH
V
OH
V
Output
Waveform 2
S1 at GND
OH
Output
V
– 0.3 V
OH
1.5 V
1.5 V
1.5 V
V
OL
≈ 0 V
(see Note B)
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
NOTES: A.
C
includes probe and jig 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. All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, Z = 50 Ω, t ≤ 2.5 ns, t ≤ 2.5 ns.
O
r
f
D. The outputs are measured one at a time with one input transition per measurement.
E.
F.
G.
t
t
t
and t
and t
and t
are the same as t
are the same as t
are the same as t
.
.
.
pd
PLZ
PZL
PHL
PHZ
PZH
PLH
dis
en
Figure 1. Load Circuit and Voltage Waveforms
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
IMPORTANT NOTICE
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO
BE FULLY AT THE CUSTOMER’S RISK.
In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
semiconductor products or services might be or are used. TI’s publication of information regarding any third
party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.
Copyright 1998, Texas Instruments Incorporated
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