TEXAS INSTRUMENTS 54ACT16861, 74ACT16861 Technical data
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54ACT16861, 74ACT16861
20-BIT BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCAS197B – JUNE 1990 – REVISED NOVEMBER 1996
D
Members of the Texas Instruments
Widebus
D
Inputs Are TTL-Voltage Compatible
D
3-State Outputs Drive Bus Lines Directly
D
Flow-Through Architecture Optimizes
Family
PCB Layout
D
Distributed VCC and GND Pin Configuration
Minimizes High-Speed Switching Noise
D
EPIC
(Enhanced-Performance Implanted
CMOS) 1-µm Process
D
500-mA Typical Latch-Up Immunity at
125°C
D
Package Options Include Shrink Plastic
Small-Outline 300-mil (DL) Packages Using
25-mil Center-to-Center Pin Spacings and
380-mil Fine-Pitch Ceramic Flat (WD)
Packages Using 25-mil Center-to-Center
Pin Spacings
description
The ’ACT16861 are noninverting 20-bit
transceivers designed for asynchronous
communication between data buses. The
control-function implementation minimizes
external timing requirements.
The ’ACT16861 can be used as two 10-bit
transceivers or one 20-bit transceiver. They allow
data transmission from the A bus to the B bus or
from the B bus to the A bus, depending upon the
logic level at the output-enable (OEAB
inputs. The output-enable inputs can be used to
disable the device so that the buses are effectively
isolated.
or OEBA)
54ACT16861 . . . WD PACKAGE
74ACT16861 . . . DL PACKAGE
1OEAB
2OEAB
1B1
1B2
GND
1B3
1B4
V
CC
1B5
1B6
1B7
GND
1B8
1B9
1B10
2B1
2B2
2B3
GND
2B4
2B5
2B6
V
CC
2B7
2B8
GND
2B9
2B10
(TOP VIEW)
1
56
2
55
3
54
4
53
5
52
6
51
7
50
8
49
9
48
10
47
11
46
12
45
13
44
14
43
15
42
16
41
17
40
18
39
19
38
20
37
21
36
22
35
23
34
24
33
25
32
26
31
27
30
28
29
1OEBA
1A1
1A2
GND
1A3
1A4
V
CC
1A5
1A6
1A7
GND
1A8
1A9
1A10
2A1
2A2
2A3
GND
2A4
2A5
2A6
V
CC
2A7
2A8
GND
2A9
2A10
2OEBA
The 74ACT16861 is packaged in TI’s shrink small-outline package, which provides twice the I/O pin count and
functionality of standard small-outline packages in the same printed-circuit-board area.
The 54ACT16861 is characterized for operation over the full military temperature range of –55°C to 125°C. The
74ACT16861 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.
EPIC and Widebus are trademarks of 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.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Copyright 1996, Texas Instruments Incorporated
1
54ACT16861, 74ACT16861
OPERATION
20-BIT BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCAS197B – JUNE 1990 – REVISED NOVEMBER 1996
FUNCTION TABLE
(each 10-bit section)
INPUTS
OEAB
OEBA
L L
L H A to B
H L B to A
H H Isolation
Latch A and B
(A = B)
logic symbol
†
1OEBA
1OEAB
2OEBA
2OEAB
1A1
1A2
1A3
1A4
1A5
1A6
1A7
1A8
1A9
1A10
2A1
2A2
2A3
2A4
2A5
2A6
2A7
2A8
2A9
2A10
56
1
29
28
55
54
52
51
49
48
47
45
44
43
42
41
40
38
37
36
34
33
31
30
EN1
EN2
EN3
EN4
11
31
1 2
14
10
12
13
14
15
16
17
19
20
21
23
24
26
27
2
1B1
3
1B2
5
1B3
6
1B4
8
1B5
9
1B6
1B7
1B8
1B9
1B10
2B1
2B2
2B3
2B4
2B5
2B6
2B7
2B8
2B9
2B10
†
2
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
UNIT
logic diagram (positive logic)
54ACT16861, 74ACT16861
20-BIT BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCAS197B – JUNE 1990 – REVISED NOVEMBER 1996
1OEBA
1OEAB
1A1
56
1
To Nine Other Channels
2OEBA
2OEAB
255
1B1
2A1
29
28
To Nine Other Channels
1542
2B1
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, VCC –0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, VI (see Note 1) –0.5 V to VCC + 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output voltage range, VO (see Note 1) –0.5 V to VCC + 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, IIK (VI < 0 or VI > VCC) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output clamp current, IOK (VO < 0 or VO > VCC) ±50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous output current, I
Continuous current through VCC or GND ±500 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum power package dissipation at TA = 55°C (in still air) (see Note 2): DL package 1.4 W. . . . . . . . . . .
Storage temperature range, T
†
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 maximum package power dissipation is calculated using a junction temperature of 150°C and a board trace length of 750 mils.
(VO = 0 to VCC) ±50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
stg
†
recommended operating conditions (see Note 3)
54ACT16861 74ACT16861
MIN NOM MAX MIN NOM MAX
V
V
V
V
V
I
OH
I
OL
∆t/∆v Input transition rise or fall rate 0 10 0 10 ns/V
T
NOTE 3: Unused inputs must be held high or low to prevent them from floating.
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.
Supply voltage 4.5 5 5.5 4.5 5 5.5 V
CC
High-level input voltage 2 2 V
IH
Low-level input voltage 0.8 0.8 V
IL
Input voltage 0 V
I
Output voltage 0 V
O
High-level output current –24 –24 mA
Low-level output current 24 24 mA
Operating free-air temperature –55 125 –40 85 °C
A
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
CC
CC
0 V
0 V
CC
CC
V
V
3
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