SN55ALS161, SN75ALS161
OCTAL GENERAL-PURPOSE INTERFACE BUS TRANSCEIVERS
SLLS019E JUNE 1986 REVISED NOVEMBER 1999
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
SUITABLE FOR IEEE STANDARD 488-1978 (GPIB)
D
8-Channel Bidirectional Transceivers
D
Designed to Implement Control Bus
Interface
D
Designed for Single Controller
D
High-Speed Advanced Low-Power Schottky
Circuitry
D
Low Power Dissipation:
SN55ALS161 . . . 59 mW Max Per Channel
SN75ALS161 . . . 46 mW Max Per Channel
D
Fast Propagation Times:
SN55ALS161 . . . 25 ns Max
SN75ALS161 . . . 20 ns Max
D
High-Impedance pnp Inputs
D
Receiver Hysteresis:
SN55ALS161 . . . 550 mV Typ
SN75ALS161 . . . 650 mV Typ
D
Bus-Terminating Resistors Provided on
Driver Outputs
D
No Loading of Bus When Device Is
Powered Down (V
CC
= 0)
D
Power-Up/Power-Down Protection
(Glitch Free)
description
The SN55ALS161 and SN75ALS161
eight-channel general-purpose interface bus
transceivers are high-speed, advanced
low-power Schottky-process devices designed to
provide the bus-management and data-transfer
signals between operating units of a
single-controller instrumentation system. When
combined with the SN55ALS160 and
SN75ALS160 octal bus transceivers, these
devices provide a complete 16-wire interface for
the IEEE 488 bus.
The SN55ALS161 and SN75ALS161 devices
feature eight driver-receiver pairs connected in a
front-to-back configuration to form input/output
(I/O) ports at both the bus and terminal sides. The
direction of data through these driver-receiver
pairs is determined by the direction-control (DC)
and talk-enable (TE) signals.
Copyright
1999, 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.
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.
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
TE
REN
IFC
NDAC
NRFD
DAV
EOI
ATN
SRQ
GND
V
CC
REN
IFC
NDAC
NRFD
DAV
EOI
ATN
SRQ
DC
SN55ALS161 . . . J OR W PACKAGE
SN75ALS161 . . . DW OR N PACKAGE
(TOP VIEW)
GPIB
I/O Ports
Terminal
I/O Ports
NAME
CLASS
IDENTITY
DC
TE
ATN
SRQ
REN
IFC
EOI
DAV
NDAC
NRFD
CHANNEL-IDENTIFICATION TABLE
Direction Control
Talk Enable
Attention
Service Request
Remote Enable
Interface Clear
End or Identify
Data Valid
Not Data Accepted
Not Ready for Data
Control
Bus
Management
Data
Transfer
3
2
1 20 19
9 10 11 12 13
4
5
6
7
8
18
17
16
15
14
IFC
NDAC
NRFD
DAV
EOI
NDAC
NRFD
DAV
EOI
ATN
SN55ALS161 . . . FK PACKAGE
(TOP VIEW)
IFC
REN
TE
SRQ
AT
N
REN
SRQ
GND
DC
V
CC
The transceivers are suitable for IEEE Standard 488 applications to the extent of the operating conditions and characteristics specified in this
data sheet. Certain limits contained in the IEEE specification are not met or cannot be tested over the entire military temperature range.
On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
SN55ALS161, SN75ALS161
OCTAL GENERAL-PURPOSE INTERFACE BUS TRANSCEIVERS
SLLS019E JUNE 1986 REVISED NOVEMBER 1999
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description (continued)
The driver outputs general-purpose interface bus (GPIB I/O ports) feature active bus-terminating resistor
circuits designed to provide a high impedance to the bus when V
CC
= 0. The drivers are designed to handle
sink-current loads up to 48 mA. Each receiver features pnp transistor inputs for high input impedance and
hysteresis of 400 mV on the commercial part, 250 mV on the military part, minimum, for increased noise
immunity. All receivers have 3-state outputs to present a high impedance to the terminal when disabled.
The SN55ALS161 is characterized for operation over the full military temperature range of 55
C to 125
C. The
SN75ALS161 is characterized for operation from 0
C to 70
C.
FUNCTION TABLE
RECEIVE/TRANSMIT
CONTROLS
BUS-MANAGEMENT CHANNELS
DATA-TRANSFER CHANNELS
DC
TE
ATN
ATN
SRQ
REN
IFC
EOI
DAV
NDAC
NRFD
(CONTROLLED BY DC)
(CONTROLLED BY TE)
H
H
H
R
T
R
R
T
T
R
R
H
H
L
R
T
R
R
R
T
R
R
L
L
H
T
R
T
T
R
R
T
T
L
L
L
T
R
T
T
T
R
T
T
H
L
X
R
T
R
R
R
R
T
T
L
H
X
T
R
T
T
T
T
R
R
H = high level, L = low level, R = receive, T = transmit, X = irrelevant
Direction of data transmission is from the terminal side to the bus side, and the direction of data receiving
is from the bus side to the terminal side.
Data transfer is noninverting in both directions.
ATN is a normal transceiver channel that functions additionally as an internal direction control or talk
enable for EOI whenever the DC and TE inputs are in the same state. When DC and TE are in opposite
states, the ATN channel functions as an independent transceiver only.
SN55ALS161, SN75ALS161
OCTAL GENERAL-PURPOSE INTERFACE BUS TRANSCEIVERS
SLLS019E JUNE 1986 REVISED NOVEMBER 1999
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
logic symbol
EN2/G5
EN1/G4
2
2
2
2
NDAC
NRFD
SRQ
REN
IFC
DAV
1
1
1
1
3
3
5
4
6
3
2
9
12
19
18
15
17
16
NRFD
NDAC
DAV
IFC
REN
SRQ
EOI
7
14
EOI
1
1
1
1
1
1
1
1
1
ATN
8
EN3
4
5
ATN
13
TE
1
11
DC
1
2
2
1
1
1
This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
logic diagram (positive logic)
11
DC
TE
1
EOI
EOI
14
7
8
13
ATN
ATN
SRQ
SRQ
12
9
REN
REN
19
2
3
18
IFC
IFC
6
15
DAV
DAV
NDAC
NDAC
17
4
5
16
NRFD
NRFD
SN55ALS161, SN75ALS161
OCTAL GENERAL-PURPOSE INTERFACE BUS TRANSCEIVERS
SLLS019E JUNE 1986 REVISED NOVEMBER 1999
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
schematics of inputs and outputs
EQUIVALENT OF ALL CONTROL INPUTS
TYPICAL OF SRQ, NDAC, AND NRFD GPIB I/O PORT
Circuit inside dashed lines is on the driver outputs only.
TYPICAL OF ALL I/O PORTS EXCEPT SRQ, NDAC, NRFD GPIB I/O PORTS
Receiver output R(eq) = 110
NOM
R(eq) = equivalent resistor
Circuit inside dashed lines is on the driver outputs only.
Driver output R(eq) = 30
NOM
GND
Input
VCC
NOM
9 k
10 k
NOM
1.7 k
NOM
NOM
4 k
Input/Output Port
10 k
NOM
1.7 k
NOM
NOM
4 k
R(eq)
NOM
4 k
Input/Output Port
SN55ALS161, SN75ALS161
OCTAL GENERAL-PURPOSE INTERFACE BUS TRANSCEIVERS
SLLS019E JUNE 1986 REVISED NOVEMBER 1999
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
CC
(see Note 1)
7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, V
I
5.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low-level driver output current, I
OL
100
mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous total dissipation
See Dissipation Rating Table
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance,
JA
(see Note 2): DW package
58
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
N package
69
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Case temperature for 60 seconds: FK package, T
C
260
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from the case for 60 seconds: J or W package
300
C
. . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from the case for 10 seconds: DW or N package
260
C
. . . . . . . . . . .
Storage temperature range, T
stg
65
C to 150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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. All voltage values are with respect to network ground terminal.
2. The package thermal impedance is calculated in accordance with JESD 51.
DISSIPATION RATING TABLE
PACKAGE
TA
25
C
POWER RATING
OPERATING
FACTOR
TA = 70
C
POWER RATING
TA = 125
C
POWER RATING
FK
1375 mW
11.0 mW/
C
880 mW
275 mW
J
1375 mW
11.0 mW/
C
880 mW
275 mW
W
1000 mW
8.0 mW/
C
640 mW
200 mW
SN55ALS161 recommended operating conditions
MIN
NOM
MAX
UNIT
Supply voltage, VCC
4.75
5
5.25
V
TE and DC at TA = 55
C to 125
C
2
High-level input voltage, VIH
Bus and terminal at TA = 25
C to 125
C
2
V
Bus and terminal at TA = 55
C
2.1
TE and DC at TA = 55
C to 125
C
0.8
Low-level input voltage, VIL
Bus and terminal at TA = 25
C to 55
C
0.8
V
Bus and terminal at TA = 125
C
0.7
High level output current IOH
Bus ports with pullups active (VCC = 5 V)
5.2
mA
High-level output current, IOH
Terminal ports
800
A
Low level output current IOL
Bus ports
48
mA
Low-level output current, IOL
Terminal ports
16
mA
Operating free-air temperature, TA
55
125
C
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