SN75123
DUAL LINE DRIVER
SLLS086C – SEPTEMBER 1973 – REVISED APRIL 1998
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D
Meets or Exceeds the Requirements of
IBM System 360 Input/Output Interface
Specification
D
Operate From Single 5-V Supply
D
TTL Compatible
D
3.11-V Output at IOH = –59.3 mA
D
Uncommitted Emitter-Follower Output
Structure for Party-Line Operation
D
Short-Circuit Protection
D
AND-OR Logic Configuration
D
Designed for Use With Triple Line Receiver
SN75124
D
Designed to Be Interchangeable With
N8T13 and N8T23
description
The SN75123 is a dual line driver specifically designed to meet the input/output interface specifications for IBM
System 360. It also is compatible with standard-TTL logic and supply-voltage levels.
The SN75123 low-impedance emitter-follower outputs drive terminated lines such as coaxial cable or twisted
pair. Having the outputs uncommitted allows wired-OR logic to be performed in party-line applications. Output
short-circuit protection is provided by an internal clamping network that turns on when the output voltage drops
below approximately 1.5 V. All the inputs are in conventional TTL configuration, and the gating can be used
during power-up and power-down sequences to ensure that no noise is introduced to the line.
The SN75123 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS
OUTPUT
A B C D E F
Y
H H H H X X H
X XXXHH H
All other input combinations L
H = high level, L = low level, X = irrelevant
Copyright 1998, 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.
IBM is a trademark of International Business Machines Corp.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1A
1B
1C
1D
1E
1F
1Y
GND
V
CC
2F
2E
2D
2C
2B
2A
2Y
D OR N PACKAGE
(TOP VIEW)
THE SN751730 IS RECOMMENDED
FOR NEW IBM 360/370 INTERFACE DESIGNS.
SN75123
DUAL LINE DRIVER
SLLS086C – SEPTEMBER 1973 – REVISED APRIL 1998
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic symbol
†
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
1
1A
2
1B
3
1C
4
1D
7
&
5
1E
6
1F
10
2A
11
2B
12
2C
13
2D
14
2E
15
2F
9
≥1
&
logic diagram (positive logic)
A
B
C
D
E
F
Y
SN75123
DUAL LINE DRIVER
SLLS086C – SEPTEMBER 1973 – REVISED APRIL 1998
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
schematic (each driver)
V
CC
To Other
Line Driver
4 kΩ 4 kΩ
A
B
C
D
E
F
GND
360 Ω 15 Ω
Y
To Other
Line Driver
1, 10
2, 11
3, 12
4, 13
5, 14
6, 15
8
16
7, 9
Resistor values shown are nominal.
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output voltage, V
O
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous total dissipation at (or below) 25°C free-air temperature (see Note 2):D package 950 mW. . . . .
N package 1150 mW. . . .
Operating free-air temperature range, T
A
0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°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, except differential input voltage, are with respect to network ground terminal.
2. For operation above 25°C free-air temperature, derate the D package to 608 mW at 70°C at the rate of 7.6 mW/°C and the N package
to 736 mW at 70°C at the rate of 9.2 mW/°C.
recommended operating conditions
MIN NOM MAX UNIT
Supply voltage, V
CC
4.75 5 5.25 V
High-level input voltage, V
IH
2 V
Low-level input voltage, V
IL
0.8 V
High-level output current, I
OH
–100 mA
Operating free-air temperature, T
A
0 70 °C
SN75123
DUAL LINE DRIVER
SLLS086C – SEPTEMBER 1973 – REVISED APRIL 1998
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics, VCC = 4.75 V to 5.25 V, TA = 0°C to 70°C (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN MAX UNIT
V
IK
Input clamp voltage VCC = 5 V, II = –12 mA –1.5 V
V
I(BR)
Input breakdown voltage VCC = 5 V, II = 10 mA 5.5 V
p
V
= 5 V, V
= 2 V,
TA = 25°C 3.11
VOHHigh-level output voltage
CC
,
IH
,
IOH = –59.3 mA, See Note 3
TA = 0°C to 70°C 2.9
V
V
OL
Low-level output voltage VIL = 0.8 V, IOL = –240 µA, See Note 3 0.15 V
p
°
IOHHigh-level output current
V
CC
=
5 V, V
IH
=
4.5 V, V
OH
=
2 V, T
A
=
25°C, See Note 3
–
100–250
mA
I
O(off)
Off-state output current VCC = 0, VO = 3 V 40 µA
I
IH
High-level input current VI = 4.5 V 40 µA
I
IL
Low-level input current VI = 0.4 V –0.1 –1.6 mA
I
OS
Short-circuit output current†VCC = 5 V, TA = 25°C –30 mA
I
CCH
Supply current, outputs high VCC = 5.25 V , All inputs at 2 V, Outputs open 28 mA
I
CCL
Supply current, outputs low VCC = 5.25 V , All inputs at 0.8 V, Outputs open 60 mA
†
Not more than one output should be shorted at a time.
NOTE 3: The output voltage and current limits are valid for any appropriate combination of high and low inputs specified by the function table
for the desired output.
switching characteristics, VCC = 5 V, TA = 25°C
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
t
PLH
Propagation delay time, low- to high-level output RL = 50 Ω, CL = 15 pF, See Figure 1 12 20 ns
t
PHL
Propagation delay time, high- to low-level output RL = 50 Ω, CL = 15 pF, See Figure 1 12 20 ns
t
PLH
Propagation delay time, low- to high-level output RL = 50 Ω, CL = 100 pF, See Figure 1 20 35 ns
t
PHL
Propagation delay time, high- to low-level output RL = 50 Ω, CL = 100 pF, See Figure 1 15 25 ns
PARAMETER MEASUREMENT INFORMATION
≤ 5 ns
0 V
V
OH
V
OL
3V
≤5 ns
Input
t
PLH
Output
t
PHL
VOLTAGE W AVEFORMSTEST CIRCUIT
Output
Pulse
Generator
(see Note A)
3 V
V
CC
C
L
(see Note B)
RL = 50 Ω
90% 90%
1.5 V 1.5 V
10%
10%
1.5 V 1.5 V
NOTES: A. The pulse generator has the following characteristics: ZO = 50 Ω, tw = 200 ns, duty cycle = 50%.
B. CL Includes probe and jig capacitance.
Figure 1. Test Circuit and Voltage Waveforms
SN75123
DUAL LINE DRIVER
SLLS086C – SEPTEMBER 1973 – REVISED APRIL 1998
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
– Output Current – mA
VO – Output Voltage – V
OUTPUT CURRENT
vs
OUTPUT VOLTAGE
I
O
VCC = 5 V
All inputs at 2 V
TA = 25°C
–300
–250
–200
–150
–100
–50
0
012345
Figure 2
APPLICATION INFORMATION
1/2 SN75123
95 Ω
95-Ω Coaxial Cable
A
B
C
D
E
F
A
B
Y
1/3 SN75124
95 Ω
Strobe
Figure 3. Unbalanced Line Communication Using SN75123 and SN75124
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Copyright 1998, Texas Instruments Incorporated
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