MAX3095 [MAXIM]
【15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers; ± 15kV ESD保护， 10Mbps的， 3V / 5V ，四路RS - 422 / RS - 485接收器
| 型号： | MAX3095 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 【15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers |
| 文件： | 总12页 (文件大小：165K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-0498; Rev 0; 3/98
±1 5 k V ES D-P ro t e c t e d , 1 0 Mb p s , 3 V/5 V,
Qu a d RS -4 2 2 /RS -4 8 5 Re c e ive rs
5/MAX3096
________________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
♦ ESD Protection:
The MAX3095/MAX3096 are rugged, low-power, quad,
RS-422/RS-485 receivers with electrostatic discharge
(ESD) protection for use in harsh environments. All
receiver inputs are protected to ±15kV using IEC 1000-
4-2 Air-Gap Discharge, ±8kV using IEC 1000-4-2 Contact
Discharge, and ±15kV using the Human Body Model.
The MAX3095 operates from a +5V supply, while the
MAX3096 operates from a +3.3V supply. Receiver prop-
agation delays are guaranteed to within ±8ns of a pre-
determined value, thereby ensuring device-to-device
matching across production lots.
±15kV—IEC 1000-4-2, Air-Gap Discharge
±8kV—IEC 1000-4-2, Contact Discharge
±15kV—Human Body Model
♦ Guaranteed Propagation-Delay Tolerance
Between All ICs:
±8ns (MAX3095)
±10ns (MAX3096)
♦ Single +3V Operation (MAX3096)
Single +5V Operation (MAX3095)
♦ 16-Pin QSOP (8-pin SO footprint)
♦ 10Mbps Data Rate
Complementary enable inputs can be used to place the
devices in a 1nA low-power shutdown mode in which
the receiver outputs are high impedance. When active,
these receivers have a fail-safe feature that guarantees
a logic-high output if the input is open circuit. They also
feature a quarter-unit-load input impedance that allows
128 receivers on a bus.
♦ Allow up to 128 Receivers on the Bus
♦ 1nA Low-Power Shutdown Mode
♦ 2.4mA Operating Supply Current
♦ Pin-Compatible Upgrades to ’26LS32
The MAX3095/MAX3096 are pin-compatible, low-power
upgrades to the industry-standard ’26LS32. They are
available in a space-saving QSOP package.
_______________Ord e rin g In fo rm a t io n
PART
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 Plastic DIP
16 Narrow SO
16 QSOP
MAX3095CPE
MAX3095CSE
MAX3095CEE
MAX3095EPE
MAX3095ESE
MAX3095EEE
MAX3096CPE
MAX3096CSE
MAX3096CEE
MAX3096EPE
MAX3096ESE
MAX3096EEE
________________________Ap p lic a t io n s
Telecommunications Equipment
Rugged RS-422/RS-485/RS-423 Bus Receiver
Receivers for ESD-Sensitive Applications
Level Translators
16 Plastic DIP
16 Narrow SO
16 QSOP
16 Plastic DIP
16 Narrow SO
16 QSOP
________________Fu n c t io n a l Dia g ra m
16 Plastic DIP
16 Narrow SO
16 QSOP
V
CC
G
G
MAX3095
MAX3096
P in Co n fig u ra t io n
A1
B1
A2
B2
A3
TOP VIEW
Y1
B1
A1
1
2
3
4
5
6
7
8
16 V
CC
15 B4
14 A4
13 Y4
Y2
Y3
Y4
Y1
G
MAX3095
MAX3096
Y2
12 G
B3
A4
A2
11 Y3
10 A3
B2
B4
GND
9 B3
GND
DIP/SO/QSOP
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
±1 5 k V ES D-P ro t e c t e d , 1 0 Mb p s , 3 V/5 V,
Qu a d RS -4 2 2 /RS -4 8 5 Re c e ive rs
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V )...............................................................7V
Operating Temperature Ranges
CC
Control Input Voltage (G, G).......................-0.3V to (V + 0.3V)
Receiver Input Voltage (A_, B_)...........................................±25V
MAX309_C_ _ .....................................................0°C to +70°C
MAX309_E_ _...................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
CC
Receiver Output Voltage (Y_).....................-0.3V to (V + 0.3V)
CC
Continuous Power Dissipation (T = +70°C)
A
Plastic DIP (derate 10.5mW/°C above +70°C) ............762mW
SO (derate 8.7mW/°C above +70°C)...........................696mW
QSOP (derate 8.3mW/°C above +70°C)......................667mW
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 in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS—MAX3095
(V = 5V ±5%, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
CC
A
MIN
MAX
A
5/MAX3096
PARAMETER
SYMBOL
CONDITIONS
-7V ≤ V ≤ 12V
MIN
TYP
MAX
UNITS
mV
Receiver Differential Input
Threshold
V
TH
-200
200
CM
Receiver Input Hysteresis
V
CM
= 0
45
mV
V
= 12V
= -7V
250
-200
±1
IN
Receiver Input Current (A_, B_)
I
V
CC
= 0 or 5.25V
µA
IN
V
IN
µA
V
Enable Input Current (G, G)
Enable Input High Voltage (G, G)
Enable Input Low Voltage (G, G)
V
2.0
IH
V
0.8
V
IL
I
= -4mA, V = 200mV,
ID
OUT
Receiver Output High Voltage
Receiver Output Low Voltage
V
V
CC
- 1.5
V
V
OH
G = V or G = GND, Figure 1
CC
I
= 4mA, V = -200mV,
ID
OUT
V
OL
0.4
G = V or G = GND, Figure 1
CC
Three-State Current at Receiver
Output
I
±1
µA
0 ≤ V
≤ V , G = GND and G = V
CC CC
OZR
OUT
Output Short-Circuit Current
Receiver Input Resistance
I
±7
48
±75
mA
kΩ
0 ≤ V
≤ V , G = V or G = GND
OSR
OUT
CC
CC
R
-7V ≤ V ≤ 12V
CM
IN
2.4
0.001
±15
±15
±8
3.5
10
mA
µA
No load, G = V or G = GND
CC
Supply Current
I
CC
G = GND and G = V
CC
Human Body Model
ESD Protection
(Note 2)
IEC1000-4-2 (Air-Gap Discharge)
IEC1000-4-2 (Contact Discharge)
kV
2
_______________________________________________________________________________________
±1 5 k V ES D-P ro t e c t e d , 1 0 Mb p s , 3 V/5 V,
Qu a d RS -4 2 2 /RS -4 8 5 Re c e ive rs
5/MAX3096
SWITCHING CHARACTERISTICS—MAX3095
(V = 5V ±5%, T = T
to T , unless otherwise noted. Typical values are at T = +25°C.)
MAX A
CC
A
MIN
PARAMETER
SYMBOL
CONDITIONS
= 5V ±5%, T = T to T
MAX
MIN
65
78
71
65
82
74
68
TYP
MAX
98
UNITS
V
CC
A
MIN
T
= +85°C
= +25°C
= -40°C
= +85°C
= +25°C
= -40°C
86
79
73
90
82
76
94
A
V
= 5.25V
= 4.75V
T
A
87
CC
Input-to-Output Propagation
Delay
t
, t
PLH PHL
T
A
81
ns
|V | = 3V,
Figure 2
ID
T
A
98
V
CC
T
A
90
T
A
84
Device-to-Device Propagation-
Delay Matching
16
ns
ns
ns
ns
ns
|V | = 3V, Figure 2, matched conditions
ID
Propagation-Delay Skew
t
-4
600
600
60
±10
800
800
100
100
SK
(t
- t
)
PLH PHL
Output Enable Time to
Low Level
t
Figure 3
Figure 3
Figure 3
Figure 3
ZL
Output Enable Time to
High Level
t
ZH
Output Disable Time from
Low Level
t
LZ
Output Disable Time from
High Level
t
60
ns
HZ
Maximum Data Rate
fMAX
10
Mbps
DC ELECTRICAL CHARACTERISTICS—MAX3096
(V = 3.0V to 3.6V, T = T
to T
, unless otherwise noted. Typical values are at V = 3.3V, T = +25°C.) (Note 1)
CC
A
MIN
MAX
CC
A
PARAMETER
SYMBOL
CONDITIONS
-7V ≤ V ≤ 12V
MIN
TYP
MAX
UNITS
mV
Receiver Differential Input
Threshold
V
TH
-200
200
CM
Receiver Input Hysteresis
V
CM
= 0
45
mV
V
= 12V
250
-200
±1
IN
Receiver Input Current (A_, B_)
I
V
CC
= 0 or 3.6V
µA
IN
V
IN
= -7V
µA
V
Enable Input Current (G, G)
Enable Input High Voltage (G, G)
Enable Input Low Voltage (G, G)
V
2.0
IH
V
0.8
V
IL
I
= -1.5mA, V = 200mV,
ID
OUT
Receiver Output High Voltage
Receiver Output Low Voltage
V
V
CC
- 0.4
V
V
OH
G = V or G = GND, Figure 1
CC
I
= 2.5mA, V = -200mV,
ID
OUT
V
OL
0.4
G = V or G = GND, Figure 1
CC
Three-State Current at Receiver
Output
I
±1
µA
0 ≤ V
≤ V , G = GND and G = V
CC CC
OZR
OUT
Output Short-Circuit Current
Receiver Input Resistance
I
±4
48
±60
mA
0 ≤ V
≤ V , G = V or G = GND
OSR
OUT
CC
CC
R
-7V ≤ V ≤ 12V
kΩ
IN
CM
_______________________________________________________________________________________
3
±1 5 k V ES D-P ro t e c t e d , 1 0 Mb p s , 3 V/5 V,
Qu a d RS -4 2 2 /RS -4 8 5 Re c e ive rs
DC ELECTRICAL CHARACTERISTICS—MAX3096 (continued)
(V = 3.0V to 3.6V, T = T
to T
, unless otherwise noted. Typical values are at V = 3.3V, T = +25°C.) (Note 1)
CC
A
MIN
MAX
CC
A
PARAMETER
SYMBOL
CONDITIONS
No load, G = V or G = GND
MIN
TYP
2.4
MAX
4.0
UNITS
mA
CC
Supply Current
I
CC
0.001
±15
±15
±8
10
µA
G = GND and G = V
CC
Human Body Model
ESD Protection
(Note 2)
IEC1000-4-2 (Air-Gap Discharge)
IEC1000-4-2 (Contact Discharge)
kV
SWITCHING CHARACTERISTICS—MAX3096
(V = 3.0V to 3.6V, T = T
to T , unless otherwise noted. Typical values are at T = +25°C.)
MAX A
CC
A
MIN
PARAMETER
SYMBOL
CONDITIONS
= 3.0V to 3.6V, T = T
MIN
69
TYP
MAX
123
108
98
UNITS
V
to T
MAX
CC
A
MIN
T
= +85°C
= +25°C
= -40°C
= +85°C
= +25°C
= -40°C
88
98
88
A
V
CC
= 3.60V
T
A
78
5/MAX3096
Input-to-Output Propagation
Delay
t
, t
PLH PHL
T
A
69
79
89
ns
|V | = 3V,
Figure 2
ID
T
A
103
91
113
101
92
123
111
102
V
CC
= 3.00V
T
A
T
A
82
Device-to-Device Propagation-
Delay Matching
20
ns
ns
ns
ns
ns
|V | = 3V, Figure 2, matched conditions
ID
Propagation-Delay Skew
t
-2
600
600
80
±10
1000
1000
180
SK
(t
- t
)
PLH PHL
Output Enable Time to
Low Level
t
Figure 3
Figure 3
Figure 3
Figure 3
ZL
Output Enable Time to
High Level
t
t
ZH
Output Disable Time from
Low Level
t
LZ
Output Disable Time from
High Level
80
180
ns
HZ
Maximum Data Rate
fMAX
10
Mbps
Note 1: All currents into the device are positive; all currents out of the device are negative. All voltages are referred to device
ground, unless otherwise noted.
Note 2: Receiver inputs (A_, B_).
4
_______________________________________________________________________________________
±1 5 k V ES D-P ro t e c t e d , 1 0 Mb p s , 3 V/5 V,
Qu a d RS -4 2 2 /RS -4 8 5 Re c e ive rs
5/MAX3096
Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s
= 3.3V for MAX3096, T = +25°C, unless otherwise noted.)
A
(V = 5V for MAX3095, V
CC
CC
OUTPUT LOW VOLTAGE
vs. TEMPERATURE
OUTPUT CURRENT vs.
OUTPUT LOW VOLTAGE
OUTPUT CURRENT vs.
OUTPUT HIGH VOLTAGE
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-50
30
25
20
15
10
5
I
= 8mA
OUT
MAX3095
-40
-30
-20
-10
0
MAX3095
MAX3096
MAX3096
MAX3095
60
MAX3096
0
-40
-15
10
35
85
0
1
2
3
4
5
0
1
2
3
4
5
TEMPERATURE (°C)
OUTPUT LOW VOLTAGE (V)
OUTPUT HIGH VOLTAGE (V)
OUTPUT HIGH VOLTAGE
vs. TEMPERATURE
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
SUPPLY CURRENT vs. TEMPERATURE
5
4
3
2
1
0
3.0
2.8
2.6
2.4
2.2
2.0
20
15
10
5
MAX3095
MAX3095/MAX3096
MAX3096
MAX3095
MAX3096
I
= -8mA
-15
OUT
0
-40
10
35
60
85
-40
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
MAX3095
PROPAGATION DELAY vs. TEMPERATURE
MAX3096
PROPAGATION DELAY vs. TEMPERATURE
120
110
100
90
140
130
120
110
100
90
V
= 3V
V
= 3V
ID
ID
C = 15pF
L
C = 15pF
L
80
70
80
-40
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
_______________________________________________________________________________________
5
±1 5 k V ES D-P ro t e c t e d , 1 0 Mb p s , 3 V/5 V,
Qu a d RS -4 2 2 /RS -4 8 5 Re c e ive rs
Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
= 3.3V for MAX3096, T = +25°C, unless otherwise noted.)
A
(V = 5V for MAX3095, V
CC
CC
SHUTDOWN TIMING
MAX3095 TOC09
MAX3095
5V/div
Y VOLTAGE
2V/div
2V/div
MAX3096
Y VOLTAGE
G VOLTAGE
TIME (200ns/div)
CIRCUIT OF FIGURE 3,
5/MAX3096
S1 OPEN, S2 CLOSED, S3 = 1V
P in De s c rip t io n
PIN
1
NAME
B1
FUNCTION
Inverting Receiver Input
2
A1
Noninverting Receiver Input
Receiver Output. Enabled when G = high OR G = low. Y1 will be logic high if A1 > B1 by 200mV, and low if
A1 < B1 by 200mV. It will be logic high if A1 and B1 remain floating. Otherwise, the state is undetermined.
Y1 goes high impedance when the G = low and G = high.
3
4
Y1
G
Receiver Output Enable High. A logic high on this input enables all receivers. When taken low and G is high,
all receivers are shut down, and the outputs go high impedance.
5
6
Y2
A2
Receiver Output. Same functionality as Y1.
Noninverting Receiver Input
Inverting Receiver Input
7
B2
8
GND
B3
Ground
9
Inverting Receiver Input
10
11
A3
Noninverting Receiver Input
Receiver Output. Same functionality as Y1.
Y3
Receiver Output Enable Low. A logic low on this pin enables all receivers. When G = high and G = low, all
receivers are shut down, and the outputs go high impedance.
12
G
13
14
15
16
Y4
A4
B4
Receiver Output. Same functionality as Y1.
Noninverting Receiver Input
Inverting Receiver Input
V
CC
Positive Supply
6
_______________________________________________________________________________________
±1 5 k V ES D-P ro t e c t e d , 1 0 Mb p s , 3 V/5 V,
Qu a d RS -4 2 2 /RS -4 8 5 Re c e ive rs
5/MAX3096
OUT
V
ID
V
= 3V
| |
ID
R
C
L
15pF
V
ID
R
G = V or G = GND
CC
V
OL
V
OH
I
(+)
I
OH
(-)
OL
3.0V
0V
IN
1.5V
1.5V
t
t
PHL
PLH
V
CC
Figure 1. Receiver V and V
OH
OL
1.5V
1.5V
OUT
0V
Figure 2. Receiver Propagation Delay
V
CC
S1
S3
+1V
-1V
V
CC
G
1k
V
ID
R
S2
C
L
G
15pF
3V
0
3V
0
G
1.5V
1.5V
G
t
ZH
t
HZ
t
ZL
t
LZ
V
CC
V
OH
OUT
1.5V
1.5V
OUT
0.25V
V
OL
0
0.25V
S1 OPEN
S2 CLOSED
S3 = 1V
S1 CLOSED
S2 OPEN
S3 = -1V
Figure 3. Receiver Enable and Disable Times
_______________________________________________________________________________________
7
±1 5 k V ES D-P ro t e c t e d , 1 0 Mb p s , 3 V/5 V,
Qu a d RS -4 2 2 /RS -4 8 5 Re c e ive rs
The ma in d iffe re nc e b e twe e n te s ts d one us ing the
_______________De t a ile d De s c rip t io n
Human Body Model and IEC 1000-4-2 is higher peak
current in IEC 1000-4-2. Because series resistance is
lower in the IEC 1000-4-2 ESD test model (Figure 5a), the
ESD-withstand voltage measured to this standard is gen-
erally lower than that measured using the Human Body
Model. Figure 5b shows the current waveform for the
±8kV IEC 1000-4-2 Level 4 ESD Contact-Discharge test.
The Air-Gap test involves approaching the device with a
charge probe. The Contact-Discharge method connects
the probe to the device before the probe is energized.
±1 5 k V ES D P ro t e c t io n
As with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against electro-
static discharges (ESD) encountered during handling
and assembly. The MAX3095/MAX3096 receiver inputs
have extra protection against static electricity found in
normal operation. Maxim’s engineers developed state-
of-the-art structures to protect these pins against ±15kV
ESD, without damage. After an ESD event, the MAX3095/
MAX3096 continue working without latchup.
Machine Model
The Machine Model for ESD testing uses a 200pF stor-
age capacitor and zero-discharge resistance. It mimics
the stress caused by handling during manufacturing
and assembly. Of course, all pins (not just RS-485
inputs) require this protection during manufacturing.
Therefore, the Machine Model is less relevant to the I/O
ports than are the Human Body Model and IEC 1000-4-2.
ESD protection can be tested in several ways. The
receiver inputs are characterized for protection to the
following:
1) ±15kV using the Human Body Model
2) ±8kV using the Contact-Discharge Method specified
in IEC 1000-4-2 (formerly IEC 801-2)
5/MAX3096
3) ± 15kV us ing the Air-Ga p Me thod s p e c ifie d in
IEC 1000-4-2 (formerly IEC 801-2)
Lo w -P o w e r S h u t d o w n Mo d e
Table 1 shows the functionality of the enable inputs.
The MAX3095/MAX3096 enter shutdown when G is low
and G is high. In shutdown, all outputs go high imped-
ance and the devices typically draw less than 1nA. The
devices exit shutdown by taking G high or G low. The
typical shutdown exit time is 600ns.
ESD Test Conditions
ESD performance depends on a number of conditions.
Contact Maxim for a reliability report that documents
test setup, methodology, and results.
Human Body Model
Figure 4a shows the Human Body Model, and Figure
4b shows the current waveform it generates when dis-
charged into a low impedance. This model consists of a
100pF capacitor charged to the ESD voltage of interest,
which is then discharged into the device through a
1.5kΩ resistor.
Table 1. Function Table
OUTPUT
Y
DEVICE
MODE
G
G
(A - B)
1
X
X
X
0
≥ 200mV
≤ -200mV
Open
1
On
On
1
0
IEC 1000-4-2
Since January 1996, all equipment manufactured and/or
1
1
On
sold in the European community has been required to
meet the stringent IEC 1000-4-2 specification. The IEC
1000-4-2 standard covers ESD testing and performance
of finished equipment; it does not specifically refer to inte-
grated circuits. The MAX3095/MAX3096 help you design
equipment that meets Level 4 (the highest level) of IEC
1000-4-2, without additional ESD-protection components.
X
X
X
0
≥ 200mV
≤ -200mV
Open
1
On
0
0
1
On
0
On
1
X
High-Z
Shutdown
X = don’t care, High-Z = high impedance
8
_______________________________________________________________________________________
±1 5 k V ES D-P ro t e c t e d , 1 0 Mb p s , 3 V/5 V,
Qu a d RS -4 2 2 /RS -4 8 5 Re c e ive rs
5/MAX3096
R
D
R
C
1.5k
1M
I 100%
P
90%
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
I
r
DISCHARGE
RESISTANCE
CHARGE-CURRENT
LIMIT RESISTOR
AMPERES
HIGH-
VOLTAGE
DC
DEVICE
UNDER
TEST
36.8%
C
100pF
STORAGE
CAPACITOR
s
10%
0
SOURCE
TIME
0
t
RL
t
DL
CURRENT WAVEFORM
Figure 4a. Human Body ESD Test Model
Figure 4b. Human Body Model Current Waveform
R
R
330Ω
C
D
I
50M to 100M
100%
90%
DISCHARGE
RESISTANCE
CHARGE-CURRENT
LIMIT RESISTOR
HIGH-
VOLTAGE
DC
DEVICE
UNDER
TEST
C
s
150pF
STORAGE
CAPACITOR
SOURCE
10%
t = 0.7ns to 1ns
r
t
30ns
60ns
Figure 5b. IEC 1000-4-2 ESD-Generator Current Waveform
Figure 5a. IEC 1000-4-2 ESD Test Model
_______________________________________________________________________________________
9
±1 5 k V ES D-P ro t e c t e d , 1 0 Mb p s , 3 V/5 V,
Qu a d RS -4 2 2 /RS -4 8 5 Re c e ive rs
Ap p lic a t io n s In fo rm a t io n
P ro p a g a t io n -De la y Ma t c h in g
The MAX3095/MAX3096 exhibit propagation delays that
are closely matched from one device to another, even
V
CC
between devices from different production lots. This fea-
ture allows multiple data lines to receive data and clock
1k
signals with minimal skewing with respect to each other.
The MAX3095 receiver propagation delays are trimmed
to a predetermined value ±8ns, while the MAX3096
MAX3095
MAX3096
A
B
150Ω
delays are trimmed to a predetermined value ±10ns.
1 2 8 Re c e ive rs o n t h e Bu s
The standard RS-485 input impedance is 12kΩ (one-
unit load). The standard RS-485 transmitter can drive
1k
32 unit loads. The MAX3095/MAX3096 present a 1/4-
unit-load input impedance (48kΩ), which allows up to
128 receivers on a bus. Any combination of these RS-
485 receivers with a total of 32 unit loads can be con-
nected to the same bus.
5/MAX3096
Figure 6. External Fail-Safe Implementation
Fa il-S a fe Im p le m e n t a t io n
The MAX3095/MAX3096 receiver inputs guarantee a
logic high output when the inputs are open circuit (no
termination resistor used). This occurs when the trans-
mitter is removed from the bus or when all transmitter
outputs are high impedance. However, when the line is
terminated and the transmitters are disabled, the differ-
ential voltage between the A and B inputs falls below
the ±200mV RS-485 sensitivity threshold. Consequent-
ly, the outputs become undefined. To maintain a fail-
safe receiver output while using a terminating resistor,
input A must be biased at least 200mV above input B.
The resistor-divider network shown in Figure 6 is rec-
ommended.
Ch ip In fo rm a t io n
TRANSISTOR COUNT: 676
10 ______________________________________________________________________________________
±1 5 k V ES D-P ro t e c t e d , 1 0 Mb p s , 3 V/5 V,
Qu a d RS -4 2 2 /RS -4 8 5 Re c e ive rs
5/MAX3096
P a c k a g e In fo rm a t io n
______________________________________________________________________________________ 11
±1 5 k V ES D-P ro t e c t e d , 1 0 Mb p s , 3 V/5 V,
Qu a d RS -4 2 2 /RS -4 8 5 Re c e ive rs
P a c k a g e In fo rm a t io n (c o n t in u e d )
5/MAX3096
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12 ____________________Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 4 0 8 -7 3 7 -7 6 0 0
© 1998 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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