19-0498; Rev 1; 10/00
±15kV ESD-Protected, 10Mbps, 3V/5V,
Quad RS-422/RS-485 Receivers
____________________________Features
o ESD Protection:
±15kV—IEC 1000-4-2, Air-Gap Discharge
±8kV—IEC 1000-4-2, Contact Discharge
±15kV—Human Body Model
o Guaranteed Propagation-Delay Tolerance
Between All ICs:
±8ns (MAX3095)
±10ns (MAX3096)
o Single +3V Operation (MAX3096)
Single +5V Operation (MAX3095)
o 16-Pin QSOP (8-pin SO footprint)
o 10Mbps Data Rate
o Allow up to 128 Receivers on the Bus
o 1nA Low-Power Shutdown Mode
o 2.4mA Operating Supply Current
o Pin-Compatible Upgrades to ’26LS32
________________________Applications
Telecommunications Equipment
Rugged RS-422/RS-485/RS-423 Bus Receiver
Receivers for ESD-Sensitive Applications
Level Translators
________________Functional Diagram
VCC
G
_______________Ordering Information
PART
MAX3095CPE
MAX3095CSE
MAX3095CEE
MAX3095EPE
MAX3095ESE
MAX3095EEE
MAX3096CPE
MAX3096CSE
MAX3096CEE
MAX3096EPE
MAX3096ESE
MAX3096EEE
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
MAX3095
MAX3096
G
PIN-PACKAGE
16 Plastic DIP
16 Narrow SO
16 QSOP
16 Plastic DIP
16 Narrow SO
16 QSOP
16 Plastic DIP
16 Narrow SO
16 QSOP
16 Plastic DIP
16 Narrow SO
16 QSOP
Pin Configuration
A1
Y1
TOP VIEW
B1
B1 1
16 VCC
A2
A1 2
15 B4
Y1 3
14 A4
Y2
B2
G 4
A3
Y3
B3
Y2 5
MAX3095
MAX3096
13 Y4
12 G
A2 6
A4
Y4
B4
11 Y3
B2 7
10 A3
GND 8
GND
9
B3
DIP/SO/QSOP
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
MAX3095/MAX3096
________________General Description
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 10004-2 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 propagation delays are guaranteed to within ±8ns of a predetermined value, thereby ensuring device-to-device
matching across production lots.
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.
The MAX3095/MAX3096 are pin-compatible, low-power
upgrades to the industry-standard ’26LS32. They are
available in a space-saving QSOP package.
MAX3095/MAX3096
±15kV ESD-Protected, 10Mbps, 3V/5V,
Quad RS-422/RS-485 Receivers
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC) ...............................................................7V
Control Input Voltage (G, G).......................-0.3V to (VCC + 0.3V)
Receiver Input Voltage (A_, B_)...........................................±25V
Receiver Output Voltage (Y_).....................-0.3V to (VCC + 0.3V)
Continuous Power Dissipation (TA = +70°C)
16-Pin Plastic DIP (derate 10.5mW/°C above +70°C) .762mW
16-Pin SO (derate 8.7mW/°C above +70°C)................696mW
16-Pin QSOP (derate 8.3mW/°C above +70°C)...........667mW
Operating Temperature Ranges
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, 10s) .................................+300°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 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
(VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
Receiver Differential Input
Threshold
SYMBOL
VTH
Receiver Input Hysteresis
Receiver Input Current (A_, B_)
CONDITIONS
MIN
-7V ≤ VCM ≤ 12V
VCC = 0 or 5.25V
MAX
UNITS
200
-200
VCM = 0
IIN
TYP
mV
45
mV
VIN = 12V
250
VIN = -7V
-200
Enable Input Current (G, G)
±1
Enable Input High Voltage (G, G)
VIH
Enable Input Low Voltage (G, G)
VIL
2.0
µA
µA
V
0.8
V
Receiver Output High Voltage
VOH
IOUT = -4mA, VID = 200mV,
G = VCC or G = GND, Figure 1
Receiver Output Low Voltage
VOL
IOUT = 4mA, VID = -200mV,
G = VCC or G = GND, Figure 1
0.4
V
Three-State Current at Receiver
Output
IOZR
0 ≤ VOUT ≤ VCC, G = GND and G = VCC
±1
µA
Output Short-Circuit Current
IOSR
0 ≤ VOUT ≤ VCC, G = VCC or G = GND
±7
±75
mA
Receiver Input Resistance
RIN
-7V ≤ VCM ≤ 12V
48
Supply Current
ICC
No load, G = VCC or G = GND
G = GND and G = VCC
VCC - 1.5
V
kΩ
2.4
3.5
mA
0.001
10
µA
Human Body Model
2
IEC1000-4-2 (Air-Gap Discharge)
±15
IEC1000-4-2 (Contact Discharge)
ESD Protection
(Note 2)
±15
±8
_______________________________________________________________________________________
kV
±15kV ESD-Protected, 10Mbps, 3V/5V,
Quad RS-422/RS-485 Receivers
(VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
VCC = 5V ±5%, TA = TMIN to TMAX
TYP
65
MAX
98
TA = +85°C
tPLH, tPHL
VCC = 4.75V
Device-to-Device PropagationDelay Matching
94
TA = +25°C
71
79
87
65
73
81
TA = +85°C
Figure 2
86
TA = -40°C
|VID| = 3V,
78
82
90
98
TA = +25°C
74
82
90
TA = -40°C
Input-to-Output Propagation
Delay
VCC = 5.25V
UNITS
68
76
84
|VID| = 3V, Figure 2, matched conditions
ns
16
ns
-4
±10
ns
Propagation-Delay Skew
(tPLH - tPHL)
tSK
Output Enable Time to
Low Level
tZL
Figure 3
600
800
ns
Output Enable Time to
High Level
tZH
Figure 3
600
800
ns
Output Disable Time from
Low Level
tLZ
Figure 3
60
100
ns
Output Disable Time from
High Level
tHZ
Figure 3
60
100
ns
Maximum Data Rate
fMAX
10
Mbps
DC ELECTRICAL CHARACTERISTICS—MAX3096
(VCC = 3.0V to 3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 3.3V, TA = +25°C.) (Note 1)
PARAMETER
Receiver Differential Input
Threshold
SYMBOL
VTH
Receiver Input Hysteresis
Receiver Input Current (A_, B_)
CONDITIONS
MIN
-7V ≤ VCM ≤ 12V
VCC = 0 or 3.6V
MAX
UNITS
200
-200
VCM = 0
IIN
TYP
mV
45
mV
VIN = 12V
250
VIN = -7V
-200
Enable Input Current (G, G)
±1
µA
µA
Enable Input High Voltage (G, G)
VIH
Enable Input Low Voltage (G, G)
VIL
Receiver Output High Voltage
VOH
IOUT = -1.5mA, VID = 200mV,
G = VCC or G = GND, Figure 1
Receiver Output Low Voltage
VOL
IOUT = 2.5mA, VID = -200mV,
G = VCC or G = GND, Figure 1
0.4
V
Three-State Current at Receiver
Output
IOZR
0 ≤ VOUT ≤ VCC, G = GND and G = VCC
±1
µA
Output Short-Circuit Current
IOSR
0 ≤ VOUT ≤ VCC, G = VCC or G = GND
±4
±60
mA
Receiver Input Resistance
RIN
-7V ≤ VCM ≤ 12V
48
2.0
V
0.8
VCC - 0.4
V
V
kΩ
_______________________________________________________________________________________
3
MAX3095/MAX3096
SWITCHING CHARACTERISTICS—MAX3095
MAX3095/MAX3096
±15kV ESD-Protected, 10Mbps, 3V/5V,
Quad RS-422/RS-485 Receivers
DC ELECTRICAL CHARACTERISTICS—MAX3096 (continued)
(VCC = 3.0V to 3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 3.3V, TA = +25°C.) (Note 1)
PARAMETER
Supply Current
SYMBOL
ICC
CONDITIONS
MIN
UNITS
4.0
mA
0.001
G = GND and G = VCC
MAX
2.4
No load, G = VCC or G = GND
TYP
10
µA
Human Body Model
IEC1000-4-2 (Air-Gap Discharge)
±15
IEC1000-4-2 (Contact Discharge)
ESD Protection
(Note 2)
±15
±8
kV
SWITCHING CHARACTERISTICS—MAX3096
(VCC = 3.0V to 3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
VCC = 3.0V to 3.6V, TA = TMIN to TMAX
TYP
69
MAX
123
TA = +85°C
tPLH, tPHL
Device-to-Device PropagationDelay Matching
108
TA = +25°C
78
88
98
69
79
89
TA = +85°C
VCC = 3.00V
98
TA = -40°C
|VID| = 3V,
Figure 2
88
103
113
123
TA = +25°C
91
101
111
TA = -40°C
Input-to-Output Propagation
Delay
VCC = 3.60V
UNITS
82
92
102
|VID| = 3V, Figure 2, matched conditions
ns
20
ns
-2
±10
ns
Propagation-Delay Skew
(tPLH - tPHL)
tSK
Output Enable Time to
Low Level
tZL
Figure 3
600
1000
ns
Output Enable Time to
High Level
tZH
Figure 3
600
1000
ns
Output Disable Time from
Low Level
tLZ
Figure 3
80
180
ns
Output Disable Time from
High Level
tHZ
Figure 3
80
180
ns
Maximum Data Rate
fMAX
10
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
_______________________________________________________________________________________
Mbps
±15kV ESD-Protected, 10Mbps, 3V/5V,
Quad RS-422/RS-485 Receivers
25
OUTPUT CURRENT (mA)
-40
-30
-20
MAX3096
MAX3095
20
0.9
OUTPUT LOW VOLTAGE (V)
MAX3095
1.0
MAX3095-02
30
MAX3095-01
-50
OUTPUT CURRENT (mA)
OUTPUT LOW VOLTAGE
vs. TEMPERATURE
OUTPUT CURRENT vs.
OUTPUT HIGH VOLTAGE
15
10
MAX3096
-10
MAX3095-03
OUTPUT CURRENT vs.
OUTPUT LOW VOLTAGE
IOUT = 8mA
0.8
0.7
0.6
0.5
0.4
MAX3096
0.3
MAX3095
0.2
5
0.1
0
0
0
0
1
2
3
4
0
5
1
2
3
4
-40
5
-15
10
35
60
OUTPUT LOW VOLTAGE (V)
OUTPUT HIGH VOLTAGE (V)
OUTPUT HIGH VOLTAGE
vs. TEMPERATURE
SUPPLY CURRENT vs. TEMPERATURE
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
SUPPLY CURRENT (mA)
2.8
3
MAX3096
2
1
2.6
MAX3095/MAX3096
2.4
2.2
MAX3095-06
20
SHUTDOWN SUPPLY CURRENT (nA)
4
MAX3095-05
MAX3095
15
10
MAX3095
MAX3096
5
IOUT = -8mA
2.0
35
60
85
0
-40
-15
TEMPERATURE (°C)
10
35
60
-40
-15
TEMPERATURE (°C)
VID = 3V
CL = 15pF
110
100
90
80
10
35
60
85
TEMPERATURE (°C)
MAX3095
PROPAGATION DELAY vs. TEMPERATURE
120
85
MAX3096
PROPAGATION DELAY vs. TEMPERATURE
140
130
MAX3095-08
10
PROPAGATION DELAY (ns)
-15
MAX3095-07
-40
PROPAGATION DELAY (ns)
OUTPUT HIGH VOLTAGE (V)
3.0
MAX3095-04
5
0
85
TEMPERATURE (°C)
VID = 3V
CL = 15pF
120
110
100
90
70
80
-40
-15
10
35
TEMPERATURE (°C)
60
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
_______________________________________________________________________________________
5
MAX3095/MAX3096
Typical Operating Characteristics
(VCC = 5V for MAX3095, VCC = 3.3V for MAX3096, TA = +25°C, unless otherwise noted.)
MAX3095/MAX3096
±15kV ESD-Protected, 10Mbps, 3V/5V,
Quad RS-422/RS-485 Receivers
Typical Operating Characteristics (continued)
(VCC = 5V for MAX3095, VCC = 3.3V for MAX3096, TA = +25°C, unless otherwise noted.)
SHUTDOWN TIMING
MAX3095 TOC09
MAX3095
Y VOLTAGE
5V/div
2V/div
MAX3096
Y VOLTAGE
G VOLTAGE
2V/div
TIME (200ns/div)
CIRCUIT OF FIGURE 3,
S1 OPEN, S2 CLOSED, S3 = 1V
_
Pin Description
PIN
1
B1
Inverting Receiver Input
2
A1
Noninverting Receiver Input
3
Y1
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.
4
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
Y2
Receiver Output. Same functionality as Y1.
6
A2
Noninverting Receiver Input
7
B2
Inverting Receiver Input
8
GND
9
B3
Inverting Receiver Input
10
A3
Noninverting Receiver Input
11
Y3
Receiver Output. Same functionality as Y1.
12
G
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.
13
Y4
Receiver Output. Same functionality as Y1.
14
A4
Noninverting Receiver Input
15
B4
Inverting Receiver Input
16
6
NAME
FUNCTION
VCC
Ground
Positive Supply
_______________________________________________________________________________________
±15kV ESD-Protected, 10Mbps, 3V/5V,
Quad RS-422/RS-485 Receivers
VID
MAX3095/MAX3096
|VID| = 3V
OUT
R
CL
15pF
VID
R
G = VCC or G = GND
VOL
VOH
IOL
(+)
IOH
(-)
3.0V
IN
1.5V
1.5V
0V
tPHL
tPLH
VCC
Figure 1. Receiver VOH and VOL
1.5V (MAX3096)
2.0V (MAX3095)
OUT
1.5V (MAX3096)
2.0V (MAX3095)
0
Figure 2. Receiver Propagation Delay
VCC
S1
S3
+1V
G
-1V
VID
VCC
1k
R
S2
CL
15pF
G
3V
G
1.5V
1.5V
3V
G
0
tZH
0
tHZ
tLZ
tZL
VCC
VOH
OUT
0.25V
OUT
1.5V
1.5V
VOL
0
S1 OPEN
S2 CLOSED
S3 = 1V
0.25V
S1 CLOSED
S2 OPEN
S3 = -1V
Figure 3. Receiver Enable and Disable Times
_______________________________________________________________________________________
7
MAX3095/MAX3096
±15kV ESD-Protected, 10Mbps, 3V/5V,
Quad RS-422/RS-485 Receivers
_______________Detailed Description
±15kV ESD Protection
As with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against electrostatic 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 stateof-the-art structures to protect these pins against ±15kV
ESD, without damage. After an ESD event, the MAX3095/
MAX3096 continue working without latchup.
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)
3) ±15kV using the Air-Gap Method specified in
IEC 1000-4-2 (formerly IEC 801-2)
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 discharged 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.
IEC 1000-4-2
Since January 1996, all equipment manufactured and/or
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 integrated 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.
8
The main difference between tests done using the
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 generally 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.
Machine Model
The Machine Model for ESD testing uses a 200pF storage 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.
Low-Power Shutdown Mode
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 impedance 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.
Table 1. Function Table
G
G
(A - B)
OUTPUT
Y
DEVICE
MODE
1
X
≥ 200mV
1
On
1
X
≤ -200mV
0
On
1
X
Open
1
On
X
0
≥ 200mV
1
On
X
0
≤ -200mV
0
On
X
0
Open
1
On
0
1
X
High-Z
Shutdown
X = don’t care, High-Z = high impedance
_______________________________________________________________________________________
±15kV ESD-Protected, 10Mbps, 3V/5V,
Quad RS-422/RS-485 Receivers
CHARGE-CURRENT
LIMIT RESISTOR
HIGHVOLTAGE
DC
SOURCE
Cs
100pF
IP 100%
90%
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Ir
DEVICE
UNDER
TEST
Figure 4a. Human Body ESD Test Model
36.8%
10%
0
HIGHVOLTAGE
DC
SOURCE
Cs
150pF
tDL
CURRENT WAVEFORM
Figure 4b. Human Body Model Current Waveform
RD
330Ω
I
100%
90%
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
TIME
tRL
IPEAK
CHARGE-CURRENT
LIMIT RESISTOR
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
AMPERES
0
RC
50M to 100M
MAX3095/MAX3096
RD
1.5k
RC
1M
DEVICE
UNDER
TEST
10%
tr = 0.7ns to 1ns
t
30ns
60ns
Figure 5a. IEC 1000-4-2 ESD Test Model
Figure 5b. IEC 1000-4-2 ESD-Generator Current Waveform
_______________________________________________________________________________________
9
MAX3095/MAX3096
±15kV ESD-Protected, 10Mbps, 3V/5V,
Quad RS-422/RS-485 Receivers
Applications Information
Propagation-Delay Matching
The MAX3095/MAX3096 exhibit propagation delays that
are closely matched from one device to another, even
between devices from different production lots. This feature allows multiple data lines to receive data and clock
signals with minimal skewing with respect to each other.
The MAX3095 receiver propagation delays are trimmed
to a predetermined value ±8ns, while the MAX3096
delays are trimmed to a predetermined value ±10ns.
VCC
1k
A
MAX3095
MAX3096
150Ω
128 Receivers on the Bus
The standard RS-485 input impedance is 12kΩ (oneunit load). The standard RS-485 transmitter can drive
32 unit loads. The MAX3095/MAX3096 present a 1/4unit-load input impedance (48kΩ), which allows up to
128 receivers on a bus. Any combination of these RS485 receivers with a total of 32 unit loads can be connected to the same bus.
Fail-Safe Implementation
The MAX3095/MAX3096 receiver inputs guarantee a
logic high output when the inputs are open circuit (no
termination resistor used). This occurs when the transmitter 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 differential voltage between the A and B inputs falls below
the ±200mV RS-485 sensitivity threshold. Consequently, the outputs become undefined. To maintain a failsafe 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 recommended.
10
B
1k
Figure 6. External Fail-Safe Implementation
Chip Information
TRANSISTOR COUNT: 676
______________________________________________________________________________________
±15kV ESD-Protected, 10Mbps, 3V/5V,
Quad RS-422/RS-485 Receivers
QSOP.EPS
______________________________________________________________________________________
11
MAX3095/MAX3096
Package Information
±15kV ESD-Protected, 10Mbps, 3V/5V,
Quad RS-422/RS-485 Receivers
PDIPN.EPS
SOICN.EPS
MAX3095/MAX3096
Package Information (continued)
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 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2000 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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