Maxim MAX3096CSE, MAX3095EEE, MAX3095CSE, MAX3095CPE, MAX3095CEE Datasheet

...
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________________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.
________________________Applications
Telecommunications Equipment Rugged RS-422/RS-485/RS-423 Bus Receiver Receivers for ESD-Sensitive Applications Level Translators
____________________________Features
ESD Protection:
±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 RateAllow up to 128 Receivers on the Bus1nA Low-Power Shutdown Mode2.4mA Operating Supply CurrentPin-Compatible Upgrades to ’26LS32
MAX3095/MAX3096
±15kV ESD-Protected, 10Mbps, 3V/5V,
Quad RS-422/RS-485 Receivers
________________________________________________________________
Maxim Integrated Products
1
16 15 14 13 12 11 10
9
1 2 3 4 5 6 7 8
B1 V
CC
B4 A4 Y4 G Y3 A3 B3
TOP VIEW
MAX3095 MAX3096
DIP/SO/QSOP
A1 Y1
A2
G
Y2
B2
GND
Pin Configuration
Y1
Y2
Y3
Y4
A1 B1 A2 B2 A3 B3
A4 B4
MAX3095 MAX3096
V
CC
GND
G G
________________Functional Diagram
19-0498; Rev 0; 3/98
PART
MAX3095CPE
MAX3095CSE MAX3095CEE 0°C to +70°C
0°C to +70°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
16 Plastic DIP 16 Narrow SO 16 QSOP
_______________Ordering Information
MAX3095EPE MAX3095ESE MAX3095EEE -40°C to +85°C
-40°C to +85°C
-40°C to +85°C 16 Plastic DIP 16 Narrow SO 16 QSOP
MAX3096CPE MAX3096CSE MAX3096CEE 0°C to +70°C
0°C to +70°C
0°C to +70°C 16 Plastic DIP
16 Narrow SO 16 QSOP
MAX3096EPE MAX3096ESE MAX3096EEE -40°C to +85°C
-40°C to +85°C
-40°C to +85°C 16 Plastic DIP 16 Narrow SO 16 QSOP
MAX3095/MAX3096
±15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS—MAX3095
(VCC= 5V ±5%, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
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.
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 (V
CC
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
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
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, 10sec).............................+300°C
V
CM
= 0
IEC1000-4-2 (Contact Discharge)
-7V VCM≤ 12V
IEC1000-4-2 (Air-Gap Discharge)
Human Body Model
-7V VCM≤ 12V
0 V
OUT
VCC, G = VCCor G = GND
0 V
OUT
VCC, G = GND and G = V
CC
I
OUT
= 4mA, VID= -200mV,
G = V
CC
or G = GND, Figure 1
G = GND and G = V
CC
I
OUT
= -4mA, VID= 200mV,
G = V
CC
or G = GND, Figure 1
No load, G = VCCor G = GND
CONDITIONS
±8
±15
kV
±15
ESD Protection (Note 2)
µA0.001 10
mA2.4 3.5
I
CC
Supply Current
mV45
mV-200 200V
TH
Receiver Differential Input Threshold
Receiver Input Hysteresis
k48R
IN
Receiver Input Resistance
mA±7 ±75I
OSR
Output Short-Circuit Current
µA±1I
OZR
Three-State Current at Receiver Output
V0.4V
OL
Receiver Output Low Voltage
µA±1
Enable Input Current (G, G)
V2.0V
IH
Enable Input High Voltage (G, G)
V0.8V
IL
Enable Input Low Voltage (G, G)
VVCC- 1.5V
OH
Receiver Output High Voltage
UNITSMIN TYP MAXSYMBOLPARAMETER
µA
250
I
IN
Receiver Input Current (A_, B_) VCC= 0 or 5.25V
VIN= 12V
-200VIN= -7V
MAX3095/MAX3096
±15kV ESD-Protected, 10Mbps, 3V/5V,
Quad RS-422/RS-485 Receivers
_______________________________________________________________________________________ 3
DC ELECTRICAL CHARACTERISTICS—MAX3096
(VCC= 3.0V to 3.6V, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at VCC= 3.3V, TA= +25°C.) (Note 1)
SWITCHING CHARACTERISTICS—MAX3095
(VCC= 5V ±5%, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.)
VCC= 5V ±5%, TA= T
MIN
to T
MAX
Figure 3
Figure 3
|VID| = 3V, Figure 2, matched conditions
|VID| = 3V,
Figure 2
Figure 3
Figure 3
CONDITIONS
Mbps10f
MAX
Maximum Data Rate
ns60 100t
HZ
Output Disable Time from High Level
ns60 100t
LZ
Output Disable Time from Low Level
78 86 94
ns
65 98
t
PLH
, t
PHL
Input-to-Output Propagation Delay
ns600 800t
ZH
Output Enable Time to High Level
ns600 800t
ZL
Output Enable Time to Low Level
ns16
Device-to-Device Propagation­Delay Matching
68 76 84
71 79 87 65 73 81 82 90 98 74 82 90
UNITSMIN TYP MAXSYMBOLPARAMETER
VCM= 0
-7V VCM≤ 12V
-7V VCM≤ 12V
0 V
OUT
VCC, G = VCCor G = GND
0 V
OUT
VCC, G = GND and G = V
CC
I
OUT
= 2.5mA, VID= -200mV,
G = V
CC
or G = GND, Figure 1
I
OUT
= -1.5mA, VID= 200mV,
G = V
CC
or G = GND, Figure 1
CONDITIONS
mV45
mV-200 200V
TH
Receiver Differential Input Threshold
Receiver Input Hysteresis
k48R
IN
Receiver Input Resistance
mA±4 ±60I
OSR
Output Short-Circuit Current
µA±1I
OZR
Three-State Current at Receiver Output
V0.4V
OL
Receiver Output Low Voltage
µA±1
Enable Input Current (G, G)
V2.0V
IH
Enable Input High Voltage (G, G)
V0.8V
IL
Enable Input Low Voltage (G, G)
VVCC- 0.4V
OH
Receiver Output High Voltage
UNITSMIN TYP MAXSYMBOLPARAMETER
µA
250
I
IN
Receiver Input Current (A_, B_) VCC= 0 or 3.6V
VIN= 12V
-200VIN= -7V
ns-4 ±10t
SK
Propagation-Delay Skew (t
PLH
- t
PHL
)
TA= +85°C TA= +25°C TA= -40°C TA= +85°C TA= +25°C TA= -40°C
VCC= 5.25V
VCC= 4.75V
MAX3095/MAX3096
±15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers
4 _______________________________________________________________________________________
IEC1000-4-2 (Contact Discharge)
IEC1000-4-2 (Air-Gap Discharge)
Human Body Model
G = GND and G = V
CC
No load, G = VCCor G = GND
CONDITIONS
±8
±15
kV
±15
ESD Protection (Note 2)
µA0.001 10
mA2.4 4.0
I
CC
Supply Current
UNITSMIN TYP MAXSYMBOLPARAMETER
DC ELECTRICAL CHARACTERISTICS—MAX3096 (continued)
(VCC= 3.0V to 3.6V, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at VCC= 3.3V, TA= +25°C.) (Note 1)
|VID| = 3V,
Figure 2
VCC= 3.0V to 3.6V, TA= T
MIN
to T
MAX
Figure 3
Figure 3
|VID| = 3V, Figure 2, matched conditions
Figure 3
Figure 3
CONDITIONS
Mbps10f
MAX
Maximum Data Rate
ns80 180t
HZ
Output Disable Time from High Level
ns80 180t
LZ
Output Disable Time from Low Level
88 98 108
ns
69 123
t
PLH
, t
PHL
Input-to-Output Propagation Delay
ns600 1000t
ZH
Output Enable Time to High Level
ns600 1000t
ZL
Output Enable Time to Low Level
ns20
Device-to-Device Propagation­Delay Matching
82 92 102
78 88 98 69 79 89
103 113 123
91 101 111
UNITSMIN TYP MAXSYMBOLPARAMETER
SWITCHING CHARACTERISTICS—MAX3096
(VCC= 3.0V to 3.6V, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.)
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_).
ns-2 ±10t
SK
Propagation-Delay Skew (t
PLH
- t
PHL
)
TA= +85°C TA= +25°C TA= -40°C TA= +85°C TA= +25°C TA= -40°C
VCC= 3.60V
VCC= 3.00V
MAX3095/MAX3096
±15kV ESD-Protected, 10Mbps, 3V/5V,
Quad RS-422/RS-485 Receivers
_______________________________________________________________________________________
5
0
-10
-20
-30
-40
-50
0 21 3 4 5
OUTPUT CURRENT vs.
OUTPUT LOW VOLTAGE
MAX3095-01
OUTPUT LOW VOLTAGE (V)
OUTPUT CURRENT (mA)
MAX3095
MAX3096
0
15
10
5
20
25
30
0 21 3 4 5
OUTPUT CURRENT vs.
OUTPUT HIGH VOLTAGE
MAX3095-02
OUTPUT HIGH VOLTAGE (V)
OUTPUT CURRENT (mA)
MAX3095
MAX3096
0
0.3
0.2
0.1
0.4
0.5
0.6
0.7
0.8
0.9
1.0
-40 10-15 35 60 85
OUTPUT LOW VOLTAGE
vs. TEMPERATURE
MAX3095-03
TEMPERATURE (°C)
OUTPUT LOW VOLTAGE (V)
MAX3095
MAX3096
I
OUT
= 8mA
0
1
3
2
4
5
-40 10-15 35 60 85
OUTPUT HIGH VOLTAGE
vs. TEMPERATURE
MAX3095-04
TEMPERATURE (°C)
OUTPUT HIGH VOLTAGE (V)
MAX3095
MAX3096
I
OUT
= -8mA
70
80
100
90
110
120
-40 10-15 35 60 85
MAX3095
PROPAGATION DELAY vs. TEMPERATURE
MAX3095-07
TEMPERATURE (°C)
PROPAGATION DELAY (ns)
VID = 3V C
L
= 15pF
2.0
2.2
2.6
2.4
2.8
3.0
-40 10-15 35 60 85
SUPPLY CURRENT vs. TEMPERATURE
MAX3095-05
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
MAX3095/MAX3096
0
5
10
15
20
-40 10-15 35 60 85
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX3095-06
TEMPERATURE (°C)
SHUTDOWN SUPPLY CURRENT (nA)
MAX3095
MAX3096
80
110
100
90
120
130
140
-40 10-15 35 60 85
MAX3096
PROPAGATION DELAY vs. TEMPERATURE
MAX3095-08
TEMPERATURE (°C)
PROPAGATION DELAY (ns)
VID = 3V C
L
= 15pF
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
6 _______________________________________________________________________________________
Pin Description
NAME FUNCTION
1 B1 Inverting Receiver Input 2 A1 Noninverting Receiver Input
PIN
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.
8 GND Ground
7 B2 Inverting Receiver Input
6 A2 Noninverting Receiver Input
5 Y2 Receiver Output. Same functionality as Y1.
13 Y4 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.
11 Y3 Receiver Output. Same functionality as Y1.
10 A3 Noninverting Receiver Input
9 B3 Inverting Receiver Input
TIME (200ns/div)
SHUTDOWN TIMING
MAX3095 TOC09
MAX3095
Y VOLTAGE
5V/div
2V/div
2V/div
MAX3096
Y VOLTAGE
G VOLTAGE
CIRCUIT OF FIGURE 3, S1 OPEN, S2 CLOSED, S3 = 1V
Typical Operating Characteristics (continued)
(VCC= 5V for MAX3095, VCC= 3.3V for MAX3096, TA= +25°C, unless otherwise noted.)
14 A4 Noninverting Receiver Input 15 B4 Inverting Receiver Input 16 V
CC
Positive Supply
MAX3095/MAX3096
±15kV ESD-Protected, 10Mbps, 3V/5V,
Quad RS-422/RS-485 Receivers
_______________________________________________________________________________________ 7
R
V
OH
I
OH
(-)
I
OL
(+)
V
OL
V
ID
Figure 2. Receiver Propagation Delay
Figure 1. Receiver V
OH
and V
OL
3V
0
V
OH
0
1.5V
OUT
0.25V
G
1.5V1.5V
S1 OPEN S2 CLOSED S3 = 1V
3V
0
G
t
HZ
1.5V
t
ZL
t
ZH
V
CC
V
OL
0.25V
OUT
S1 CLOSED S2 OPEN S3 = -1V
t
LZ
C
L
15pF
R
+1V
-1V
V
CC
V
ID
V
CC
S1
S2
1k
S3
G
G
Figure 3. Receiver Enable and Disable Times
OUT
C
L
15pF
t
PHL
V
ID
R
RR
or G = GND
1.5V
1.5V 1.5V
OUT
V
= 3V
|
|
ID
G = V
CC
IN
t
PLH
1.5V
3.0V
0V
V
0V
CC
_______________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
1.5kresistor.
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.
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.
MAX3095/MAX3096
±15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers
Table 1. Function Table
OUTPUTYDEVICE
MODE
G
GG
(A - B)
On
1 X 200mV 1 On 1 X -200mV 0 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
8 _______________________________________________________________________________________
MAX3095/MAX3096
±15kV ESD-Protected, 10Mbps, 3V/5V,
Quad RS-422/RS-485 Receivers
_______________________________________________________________________________________ 9
CHARGE-CURRENT
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE CAPACITOR
C
s
150pF
R
C
50M to 100M
R
D
330
HIGH-
VOLTAGE
DC
SOURCE
DEVICE UNDER
TEST
Figure 5a. IEC 1000-4-2 ESD Test Model
Figure 5b. IEC 1000-4-2 ESD-Generator Current Waveform
Figure 4b. Human Body Model Current Waveform
IP 100%
90%
36.8%
t
RL
TIME
t
DL
CURRENT WAVEFORM
PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE)
I
r
10%
0
0
AMPERES
Figure 4a. Human Body ESD Test Model
R
D
1.5k
DISCHARGE
RESISTANCE
STORAGE CAPACITOR
HIGH-
VOLTAGE
DC
SOURCE
R
C
1M
CHARGE-CURRENT
LIMIT RESISTOR
C
100pF
s
DEVICE UNDER
TEST
I
100%
90%
PEAK
I
10%
tr = 0.7ns to 1ns
30ns
60ns
t
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.
128 Receivers on the Bus
The standard RS-485 input impedance is 12k(one­unit load). The standard RS-485 transmitter can drive 32 unit loads. The MAX3095/MAX3096 present a 1/4­unit-load input impedance (48k), 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.
MAX3095/MAX3096
±15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers
10 ______________________________________________________________________________________
1k
1k
150
MAX3095 MAX3096
V
CC
A
B
Figure 6. External Fail-Safe Implementation
TRANSISTOR COUNT: 676
Chip Information
MAX3095/MAX3096
±15kV ESD-Protected, 10Mbps, 3V/5V,
Quad RS-422/RS-485 Receivers
______________________________________________________________________________________ 11
Package Information
QSOP.EPS
MAX3095/MAX3096
±15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers
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
© 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
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
© 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
PDIPN.EPS
SOICN.EPS
Package Information (continued)
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