19-1727; Rev 0; 7/00
±±15k EꢀDꢁ-rotected, 32Mbps, 3k/1k,
Triple Rꢀꢁ422/Rꢀꢁ481 Receivers with Fault Detection
General Description
Features
The MAX3097E/MAX3098E feature three high-speed RS-
485/RS-422 receivers with fault-detection circuitry and
fault-status outputs. The receivers’ inputs have fault
thresholds that detect when the part is not in a valid state.
ꢀ Detects the Following RS-485 Faults:
Open-Circuit Condition
Short-Circuit Condition
Low Differential Voltage Signal
Common-Mode Range Violation
The MAX3097E/MAX3098E indicate when a receiver
input is in an open-circuit condition, short-circuit condi-
tion, or outside the common-mode range. They also
generate a fault indication when the differential input
voltage goes below a preset threshold. See Ordering
Information or the Electrical Characteristics for thresh-
old values.
ꢀ ESD Protection
±±5ꢀVꢁ—uman ꢂodꢃ Model
±±5ꢀVꢁꢄEC ±111-4-ꢅ2 ꢆir-ꢇap Discharge
Method
±8ꢀVꢁꢄEC ±111-4-ꢅ2 Contact Discharge Method
The fault circuitry includes a capacitor-programmable
delay to ensure that there are no erroneous fault condi-
tions even at slow edge rates. Each receiver is capable
of accepting data at rates up to 32Mbps.
ꢀ Single +3V to +5.5V Operation
ꢀ -±1V to +±3.ꢅV Extended Common-Mode Range
ꢀ Capacitor-Programmable Delaꢃ of Fault ꢄndication
ꢆllows Error-Free Operation at Slow Data Rates
ꢀ ꢄndependent and Universal Fault Outputs
ꢀ 3ꢅMbps Data Rate
________________________Applications
RS-485/RS-422 Receivers for Motor-Shaft
Encoders
ꢀ ±6-Pin QSOP is 41% Smaller than ꢄndustrꢃ-
Standard ꢅ6LS3±/3ꢅ Solutions
High-Speed, Triple RS-485/RS-422 Receiver with
Extended Electrostatic Discharge (ESD)
Triple RS-485/RS-422 Receiver with Input Fault
Indication
Ordering Information
PIN-
PACKAGE
PART
TEMP. RANGE
Telecommunications
Embedded Systems
MAX3097ECEE
0°C to +70°C
0°C to +70°C
16 QSOP
16 SO
MAX3097ECSE
Ordering Information continued at end of data sheet.
Typical Application Circuit
ENCODED SIGNALS
A, A, B, B, Z, Z
-in Configuration
TOP VIEW
MAX3097E
MAX3098E
A
1
2
3
4
5
6
7
8
16 V
CC
A
15 ALARMA
14 OUTA
RECEIVER
OUTPUTS
ALARM
OUTPUTS
B
MOTOR
CONTROLLER
DSP
B
Z
MAX3097E
MAX3098E
13 ALARMB
12 OUTB
8
MOTOR
MAX547
12-BIT D/A
Z
11 ALARMZ
10 OUTZ
GND
DELAY
9
ALARMD
MOTOR DRIVER
QSOP/SO/DIP
________________________________________________________________ Maxim Integrated Products
±
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