19-1727; Rev 0; 7/00
±15kV ESD-Protected, 32Mbps, 3V/5V,
Triple RS-422/RS-485 Receivers with Fault Detection
Features
o Detects the Following RS-485 Faults:
Open-Circuit Condition
Short-Circuit Condition
Low Differential Voltage Signal
Common-Mode Range Violation
The fault circuitry includes a capacitor-programmable
delay to ensure that there are no erroneous fault conditions even at slow edge rates. Each receiver is capable
of accepting data at rates up to 32Mbps.
o Single +3V to +5.5V Operation
________________________Applications
o Independent and Universal Fault Outputs
RS-485/RS-422 Receivers for Motor-Shaft
Encoders
High-Speed, Triple RS-485/RS-422 Receiver with
Extended Electrostatic Discharge (ESD)
o ESD Protection
±15kV—Human Body Model
±15kV—IEC 1000-4-2, Air-Gap Discharge
Method
±8kV—IEC 1000-4-2, Contact Discharge Method
o -10V to +13.2V Extended Common-Mode Range
o Capacitor-Programmable Delay of Fault Indication
Allows Error-Free Operation at Slow Data Rates
o 32Mbps Data Rate
o 16-Pin QSOP is 40% Smaller than IndustryStandard 26LS31/32 Solutions
Ordering Information
Triple RS-485/RS-422 Receiver with Input Fault
Indication
PART
Telecommunications
PINPACKAGE
TEMP. RANGE
Embedded Systems
MAX3097ECEE
16 QSOP
MAX3097ECSE
Typical Application Circuit
0°C to +70°C
0°C to +70°C
16 SO
Ordering Information continued at end of data sheet.
ENCODED SIGNALS
Pin Configuration
A, A, B, B, Z, Z
TOP VIEW
MAX3097E
MAX3098E
RECEIVER
OUTPUTS
A 1
ALARM
OUTPUTS
DSP
8
MOTOR
A 2
MOTOR
CONTROLLER
16 VCC
15 ALARMA
B 3
14 OUTA
B 4
Z 5
MAX547
12-BIT D/A
MAX3097E
MAX3098E
Z 6
13 ALARMB
12 OUTB
11 ALARMZ
GND 7
10 OUTZ
DELAY 8
9
ALARMD
MOTOR DRIVER
QSOP/SO/DIP
________________________________________________________________ Maxim Integrated Products
1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAX3097E/MAX3098E
General Description
The MAX3097E/MAX3098E feature three high-speed RS485/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.
The MAX3097E/MAX3098E indicate when a receiver
input is in an open-circuit condition, short-circuit condition, 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 threshold values.
