MAX13450E_1011 Datasheet, PDF (1/17 Pages) Maxim Integrated Products – RS-485 Transceivers with Integrated 100Ω/120Ω Termination Resistors

19-5254; Rev 1; 11/10
RS-485 Transceivers with Integrated
100Ω/120Ω Termination Resistors
General Description
The MAX13450E/MAX13451E are half-duplex and full-
duplex RS-485/RS-422 transceivers. These devices fea-
ture internal 100I and 120I termination resistors. The
resistor values are pin selectable. A logic supply input
allows interfacing to logic levels down to +1.8V.
The MAX13450E/MAX13451E feature strong drivers
specified to drive low-impedance lines found when a
fully loaded bus, based on today’s 100I characteristic
impedance cable, is doubly terminated. Both devices
allow slew-rate limiting of the driver output to reduce EMI
and reflections for data rates up to 500kbps.
The MAX13451E has a FAULT alarm indication output to
signal to the system that an error condition exists in the
driver. The MAX13451E also features a logic inversion
function. The logic inversion allows phase reversal of the
A-B signals in case these are inadvertently connected
wrongly.
The MAX13450E/MAX13451E have 1/8-unit load receiver
input impedance, allowing up to 256 transceivers on the
bus. All driver outputs are protected to Q30kV ESD using
the Human Body Model (HBM).
The MAX13450E/MAX13451E are available in a 14-pin
TSSOP package and operate over the automotive -40NC
to +125NC temperature range.
Applications
Industrial Control Systems
Portable Industrial Equipment
Motor Control
Security Networks
Medical Networks
Ordering Information/
Selector Guide
PART
HALF/FULL
DUPLEX
PIN-PACKAGE
MAX13450EAUD+
Full
14 TSSOP-EP*
MAX13451EAUD+
Half
14 TSSOP-EP*
Note: All devices are specified over the -40°C to +125°C
operating temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Features
S 100I/120I Pin-Selectable Internal Termination
Resistors
S Driver Drives 100I Double Termination
S 20Mbps (max) Data Rate
S Pin-Selectable Slew-Rate Limiting
S Logic Supply Input Allows Interfacing Down to 1.8V
S Driver Fault-Indication Output (MAX13451E)
S Inverting of A, B Line Polarity (MAX13451E)
S High-Impedance Driver Output/Receiver Input
When VCC Supply is Removed
S Hot-Swap Input Structure on DE, RE, and TERM
S Extended ESD Protection
±30kV Human Body Model
±15kV Air Gap Discharge per IEC 61000-4-2
±7kV Contact Discharge per IEC 61000-4-2
S 1/8-Unit Load Allows Up to 256 Transceivers on
the Bus
S Thermal and Overcurrent Protected
S Fail-Safe Receivers
S +4.5V to +5.5V Supply Voltage Range
Functional Diagram (MAX13451E)
V_L
VCC
SRL
INV
DI
FAULT
DE
TERM
RE
RO
LOGIC-LEVEL
TRANSLATION
D
LOGIC
MAX13451E
B
A
TERM100
GND
________________________________________________________________ Maxim Integrated Products   1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.