MAX3078EEPA+ Maxim Integrated Products, MAX3078EEPA+ Datasheet - Page 18

• Manufacturer Part Number: MAX3078EEPA+
• Description: IC TXRX RS485/422 8-DIP
• Manufacturer: Maxim Integrated Products
• Type: Transceiverr

Specifications of MAX3078EEPA+

• Number Of Drivers/receivers: 1/1
• Protocol: RS422, RS485
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Data Rate: 16 Mbps
• Operating Supply Voltage: 3.3 V
• Supply Current: 0.8 mA
• Operating Temperature Range: - 40 C to + 85 C
• Maximum Power Dissipation: 727 mW
• Mounting Style: Through Hole
• Device Type: Transceiver
• Ic Interface Type: RS422, RS485
• No. Of Drivers: 1
• Supply Voltage Range: 2.97V To 3.63V
• Driver Case Style: DIP
• No. Of Pins: 8
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Low-power shutdown mode is initiated by bringing both
RE high and DE low. In shutdown, the devices typically
draw only 50nA of supply current.
RE and DE can be driven simultaneously; the parts are
guaranteed not to enter shutdown if RE is high and DE
is low for less than 50ns. If the inputs are in this state
for at least 600ns, the parts are guaranteed to enter
shutdown.
Enable times t
Characteristics section) assume the part was not in a
low-power shutdown state. Enable times t
t
drivers and receivers longer to become enabled from
low-power shutdown mode (t
from driver/receiver-disable mode (t
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
Figure 11. Line Repeater for MAX3070E/MAX3071E/MAX3073E/
MAX3074E/MAX3076E/MAX3077E/MAX3079E in Full-Duplex
Mode
Figure 12. Typical Half-Duplex RS-485 Network
18
ZL(SHDN)
______________________________________________________________________________________
RO
DE
RE
DI
RO
DE
RE
DI
Low-Power Shutdown Mode (Except
MAX3079E (HALF-DUPLEX)
assume the parts were shut down. It takes
MAX3071E/MAX3074E/MAX3077E)
D
R
D
MAX3072E
MAX3075E
MAX3078E
ZH
R
A
B
Z
Y
and t
MAX3070E/MAX3071E/MAX3073E/
MAX3074E/MAX3076E/MAX3077E/
120Ω
120Ω
MAX3079E (FULL-DUPLEX)
ZL
ZH(SHDN)
B
A
(see the Switching
120Ω
ZH
, t
, t
ZL
ZL(SHDN)
B
DI
ZH(SHDN)
).
DATA IN
DATA OUT
D
A
DE
) than
and
RO
R
RE
Two mechanisms prevent excessive output current and
power dissipation caused by faults or by bus contention.
The first, a foldback current limit on the output stage,
provides immediate protection against short circuits over
the whole common-mode voltage range (see the Typical
Operating Characteristics ). The second, a thermal-shut-
down circuit, forces the driver outputs into a high-imped-
ance state if the die temperature becomes excessive.
The RS-485/RS-422 standard covers line lengths up to
4000ft. For line lengths greater than 4000ft, use the
repeater application shown in Figure 11.
The MAX3072E/MAX3075E/MAX3078E/MAX3079E
transceivers are designed for bidirectional data commu-
nications on multipoint bus transmission lines. Figures
12 and 13 show typical network applications circuits.
To minimize reflections, terminate the line at both ends
in its characteristic impedance, and keep stub lengths
off the main line as short as possible. The slew-rate-lim-
ited MAX3072E/MAX3075E and the two modes of the
MAX3079E are more tolerant of imperfect termination.
TRANSISTOR COUNT: 1228
PROCESS: BiCMOS
B
DI
D
A
DE
120Ω
RO
R
RE
Driver Output Protection
B
A
Chip Information
Typical Applications
R
D
Line Length
DE
DI
RO
RE