MAX3212CWI-T Maxim Integrated, MAX3212CWI-T Datasheet - Page 6

• Manufacturer Part Number: MAX3212CWI-T
• Description: RS-232 Interface IC
• Manufacturer: Maxim Integrated
• Series: MAX3212r

Specifications of MAX3212CWI-T

• Data Rate: 235 Kbps
• Operating Supply Voltage: 2.7 V to 3.6 V
• Supply Current: 3 mA
• Operating Temperature Range: 0 C to + 70 C
• Function: Transceiver
• Number Of Drivers: 3
• Number Of I/os: 17
• Number Of Receivers: 5
• Propagation Delay Time Ns: 2 us
• Shutdown: Yes

not the absolute voltages. Increasing the size of C1 and
C2 increases the time V+ and V- take to reach their final
value. Bypass V
the MAX3212. Increase this to 4.7 F if there are no other
V
(15cm) away from the MAX3212.
Component suppliers are listed in Table 1.
All three drivers are identical and deliver EIA/TIA-232E
and EIA/TIA-562 output voltage levels when V
tween 2.7V and 3.6V. When FORCEOFF is driven low or
when the AutoShutdown circuitry senses invalid voltage
levels at all receiver inputs, the drivers are disabled
and the outputs are forced into a high-impedance
state.
The MAX3212 receivers convert RS-232 signals to
CMOS-logic output levels. All receivers have one in -
verting three-state output. Receiver 5 also has a com-
plementary (noninverting) output. In shutdown, all five
+2.7V to +3.6V-Powered, 1µA Supply Current,
3-Driver/5-Receiver, True RS-232 Transceiver
Table 1. Suggested Component Suppliers
Table 2. AutoShutdown Logic
6
Diodes
Allegro
Motorola
Philips
Inductors
Murata-Erie
Sumida
TDK
CC
RECEIVER INPUT
RS-232 SIGNAL
PRESENT AT
_______________________________________________________________________________________
supply bypass components less than 6 inches
MANUFACTURER
Yes
Yes
No
No
No
CC
to GND with at least 0.33 F close to
FORCEOFF INPUT
H
H
H
L
L
TMPD6050LT
MMBD6050LT1
PMBD6050
LQH4N150K-TA
CD43150
NLC453232T-150K
RS-232 Receivers
PART NUMBER
RS-232 Drivers
FORCEON
INPUT
CC
H
X
L
X
X
is be-
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INVALID OUTPUT
inverting receivers can be either active or inactive
under logic control.
The complementary output (R5OUTB) is always active,
regardless of the state of EN or the part’s shutdown sta-
tus. R5OUTB can monitor RS-232 activity while the
other receivers are high impedance. This allows Ring
Indicator to be monitored without forward biasing other
devices connected to the receiver outputs. This is ideal
for systems where the UART’s V
down. (See Figure 2.)
The EN input has two functions: It allows enabling/dis-
abling of the receivers, and it is used to reset the transi -
tion detector.
Driving EN low places five inverting receiver outputs
(R_OUT) into a high-impedance state. R5OUTB is
always active, regardless of the state of EN or the part’s
shutdown status (Table 2). EN has no effect on T_OUT.
EN also resets the transition detector. Drive EN high and
then low to reset the TRAN output low. TRAN goes high
when a transition occurs on any receiver input.
H
H
L
L
L
PHONE
Normal Operation
Normal Operation (Forced On)
Shutdown (AutoShutdown)
Shutdown (Forced Off)
Shutdown (Forced Off)
TRANSCEIVER STATUS
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CC
is set to 0V in shut-
Enable Control
FAX