MAX214CWI-T Maxim Integrated, MAX214CWI-T Datasheet - Page 7

• Manufacturer Part Number: MAX214CWI-T
• Description: RS-232 Interface IC
• Manufacturer: Maxim Integrated
• Series: MAX214r

Specifications of MAX214CWI-T

• Data Rate: 116 Kbps
• Operating Supply Voltage: 5 V
• Supply Current: 20 mA
• Operating Temperature Range: 0 C to + 70 C
• Mounting Style: SMD/SMT
• Function: Transceiver
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Number Of Drivers: 3
• Number Of I/os: 16
• Number Of Receivers: 5
• Propagation Delay Time Ns: 3.5 us, 1.5 us
• Shutdown: Yes

Figure 1. MAX214 Shutdown-Current Test Circuit
Figure 2. Charge-Pump Diagram
0V OR +5.5V
CAPACITORS MAY BE
POLARIZED OR UNPOLARIZED
+5.5V
DRIVE
1µF
1µF
1µF
+5.5V
+5.5V
+5.5V
GND
V CC
_______________________________________________________________________________________
I
SHDN
C1+
C1-
C2+
C2-
T
R
DTE/DCE
HI-Z
SHDN
IN
OUT
S3
S1
+5V
400k
Rx
MAX214
GND
V
CC
Tx
C1+
C1-
120kHz
C1
T
OUT
S2
R
S4
5k
V+
V-
IN
+5.5V
1µF
1µF
C3
V CC
3k
V+
I L +
Programmable DTE/DCE,
+5V RS-232 Transceiver
With V
is ±8V when loaded with a nominal 5kΩ RS-232
receiver. Under worst-case operating conditions
(including 116kbps data rate, 3kΩ
V
swing is guaranteed to meet the ±5V minimum speci-
fied by EIA/TIA-232 and V.28. The open-circuit output
voltage swing ranges from (V+ - 0.6V) to V-.
Input thresholds are both CMOS and TTL compatible.
The inputs of unused drivers can be left unconnected
because 400kΩ pull-up resistors to V
on-chip. Since all drivers invert, the pull-up resistors
force the outputs of unused drivers low. The input
pull-up resistors typically source 10µA; in shutdown
mode, they are disconnected to reduce supply current.
When in low-power shutdown mode, the driver outputs
are turned off and their leakage current is less than
1µA, even if the transmitter output is back-driven with
voltages up to ±15V.
The receivers convert the RS-232 signals to
CMOS-logic levels. They invert, to match the inversion
of RS-232 drivers. The guaranteed receiver input
thresholds are significantly tighter than the ±3V
thresholds required by the EIA/TIA-232E specification,
R L +
CC
S7
S5
= 4.5V, maximum rated temperature) the output
CC
C2+
= 5V, the typical driver output voltage swing
C2-
C2
S6
S8
C4
I L -
RS-232 Receivers
RS-232 Drivers
R L -
CC
GND
V -
2500pF load,
are included
7