MAX3320ACAP+T Maxim Integrated Products, MAX3320ACAP+T Datasheet - Page 8

• Manufacturer Part Number: MAX3320ACAP+T
• Description: IC TXRX RS232 250KBPS 20-SSOP
• Manufacturer: Maxim Integrated Products
• Type: Transceiverr

Specifications of MAX3320ACAP+T

• Number Of Drivers/receivers: 2/2
• Protocol: RS232
• Voltage - Supply: 3 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 20-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

__________Applications Information
When V
rent: it becomes an open circuit. Therefore, high-
impedance CMOS logic inputs connected to RESET
3V to 5.5V, up to 250kbps True RS-232 Transceiver
with 4µA AutoShutdown Plus and Power-On Reset
Figure 3a. AutoShutdown Plus and INVALID Timing Diagram
Figure 3b. Receiver Positive/Negative Thresholds for INVALID
8
_______________________________________________________________________________________
OUTPUT
** ANY ONE RECEIVER/TRANSMITTER INPUT BECOMES ACTIVE
INVALID
-0.3V
-2.7V
* ALL RECEIVER/TRANSMITTER INPUTS INACTIVE
2.7V
0.3V
CC
TRANSMITTER
TRANSMITTER
0V
RECEIVER
OUTPUTS
VOLTAGE
VOLTAGE
VOLTAGE
falls below 1V, RESET no longer sinks cur-
INPUTS
INPUTS
V
V
CC
V+
CC
V-
0
0
Ensuring a Valid Reset Output
I
NVL
INDETERMINATE
INDETERMINATE
*
INVALID HIGH
INVALID HIGH
INVALID LOW
**
Down to V
INVALID
REGION
t
AUTOSHDN
CC
= 0V
can drift to undefined voltages. This presents no prob-
lem in most applications, since most µPs and other cir-
cuitry is inoperative with V
applications where RESET must be valid down to 0V,
add a pull-down resistor to ground, holding RESET low
(Figure 4). R1’s value is not critical; 100k
enough not to load RESET, and small enough to pull it
to ground.
The capacitor type used for C1–C4 is not critical for
proper operation; use either polarized or nonpolarized
capacitors. The charge pump requires 0.1µF capaci-
tors for 3.3V operation. For other supply voltages, refer
to Table 3 for required capacitor values. Do not use val-
ues smaller than those listed in Table 3. Increasing the
capacitor values (e.g., by a factor of 2) reduces ripple
on the transmitter outputs and slightly reduces power
consumption. C2, C3, and C4 can be increased without
changing C1's value. However, do not increase C1
without also increasing the values of C2, C3, C4,
and C
the other capacitors).
t
WU
BYPASS
t
, to maintain the proper ratios (C1 to
AUTOSHDN
FORCEON = GND, FORCEOFF = V
CC
Capacitor Selection
below 1V. However, in
t
WU
CC
is large