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MAX3320TEAP+ Datasheet

  • MAX3320TEAP+

  • RS-232 Transceiver IC; Device Type:Line Driver/Receiver; No....

  • 12頁

  • Maxim   Maxim

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3V to 5.5V, up to 250kbps True RS-232 Transceiver
with 4碌A(chǔ) AutoShutdown Plus and Power-On Reset
MAX3320A/B/L/T
INVALID
REGION
RECEIVER
INPUTS
VOLTAGE
TRANSMITTER
INPUTS
VOLTAGE
TRANSMITTER
OUTPUTS
VOLTAGE
INVALID
OUTPUT
V
CC
0
V+
V
CC
0
V-
* ALL RECEIVER/TRANSMITTER INPUTS INACTIVE
** ANY ONE RECEIVER/TRANSMITTER INPUT BECOMES ACTIVE
I
NVL
t
AUTOSHDN
t
AUTOSHDN
t
WU
t
WU
*
**
FORCEON = GND, FORCEOFF = V
CC
Figure 3a. AutoShutdown Plus and
INVALID
Timing Diagram
INVALID HIGH
2.7V
RECEIVER INPUT LEVELS
INDETERMINATE
0.3V
0V
-0.3V
INDETERMINATE
-2.7V
INVALID HIGH
INVALID LOW
can drift to undefined voltages. This presents no prob-
lem in most applications, since most 碌Ps and other cir-
cuitry is inoperative with V
CC
below 1V. However, in
applications where
RESET
must be valid down to 0V,
add a pull-down resistor to ground, holding
RESET
low
(Figure 4). R1鈥檚 value is not critical; 100k鈩?is large
enough not to load
RESET,
and small enough to pull it
to ground.
Capacitor Selection
The capacitor type used for C1鈥揅4 is not critical for
proper operation; use either polarized or nonpolarized
capacitors. The charge pump requires 0.1碌F 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
BYPASS
, to maintain the proper ratios (C1 to
the other capacitors).
Figure 3b. Receiver Positive/Negative Thresholds for
INVALID
__________Applications Information
When V
CC
falls below 1V,
RESET
no longer sinks cur-
rent: it becomes an open circuit. Therefore, high-
impedance CMOS logic inputs connected to
RESET
Ensuring a Valid Reset Output
Down to V
CC
= 0V
8
_______________________________________________________________________________________

MAX3320TEAP+ 產(chǎn)品屬性

  • Lead (SnPb) Finish for COTSObsolescence Mitigation Program

  • 66

  • 集成電路 (IC)

  • 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器

  • -

  • 收發(fā)器

  • 2/2

  • RS232

  • 3 V ~ 5.5 V

  • 表面貼裝

  • 20-SSOP（0.209"，5.30mm 寬）

  • 20-SSOP

  • 管件

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