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參數(shù)資料
| 型號(hào)： | MAX3319EEAE+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 2/15頁 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232 460KBPS 16-SSOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,000 |
| 類型： | 收發(fā)器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 1/1 |
| 規(guī)程： | RS232 |
| 電源電壓： | 2.25 V ~ 3 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SSOP（0.209"，5.30mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SSOP |
| 包裝： | 帶卷 (TR) |
MAX3316–MAX3319
2.5V, 1A, 460kbps,
RS-232-Compatible Transceivers
10
______________________________________________________________________________________
When shut down, the device’s charge pumps turn off,
V+ is pulled to VCC, V- is pulled to ground, the transmitter
outputs are high impedance, and READY is driven low.
The time required to exit shutdown is typically 30s
(Figure 2).
By connecting FORCEON to INVALID, the MAX3318/
MAX3319 shut down when no valid receiver level is
detected and wake up when a valid receiver level is
detected.
A system with AutoShutdown Plus may need time to
wake up. Figure 5 shows a circuit that forces the trans-
mitters on for 100ms, allowing enough time for the other
system to realize that the MAX3318/MAX3319 is awake.
If the other system outputs valid RS-232 signal transi-
tions within that time, the RS-232 ports on both systems
remain enabled.
Connecting to the PC
(MAX3318/MAX3319)
If direct software control is desired, use INVALID to
indicate DTR or ring indicator (RI) signal. This can be
used to connect a hand-held device to a PC. One
example is using the hot sync function on a personal
digital assistant (PDA). The transmitter and receiver
signals (T_OUT and R_IN) are used for communication,
while INVALID causes a change of state on RI. The
change of state on RI will trigger an interrupt on the PC
and allow communication to begin between the device
and the PC. This eliminates the need for the PC to poll
constantly the receiver or transmitter lines to determine
if the device is connected.
Applications Information
RS-232-Compatible Operation
The MAX3316–MAX3319 do not meet EIA-232 require-
ments for transmitter output voltage levels. EIA-232 com-
pliance specifies transmitter output voltage swings of
±5V when loaded with 3k
and 2500pF.
The receiver inputs are fully EIA-232 compliant.
The MAX3316–MAX3319 will function properly with most
modern RS-232 interfaces. This allows RS-232-compati-
ble communication in low-voltage systems without the
added expense of a voltage tripler or switched-mode
power supply.
Capacitor Selection
The capacitor type used for C1–C4 is not critical for
proper operation; polarized or nonpolarized capacitors
can be used. The charge pump requires 0.1F capaci-
tors. 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
+0.3V
-0.3V
INVALID
R_IN
INVALID ASSERTED IF ALL RECEIVER INPUTS ARE BETWEEN +0.3V AND -0.3V FOR
AT LEAST 30
s.
30s
TIMER
R
Figure 3a. INVALID Functional Diagram, INVALID Low
+2.7V
-2.7V
INVALID
R_IN
INVALID DEASSERTED IF ANY RECEIVER INPUT HAS BEEN BETWEEN +2.7V AND -2.7V
FOR LESS THAN 30
s.
30s
TIMER
R
Figure 3b. INVALID Functional Diagram, INVALID High
RECEIVER
INPUT
LEVELS
-2.7V
-0.3V
+2.7V
+0.3V
0
INDETERMINATE
INVALID HIGH
INVALID LOW
INVALID HIGH
INDETERMINATE
Figure 4a. Receiver Positive/Negative Thresholds for INVALID
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