- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄9604 > ICL3238ECA-T (Intersil)IC 5DRVR/3RCVR RS232 3V 28-SSOP PDF資料下載
參數(shù)資料
| 型號(hào)： | ICL3238ECA-T |
| 廠商： | Intersil |
| 文件頁數(shù)： | 14/14頁 |
| 文件大小： | 0K |
| 描述： | IC 5DRVR/3RCVR RS232 3V 28-SSOP |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 類型： | 收發(fā)器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 5/3 |
| 規(guī)程： | RS232 |
| 電源電壓： | 3 V ~ 5.5 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-SSOP（0.209"，5.30mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 28-SSOP |
| 包裝： | 帶卷 (TR) |
9
Emulating Standard Automatic Powerdown
If enhanced automatic powerdown isn’t desired, the user can
implement the standard automatic powerdown feature
(mimics the function on the ICL3221, ICL3223, ICL3243E)
by connecting the INVALID output to the FORCEON and
FORCEOFF inputs, as shown in Figure 9. After 60s of
invalid receiver levels, INVALID switches low and drives the
ICL3238E into a forced powerdown condition. INVALID
switches high as soon as a receiver input senses a valid RS-
232 level, forcing the ICL3238E to power on. See the
“INVALID DRIVING FORCEON AND FORCEOFF” section
of Table 2 for an operational summary. This operational
mode is perfect for handheld devices that communicate with
another computer via a detachable cable. Detaching the
cable allows the internal receiver pull-down resistors to pull
the inputs to GND (an invalid RS-232 level), causing the
60
s timer to time-out and drive the IC into powerdown.
Reconnecting the cablerestores valid levels, causing the IC
to power back up.
Hybrid Automatic Powerdown Options
For devices which communicate only through a detachable
cable, connecting INVALID to FORCEOFF (with FORCEON
= 0) may be a desirable configuration. While the cable is
attached INVALID and FORCEOFF remain high, so the
enhanced automatic powerdown logic powers down the RS-
232 device whenever there is 30 seconds of inactivity on the
receiver and transmitter inputs. Detaching the cable allows
the receiver inputs to drop to an invalid level (GND), so
INVALID switches low and forces the RS-232 device to
power down. The ICL3238E remains powered down until the
cable is reconnected (INVALID = FORCEOFF = 1) and a
transition occurs on a receiver or transmitter input (see
Figure 7). For immediate power up when the cable is
reattached, connect FORCEON to FORCEOFF through a
network similar to that shown in Figure 5.
Capacitor Selection
The charge pumps require 0.1F, or greater, capacitors for
3.3V (5% tolerance) operation. For other supply voltages
refer to Table 3 for capacitor values. Do not use values
smaller than those listed in Table 3. Increasing the capacitor
values (by a factor of 2) reduces ripple on the transmitter
outputs and slightly reduces power consumption. C2, C3,
and C4 can be increased without increasing C1’s value,
however, do not increase C1 without also increasing C2, C3,
and C4 to maintain the proper ratios (C1 to the other
capacitors).
RECEIVER
INPUTS
TRANSMITTER
OUTPUTS
INVALID
OUTPUT
V+
VCC
0
V-
tINVL
tINVH
FIGURE 8. ENHANCED AUTOMATIC POWERDOWN, AND INVALID TIMING DIAGRAMS
TRANSMITTER
INPUTS
tWU
tAUTOPWDN
tWU
INVALID
REGION
}
FIGURE 9. CONNECTIONS FOR AUTOMATIC POWERDOWN
WHEN NO VALID RECEIVER SIGNALS ARE
PRESENT
FORCEOF
F
INV
A
LI
D
CPU
I/O
FORCEON
ICL3238E
UART
TABLE 3. REQUIRED CAPACITOR VALUES
VCC (V)
C1 (F)
C2, C3, C4 (F)
3.0 to 3.6 (3.3V
±10%)
0.22
3.15 to 3.6 (3.3V
±5%)
0.1
4.5 to 5.5
0.047
0.33
3.0 to 5.5
0.22
1
ICL3238E
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MS3102E18-31P | CONN RCPT 5POS BOX MNT W/PINS |
| ICL3241ECA | IC 3DRVR/5RCVR RS232 3V 28-SSOP |
| MS3102E18-30P | CONN RCPT 5POS BOX MNT W/PINS |
| ICL3241CV-T | IC 3DRVR/5RCVR RS232 3V 28-TSSOP |
| MS27473T16B42P | CONN PLUG 42POS STRAIGHT W/PINS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICL3238ECAZ | 功能描述:RS-232接口集成電路 RS232 3V 5D/3R 15KV E-DWN COM RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| ICL3238ECAZ-T | 功能描述:RS-232接口集成電路 RS232 3V 5D/3R 15KV E-DWN COMEL RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| ICL3238ECB | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ICL3238ECV | 制造商:Rochester Electronics LLC 功能描述:RS232 3V 5D/3R 15KV E-DWN 28TSSOP COM - Bulk |
| ICL3238EIA | 功能描述:IC 5DRVR/3RCVR RS232 3V 28-SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:25 系列:- 類型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:4.5 V ~ 5.5 V 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:16-PDIP 包裝:管件 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。