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參數(shù)資料
| 型號： | ICL3226EIA-T |
| 廠商： | Intersil |
| 文件頁數(shù)： | 19/20頁 |
| 文件大小： | 0K |
| 描述： | IC 1DRVR/1RCVR RS232 3V 16-SSOP |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 1/1 |
| 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： | 16-SSOP（0.209"，5.30mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SSOP |
| 包裝： | 帶卷 (TR) |
8
Detailed Description
These ICL32XXE interface ICs operate from a single +3V to
+5.5V supply, guarantee a 250kbps minimum data rate,
require only four small external 0.1
F capacitors, feature low
power consumption, and meet all ElA RS-232C and V.28
specifications. The circuit is divided into three sections: The
charge pump, the transmitters, and the receivers.
Charge-Pump
Intersil’s new ICL32XXE family utilizes regulated on-chip
dual charge pumps as voltage doublers, and voltage
inverters to generate
±5.5V transmitter supplies from a V
CC
supply as low as 3.0V. This allows these devices to maintain
RS-232 compliant output levels over the
±10% tolerance
range of 3.3V powered systems. The efficient on-chip power
supplies require only four small, external 0.1
F capacitors
for the voltage doubler and inverter functions at VCC =3.3V.
See the “Capacitor Selection” section, and Table 3 for
capacitor recommendations for other operating conditions.
The charge pumps operate discontinuously (i.e., they turn off
as soon as the V+ and V- supplies are pumped up to the
nominal values), resulting in significant power savings.
Transmitters
The transmitters are proprietary, low dropout, inverting
drivers that translate TTL/CMOS inputs to EIA/TIA-232
output levels. Coupled with the on-chip
±5.5V supplies, these
transmitters deliver true RS-232 levels over a wide range of
single supply system voltages.
Transmitter outputs disable and assume a high impedance
state when the device enters the powerdown mode (see
Table 2). These outputs may be driven to
±12V when
disabled.
All devices guarantee a 250kbps data rate for full load
conditions (3k
and 1000pF), VCC ≥ 3.0V, with one
transmitter operating at full speed. Under more typical
conditions of VCC ≥ 3.3V, RL =3k, and CL = 250pF, one
transmitter easily operates at 1Mbps.
Transmitter inputs float if left unconnected, and may cause
ICC increases. Connect unused inputs to GND for the best
performance.
Receivers
All the ICL32XXE devices contain standard inverting
receivers, but only the ICL3244E receivers can three-state,
via the FORCEOFF control line. Additionally, the ICL3244E
includes a noninverting (monitor) receiver (denoted by the
ROUTB label) that is always active, regardless of the state of
any control lines. Both receiver types convert RS-232 signals
to CMOS output levels and accept inputs up to
±25V while
presenting the required 3k
to 7k input impedance (see
Figure 1) even if the power is off (VCC = 0V). The receivers’
Schmitt trigger input stage uses hysteresis to increase noise
immunity and decrease errors due to slow input signal
transitions.
Receiver Skew
tPHL - tPLH
25
-
50
-
ns
Transition Region Slew Rate
VCC =3.3V,
RL =3k to 7k,
Measured From 3V to -3V or -3V
to 3V
CL = 150pF to 1000pF
25
6
-
30
V/
s
CL = 150pF to 2500pF
25
4
8
30
V/
s
ESD PERFORMANCE
RS-232 Pins (TOUT, RIN)
Human Body Model
25
-
±15
-
kV
IEC61000-4-2 Contact Discharge
25
-
±8-
kV
IEC61000-4-2 Air Gap Discharge
25
-
±15
-
kV
All Other Pins
Human Body Model
25
-
±3-
kV
NOTE:
2. An “edge” is defined as a transition through the transmitter or receiver input thresholds.
Electrical Specifications
Test Conditions: VCC = 3V to 5.5V, C1 - C4 = 0.1F; Unless Otherwise Specified.
Typicals are at TA = 25°C (Continued)
PARAMETER
TEST CONDITIONS
TEMP
(°C)
MIN
TYP
MAX
UNITS
RXOUT
GND
≤ VROUT ≤ VCC
5k
RXIN
-25V
≤ VRIN ≤ +25V
GND
VCC
FIGURE 1. INVERTING RECEIVER CONNECTIONS
ICL3224E, ICL3226E, ICL3244E
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