MAX232CPE Datasheet – RS-232 Drivers / Receivers – Maxim

This IC is dual driver/receiver.

Part Number : MAX232CPE

Function : +5V-Powered, Multichannel RS-232 Drivers/Receiver

Package : 16 Pin DIP Type

Manufacturers : Maxim Integrated




Description :

The MAX220 Thru MAX249 family of line drivers/receivers is intended for all EIA/TIA-232E and V.28/V.24 communications interfaces, particularly applications where ±12V is not available.

These parts are especially useful in battery-powered systems, since their low-power shutdown mode reduces power dissipation to less than 5µW. The MAX225, MAX233, MAX235, and MAX245/MAX246/MAX247 use no external components and are recommended for applications where printed circuit board space is critical.

The MAX220-MAX249 are offered in 26 different packages with temperatures from 0 to +70°C up to -55°C to +125°C. See ordering information table at the end of the data sheet for all package and temperature options.
max232 Datasheet Selection Table


1. Battery-Powered RS-232 Systems
2. Interface Translation
3. Low-Power Modems
4. Multidrop RS-232 Networks
6. Portable Computing

MAX232CPE Drivers

The typical driver output voltage swing is ±8V when loaded with a nominal 5kΩRS-232 receiver and VCC= +5V. Output swing is guaranteed to meet the EIA/TIA-232E and V.28 specification, which calls for ±5V minimum driver output levels under worst-case conditions. These include a minimum 3kΩload, VCC= +4.5V, and maximum operating temperature. Unloaded driver output voltage ranges from (V+ -1.3V) to (V- +0.5V).





MAX232CPE Receivers

EIA/TIA-232E and V.28 specifications define a voltage level greater than 3V as a logic 0, so all receivers invert. Input thresholds are set at 0.8V and 2.4V, so receivers respond to TTL level inputs as well as EIA/TIA-232E and V.28 levels. The receiver inputs withstand an input overvoltage up to ±25V and provide input terminating resistors with nominal 5kΩ values. The receivers implement Type 1 interpretation of the fault conditions of V.28 and EIA/TIA-232E.

Reference Site : [ Wikipedia MAX232 Info ]

MAX232CPE Datasheet PDF

MAX232 pdf


Other data sheets within the file : MAX220 Thru MAX249, MAX222C-D, MAX223C-D

CL1501 Datasheet – Non-isolated Buck Offline LED Driver

This is one of the LED Driver types.

Part Number : CL1501

Function : Non-isolated Step-Down LED Constant Current Driver

Package : SOP-8 Pin Type

Manufacturers : Chiplink ( )

See the preview image and the PDF file for more information.



Description :

CL1501 is a high performance step-down constant current driver IC, can achieve high precision constant current LED driver. The chip works in the inductor current Pro Continuous mode (TM), the working voltage covering 85Vac ~ 265Vac. Integrated 500V power devices within the chip, peripheral applications without auxiliary winding inspection Measurement and power supply to achieve high precision constant current, greatly reducing the external cost.

CL1501 has a variety of constant current auxiliary function, to achieve excellent linear compensation and high precision constant current effect. CL1501 work in the critical continuous inductor current Mode (TM), the output current does not change with the change in inductance and load, with excellent load regulation characteristics.

CL1501 integrates a variety of protection features, greatly enhancing the reliability of the system. Protection features include LED open-circuit protection, LED short-circuit protection, and under-voltage protection Voltage lock, current sampling resistor short-circuit protection and over-temperature regulation.


CL1501 pinout




1. Wide input voltage
2. ± 5% LED output current accuracy
3. Internal integrated 500V power tube
4. chip ultra-low operating current
5. Inductor current critical continuous mode (TM)
6. No auxiliary winding
7. Excellent line voltage regulation and load regulation
8. LED on / short circuit protection
9. current sampling resistor short-circuit protection
10. Undervoltage Lockout (UVLO)
11. Over temperature adjustment function


CL1501 Datasheet