Overview
The MAX3238IPWQ1 is a multichannel RS-232 line driver/receiver produced by Texas Instruments. This device is designed to provide the electrical interface between notebook and subnotebook computer applications, adhering to the TIA/EIA-232-F and ITU v.28 standards. It features five line drivers and three line receivers, along with a dual charge-pump circuit that enables operation from a single 3-V to 5.5-V supply. The MAX3238IPWQ1 also includes an always-active noninverting output (ROUT1B) for ring indicator applications and offers ±15-kV ESD protection using the Human-Body Model (HBM).
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Supply Voltage (VCC) | 3 | - | 5.5 | V |
| Operating Free-Air Temperature (TA) | -40 | - | 85 | °C |
| Driver and Control High-Level Input Voltage (VIH) | 2.4 | - | - | V |
| Driver and Control Low-Level Input Voltage (VIL) | 0.8 | - | - | V |
| Receiver Input Voltage | -25 | - | 25 | V |
| Data Signaling Rate | - | - | 250 kbit/s | - |
| Driver Output Slew Rate | - | - | 30 V/µs | - |
| Supply Current (ICC) - Powered Off | 1 | - | 10 | µA |
| Supply Current (ICC) - Auto-Powerdown Plus Enabled | 1 | - | 10 | µA |
Key Features
- Five line drivers and three line receivers.
- Dual charge-pump circuit allowing operation from a single 3-V to 5.5-V supply.
- ±15-kV ESD protection using the Human-Body Model (HBM) for serial-port connection pins, including GND.
- Always-active noninverting output (ROUT1B) for ring indicator applications.
- Supports data signaling rates up to 250 kbit/s and a maximum driver output slew rate of 30 V/µs.
- Low standby current: 1 µA typical.
- Accepts 5-V logic input with 3.3-V supply.
- Auto-powerdown plus feature to reduce power consumption.
Applications
- Battery-powered systems.
- PDAs, notebooks, subnotebooks, laptops, and palmtop PCs.
- Hand-held equipment.
- Modems and printers.
Q & A
- What is the operating voltage range of the MAX3238IPWQ1?
The MAX3238IPWQ1 operates from a single 3-V to 5.5-V supply.
- How many line drivers and receivers does the MAX3238IPWQ1 have?
The device features five line drivers and three line receivers.
- What is the ESD protection level of the MAX3238IPWQ1?
The device offers ±15-kV ESD protection using the Human-Body Model (HBM).
- What is the maximum data signaling rate supported by the MAX3238IPWQ1?
The device supports data signaling rates up to 250 kbit/s.
- Does the MAX3238IPWQ1 have an auto-powerdown feature?
Yes, the device includes an auto-powerdown plus feature to reduce power consumption.
- What is the purpose of the always-active noninverting output (ROUT1B)?
The always-active noninverting output (ROUT1B) allows applications using the ring indicator to transmit data while the device is powered down.
- What are the typical applications of the MAX3238IPWQ1?
The device is typically used in battery-powered systems, PDAs, notebooks, subnotebooks, laptops, palmtop PCs, hand-held equipment, modems, and printers.
- What is the operating temperature range of the MAX3238IPWQ1?
The device operates over an operating free-air temperature range of -40°C to 85°C.
- How many external capacitors are required for the MAX3238IPWQ1?
The device requires four small external capacitors for operation.
- What is the typical standby current of the MAX3238IPWQ1?
The typical standby current is 1 µA.
