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MAX3320A, MAX3320B, MAX3320L, MAX3320T
3V to 5.5V, Up to 250kbps True RS-232 Transceiver with 4µA AutoShutdown Plus and Power On Reset
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Status
Active: In Production.
Description
The MAX3320 combines a microprocessor (µP) supervisory circuit with an RS-232 transceiver. The power-on reset performs a single function: it asserts a reset signal whenever the VCC supply voltage declines below a preset threshold, staying asserted for at least 100ms after VCC rises above the reset threshold. The MAX3320 has an active-low RESET output, which is guaranteed to be in the correct state for VCC down to 1V. The reset comparator is designed to ignore fast transients on VCC. Reset thresholds suitable for operation with a variety of supply voltages are available.
The MAX3320 transceivers have a proprietary low-dropout transmitter output stage, enabling true RS-232 performance with a dual charge pump powered from a +3V to +5.5V supply. The device requires only four small 0.1µF external charge-pump capacitors, and is guaranteed to run at data rates of up to 250kbps. It comes in the space-saving 20-pin SSOP package.
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Data Sheet
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Key Features
- Precise Monitoring of 5V and 3.3V Power-Supply Voltages:
- 100ms (min) Power-On active-low RESET Pulse Width
- Power-Supply Transient Immunity
- Guaranteed active-low RESET Valid to VCC = 1V
- 4µA Supply Current Achieved with AutoShutdown Plus™
- Receivers Always Active
- Power-On Reset Always Active
- 4µA Low-Power Shutdown
- 250kbps Guaranteed Data Rate
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Applications/Uses
- Handheld Equipment
- Palmtop Computers
- Peripherals
- Portable Battery-Powered Equipment
- Printers
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Key Specifications:
| RS-232 Line Driver/Receivers |
| Part Number |
VSUPPLY
(V) |
Tx |
Rx |
Data Rate
(kbps) |
ICC
(mA) |
Internal Charge Pump |
Ext. Caps |
Cap. Value
(µF) |
Rx Active in Shutdn |
Package/Pins |
Budgetary Price |
| min |
typ |
nom |
See Notes |
| MAX3320 |
|
2 |
2 |
250 |
0.45 |
Yes |
4 |
0.1 |
2 |
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$2.02 @1k |
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See All RS-232 Line Driver/Receivers (152)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
 Typical Operating Circuit
Notes and Comments
AutoShutdown Plus, On-Board Reset Voltage Monitor
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Information Index
Document Ref.: 19-1253
Rev 0;
1997-08-01
This page last modified: 2007-07-19
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