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MAX3320A Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX3320A Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 12 page _______________General Description The MAX3320 combines a microprocessor (µP) super- visory 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 pre- set 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 compara- tor 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. ________________________Applications Palmtop Computers Portable/Battery-Powered Equipment Hand-Held Equipment Peripherals Printers ____________________________Features o Precise Monitoring of 5V and 3.3V Power- Supply Voltages: — 100ms (min) Power-On RESET Pulse Width — Power-Supply Transient Immunity — Guaranteed RESET Valid to VCC = 1V o 4µA Supply Current Achieved with AutoShutdown Plus o Receivers Always Active o Power-On Reset Always Active o 4µA Low-Power Shutdown o 250kbps Guaranteed Data Rate 3V to 5.5V, up to 250kbps True RS-232 Transceiver with 4µA AutoShutdown Plus and Power-On Reset ________________________________________________________________ Maxim Integrated Products 1 20 19 18 17 16 15 14 13 1 2 3 4 5 6 7 8 C1+ VCC C1- GND V- C2- C2+ V+ TOP VIEW T1OUT T2OUT R1IN R2IN R2OUT R1OUT T2IN T1IN 12 11 9 10 FORCEON FORCEOFF RESET INVALID MAXxxx SSOP MAX3320 __________________Pin Configuration 19-1253; Rev 0; 8/97 PART* MAX3320_CAP MAX3320_EAP -40°C to +85°C 0°C to +70°C TEMP. RANGE PIN-PACKAGE 20 SSOP 20 SSOP ______________Ordering Information * This part offers a choice of reset threshold voltage. From the table below, select the suffix corresponding to the desired threshold and insert it into the blank to complete the part number. AutoShutdown Plus is a trademark of Maxim Integrated Products. SUFFIX A B RESET THRESHOLD (V) 4.25 2.85 L 4.63 T 3.08 Typical Operating Circuit appears at end of data sheet. For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468. |
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