MAX232

Part: MAX232 — Texas Instruments

Type: Dual EIA-232 (RS-232) Driver/Receiver with Integrated Charge Pump

Description: Single 5 V supply (4.5–5.5 V), dual TIA/EIA-232-F driver/receiver with on-chip charge pump using 1 μF capacitors, operating up to 120 kbit/s with 8 mA typical supply current.

Operating Conditions:

• Supply voltage: 4.5–5.5 V
• Operating temperature: 0 to 70 °C (MAX232); -40 to 85 °C (MAX232I)
• Receiver input voltage: up to ±30 V
• Driver input levels: VIH ≥ 2 V, VIL ≤ 0.8 V

Absolute Maximum Ratings:

• Max supply voltage (VCC): 6 V
• VS+ output supply: 15 V max; VS- output supply: -15 V
• Receiver input voltage (R1IN, R2IN): ±30 V
• Storage temperature: -65 to 150 °C
• Operating virtual junction temperature: 150 °C

Key Specs:

• Supply current (ICC): 8 mA typical, 10 mA max (VCC = 5.5 V, outputs open, TA = 25 °C)
• Driver output high (VOH): 5 V min, 7 V typical (RL = 3 kΩ to GND)
• Driver output low (VOL): -7 V typical, -5 V max (RL = 3 kΩ to GND)
• Driver short-circuit output current: ±10 mA typical (VCC = 5.5 V, VO = 0 V)
• Receiver thresholds (VCC = 5 V, TA = 25 °C): VIT+ 1.7 V typical (2.4 V max); VIT- 1.2 V typical (0.8 V min)
• Receiver hysteresis: 0.2 V min, 0.5 V typical, 1 V max (VCC = 5 V)
• Receiver input resistance: 3–7 kΩ, 5 kΩ typical (VCC = 5 V, TA = 25 °C)
• Data rate: 120 kbit/s typical; driver slew rate 30 V/μs max; receiver propagation delay 500 ns typical

Features:

• Meets or exceeds TIA/EIA-232-F and ITU V.28
• Single 5 V supply with 1 μF charge-pump capacitors
• Two drivers and two receivers
• ±30 V receiver input levels
• ESD protection exceeds JESD 22 (2000 V HBM)
• Driver outputs protected against short to ground
• Safe to connect to an active remote RS-232 device when unpowered
• MAX202 is an upgrade with 15 kV HBM ESD and 0.1 μF capacitors

Applications:

• TIA/EIA-232-F interfaces
• Battery-powered systems
• Terminals
• Modems
• Computers

Package:

• SOIC (D), 16 pins — 9.9 mm × 6 mm
• SOIC wide (DW), 16 pins — 10.4 mm × 10.3 mm
• PDIP (N), 16 pins — 19.3 mm × 9 mm
• SOP (NS), 16 pins — 10.2 mm × 7.8 mm

• Meets or exceeds TIA/EIA-232-F and ITU recommendation V.28
• Operates from a single 5V power supply with 1μF charge-pump capacitors
• Operates up to 120kbit/s
• Two drivers and two receivers
• ±30V Input levels
• Low supply current: 8mA typical
• ESD protection exceeds JESD 22
• -2000V Human-body model (A114-A)
• Upgrade with improved ESD (15kV HBM) and 0.1μF charge-pump capacitors is available with the MAX202 device

• TIA/EIA-232-F
• Battery-powered systems
• Terminals
• Modems
• Computers

MAX232

SLLS047N - FEBRUARY 1989 - REVISED FEBRUARY 2024

Not to scale

Figure 4-1. MAX232: D, DW, N or NS Package MAX232I: D, DW, or N Package (Top View)

over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) (see Figure 8-1)

over operating free-air temperature range (unless otherwise noted)

For proper operation add capacitors as shown in Figure 8-1. Pins 9 through 12 connect to UART or general purpose logic lines. EIA-232 lines will connect to a connector or cable.

• (1) For more Information, see Section 11 .
• (2) The package size (length × width) is a nominal value and includes pins, where applicable.