Datasheet MAX220-MAX249 (Maxim) - 9

MAX220–MAX249 +5V-Powered, Multichannel RS-232 Drivers/Receivers
Electrical Characteristics—MAX225/MAX244–MAX249 (continued)
(MAX225, VCC = +5.0V ±5%; MAX244–MAX249, VCC = +5.0V ±10%, external capacitors C1–C4 = 1µF; TA = TMIN to TMAX; unless otherwise noted.) (Note 7)
PARAMETER CONDITIONS MIN TYP MAX UNITS POWER SUPPLY AND CONTROL LOGIC
MAX225 4.75 5.25 Supply Voltage Range V MAX244–MAX249 4.5 5.5 MAX225 10 20 No load V MAX244–MAX249 11 30 CC Supply Current mA (Normal Operation) 3kΩ loads on MAX225 40 all outputs MAX244–MAX249 57 TA = +25°C 8 25 Shutdown Supply Current µA TA = TMIN to TMAX 50 Leakage current ±1 µA Control Input Logic-low voltage 1.4 0.8 V Logic-high voltage 2.4 1.4
AC CHARACTERISTICS
C Transition Slew Rate L = 50pF to 2500pF, RL = 3kΩ to 7kΩ, VCC = +5V, 5 10 30 V/µs TA = +25°C, measured from +3V to -3V or -3V to +3V tPHLT, Figure 1 1.3 3.5 Transmitter Propagation Delay µs TLL to RS-232 (Normal Operation) tPLHT, Figure 1 1.5 3.5 tPHLR, Figure 2 0.6 1.5 Receiver Propagation Delay µs TLL to RS-232 (Normal Operation) tPLHR, Figure 2 0.6 1.5 tPHLS, Figure 2 0.6 10 Receiver Propagation Delay µs TLL to RS-232 (Low-Power Mode) tPLHS, Figure 2 3.0 10 Transmitter + to - Propagation t 350 ns Delay Difference (Normal Operation) PHLT - tPLHT Receiver + to - Propagation t Delay Difference (Normal Operation) PHLR - tPLHR 350 ns Receiver-Output Enable Time tER, Figure 3 100 500 ns Receiver-Output Disable Time tDR, Figure 3 100 500 ns MAX246–MAX249 5 µs (excludes charge-pump startup) Transmitter Enable Time tET MAX225/MAX245–MAX249 10 ms (includes charge-pump startup) Transmitter Disable Time tDT, Figure 4 100 ns
Note 7:
All units production tested at hot. Specifications over temperature are guaranteed by design.
Note 8:
The 300Ω minimum specification complies with EIA/TIA-232E, but the actual resistance when in shutdown mode or VCC = 0V is 10MΩ as is implied by the leakage specification. www.maximintegrated.com Maxim Integrated | 9