Datasheet

(MAX225, V
CC
= +5.0V ±5%; MAX244–MAX249, V
CC
= +5.0V ±10%, external capacitors C1–C4 = 1μF; T
A
= T
MIN
to T
MAX
; unless
otherwise noted.) (Note 7)
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 V
CC
=
0V is 10MΩ as is implied by the leakage specification.
PARAMETER CONDITIONS MIN TYP MAX UNITS
POWER SUPPLY AND CONTROL LOGIC
Supply Voltage Range
MAX225 4.75 5.25
V
MAX244–MAX249 4.5 5.5
V
CC
Supply Current
(Normal Operation)
No load
MAX225 10 20
mA
MAX244–MAX249 11 30
3kΩ loads on
all outputs
MAX225 40
MAX244–MAX249 57
Shutdown Supply Current
T
A
= +25°C 8 25
T
A
= T
MIN
to T
MAX
50
Control Input
Leakage current ±1 µA
Logic-low voltage 1.4 0.8
V
Logic-high voltage 2.4 1.4
AC CHARACTERISTICS
Transition Slew Rate
C
L
= 50pF to 2500pF, R
L
= 3kΩ to 7kΩ, V
CC
= +5V,
T
A
= +25°C, measured from +3V to -3V or -3V to +3V
5 10 30 V/μs
Transmitter Propagation Delay
TLL to RS-232 (Normal Operation)
t
PHLT
, Figure 1 1.3 3.5
µs
t
PLHT
, Figure 1 1.3 3.5
Receiver Propagation Delay
TLL to RS-232 (Normal Operation)
t
PHLR
, Figure 2 0.6 1.5
µs
t
PLHR
, Figure 2 0.6 1.5
Receiver Propagation Delay
TLL to RS-232 (Low-Power Mode)
t
PHLS
, Figure 2 0.6 1.5
µs
t
PLHS
, Figure 2 0.6 10
Transmitter + to - Propagation
Delay Di󰀨erence (Normal Operation)
t
PHLT
- t
PLHT
350 ns
Receiver + to - Propagation
Delay Di󰀨erence (Normal Operation)
t
PHLR
- t
PLHR
350 ns
Receiver-Output Enable Time t
ER
, Figure 3 100 500 ns
Receiver-Output Disable Time t
DR
, Figure 3 100 500 ns
Transmitter Enable Time t
ET
MAX246–MAX249
(excludes charge-pump startup)
5 µs
MAX225/MAX245–MAX249
(includes charge-pump startup)
10 ms
Transmitter Disable Time t
DT
, Figure 4 100 ns
MAX220–MAX249 +5V-Powered, Multichannel
RS-232 Drivers/Receivers
www.maximintegrated.com
Maxim Integrated │ 9
Electrical Characteristics—MAX225/MAX244–MAX249 (continued)