+5V-Powered, Multichannel RS-232
Drivers/Receivers
ELECTRICAL CHARACTERISTICS—MAX225/MAX244–MAX249 (continued)
(MAX225, V
= 5.0V ±5ꢀ; MAX244–MAX249, V
= +5.0V ±±0ꢀ, external capacitors C±–C4 = ±µꢁ; T = T
to T
; unless oth-
MAX
CC
CC
A
MIN
erwise noted.)
PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
POWER SUPPLY AND CONTROL LOGIC
MAX225
4.75
4.5
5.25
V
Operating Supply Voltage
MAX244–MAX249
MAX225
5.5
±0
±±
40
57
8
20
No load
MAX244–MAX249
MAX225
30
V
CC
Supply Current
mA
(normal operation)
3kΩ loads on
all outputs
MAX244–MAX249
T
T
= +25°C
25
µA
50
A
Shutdown Supply Current
Control Input
= T
to T
MAX
A
MIN
Leakage current
Threshold low
Threshold high
±±
µA
±.4
±.4
0.8
V
2.4
5
AC CHARACTERISTICS
C = 50pꢁ to 2500pꢁ, R = 3kΩ to 7kΩ, V = 5V,
L
A
L
CC
Transition Slew Rate
±0
30
V/µs
µs
T = +25°C, measured from +3V to -3V or -3V to +3V
Transmitter Propagation Delay
TLL to RS-232 (normal operation),
ꢁigure ±
t
t
t
t
t
t
±.3
±.5
0.6
0.6
0.6
3.0
3.5
3.5
±.5
±.5
±0
PHLT
PLHT
PHLR
PLHR
PHLS
PLHS
Receiver Propagation Delay
TLL to RS-232 (normal operation),
ꢁigure 2
µs
µs
Receiver Propagation Delay
TLL to RS-232 (low-power mode),
ꢁigure 2
±0
Transmitter + to - Propagation
Delay Difference (normal operation)
t
- t
350
350
ns
ns
PHLT PLHT
Receiver + to - Propagation
Delay Difference (normal operation)
t
- t
PHLR PLHR
Receiver-Output EnableTime, ꢁigure 3
Receiver-Output DisableTime, ꢁigure 3
t
t
±00
±00
500
500
ns
ns
ER
DR
MAX246–MAX249
(excludes charge-pump start-up)
5
µs
Transmitter Enable Time
t
t
ET
MAX225/MAX245–MAX249
(includes charge-pump start-up)
±0
ms
ns
Transmitter Disable Time, ꢁigure 4
±00
DT
Note 5: The 300Ω minimum specification complies with EIA/TIA-232E, but the actual resistance when in shutdown mode or V
0V is ±0MΩ as is implied by the leakage specification.
=
CC
_______________________________________________________________________________________
9
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
