DS14185 Datasheet, PDF (3/8 Pages) National Semiconductor (TI) – EIA/TIA-232 3 Driver x 5 Receiver

Electrical Characteristics (Note 2) (Continued)
Over recommended supply voltage and operating temperature ranges, unless otherwise specified.
Symbol
Parameter
Conditions
RECEIVER CHARACTERISTICS
V_TH
Input High Threshold
V_O ≤ 0.4V, I_O = 3.2 mA
(Recognized as a High Signal)
V_TL
Input Low Threshold
V_O ≥ 2.5V, I_O = −0.5 mA
(Recognized as a Low Signal)
R_IN
I_IN
V_OH
V_OL
I_OSR
Input Resistance
Input Current (Note 2)
High Level Output Voltage
(Note 7)
Low Level Output Voltage
Short Circuit Current (Note 2)
V_IN = ±3V to ±15V
V_IN = +15V
V_IN = +3V
V_IN = −15V
V_IN = −3V
I_OH = −0.5 mA, V_IN = −3V
I_OH = −10 µA, V_IN = −3V
I_OH = −0.5 mA, V_IN = Open Circuit
I_OH = −10 µA, V_IN = Open Circuit
I_OL = 3.2 mA, V_IN = +3V
V_O = 0V, V_IN = 0V
Min Typ Max Units
1.85 2.4 V
0.7 1.0
V
3.0 4.1 7.0 kΩ
2.1 4.1 5.0 mA
0.43 0.7 1 mA
−5.0 −4.1 −2.1 mA
−1 −0.65 −0.43 mA
2.6 4
V
4.0 4.9
V
2.6 4
V
4.0 4.9
V
0.2 0.4 V
−4 −2.7 −1.7 mA
Switching Characteristics (Note 2)
T_A = 25˚C
Symbol
Parameter
Conditions
Min
Typ
Max Units
DRIVER CHARACTERISTICS
t_PHL
Propagation Delay High to Low
t_PLH
Propagation Delay Low to High
t_r, t_f
Output Slew Rate (Note 8)
RECEIVER CHARACTERISTICS
R_L = 3 kΩ, C_L = 50 pF
(Figures 1, 2)
60
350
ns
240
350
ns
50
ns
t_PHL
Propagation Delay High to Low
R_L = 1.5 kΩ, C_L = 15 pF
t_PLH
Propagation Delay Low to High
(includes fixture plus probe),
t_r
Rise Time
(Figures 3, 4)
t_f
Fall Time
150
350
ns
240
350
ns
87
175
ns
40
100
ns
Note 1: Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices
should be operated at these limits. The table of Electrical Characteristics specifies conditions of device operation.
Note 2: Current into device pins is defined as positive. Current out of device pins is defined as negative. All voltages are referenced to ground unless otherwise speci-
fied. For current, minimum and maximum values are specified as an absolute value and the sign is used to indicate direction. For voltage logic levels, the more posi-
tive value is designated as maximum. For example, if −6V is a maximum, the typical value (−6.8V) is more negative.
Note 3: All typicals are given for: V_CC = +5.0V, V⁺ = +12.0V, V^− = −12V, T_A = +25˚C.
Note 4: Only one driver output shorted at a time.
Note 5: Generator characteristics for driver input: f = 64 kHz (128 kbits/sec), t_r = t_f < 10 ns, V_IH = 3V, V_IL = 0V, duty cycle = 50%.
Note 6: Generator characteristics for receiver input: f = 64 kHz (128 kbits/sec), t_r = t_f = 200 ns, V_IH = 3V, V_IL = −3V, duty cycle = 50%.
Note 7: If receiver inputs are unconnected, receiver output is a logic high.
Note 8: Refer to typical curves. Driver output slew rate is measured from the +3.0V to the −3.0V level on the output waveform. Inputs not under test are connected
to V_CC or GND. Slew rate is determined by load capacitance. To comply with a 30 V/µs maximum slew rate, a minimum load capacitance of 390 pF is recommended.
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