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DS14C238 Datasheet, PDF (3/5 Pages) National Semiconductor (TI) – Single Supply TIA/EIA-232 4 x 4 Driver/Receiver
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Switching Characteristics (Note 4)
Over recommended operating conditions, unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
DRIVER CHARACTERISTICS
tPLH
tPHL
tsk
SR1
Propagation Delay LOW to HIGH
Propagation Delay HIGH to LOW
Skew |tPLH–tPHL |
Output Slew Rate
SR2
Output Slew Rate
RECEIVER CHARACTERISTICS
tPLH
Propagation Delay LOW to HIGH
tPHL
Propagation Delay HIGH to LOW
tSK
Skew | tPLH–tPHL |
tNW
Noise Pulse Width Rejected
RL = 3 kΩ
CL = 50 pF
(Figures 1, 2)
RL = 3kΩ to 7 kΩ, CL = 50 pF
RL = 3 kΩ, CL = 2500 pF
Input Pulse Width > 10 µs
CL = 50 pF
(Figures 3, 4)
(Figures 3, 4)
0.7
4.0
µs
0.6
4.0
µs
0.1
1.0
µs
4.0
15
30
V/µs
3.0
5.0
V/µs
2.0
6.5
µs
2.8
6.5
µs
0.8
2.0
µs
2.5
1.0
µs
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 tables of “Electrical Characteristics” specify conditions for 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.
Note 3: IOS+ and IOS− values are for one output at a time. If more than one output is shorted simultaneously, the device power dissipation may be exceeded.
Note 4: Receiver AC input waveform for test purposes: tr = tf = 200 ns, VIH = 3V, VIL = −3V, f = 64 kHz (128 kbits/sec). Driver AC input waveform for test purposes:
tr = tf ≤ 10 ns, VIH = 3V, VIL = 0V, f = 64 kHz (128 kbits/sec).
Note 5: All typicals are given for VCC = 5.0V and TA = +25˚C.
Note 6: Ratings apply to ambient temperature at +25˚C. Above this temperature derate: WM package 13.5 mW/˚C.
Parameter Measurement Information
DS011282-4
FIGURE 1. Driver Load Circuit
FIGURE 2. Driver Switching Waveform
DS011282-5
DS011282-6
FIGURE 3. Receiver Load Circuit
3
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