DS14C238WM datasheet(3/5 Pages) NSC

3 / 5 page

Switching Characteristics (Note 4)

Over recommended operating conditions, unless otherwise specified.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

DRIVER CHARACTERISTICS

PLH

Propagation Delay LOW to HIGH

L =3k

Ω

0.7

4.0

µs

PHL

Propagation Delay HIGH to LOW

L = 50 pF

0.6

4.0

µs

Skew |t

PLH–tPHL |(Figures 1, 2)

0.1

1.0

µs

SR1

Output Slew Rate

L =3k

Ω to7kΩ,C

L = 50 pF

4.0

V/µs

SR2

Output Slew Rate

L =3k

Ω,C

L = 2500 pF

3.0

5.0

V/µs

RECEIVER CHARACTERISTICS

PLH

Propagation Delay LOW to HIGH

Input Pulse Width > 10 µs

2.0

6.5

µs

PHL

Propagation Delay HIGH to LOW

L = 50 pF

2.8

6.5

µs

Skew | t

PLH–tPHL |(Figures 3, 4)

0.8

2.0

µs

Noise Pulse Width Rejected

(Figures 3, 4)

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

specified.

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=64kHz (128 kbits/sec). Driver AC input waveform for test purposes:

tr =tf ≤ 10 ns, VIH =3V, VIL =0V,f=64kHz (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

01128204

FIGURE 1. Driver Load Circuit

01128205

FIGURE 2. Driver Switching Waveform

01128206

FIGURE 3. Receiver Load Circuit

DS14C238WM Datasheet(PDF) 3 Page - National Semiconductor (TI)

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