MC34C87 查看數據表（PDF） - Motorola => Freescale

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MC34C87

Quad EIA-422-A line driver

Motorola => Freescale 

AC CHARACTERISTICS (VCC = 4.5 to 5.5 V, TA = – 40 to + 85°C, unless otherwise stated)

Parameter

Symbol

Min

Typ

Propagation Delay Input to Output (S1 Open)

tPLH

—

6

tPHL

Output Skew (S1 Open)*

Skew

—

1.0

Differential Output

Rise Time

Fall Time (S1 Open)

tTLH

—

4

tTHL

Output Enable Time

(S1 Closed)

tPZH

—

16

tPZL

—

15

Output Disable Time

(S1 Closed)

tPHZ

—

6

tPLZ

—

9

* Skew: difference in propagation delays between complementary outputs.

AC TEST CIRCUIT AND SWITCHING TIME WAVEFORMS

Max

Unit

12

ns

4

ns

8

ns

—

ns

—

—

ns

—

INPUT

47 pF

1.5 V

47 pF 49.9 Ω

499 Ω

S1

47 pF 49.9 Ω

Figure 1. AC Test Circuit

3V—

ENABLE INPUT

1.5 V

0V

tPLZ

tPZL

OUTPUT A

VOL + 0.5 V

OUTPUT B

tPHZ

tPZH

VOH – 0.5 V

1.5 V

— 1.5 V

0.8 V

VOL

VOH

2.0 V

— 1.5 V

Figure 3. Enable and Disable Times

3V—

INPUT

0V

1.5 V

tPLH

OUTPUT A

1.5 V

OUTPUT B

SKEW

tPHL

1.5 V

tPHL

tPLH

1.5 V

— VOH

1.5 V

VOL

VOH

1.5 V

— VOL

Figure 2. Propagation Delays and Skew Waveforms

3V—

INPUT

0V

OUTPUT

(DIFFERENTIAL)

90%

10%

tTLH

90%

10%

tTHL

Figure 4. Differential Rise and Fall Times

ENABLE

DATA

TYPICAL APPLICATIONS

+

–

DATA

OUTPUT

Figure 5. Two–Wire Balanced Systems (EIA–422–A)

MOTOROLA

MC34C87

3

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