PDF《SN54AC245, SN74AC245》

1995 ? REVISED OCTOBER

2003 3 POST OFFICE BOX

655303 ? DALLAS, TEXAS

75265 recommended operating conditions (see Note 3) SN54AC245 SN74AC245 UNIT MIN MAX MIN MAX UNIT VCC Supply voltage

2 6

2 6 V VCC =

3 V 2.1 2.1 VIH High-level input voltage VCC = 4.5 V 3.15 3.15 V VIH High level input voltage VCC = 5.5 V 3.85 3.85 V VCC =

3 V 0.9 0.9 VIL Low-level input voltage VCC = 4.5 V 1.35 1.35 V VIL Low level input voltage VCC = 5.5 V 1.65 1.65 V VI Input voltage

0 VCC

0 VCC V VO Output voltage

0 VCC

0 VCC V VCC =

3 V ?12 ?12 IOH High-level output current VCC = 4.5 V ?24 ?24 mA IOH High level output current VCC = 5.5 V ?24 ?24 mA VCC =

3 V

12 12 IOL Low-level output current VCC = 4.5 V

24 24 mA IOL Low level output current VCC = 5.5 V

24 24 mA Dt/Dv Input transition rise or fall rate

8 8 ns/V TA Operating free-air temperature ?55

125 ?40

85 °C NOTE 3: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report, Implications of Slow or Floating CMOS Inputs, literature number SCBA004. SN54AC245, SN74AC245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCAS461F ? FEBRUARY

1995 ? REVISED OCTOBER

2003 4 POST OFFICE BOX

655303 ? DALLAS, TEXAS

75265 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS V TA = 25°C SN54AC245 SN74AC245 UNIT PARAMETER TEST CONDITIONS VCC MIN TYP MAX MIN MAX MIN MAX UNIT

3 V 2.9 2.9 2.9 IOH = ?50 mA 4.5 V 4.4 4.4 4.4 IOH

50 mA 5.5 V 5.4 5.4 5.4 V IOH = ?12 mA

3 V 2.56 2.4 2.46 V VOH I

24 mA 4.5 V 3.86 3.7 3.76 V IOH = ?24 mA 5.5 V 4.86 4.7 4.76 IOH = ?50 mA? 5.5 V 3.85 IOH = ?75 mA? 5.5 V 3.85

3 V 0.002 0.1 0.1 0.1 IOL =

50 mA 4.5 V 0.001 0.1 0.1 0.1 IOL

50 mA 5.5 V 0.001 0.1 0.1 0.1 V IOL =

12 mA

3 V 0.36 0.5 0.44 V VOL I

24 mA 4.5 V 0.36 0.5 0.44 V IOL =

24 mA 5.5 V 0.36 0.5 0.44 IOL =

50 mA? 5.5 V 1.65 IOL =

75 mA? 5.5 V 1.65 I A or B ports? V V or GND

5 5 V ±0.1 ±1 ±1 A II OE or DIR VI = VCC or GND 5.5 V ±0.1 ±1 ±1 mA IOZ VO = VCC or GND, VI(OE) = VIL or VIH 5.5 V ±0.5 ±10 ±5 mA ICC VI = VCC or GND, IO =

0 5.5 V

4 80

40 mA Ci VI = VCC or GND

5 V 4.5 pF Cio VO = VCC or GND

5 V

15 pF ? Not more than one output should be tested at a time, and the duration of the test should not exceed

2 ms. ? For I/O ports, the parameter IOZ includes the input leakage current. switching characteristics over recommended operating free-air temperature range, VCC = 3.3 V 0.3 V (unless otherwise noted) (see Figure 1) PARAMETER FROM TO TA = 25°C SN54AC245 SN74AC245 UNIT PARAMETER FROM (INPUT) TO (OUTPUT) MIN TYP MAX MIN MAX MIN MAX UNIT tPLH A or B B or A 1.5

5 8.5

1 11.5

1 9 ns tPHL A or B B or A 1.5

5 8.5

1 10

1 9 ns tPZH OE A or B 2.5

7 11.5

1 13.5

2 12.5 ns tPZL OE A or B 2.5 7.5

12 1 14.5

2 13.5 ns tPHZ OE A or B

2 6.5

12 1 13.5

1 12.5 ns tPLZ OE A or B

2 7 11.5

1 14 1.5

13 ns SN54AC245, SN74AC245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCAS461F ? FEBRUARY

1995 ? REVISED OCTOBER

2003 5 POST OFFICE BOX

655303 ? DALLAS, TEXAS

75265 switching characteristics over recommended operating free-air temperature range, VCC =

5 V

5 V (unless otherwise noted) (see Figure 1) PARAMETER FROM TO TA = 25°C SN54AC245 SN74AC245 UNIT PARAMETER FROM (INPUT) TO (OUTPUT) MIN TYP MAX MIN MAX MIN MAX UNIT tPLH A or B B or A 1.5 3.5 6.5

1 8.5

1 7 ns tPHL A or B B or A 1.5 3.5

6 1 7.5

1 7 ns tPZH OE A or B 1.5