PDF《SN74AHC245-EP OCTAL BUS TRANSCEIVER》

655303 ? DALLAS, TEXAS

75265 absolute maximum ratings over operating free-air temperature range (unless otherwise noted)? Supply voltage range, VCC C0.5 V to

7 V Input voltage range, VI (see Note 1): Control inputs C0.5 V to

7 V I/O, output voltage range, VO (see Note 1) C0.5 V to VCC + 0.5 V Input clamp current, IIK (VI <

0): Control inputs C20 mA I/O, output clamp current, IOK (VO <

0 or VO >

VCC) ±20 mA Continuous output current, IO (VO =

0 to VCC) ±25 mA Continuous current through VCC or GND ±75 mA Package thermal impedance, θJA (see Note 2): DW package 58°C/W PW package 83°C/W Storage temperature range, Tstg C65°C to 150°C ? Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTES: 1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed. 2. The package thermal impedance is calculated in accordance with JESD 51-7. recommended operating conditions (see Note 3) MIN MAX UNIT VCC Supply voltage

2 5.5 V VCC =

2 V 1.5 VIH High-level input voltage VCC =

3 V 2.1 V VCC = 5.5 V 3.85 VCC =

2 V 0.5 VIL Low-level input voltage VCC =

3 V 0.9 V VCC = 5.5 V 1.65 VI Input voltage OE or DIR

0 5.5 V VO Output voltage A or B

0 VCC V VCC =

2 V C50 mA IOH High-level output current VCC = 3.3 V ± 0.3 V C4 mA VCC =

5 V ± 0.5 V C8 mA VCC =

2 V

50 mA IOL Low-level output current VCC = 3.3 V ± 0.3 V

4 mA VCC =

5 V ± 0.5 V

8 mA ?t/?v Input transition rise or fall rate VCC = 3.3 V ± 0.3 V

100 ns/V ?t/?v Input transition rise or fall rate VCC =

5 V ± 0.5 V

20 ns/V TA Operating free-air temperature C55

125 °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. SN74AHC245-EP OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS SCLS487A C MAY

2003 C REVISED JUNE

2003 4 POST OFFICE BOX

655303 ? DALLAS, TEXAS

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

2 V 1.9

2 1.9 IOH = C50 mA

3 V 2.9

3 2.9 VOH 4.5 V 4.4 4.5 4.4 V IOH = C4 mA

3 V 2.58 2.48 IOH = C8 mA 4.5 V 3.94 3.8

2 V 0.1 0.1 IOL =

50 mA

3 V 0.1 0.1 VOL 4.5 V 0.1 0.1 V IOL =

4 m........