2022年LVC-电平转换[参 .pdf

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1、Rev.1.01 Apr. 13, 2005 page 1 of 8 HD74LVC4245A Octal Bus Transceiver and 3.3 V to 5 V shifters with 3-state Outputs REJ03D0378 0101 Rev.1.01 Apr. 13, 2005 Description The HD74LVC4245A has eight bus transceivers with three state outputs in a 24 pin package. When (DIR) is high, data flows from the A

2、inputs to the B outputs, and when (DIR) is low, data flows from the B inputs to the A outputs. A and B bus are separated by making enable input (OE) high level. And this product has two terminals (VCCA, VCCB), VCCA(5V) is connected with control input and A bus side, VCCB (3.3V) connected with B bus

3、side. VCCA and VCCB are isolated. This allows for translation from a 3.3 V to a 5 V environment, and vice versa. Low voltage and high-speed operation is suitable at the battery drive product (note type personal computer) and low power consumption extends the life of a battery for long time operation

4、. Features ? This product function as level shift transceiver that change VCCA input level to VCCB output level, VCCB input level to VCCA output level by providing different supply voltage to VCCA and VCCB. ? This product is able to the power management: Turn on and off the supply on VCCB side with

5、providing the supply of VCCA. (Enable input (OE): High level ) ? VCCA = 4.5 V to 5.5 V, VCCB = 2.7 V to 3.6 V ? All control input VI (max) = 5.5 V (VCCA = 0 V to 5.5 V) ? All A bus side input outputs VI/O (max) = 5.5 V (VCCA = 0 V or output off state) ? All B bus side input outputs VI/O (max) = 3.6

6、V (VCCB = 0 V or output off state) ? High output current A bus side : 24 mA (VCCA = 4.5 V to 5.5 V) B bus side : 12 mA (VCCB = 2.7 V) 24 mA (VCCB = 3.0 V to 3.6 V) ? Ordering Information Part Name Package Type Package Code (Previous Code) Package Abbreviation Taping Abbreviation (Quantity) HD74LVC42

7、45ATEL TSSOP24 pin PTSP0024JB A (TTP24DBV) T EL (1,000 pcs/reel) Function Table Inputs OE DIR OperationL L B data to A bus L H A data to B bus H X Z H: High level L: Low level X: Immaterial Z: High impedance 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 1 页，共 9 页 -

8、- - - - - - - - HD74LVC4245A Rev.1.01 Apr. 13, 2005 page 2 of 8 Pin Arrangement 12345678910VCCAVCCBVCCBDIRA1A8A7A6A5A4A3A2GNDGND1112131415161718192021222324GNDB7B6B4B5B3B2OEB8B1(Top view)Absolute Maximum Ratings (1) For VCCAItem Symbol Ratings Unit Conditions Supply voltage VCCA0.5 to 6.0 V Input vo

9、ltage*1VI0.5 to 6.0 V DIR, OE0.5 to VCCA+0.5 A port output “H” or “L” Input / output voltage VI/O0.5 to 6.0 V A port output “Z” or VCCA : OFF Input diode current IIK 50 mA VI 0 50 VO VCCA+0.5 Output current IO 50 mA VCCA, GND current ICCA or IGND 100 mA Maximum power dissipation at Ta = 25C (in stil

10、l air)*2PT 862 mW TSSOP Storage temperature Tstg 65 to 150 C (2) For VCCBItem Symbol Ratings Unit Conditions Supply voltage VCCB0.5 to 4.6 V 0.5 to VCCB+0.5 B port output “H” or “L” Input / output voltage*1VI/O0.5 to 4.6 V B port output “Z” or VCCB : OFF Input diode current IIK 50 mA VI 0 50 VO VCCB

11、+0.5 Output current IO 50 mA VCCB,GND current ICCB or IGND 100 mA Maximum power dissipation at Ta = 25C (in still air)*2PT 862 mW TSSOP Storage temperature Tstg 65 to 150 C Notes: The absolute maximum ratings are values, which must not individually be exceeded, and furthermore, no two of which may b

12、e realized at the same time. 1. The input and output voltage ratings may be exceeded even if the input and output clamp-current ratings are observed. 2. The maximum package power dissipation was calculated using a junction temperature of 150C. 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - -

13、 名师精心整理 - - - - - - - 第 2 页，共 9 页 - - - - - - - - - HD74LVC4245A Rev.1.01 Apr. 13, 2005 page 3 of 8 Recommended Operating Conditions (1) For VCCAItem Symbol Ratings Unit Conditions Supply voltage VCCA4.5 to 5.5 V VI0 to 5.5 DIR, OE0 to VCCAA port output “H” or “L” Input / output voltage VI/O0 to 5.5

14、 V A port output “Z” or VCCA : OFF IOH 24 Output current IOL 24 mA Input transition rise or fall time ?t / ?v 10 ns / V Operating temperature Ta 40 to 85 C (2) For VCCBItem Symbol Ratings Unit Conditions Supply voltage VCCB2.7 to 3.6 V 0 to VCCBB port output “H” or “L” Input / output voltage VI/O0 t

15、o 3.6 V B port output “Z” or VCCB : OFF 12 VCCB = 2.7 V IOH24 VCCB = 3.0 to 3.6 V 12 VCCB = 2.7 V Output current IOL24 mA VCCB = 3.0 to 3.6 V Input transition rise or fall time ?t / ?v 10 ns / V Operating temperature Ta 40 to 85 C Note: Unused or floating inputs must be held high or low. Block Diagr

16、am OEB1DIRA1222123To seven other channels名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 3 页，共 9 页 - - - - - - - - - HD74LVC4245A Rev.1.01 Apr. 13, 2005 page 4 of 8 Electrical Characteristics (Ta = 40 to 85C) Item Symbol VCCA (V) VCCB (V) Min Max Unit Test Conditions

17、VIH4.5 to 5.5 2.7 to 3.6 2 Input voltage VIL4.5 to 5.5 2.7 to 3.6 0.8 V 4.5 to 5.5 2.7 to 3.6 VCCA0.2IOH = 100 A 4.5 2.7 to 3.6 3.7 VOHA5.5 2.7 to 3.6 4.7 V IOH = 24 mA 4.5 to 5.5 2.7 to 3.6 VCCB0.2IOH = 100 A 4.5 to 5.5 2.7 2.2 4.5 to 5.5 3.0 2.4 IOH = 12 mA VOHB4.5 to 5.5 3.0 2 V IOH = 24 mA 4.5 t

18、o 5.5 2.7 to 3.6 0.2 IOL = 100 A 4.5 2.7 to 3.6 0.55 VOLA5.5 2.7 to 3.6 0.55 V IOL = 24 mA 4.5 to 5.5 2.7 to 3.6 0.2 IOL = 100 A 4.5 to 5.5 2.7 0.4 IOL = 12 mA Output voltage VOLB4.5 to 5.5 3.0 0.55 V IOL = 24 mA Input current IIN5.5 2.7 to 3.6 1 A Control input IOZA5.5 2.7 to 3.6 5 A port, VO = VCC

19、A or GND Off state output current IOZB4.5 to 5.5 3.6 5 A B port, VO = VCCB or GND Output leak current IOFF 0 0 20 A A port, VI/O = 5.5 V B port, VI/O = 3.6 V ICCA5.5 2.7 to 3.6 80 A B to A, control input =VCCA or GNDBn = VCCB or GND, IO (A port) = 0 Quiescent supply current ICCB4.5 to 5.5 3.6 50 A A

20、 to B, control input =VCCA or GNDAn = VCCA or GND, IO (B port) = 0 ?ICCA5.5 2.7 to 3.6 1.5 mA A port or Control input, One input at 3.4 V, Other input at VCCA at GNDIncrease in ICCper input *1?ICCB4.5 to 5.5 2.7 to 3.6 0.5 mA B port, One input at VCCB0.6V, Other input at VCCB at GNDNotes: For condit

21、ion shown as Min or Max, use the appropriate values under recommended operating conditions. 1. This is the increase in supply current for each input that is at the specified TTL voltage level rather than VCCor GND. 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 4 页，共

22、 9 页 - - - - - - - - - HD74LVC4245A Rev.1.01 Apr. 13, 2005 page 5 of 8 Capacitance (Ta = 25 C) Item Symbol VCCA (V)VCCB (V)Min Typ Max Unit Test Conditions Control Input capacitance CIN 5 3.3 5 pF VI = VCCA or GND Input/output capacitance CI/O 5 3.3 11 pF A port, VI = VCCA or GND, B port, VI = VCCB

23、or GND Switching Characteristics (Ta = 40 to 85C), VCCA = 5.00.5 V, VCCB = 2.7 V to 3.6 V) Item Symbol Min Typ Max Unit Test conditions From(Input) To(Output)tPLH 1 6.7 tPHL 1 6.3 A B tPLH 1 5 Propagation delay time tPHL 1 6.1 ns CL = 50 pF RL = 500 ?B A tZH 1 8.1 tZL 1 9 OE A tZH 1 9.8 Output enabl

24、e time tZL 1 8.8 ns CL = 50 pF RL = 500 ?OE B tHZ 1 5.8 tLZ 1 7 OE A tHZ 1 7.8 Output disable time tLZ 1 7.7 ns CL = 50 pF RL = 500 ?OE B Operating Characteristics Item Symbol VCCA (V)VCCB (V)Min Typ Max Unit Test Conditions Power dissipation capacitance CPD 5.0 3.0 39.5 pF f = 10 MHz, CL = 0 Power-

25、up considerations Level-translation devices offer an opportunity for successful mixed-voltage signal design. A proper power-up sequence always should be followed to avoid excessive supply current, bus contention, oscillations, or other anomalies caused by improperly biased device pins. Take these pr

26、ecautions to guard against such power-up problems. 1. Connect ground before any supply voltage is applied. 2. Next, power up the control side of the device. (Power up of VCCA is first. Next power up is VCCB.) 3. Tie OE to VCCA with a pullup resistor so that it ramps with VCCA. 4. Depending on the di

27、rection of the data path, DIR can be high or low. If DIR high is needed (A data to B bus), ramp it with VCCA. Overwise, keep DIR low. 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 5 页，共 9 页 - - - - - - - - - HD74LVC4245A Rev.1.01 Apr. 13, 2005 page 6 of 8 Test Circu

28、it OPENS1CL = 50 pF *1500 ?Load circuit for outputs500 ?See under tableGNDSymbolt / tPLHPHLt / tZHHZt / tZLLZS1OPENOPENGNDGND6 VNote: 1. CL includes probe and jig capacitance.VCCA = 5 0.5 VVCCB = 2.7 to 3.6 VA/OE to BB/OE to A2 VCCAWaveforms 1 Input10 %Vref1Vref2Vref2Vref2Vref1Vref190 %tr90 %VIHVIHG

29、ND10 %tfOutputtPLHVtPHLOHVOLSymbol3.0 V2.7 V1.5 V1.5 V1.5 VVCCA = 5 0.5 VVCCB = 2.7 to 3.6 VA to BB to A1/2 VCCA名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 6 页，共 9 页 - - - - - - - - - HD74LVC4245A Rev.1.01 Apr. 13, 2005 page 7 of 8 Waveforms 2 Waveform - BNotes: 1

30、. All input pulses are supplied by generators having the following characteristics : PRR 10 MHz, ZO = 50 ? , tr 2.5 ns, tf 2.5 ns. 2. Waveform - A is for an output with internal conditions such that the output is low except when disabled by the output control. 3. Waveform - B is for an output with i

31、nternal conditions such that the output is high except when disabled by the output control. 4. The output are measured one at a time with one transition per measurement.Waveform - AVOHVOLV + 0.3 VOLV - 0.3 VOHOutputControl10 %10 %Vref1Vref190 %tf90 %VIHVOHGNDGNDtrVref2Vref2tHZtLZtZHtZLVref2Vref1VIHS

32、ymbol3.0 V3.0 V1.5 V1.5 V1.5 VVCCA = 5 0.5 VVCCB = 2.7 to 3.6 VOE to BOE to A1/2 VCCA名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 7 页，共 9 页 - - - - - - - - - HD74LVC4245A Rev.1.01 Apr. 13, 2005 page 8 of 8 Package Dimensions Index markF*1*2*3pMxy1E122413ADEHZb Term

33、inal cross section ( Ni/Pd/Au plating )pbc11Detail FALL0.650.100.656.206.600.200.15pA18.10TTP-24DBVRENESAS CodeJEITA Package CodePrevious CodeMaxNomMinDimension in MillimetersSymbolReference1.100.60.50.44.400.100.070.030.250.200.150.106.40800.131.07.800.08gMASSTyp.1E112LZHyxcbAEDbceeLAP-TSSOP24-4.4x

34、7.8-0.65PTSP0024JB-ANOTE)1. DIMENSIONS*1 (Nom)AND*2DO NOT INCLUDE MOLD FLASH.2. DIMENSION*3DOES NOTINCLUDE TRIM OFFSET.名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 8 页，共 9 页 - - - - - - - - - Keep safety first in your circuit designs!1. Renesas Technology Corp. put

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