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74LVX4245TTR中文资料

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August 2004

HIGH SPEED:

t PD = 8.5 ns (MAX.) at V CCA =5.0V V CCB = 3.3V

LOW POWER DISSIPATION:

I CCA = I CCB =5μA(MAX.) at T A =25°C s

LOW NOISE: V OLP =0.3V (TYP.) at V CCA =5.5V V CCB =3.3V

SYMMETRICAL OUTPUT IMPEDANCE:|I OH | = I OL = 24mA (MIN)

BALANCED PROPAGATION DELAYS:t PLH ? t PHL

OPERATING VOLTAGE RANGE:

V CCA (OPR) = 4.5V to 5.5V (1.2V D ata Retention)V CCB (OPR) = 2.7V to 3.6V (1.2V D ata Retention)PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 4245

IMPROVED LATCH-UP IMMUNITY

DESCRIPTION

The 74LVX4245 is a dual supply low voltage CMOS OCTAL BUS TRANSCEIVER fabricated with sub-micron silicon gate and double-layer metal wiring C 2MOS technology. Designed for use as an interface between a 5V bus and a 3.3V bus in a mixed 5V/3.3V supply systems, it achieves high speed operation while maintaining the CMOS low power dissipation.

This IC is intended for two-way asynchronous communication between data buses and the direction of data transmission is determined by DIR input. The enable input G can be used to disable the device so that the buses are effectively isolated.

The A-port interfaces with the 5V bus, the B-port with the 3.3V bus.

All inputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage.

74LVX4245

OCTAL DUAL SUPPLY BUS TRANSCEIVER

Table 1: Order Codes

PACKAGE T & R SOP 74LVX4245MTR TSSOP

74LVX4245TTR

74LVX4245

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Figure 2: Input And Output Equivalent Circuit

Table 2: Pin Description

Table 3: Truth Table

X : Don’t Care

Z : High Impedance

Table 4: Absolute Maximum Ratings

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is

not implied

PIN N°SYMBOL NAME QND FUNCTION 2

DIR Directional Control 3, 4, 5, 6, 7, 8, 9, 10A1 to A8Data Inputs/Outputs 21, 20, 19, 18, 17, 16, 15, 14B1 to B8

Data Inputs/Outputs

22G Output Enable Input 11, 12, 13

GND Ground (0V)23NC Not Connected

V CCA Positive Supply Voltage 24

V CCB

Positive Supply Voltage

INPUTS

FUNCTION

OUTPUT G DIR A BUS B BUS L L OUTPUT INPUT A = B L H INPUT OUTPUT

B = A H

Symbol Parameter

Value Unit V CCA Supply Voltage -0.5 to +7.0V V CCB Supply Voltage -0.5 to +7.0V V I DC Input Voltage -0.5 to V CCA + 0.5V V I/OA DC I/O Voltage -0.5 to V CCA + 0.5V V I/OB DC I/O Voltage -0.5 to V CCB + 0.5

V I IK DC Input Diode Current ± 20mA I OK DC Output Diode Current ± 50mA I OA DC Output Current ± 50mA I OB DC Output Current ± 50mA I CCA DC V CC or Ground Current ± 200mA I CCB DC V CC or Ground Current ± 100mA P d Power Dissipation 180mW T stg Storage Temperature -65 to +150

°C T L

Lead Temperature (10 sec)

300

°C

74LVX4245

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Table 5: Recommended Operating Conditions

1) V IN from 30% to 70% of V CC

2) V CCA = 4.5 to 5.5V; V CCB = 2.7 to 3.6V;

Table 6: DC Specifications For V CCA

Symbol Parameter

Value Unit V CCA Supply Voltage (note 1) 4.5 to 5.5V V CCB Supply Voltage (note 1) 2.7 to 3.6V V I Input Voltage 0 to V CCA V V I/OA I/O Voltage 0 to V CCA V V I/OB I/O Voltage

0 to V CCB V T op Operating Temperature

-55 to 125°C dt/dv

Input Rise and Fall Time (note 2)

0 to 10

ns/V

Symbol

Parameter

Test Condition

Value

Unit V CCA (V)V CCB (V)T A = 25 °C -40 to 85 °C -55 to 125°C Min.Typ.

Max.

Min.Max.

V IHA High Level Input Voltage

4.5 3.3 2.0 2.0 2.0V

5.5 3.3 2.0

2.0

V ILA Low Level Input Voltage 4.5 3.30.80.80.8V 5.5 3.30.8

0.8

0.8V OHA High Level Output Voltage 4.5 3.0I O =-100 μA 4.4 4.5

4.4 4.4V 4.5 3.0I O =-24 mA 3.86

3.76

V OLA Low Level Output Voltage

4.5 3.0I O =100 μA 0

0.10.10.1V 4.5 3.0I O =24 mA 0.360.440.44I IA Input Leakage Current

5.5 3.6V I = V CC or GND ± 0.1± 1± 1μA I OZA

High Impedance Output Leakage Current

5.5

3.6

V IA = V IHA or V ILA V IB = V IHB or V ILB V I/OA = V CCA or

GND

± 0.5± 5

± 5

μA

I CCtA

Quiescent Supply Current

5.5 3.6V IA = V CCA or

GND

V IB = V CCB or

GND

55050μA

?I CCtA

Maximum

Quiescent Supply Current / Input (An, DIR, G)

5.5 3.6V IA = V CCA - 2.1V V IB = V CCB or

GND

1.35 1.5 1.5mA

74LVX4245

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Table 7: DC Specifications For V CCB

Table 8: Dynamic Switching Characteristics

1) Worst case package

2) Max number of output defined as (n). Data inputs are driven 0V to 3.3V, (n-1) outputs switching and one output at GND

3) Max number of data inputs (n) switching. (n-1) switching 0V to 3.3V. Inputs under test switching: 3V to threshold (V ILD ). 0V to threshold (V IHD ) f = 1MHz

Symbol

Parameter

Test Condition

Value

Unit V CCA (V)V CCB (V)T A = 25 °C -40 to 85 °C -55 to 125°C Min.Typ.

Max.

Min.Max.

V IHB High Level Input Voltage

5.0 3.6 2.0 2.0 2.0V 5.0 2.7 2.0

2.0

V ILB Low Level Input Voltage 5.0 3.60.80.80.8V

5.0 2.70.8

0.8

0.8V OHB

High Level Output Voltage

4.5 3.0I O =-100 μA 2.9 3.0

2.9 2.9V

4.5 3.0I O =-12 mA 2.48 2.4 2.44.5

2.7I O =-8 mA 2.26

2.2

V OLB

Low Level Output Voltage

4.5 3.0I O =100 μA 0.0

0.10.10.1V 4.5 3.0I O =12 mA 0.310.400.404.5

2.7I O =8 mA 0.310.400.40I IB Input Leakage Current

5.5 3.6V I = V CCA or GND ± 0.1± 1± 1μA I OZB

High Impedance Output Leakage Current

5.5

3.6

V IA = V IHA or V ILA V I/Ob = V CCb or

GND

± 0.5± 5

± 5

μA I CCtB

Quiescent Supply Current

5.5 3.6V IA = V CCA or

GND

V IB = V CCB or

GND

5505μA

?I CCtB

Maximum

Quiescent Supply Current / Input

5.5 3.6V IA = V CCA or

GND

V IB = V CCB - 0.6V

0.350.50.35mA

Symbol

Parameter

Test Condition

Value

Unit V CCA (V)V CCB (V)T A = 25 °C -40 to 85 °C -55 to 125°C Min.

Typ.Max.Min.

Max.

Min.

Max.

V OLPA Dynamic Low Level

Quiet Output (note 1, 2)

5.0 3.3 1.0 1.5

5.0 3.3-1.2

-0.6V OLPB Dynamic Low Level Quiet Output (note 1, 2)

5.0 3.30.8 1.2

V 5.0 3.3-0.8-0.5

V IHDA Dynamic High Voltage Input (note 1, 3)

5.0 3.32V V ILDA Dynamic Low Voltage Input (note 1, 3)

5.0 3.30.8

V V IHDB Dynamic High Voltage Input (note 1, 3)

5.0 3.32

V V ILDB

Dynamic Low Voltage Input (note 1, 3)

5.0

3.3

0.8V

74LVX4245

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Table 9: AC Electrical Characteristics (C L = 50pF, Input t r = t f = 3ns)

1) Skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs of the same device switch-ing in the same direction, either HIGH or LOW (t OSLH = | t PLHm - t PLHn |, t OSHL = | t PHLm - t PHLn |2) Parameter guaranteed by design

3) Typical values at V CCA = 5.0V, V CCB = 3.3V (*) Voltage range is 3.0V ± 0.3V

Symbol

Parameter

Test Condition

Value (3)Unit

V CCB (V)T A = 25°C -40 to 85°C -55 to 125°C Min.

Typ.

Max.

Min.Max.Min.Max.t PLH Propagation Delay Time (An to Bn) 2.7 1.010.0 1.011.0ns 3.0(*) 1.0 5.18.5 1.09.0 1.010.0t PHL Propagation Delay Time (An to Bn) 2.7 1.010.0 1.011.03.0(*) 1.0 5.38.5 1.09.0 1.010.0t PZL Output Enable Time (G to Bn) 2.7 1.011.5 1.012.5ns 3.0(*) 1.0 6.510.0 1.010.5 1.011.5t PZH Output Enable Time (G to Bn) 2.7 1.011.5 1.011.53.0(*) 1.0 6.710.0 1.010.5 1.011.5t PLZ Output Disable Time (G to Bn) 2.7 1.010.0 1.011.0ns 3.0(*) 1.0 6.09.5 1.010.0 1.011.0t PHZ Output Disable Time (G to Bn) 2.7 1.07.5 1.08.53.0(*) 1.0 3.3 6.5 1.07.0 1.08.0t PLH Propagation Delay Time (Bn to An) 2.7 1.010.0 1.011.0ns 3.0(*) 1.0 5.48.5 1.09.0 1.010.0t PHL Propagation Delay Time (Bn to An) 2.7 1.010.0 1.011.03.0(*) 1.0 5.58.5 1.09.0 1.010.0t PZL Output Enable Time (G to An) 2.7 1.010.0 1.011.0ns 3.0(*) 1.0 5.29.0 1.09.5 1.010.5t PZH Output Enable Time (G to An) 2.7 1.010.0 1.011.03.0(*) 1.0 5.89.0 1.09.5 1.010.5t PLZ Output Disable Time (G to An) 2.7 1.07.5 1.08.5ns 3.0(*) 1.0 3.97.0 1.07.5 1.08.5t PHZ Output Disable Time (G to An)

2.7 1.07.5 1.08.5

3.0(*) 1.0

2.9 6.5 1.0

7.0 1.0

8.0t OSLH t OSHL

Output To Output Skew Time (note1,

2.7

0.5 1.0 1.5 1.5ns 3.3(**)

0.5

1.0

1.5

74LVX4245

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Table 10: Capacitive Characteristics

1) C PD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without load. (Refer to Test Circuit). Average current can be obtained by the following equation. I CC(opr) = C PD x V CC x f IN + I CC /8 (per circuit)

Figure 3: Test Circuit

C L = 50pF or equivalent (includes jig and probe capacitance)R L = R 1 = 500? or equivalent

R T = Z OUT of pulse generator (typically 50?)

Symbol

Parameter

Test Condition

Value

Unit V CCA (V)V CCB (V)T A = 25 °C -40 to 85 °C -55 to 125°C Min.

Typ.Max.Min.

Max.Min.

Max.C INA Input

Capacitance open open 4.510

V C I/O Input/Output Capacitance 3.3 5.010V C PD

Dynamic Low Level Quiet Output (note 1) A to B

3.3

5.0

C PD

Dynamic Low Level Quiet Output (note 1) B to A

3.3 5.040V

TEST

SWITCH t PLH , t PHL Open t PZLH , t PLZ 2V CC t PZH , t PHZ

Open

74LVX4245 Figure 4: Waveform - Propagation Delays (f=1MHz; 50% duty cycle)

Figure 5: Waveform - Output Enable And Disable Time (f=1MHz; 50% duty cycle)

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74LVX4245

8/13DIM.

mm.inch

MIN.TYP MAX.MIN.TYP.MAX.

A 2.35 2.650.0930.104 A10.10.300.0040.012 B0.330.510.0130.020 C0.230.320.0090.013 D15.2015.600.5980.614 E7.47.60.2910.299 e 1.270.050

H10.0010.650.3940.419 h0.250.750.0100.030 L0.4 1.270.0160.050 k0°8°0°8°ddd0.1000.004

SO-24 MECHANICAL DATA

0070769C

74LVX4245

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DIM.

mm.

inch

MIN.

TYP

MAX.MIN.

TYP.

MAX.A 1.10.043A10.05

0.15

0.002

0.006

A20.9

0.035

b 0.190.300.00750.0118

c 0.090.200.00350.0079D 7.77.90.3030.311E 4.3

4.5

0.169

0.177

e 0.65 BSC

0.0256 BSC

H 6.25 6.50.2460.256K 0°8°0°8°L

0.500.70

0.020

0.028

TSSOP24 MECHANICAL DATA

7047476B

PIN 1 IDENTIFICATION

74LVX4245

Tape & Reel SO-24 MECHANICAL DATA

mm.inch DIM.

MIN.TYP MAX.MIN.TYP.MAX.

A33012.992 C12.813.20.5040.519 D20.20.795

N60 2.362

T30.4 1.197 Ao10.811.00.4250.433 Bo15.715.90.6180.626 Ko 2.9 3.10.1140.122 Po 3.9 4.10.1530.161 P11.912.10.4680.476

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74LVX4245 Tape & Reel TSSOP24 MECHANICAL DATA

mm.inch

DIM.

MIN.TYP MAX.MIN.TYP.MAX.

A33012.992

C12.813.20.5040.519

D20.20.795

N60 2.362

T22.40.882

Ao 6.870.2680.276

Bo8.28.40.3230.331

Ko 1.7 1.90.0670.075

Po 3.9 4.10.1530.161

P11.912.10.4680.476

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74LVX4245

Table 11: Revision History

Date Revision Description of Changes 27-Aug-20046Ordering Codes Revision - pag. 1.

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74LVX4245 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted

by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not

authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.

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