当前位置：文档库 › 74LCX16245TTR中文资料

74LCX16245TTR中文资料

s5V TOLERANT INPUTS AND OUTPUTS

s HIGH SPEED:

t PD=4.5ns(MAX.)at V CC=3V

s POWER DOWN PROTECTION ON INPUTS AND OUTPUTS

s SYMMETRICAL OUTPUT IMPEDANCE: |I OH|=I OL=24mA(MIN)at V CC=3V

s PCI BUS LEVELS GUARANTEED AT24mA s BALANCED PROPAGATION DELAYS: t PLH?t PHL

s OPERATING VOLTAGE RANGE:

V CC(OPR)=2.0V to3.6V(1.5V Data

Retention)

s PIN AND FUNCTION COMPATIBLE WITH 74SERIES16245

s LATCH-UP PERFORMANCE EXCEEDS 500mA(JESD17)

s ESD PERFORMANCE:

HBM>2000V(MIL STD883method3015);

MM>200V

DESCRIPTION

The74LCX16245is a low voltage CMOS16BIT BUS TRANSCEIVER(3-STATE)fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS technology.It is ideal for low power and high speed 3.3V applications;it can be interfaced to5V signal environment for both inputs and outputs.

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

It has same speed performance at3.3V than5V AC/ACT family,combined with a lower power con-sumption.

All inputs and outputs are equipped with protec-tion circuits against static discharge,giving them 2KV ESD immunity and transient excess voltage. All floating bus terminals during High Z State must be held HIGH or LOW.74LCX16245

LOW VOLTAGE CMOS16-BIT BUS TRANSCEIVER WITH5V TOLERANT INPUTS AND OUTPUT(3-STATE)

ORDER CODES

PACKAGE TUBE T&R

TSSOP74LCX16245TTR

TSSOP

PIN CONNECTION

1/9 September2001

74LCX16245

2/9

INPUT AND OUTPUT EQUIVALENT CIRCUIT

PIN DESCRIPTION

TRUTH TABLE

X :Don‘t Care

Z :High Impedance

IEC LOGIC SYMBOLS

PIN No SYMBOL

NAME AND FUNCTION

1DIR Directional Control 2,3,5,6,8,9,

11,121B1to 1B8Data Inputs/Outputs 13,14,16,17,19,20,22,23

2B1to 2B8Data Inputs/Outputs 242DIR Directional Control 25

2G Output Enable Input 36,35,33,32,30,29,27,262A1to 2A8Data Inputs/Outputs 47,46,44,43,41,40,38,38

1A1to 1A8Data Inputs/Outputs

1G Output Enable Input 4,10,15,21,28,34,39,45GND Ground (0V)

7,18,31,42

V CC

Positive Supply Voltage

INPUTS FUNCTION OUTPUT G DIR A BUS

B BUS

Yn L L OUTPUT INPUT A =B L H INPUT OUTPUT B =A H

Z Z

74LCX16245

3/9

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

1)I O absolute maximum rating must be observed 2)V O

RECOMMENDED OPERATING CONDITIONS

1)Truth Table guaranteed:1.5V to 3.6V 2)V IN from 0.8V to 2V at V CC =3.0V

Symbol Parameter

Value Unit V CC Supply Voltage

-0.5to +7.0V V I DC Input Voltage (DIR,G)-0.5to +7.0V V I/O Bus I/O Voltage (OFF State)

-0.5to +7.0V V I/O Bus I/O Voltage (High or Low State)(note 1)-0.5to V CC +0.5

V I IK DC Input Diode Current

-50mA I OK DC Output Diode Current (note 2)-50mA I O DC Output Current

±50mA I CC DC Supply Current per Supply Pin ±100mA I GND DC Ground Current per Supply Pin ±100mA T stg Storage Temperature -65to +150

°C T L

Lead Temperature (10sec)

300

°C

Symbol Parameter

Value Unit V CC Supply Voltage (note 1) 2.0to 3.6V V I Input Voltage

0to 5.5V V O Output Voltage (OFF State)0to 5.5V V O Output Voltage (High or Low State)

0to V CC V I OH ,I OL High or Low Level Output Current (V CC =3.0to 3.6V)±24mA I OH ,I OL High or Low Level Output Current (V CC =2.7V)±12mA T op Operating Temperature

-55to 125°C dt/dv

Input Rise and Fall Time (note 2)

0to 10

ns/V

74LCX16245

4/9

DC SPECIFICATIONS

DYNAMIC SWITCHING CHARACTERISTICS

1)Number of outputs defined as ”n”.Measured with ”n-1”outputs switching from HIGH to LOW or LOW to HIGH.The remaining output is measured in the LOW state.

Symbol

Parameter

Test Condition

Value

Unit

V CC (V)

-40to 85°C -55to 125°C Min.Max.

Min.Max.

V IH High Level Input Voltage

2.7to

3.6

2.0

V V IL Low Level Input Voltage

0.8

V OH

High Level Output Voltage

2.7to

3.6I O =-100μA V CC -0.2V CC -0.2V

2.7I O =-12mA 2.2 2.2

3.0

I O =-18mA 2.4 2.4I O =-24mA 2.2

2.2

V OL

Low Level Output Voltage

2.7to

3.6I O =100μA 0.20.2V 2.7I O =12mA 0.40.43.0

I O =16mA 0.40.4I O =24mA 0.550.55I I Input Leakage Current

2.7to

3.6

V I =0to 5.5V ±5±5μA I off Power Off Leakage Current

0V I or V O =5.5V 1010μA I OZ High Impedance Output Leakage Current

2.7to

3.6V I =V IH or V IL V O =0to V CC ±5±5μA I CC Quiescent Supply Current

2.7to

3.6V I =V CC or GND 2020μA V I or V O =3.6to 5.5V ±20±20?I CC

I CC incr.per Input

2.7to

3.6

V IH =V CC -0.6V

500

μA Symbol

Parameter

Test Condition

Value Unit

V CC (V)T A =25°C Min.

Typ.Max.

V OLP Dynamic Low Level Quiet Output (note 1)

3.3

C L =50pF

V IL =0V,V IH =3.3V

0.8V V OLV

-0.8

74LCX16245

5/9

AC ELECTRICAL CHARACTERISTICS

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

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 operating current can be obtained by the following equation.I CC(opr)=C PD x V CC x f IN +I CC /16(per circuit)

Symbol

Parameter

Test Condition

Value

Unit

V CC (V)C L (pF)R L (?)t s =t r (ns)-40to 85°C -55to 125°C Min.Max.Min.Max.t PLH t PHL Propagation Delay Time

2.750500 2.5 1.5 5.2 1.5 5.2ns

3.0to 3.6 1.5

4.5 1.5 4.5t PZL t PZH Output Enable Time 2.750500 2.5 1.57.2 1.57.2ns 3.0to 3.6 1.5 6.5 1.5 6.5t PLZ t PHZ Output Disable Time 2.750500 2.5 1.5 6.9 1.5 6.9ns 3.0to 3.6 1.5

6.4 1.5

6.4t OSLH t OSHL

Output To Output Skew Time (note1,2)

3.0to 3.6

500

2.5

1.0

ns Symbol

Parameter

Test Condition

Value Unit

V CC (V)T A =25°C Min.

Typ.Max.

C IN Input Capacitance 3.3V IN =0to V CC 7pF C OUT Output Capacitance

3.3V IN =0to V CC 8pF C PD

Power Dissipation Capacitance (note 1)

3.3

f IN =10MHz V IN =0or V CC

74LCX16245

6/9

TEST CIRCUIT

C L =50pF or equivalent (includes jig and probe capacitance)R L =R1=500? or equivalent

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

WAVEFORM 1:PROPAGATION DELAYS (f=1MHz;50%duty cycle)

TEST

SWITCH t PLH ,t PHL Open t PZL ,t PLZ 6V t PZH ,t PHZ

GND

74LCX16245 WAVEFORM2:OUTPUT ENABLE AND DISABLE TIME(f=1MHz;50%duty cycle)

7/9

74LCX16245

8/9

DIM.

mm.inch

MIN.TYP MAX.MIN.TYP.MAX.

A 1.10.043 A10.050.150.0020.006 A20.90.035

b0.170.270.00670.011 c0.090.200.00350.0079 D12.412.60.4080.496 E7.958.250.3130.325 E1 6.0 6.20.2360.244 e0.5BSC0.0197BSC

K0°8°0°8°L0.500.750.0200.030

TSSOP48MECHANICAL DATA

c E

PIN1IDENTIFICATION

7065588A

74LCX16245 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 infringe ment 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.

?The ST logo is a registered trademark of STMicroelectronics

STMicroelectronics GROUP OF COMPANIES

Australia-Brazil-China-Finland-France-Germany-Hong Kong-India-Italy-Japan-Malaysia-Malta-Morocco

Singapore-Spain-Sweden-Switzerland-United Kingdom

?http://w https://www.wendangku.net/doc/ac7777562.html,

9/9