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74VHC125T [STMICROELECTRONICS]

QUAD BUS BUFFERS 3-STATE; 四路总线缓冲器三态
74VHC125T
型号： 74VHC125T
厂家： ST    ST
描述：

QUAD BUS BUFFERS 3-STATE
四路总线缓冲器三态

总线驱动器 总线收发器 逻辑集成电路 光电二极管
文件： 总8页 (文件大小：64K)
中文：  中文翻译
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74VHC125  
QUAD BUS BUFFERS (3-STATE)  
PRELIMINARY DATA  
■
■
HIGH SPEED:tPD =3.8ns (TYP.) atVCC = 5V  
LOW POWER DISSIPATION:  
CC =4 µA (MAX.) at TA =25 oC  
I
■
HIGH NOISEIMMUNITY:  
M
T
VNIH = VNIL =28% VCC (MIN.)  
POWERDOWN PROTECTIONON INPUTS  
SYMMETRICAL OUTPUT IMPEDANCE:  
|IOH| = IOL = 8 mA (MIN)  
BALANCEDPROPAGATIONDELAYS:  
tPLH tPHL  
(Micro Package)  
(TSSOPPackage)  
■
■
ORDER CODES :  
74VHC125M  
74VHC125T  
■
■
■
This device requires the 3-STATE control input G  
to be set high to place the output into the high  
impedance state.  
Power down protection is provided on all inputs  
and 0 to 7V can be accepted on inputs with no  
regard to the supply voltage. This device can be  
used to interface5V to 3V.  
OPERATING VOLTAGERANGE:  
VCC (OPR)= 2V to 5.5V  
PIN AND FUNCTION COMPATIBLEWITH  
74 SERIES125  
IMPROVED LATCH-UP IMMUNITY  
LOWNOISE:VOLP = 0.8V(Max.)  
■
■
All inputs and outputs are equipped with  
protection circuits against static discharge, giving  
them 2kV ESD immunity and transient excess  
voltage.  
DESCRIPTION  
The 74VHC125 is an advanced high-speed  
CMOS QUAD BUS BUFFERS fabricated with  
sub-micron silicon gate and double-layer metal  
wiring C2MOS technology.  
PIN CONNECTION AND IEC LOGIC SYMBOLS  
1/8  
June 1999  
74VHC125  
INPUT EQUIVALENT CIRCUIT  
PIN DESCRIPTION  
PIN No  
1, 4, 10, 13  
2, 5, 9, 12  
3, 6, 8, 11  
7
SYMBOL NAME AND FUNCTION  
1G to 4G Output Enable Inputs  
1A to 4A Data Inputs  
1Y to 4Y Data Outputs  
GND  
VCC  
Ground (0V)  
14  
Positive Supply Voltage  
TRUTH TABLE  
A
X
L
G
Y
Z
L
H
L
L
H
H
X:”H” or”L”  
Z: High Impedance  
ABSOLUTE MAXIMUM RATINGS  
Symbol  
VCC  
VI  
Parameter  
Value  
Unit  
V
Supply Voltage  
-0.5 to +7.0  
-0.5 to +7.0  
-0.5 to VCC + 0.5  
- 20  
DC Input Voltage  
V
VO  
DC Output Voltage  
DC Input Diode Current  
DC Output Diode Current  
DC Output Current  
V
IIK  
mA  
mA  
mA  
mA  
oC  
IOK  
± 20  
IO  
± 25  
ICC or IGND DC VCC or Ground Current  
± 50  
Tstg  
TL  
Storage Temperature  
-65 to +150  
Lead Temperature (10 sec)  
300  
oC  
AbsoluteMaximum Ratingsarethose values beyond whichdamage tothe device may occur. Functional operation under these condition isnot implied.  
RECOMMENDED OPERATING CONDITIONS  
Symbol  
VCC  
VI  
Parameter  
Value  
2.0 to 5.5  
0 to 5.5  
Unit  
V
Supply Voltage  
Input Voltage  
V
VO  
Output Voltage  
0 to VCC  
-40 to +85  
V
oC  
Top  
Operating Temperature  
dt/dv  
0 to 100  
0 to 20  
ns/V  
ns/V  
Input Rise and Fall Time (see note 1) (VCC = 3.3 0.3V)  
±
(V CC = 5.0 ± 0.5V)  
1)VIN from30% to70%of VCC  
2/8  
74VHC125  
DC SPECIFICATIONS  
Symbol  
Parameter  
Test Conditions  
VCC  
(V)  
Value  
TA = 25 oC  
Min. Typ. Max. Min. Max.  
Unit  
-40 to 85 oC  
VIH  
VIL  
High Level Input  
Voltage  
2.0  
3.0 to 5.5  
2.0  
1.5  
1.5  
V
V
0.7VCC  
0.7VCC  
Low Level Input  
Voltage  
0.5  
0.5  
3.0 to 5.5  
2.0  
0.3VCC  
0.3VCC  
VOH  
High Level Output  
Voltage  
IO=-50 µA  
1.9  
2.9  
2.0  
3.0  
4.5  
1.9  
2.9  
3.0  
I =-50  
A
A
µ
µ
O
V
V
4.5  
I =-50  
O
4.4  
4.4  
3.0  
IO=-4 mA  
IO=-8 mA  
IO=50 µA  
2.58  
3.94  
2.48  
3.8  
4.5  
VOL  
Low Level Output  
Voltage  
2.0  
0.0  
0.0  
0.0  
0.1  
0.1  
0.1  
0.1  
3.0  
I =50  
A
A
µ
µ
O
4.5  
I =50  
O
0.1  
0.1  
3.0  
IO=4 mA  
IO=8 mA  
0.36  
0.36  
±0.25  
0.44  
0.44  
±2.5  
4.5  
IOZ  
High Impedance  
Output Leakage  
Current  
VI = VIH or VIL  
µA  
µA  
VO = VCC or GND  
5.5  
II  
Input Leakage Current  
0 to 5.5  
5.5  
VI = 5.5V or GND  
VI = VCC or GND  
±0.1  
±1.0  
ICC  
Quiescent Supply  
Current  
4
40  
A
µ
AC ELECTRICAL CHARACTERISTICS (Input tr = tf =3 ns)  
Symbol  
Parameter  
Test Condition  
Value  
TA = 25 oC  
Unit  
VCC  
CL  
-40 to 85 oC  
(V)  
(pF)  
Min. Typ. Max. Min. Max.  
tPLH  
tPHL  
Propagation Delay  
Time  
3.3(*)  
3.3(*)  
15  
50  
5.6  
8.1  
3.8  
5.3  
5.4  
7.9  
3.6  
5.1  
9.5  
6.1  
8.0  
11.5  
5.5  
1.0  
1.0  
1.0  
1.0  
1.0  
1.0  
1.0  
1.0  
1.0  
1.0  
9.5  
13.0  
6.5  
ns  
5.0(**)  
5.0(**)  
3.3(*)  
3.3(*)  
5.0(**)  
5.0(**)  
3.3(*)  
5.0(**)  
15  
50  
15  
50  
15  
50  
50  
50  
7.5  
8.5  
tPLZ  
tPHZ  
Output Disable Time  
RL = 1KΩ  
RL = 1KΩ  
RL = 1KΩ  
8.0  
9.5  
11.5  
5.1  
13.0  
6.0  
ns  
ns  
R = 1K  
7.1  
8.0  
Ω
L
tPZL  
tPZH  
Output Enable Time  
RL = 1KΩ  
13.2  
8.8  
15.0  
10.0  
R = 1K  
Ω
L
(*) Voltagerangeis3.3V ± 0.3V  
(**) Voltagerange is 5V± 0.5V  
3/8  
74VHC125  
CAPACITIVE CHARACTERISTICS  
Symbol  
Parameter  
Test Conditions  
Value  
TA = 25 oC  
Min. Typ. Max. Min. Max.  
Unit  
-40 to 85 oC  
CIN  
Input Capacitance  
4
6
10  
10  
pF  
pF  
pF  
COUT Output Capacitance  
CPD  
Power Dissipation  
14  
Capacitance (note 1)  
1)CPD isdefined as thevalue ofthe IC’sinternal equivalent capacitance whichiscalculated fromthe operating current consumption without load. (Referto  
TestCircuit).Average operting current can beobtained bythe followingequation. ICC(opr)= CPD • VCC • fIN + ICC/4(per circuit)  
DYNAMIC SWITCHING CHARACTERISTICS  
Symbol  
Parameter  
Test Conditions  
VCC  
(V)  
Value  
TA = 25 oC  
Min. Typ. Max. Min. Max.  
Unit  
-40 to 85 oC  
VOLP Dynamic Low Voltage  
5.0  
0.3  
0.8  
Quiet Output (note 1, 2)  
VOLV  
-0.8  
3.5  
-0.3  
VIHD  
VILD  
Dynamic High Voltage  
Input (note 1, 3)  
5.0  
5.0  
CL = 50 pF  
V
Dynamic Low Voltage  
Input (note 1, 3)  
1.5  
1)Worstcase package.  
2)Max number ofoutputs defined as (n). Datainputs aredriven 0Vto5.0V, (n -1)outputs switching andone outputatGND.  
3)Max number ofdatainputs (n)switching.(n-1)switching 0Vto5.0V. Inputsunder testswitching: 5.0Vtothreshold (VILD),0V tothreshold (VIHD),f=1MHz.  
TEST CIRCUIT  
TEST  
SWITCH  
Open  
VCC  
tPLH, tPHL  
tPZL, tPLZ  
tPZH, tPHZ  
GND  
CL = 15/50 pF or equivalent (includes jig and probe capacitance)  
RL =R1 =1KΩ orequivalent  
RT = ZOUT ofpulse generator (typically50Ω)  
4/8  
74VHC125  
WAVEFORM 1: PROPAGATION DELAYS  
(f=1MHz; 50% duty cycle)  
WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle)  
5/8  
74VHC125  
SO-14 MECHANICAL DATA  
mm  
inch  
TYP.  
DIM.  
MIN.  
TYP.  
MAX.  
1.75  
0.2  
MIN.  
MAX.  
0.068  
0.007  
0.064  
0.018  
0.010  
A
a1  
a2  
b
0.1  
0.003  
1.65  
0.46  
0.25  
0.35  
0.19  
0.013  
0.007  
b1  
C
0.5  
0.019  
c1  
D
45 (typ.)  
8.55  
5.8  
8.75  
6.2  
0.336  
0.228  
0.344  
0.244  
E
e
1.27  
7.62  
0.050  
0.300  
e3  
F
3.8  
4.6  
0.5  
4.0  
5.3  
0.149  
0.181  
0.019  
0.157  
0.208  
0.050  
0.026  
G
L
1.27  
0.68  
M
S
8 (max.)  
P013G  
6/8  
74VHC125  
TSSOP14 MECHANICAL DATA  
mm  
inch  
TYP.  
DIM.  
MIN.  
TYP.  
MAX.  
1.1  
MIN.  
MAX.  
0.433  
0.006  
0.374  
0.0118  
0.0079  
0.201  
0.256  
0.176  
A
A1  
A2  
b
0.05  
0.85  
0.19  
0.09  
4.9  
0.10  
0.9  
0.15  
0.95  
0.30  
0.20  
5.1  
0.002  
0.335  
0.0075  
0.0035  
0.193  
0.246  
0.169  
0.004  
0.354  
c
D
5
6.4  
0.197  
0.252  
E
6.25  
4.3  
6.5  
E1  
e
4.4  
4.48  
0.173  
0.65 BSC  
4o  
0.0256 BSC  
4o  
K
0o  
8o  
0o  
8o  
L
0.50  
0.60  
0.70  
0.020  
0.024  
0.028  
A2  
A
K
L
b
e
A1  
c
E
D
E1  
PIN 1 IDENTIFICATION  
1
7/8  
74VHC125  
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. Specification 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 trademark of STMicroelectronics  
1999 STMicroelectronics – Printed in Italy – All Rights Reserved  
STMicroelectronics GROUP OF COMPANIES  
Australia - Brazil - Canada - China -France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands -  
Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.  
http://www.st.com  
.
8/8  

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