74VHCT125 [STMICROELECTRONICS]
QUAD BUS BUFFERS 3-STATE; 四路总线缓冲器三态
| 型号： | 74VHCT125 |
| 厂家： | 
ST |
| 描述： | QUAD BUS BUFFERS 3-STATE |
| 文件： | 总8页 (文件大小：63K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
74VHCT125A
QUAD BUS BUFFERS (3-STATE)
PRELIMINARY DATA
■
■
HIGH SPEED:tPD =3.8ns (TYP.) atVCC = 5V
LOW POWER DISSIPATION:
ICC =4 µA (MAX.) at TA =25 oC
COMPATIBLEWITH TTL OUTPUTS:
VIH =2V (MIN), VIL = 0.8V(MAX)
POWERDOWN PROTECTIONON INPUTS&
OUTPUTS
SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 8 mA (MIN)
BALANCEDPROPAGATIONDELAYS:
tPLH tPHL
OPERATING VOLTAGERANGE:
VCC (OPR)= 4.5V to 5.5V
■
■
■
■
■
■
M
T
(Micro Package)
(TSSOPPackage)
ORDER CODES :
74VHCT125AM
74VHCT125AT
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 outputs and 0 to 7V can be accepted on
inputs with no regard to the supply voltage. This
device can be used to interface 5V to 3V.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
PIN AND FUNCTION COMPATIBLEWITH
74 SERIES125
■
■
IMPROVED LATCH-UP IMMUNITY
LOWNOISE:VOLP = 0.8V(Max.)
DESCRIPTION
The 74VHCT125A 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
August 1999
74VHCT125A
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 Impadance
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 +7.0
-0.5 to VCC + 0.5
- 20
DC Input Voltage
V
VO
DC Output Voltage (see note 1)
DC Output Voltage (see note 2)
DC Input Diode Current
DC Output Diode Current
DC Output Current
V
VO
V
IIK
mA
mA
mA
mA
oC
oC
IOK
± 20
IO
± 25
ICC or IGND DC VCC or Ground Current
± 50
Tstg
Storage Temperature
-65 to +150
TL
Lead Temperature (10 sec)
300
AbsoluteMaximum Ratingsarethose values beyond whichdamage tothe device may occur. Functional operation under these condition isnot implied.
1)Outputin OFFState
2)High or Low State
RECOMMENDED OPERATING CONDITIONS
Symbol
VCC
VI
Parameter
Value
4.5 to 5.5
0 to 5.5
Unit
V
Supply Voltage
Input Voltage
V
VO
Output Voltage (see note 1)
0 to 5.5
V
VO
Output Voltage (see note 2)
0 to VCC
-40 to +85
0 to 20
V
oC
Top
Operating Temperature
dt/dv
ns/V
Input Rise and Fall Time (see note 3) (VCC = 5.0 ± 0.5V)
1)Outputin OFFState
2)High or Low State
3)VIN from0.8Vto2 V
2/8
74VHCT125A
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
4.5 to 5.5
2
2
V
V
Low Level Input
Voltage
4.5 to 5.5
0.8
0.8
VOH
High Level Output
Voltage
4.5
4.5
IO=-50
A
4.4
4.5
0.0
4.4
3.8
µ
V
IO=-8 mA
IO=50
3.94
VOL
Low Level Output
Voltage
4.5
A
0.1
0.36
±0.25
0.1
µ
V
4.5
IO=8 mA
0.44
±2.5
IOZ
High Impedance
Output Leakage
Current
4.5 to 5.5
VI = VIH or VIL
VO = 0V to 5.5V
µA
II
Input Leakage Current
0 to 5.5
5.5
VI = 5.5V or GND
VI = VCC or GND
±0.1
±1.0
µA
ICC
Quiescent Supply
Current
4
40
A
µ
∆ICC
Additional Worst Case
Supply Current
5.5
0
One Input at 3.4V,
other input at VCC or
GND
1.35
0.5
1.5
5.0
mA
IOPD
Output Leakage
Current
VOUT = 5.5V
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
5.0(*)
5.0(*)
5.0(*)
5.0(*)
5.0(*)
15
50
15
50
50
R = 1K
3.8
5.3
3.6
5.1
6.1
5.5
7.5
5.1
7.1
8.8
1.0
1.0
1.0
1.0
1.0
6.5
8.5
Ω
L
ns
ns
ns
RL = 1KΩ
tPLZ
tPHZ
Output Disable Time
R = 1K
6.0
Ω
L
RL = 1KΩ
8.0
tPZL
tPZH
Output Enable Time
R = 1K
10.0
Ω
L
(*) Voltagerangeis5.0V ± 0.5V
3/8
74VHCT125A
CAPACITIVE CHARACTERISTICS
Symbol
Parameter
Test Conditions
Value
TA = 25 oC
Min. Typ. Max. Min. Max.
Unit
-40 to 85 oC
CIN
Input Capacitance
4
10
10
pF
pF
pF
COUT Output Capacitance
10
14
CPD
Power Dissipation
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
2
-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)
0.8
1)Worstcase package.
2)Max number ofoutputs defined as (n). Datainputs aredriven 0Vto3.0V, (n -1)outputs switching andone outputatGND.
3)Max number ofdatainputs (n)switching.(n-1)switching 0Vto3.0V. Inputsunder testswitching: 3.0Vtothreshold (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
74VHCT125A
WAVEFORM 1: PROPAGATION DELAYS
(f=1MHz; 50% duty cycle)
WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle)
5/8
74VHCT125A
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
74VHCT125A
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
74VHCT125A
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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
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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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8/8
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