M74HCT125
QUAD BUS BUFFER (3-STATE)
s
HIGH SPEED:
t
PD
= 13ns (TYP.) at V
CC
= 4.5V
LOW POWER DISSIPATION:
I
CC
= 4µA(MAX.) at T
A
=25°C
COMPATIBLE WITH TTL OUTPUTS :
V
IH
= 2V (MIN.) V
IL
= 0.8V (MAX)
BALANCED PROPAGATION DELAYS:
t
PLH
≅
t
PHL
SYMMETRICAL OUTPUT IMPEDANCE:
|I
OH
| = I
OL
= 6mA (MIN)
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 125
ORDER CODES
PACKAGE
DIP
SOP
TSSOP
TUBE
M74HCT125B1R
M74HCT125M1R
DIP
SOP
TSSOP
s
s
s
s
s
DESCRIPTION
The M74HCT125 is an high speed CMOS QUAD
BUFFER (3-STATE) fabricated with silicon gate
C
2
MOS technology.
The device requires the 3-STATE control input G
to be set high to place the output in to the high
impedance state.
PIN CONNECTION AND IEC LOGIC SYMBOLS
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The M74HCT125 is designed to directly interface
HSC
2
MOS systems with TTL and NMOS
components.
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
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M74HCT125RM13TR
M74HCT125TTR
s)
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T&R
August 2001
1/9
M74HCT125
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1, 4, 10, 13
2, 5, 9, 12
3, 6, 8, 11
7
14
SYMBOL
1G TO 4G
1A TO 4A
1Y TO 4Y
GND
V
CC
NAME AND FUNCTION
Output Enable Input
Data Inputs
Data Outputs
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
A
X
L
H
G
H
L
L
Y
Z
L
H
ABSOLUTE MAXIMUM RATINGS
Symbol
V
CC
V
I
V
O
I
IK
I
OK
I
O
Supply Voltage
DC Input Voltage
DC Output Voltage
DC Input Diode Current
DC Output Diode Current
DC Output Current
Parameter
Value
I
CC
or I
GND
DC V
CC
or Ground Current
P
D
Power Dissipation
T
stg
T
L
Storage Temperature
Lead Temperature (10 sec)
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
(*) 500mW at 65
°
C; derate to 300mW by 10mW/
°
C from 65
°
C to 85
°
C
RECOMMENDED OPERATING CONDITIONS
Symbol
V
CC
V
I
O
so
b
V
O
T
op
t
r
, t
f
te
le
Supply Voltage
Input Voltage
Output Voltage
ro
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P
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-0.5 to V
CC
+ 0.5
-0.5 to V
CC
+ 0.5
±
20
±
20
±
35
±
70
500(*)
-65 to +150
300
od
r
-0.5 to +7
s)
t(
uc
Unit
V
V
V
mA
mA
mA
mA
mW
°C
°C
Parameter
Value
4.5 to 5.5
0 to V
CC
0 to V
CC
-55 to 125
0 to 500
Unit
V
V
V
°C
ns
Operating Temperature
Input Rise and Fall Time (V
CC
= 4.5 to 5.5V)
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M74HCT125
DC SPECIFICATIONS
Test Condition
Symbol
Parameter
V
CC
(V)
4.5
to
5.5
4.5
to
5.5
4.5
4.5
5.5
5.5
5.5
5.5
I
O
=-20
µA
I
O
=-6.0 mA
I
O
=20
µA
I
O
=6.0 mA
V
I
= V
CC
or GND
V
I
= V
IH
or V
IL
V
O
= V
CC
or GND
V
I
= V
CC
or GND
Per Input pin
V
I
= 0.5V or
V
I
= 2.4V
Other Inputs at
V
CC
or GND
I
O
= 0
T
A
= 25°C
Min.
2.0
Typ.
Max.
Value
-40 to 85°C
Min.
2.0
Max.
-55 to 125°C
Min.
2.0
Max.
V
Unit
V
IH
High Level Input
Voltage
Low Level Input
Voltage
High Level Output
Voltage
Low Level Output
Voltage
Input Leakage
Current
High Impedance
Output Leakage
Current
Quiescent Supply
Current
Additional Worst
Case Supply
Current
V
IL
0.8
4.4
4.18
4.5
4.31
0.0
0.17
0.1
0.26
±
0.1
±
0.5
4
2.0
4.4
4.13
0.8
4.4
4.10
0.1
0.33
±
1
±
5
0.8
V
V
OH
V
OL
I
I
I
OZ
V
0.1
0.40
V
µA
I
CC
∆
I
CC
AC ELECTRICAL CHARACTERISTICS
(C
L
= 50 pF, Input t
r
= t
f
= 6ns)
Test Condition
Symbol
Parameter
t
TLH
t
THL
Output Transition
Time
t
PLH
t
PHL
Propagation Delay
Time
O
so
b
t
PZL
t
PZH
Output Enable
Time
t
PLZ
t
PHZ
Output Disable
Time
te
le
ro
P
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d
V
CC
(V)
4.5
4.5
4.5
4.5
4.5
4.5
C
L
(pF)
50
s)
t(
so
b
-O
Min.
7
13
17
15
19
17
te
le
r
P
od
40
2.9
s)
t(
uc
±
1
±
10
80
3.0
µA
µA
mA
Value
-40 to 85°C
Min.
Max.
15
26
34
30
38
30
-55 to 125°C
Min.
Max.
18
32
41
36
45
36
ns
ns
ns
ns
Unit
T
A
= 25°C
Typ.
Max.
12
21
27
24
30
24
50
150
50
150
50
R
L
= 1 K
Ω
R
L
= 1 K
Ω
3/9
M74HCT125
CAPACITIVE CHARACTERISTICS
Test Condition
Symbol
Parameter
V
CC
(V)
T
A
= 25°C
Min.
Typ.
5
56
Max.
10
Value
-40 to 85°C
Min.
Max.
10
-55 to 125°C
Min.
Max.
10
pF
pF
Unit
C
IN
C
PD
Input Capacitance
Power Dissipation
Capacitance (note
1)
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
TEST CIRCUIT
TEST
t
PLH
, t
PHL
t
PZL
, t
PLZ
t
PZH
, t
PHZ
C
L
= 50pF/150pF or equivalent (includes jig and probe capacitance)
R
1
= 1KΩ or equivalent
R
T
= Z
OUT
of pulse generator (typically 50Ω))
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SWITCH
Open
V
CC
GND
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M74HCT125
WAVEFORM 1 : PROPAGATION DELAY TIMES
(f=1MHz; 50% duty cycle)
WAVEFORM 2 : OUTPUT ENABLE AND DISABLE TIMES
(f=1MHz; 50% duty cycle)
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