M74HC126
Quad bus buffer (3-state)
Datasheet
-
production data
•
Balanced propagation delays:
t
PLH
≅
t
PHL
•
Wide operating voltage range:
V
CC
(opr) = 2 V to 6 V
•
Pin and function compatible with 74 series 126
SO14
TSSOP14
•
ESD performance
– CDM: 1 kV
– HBM: 2 kV
– MM: 200 V
Features
•
High-speed:
t
PD
= 8 ns (typ.) at V
CC
= 6 V
•
Low power dissipation:
I
CC
= 4
μA
(max.) at T
A
= 25 °C
•
High noise immunity:
V
NIH
= V
NIL
= 28 % V
CC
(min)
•
Symmetrical output impedance:
|I
OH
| = I
OL
= 6 mA (min.)
Description
The M74HC126 is a 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 into high
impedance state.
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
Table 1. Device summary
Order code
M74HC126RM13TR
M74HC126YRM13TR
(1)
M74HC126TTR
M74HC126YTTR
(1)
Temp. range
-55 °C to 125 °C
-40 °C to 125 °C
-55 °C to 125 °C
-40 °C to 125 °C
Package
S014
SO14 (automotive grade)
TSSOP14
TSSOP14 (automotive grade)
Packaging
Marking
74HC126
Tape and reel
74HC126Y
HC126
HC126Y
1. Qualification and characterization according to AEC Q100 and Q003 or equivalent, advanced screening according to AEC
Q001 and Q002 or equivalent.
December 2013
This is information on a product in full production.
DocID8021 Rev 3
1/14
www.st.com
Contents
M74HC126
Contents
1
2
3
4
Pin information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.1
4.2
SO14 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
TSSOP14 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5
6
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2/14
DocID8021 Rev 3
M74HC126
Pin information
1
Pin information
Figure 1. Pin connection and IED logic symbols
GAMS1212131410CB
Table 2. 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 (0 V)
Positive supply voltage
DocID8021 Rev 3
3/14
14
Functional description
M74HC126
2
Functional description
Table 3. Truth table
A
X
L
H
G
L
H
H
Y
Z
L
H
Figure 2. Input and output equivalent circuit
VCC
VCC
Input
Output
GND
GND
4/14
DocID8021 Rev 3
M74HC126
Electrical characteristics
3
Electrical characteristics
“Absolute maximum ratings” are those values beyond which damage to the device may
occur. Functional operation under these conditions is not implied.
Table 4. Absolute maximum ratings
Symbol
V
CC
V
I
V
O
I
IK
I
OK
I
O
I
CC
or
I
GND
P
D
T
stg
T
L
Supply voltage
DC input voltage
DC output voltage
DC input diode current
DC output diode current
DC output current
DC V
CC
or ground current
Power dissipation
Storage temperature
Lead temperature (10 sec)
Parameter
Value
-0.5 to +7
-0.5 to V
CC
+ 0.5
±
20
±
35
±
70
500
(1)
-65 to +150
300
mW
°C
mA
V
Unit
1. 500 mW at 65 °C; derate to 300 mW by 10 mW/°C from 65 °C to 85 °C
Table 5. Recommended operating conditions
Symbol
V
CC
V
I
V
O
T
op
Supply voltage
Input voltage
Output voltage
Operating temperature
V
CC
= 2.0 V
t
r
, t
f
Input rise and fall time
V
CC
= 4.5V
V
CC
= 6.0 V
Parameter
Value
2 to 6
0 to V
CC
-55 to 125
0 to 1000
0 to 500
0 to 400
ns
V
Unit
°C
DocID8021 Rev 3
5/14
14
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