MM74C914 Hex Schmitt Trigger with Extended Input Voltage
October 1987
Revised January 1999
MM74C914
Hex Schmitt Trigger with Extended Input Voltage
General Description
The MM74C914 is a monolithic CMOS Hex Schmitt trigger
with special input protection scheme. This scheme allows
the input voltage levels to exceed V
CC
or ground by at least
10V (V
CC
−25V
to GND
+
25V), and is valuable for applica-
tions involving voltage level shifting or mismatched power
supplies.
The positive and negative-going threshold voltages, V
T+
and V
T−
, show low variation with respect to temperature
(typ 0.0005V/°C at V
CC
=
10V). And the hysteresis, V
T+
−
V
T−
≥
0.2 V
CC
is guaranteed.
Features
s
Hysteresis:
s
Special
Range
0.45 V
CC
(typ.) 0.2 V
CC
guaranteed
protection: Extended
Input
Voltage
input
s
Wide supply voltage range: 3V to 15V
s
High noise immunity: 0.7 V
CC
(typ.)
s
Low power TTL compatibility:
Fan out of 2 driving 74L
Ordering Code:
Order Number
MM74C914M
MM74C914N
Package Number
M14A
N14A
Package Description
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150” Narrow
14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Connection Diagrams
Pin Assignments for DIP
Special Input Protection
Top View
8V
≈
25V
for the diodes.
© 1999 Fairchild Semiconductor Corporation
DS005917.prf
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MM74C914
Absolute Maximum Ratings
(Note 1)
Voltage at any Input Pin
Voltage at any other Pin
Operating Temperature Range (T
A
)
Storage Temperature Range (T
S
)
Power Dissipation
Dual-In-Line
Small Outline
700 mW
500mW
V
CC
−
25V to GND
+
25V
−0.3Vto
V
CC
+
0.3V
−40°C
to
+85°C
−65°C
to
+150°C
Operating V
CC
Range
Absolute Maximum (V
CC
)
Lead Temperature (T
L
)
(Soldering, 10 seconds)
3V to 15V
18V
300°C
Note 1:
“Absolute Maximum Ratings” are those values beyond which the
safety of the device cannot be guaranteed. Except for “Operating Tempera-
ture Range”, they are not meant to imply that the devices should be oper-
ated at these limits. The Electrical Characteristics tables provide conditions
for actual device operation.
DC Electrical Characteristics
Min/Max limits apply across temperature range unless otherwise noted
Symbol
CMOS TO CMOS
V
T+
Positive Going Threshold Voltage
V
CC
=
5V
V
CC
=
10V
V
CC
=
15V
V
T−
Negative Going Threshold Voltage
V
CC
=
5V
V
CC
=
10V
V
CC
=
15V
V
T+
−
V
T−
Hysteresis
V
CC
=
5V
V
CC
=
10V
V
CC
=
15V
V
OUT(1)
V
OUT(0)
I
IN(1)
I
IN(0)
I
CC
Logical“1” Output Voltage
Logical “0” Output Voltage
Logical “1” Input Current
Logical “0” Input Current
Supply Current
V
CC
=
5V, I
O
= −10 µA
V
CC
=
10V, I
O
= −10 µA
V
CC
=
5V, I
O
= +10 µA
V
CC
=
10V, I
O
= +10 µA
V
CC
=
15V, V
IN
=
25V
V
CC
=
15V, V
IN
= −10V
V
CC
=
15V, V
IN
= −
10V/25V
V
CC
=
5V, V
IN
= −
2.5V (Note 2)
V
CC
=
10V, V
IN
=
5V (Note 2)
V
CC
=
15V, V
IN
=
7.5V (Note 2)
CMOS/LPTTL INTERFACE
V
IN(1)
V
IN(0)
V
OUT(1)
V
OUT(0)
I
SOURCE
I
SOURCE
I
SINK
I
SINK
Logical “1” Input Voltage
Logical “0” Input Voltage
Logical “1” Output Voltage
Logical “0” Output Voltage
Output Source Current
(P-Channel)
Output Source Current
(P-Channel)
Output Sink Current
(N-Channel)
Output Sink Current
(N-Channel)
Note 2:
Only one input is at ½ V
CC
, the others are either at V
CC
or GND.
Parameter
Conditions
Min
Typ
Max
Units
3.0
6.0
9.0
0.7
1.4
2.1
1.0
2.0
3.0
4.5
9.0
3.6
6.8
10
1.4
3.2
5
2.2
3.6
5
4.3
8.6
12.9
2.0
4.0
6.0
3.6
7.2
10.8
V
V
V
V
V
V
V
V
V
0.5
1.0
0.005
−100
−0.005
0.05
20
200
600
4.3
0.7
2.4
0.4
−1.75
−8.0
1.75
8.0
−3.3
−15
3.6
16
300
5.0
V
V
µA
µA
µA
µA
µA
µA
V
V
V
V
mA
mA
mA
mA
V
CC
=
5V
V
CC
=
5V
V
CC
=
4.75V, I
O
= −360 µA
V
CC
=
4.75V, I
O
=
360
µA
V
CC
=
5V, V
OUT
=
0V, T
A
=
25°C
V
CC
=
10V, V
OUT
=
0V, T
A
=
25°C
V
CC
=
5V, V
OUT
=
V
CC
, T
A
=
25°C
V
CC
=
10V, V
OUT
=
V
CC
, T
A
=
25°C
OUTPUT DRIVE (See Family Characteristics Data Sheet) (Short Circuit Current)
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2
MM74C914
AC Electrical Characteristics
T
A
=
25°C, C
L
=
50 pF, unless otherwise specified
Symbol
t
PHL
t
PLH
C
IN
C
PD
Input Capacitance
Power Dissipation Capacitance
Parameter
(Note 3)
Conditions
Min
Typ
220
80
5
20
Max
400
200
Units
ns
ns
pF
pF
Propagation Delay from Input to Output V
CC
=
5V
V
CC
=
10V
Any Input (Note 4)
Per Gate (Note 5)
Note 3:
AC Parameters are guaranteed by DC correlated testing.
Note 4:
Capacitance is guaranteed by periodic testing.
Note 5:
C
PD
determines the no load AC power consumption of any CMOS device. For complete explanation see Family Characteristics Application Note,
AN-90.
Typical Performance Characteristics
Typical Transfer Characteristics
Guaranteed Trip Point Range
Typical Application
Note:
V
CC1
=
V
CC2
GND1
=
GND2
3
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MM74C914
Physical Dimensions
inches (millimeters) unless otherwise noted
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150” Narrow
Package Number M14A
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4
MM74C914 Hex Schmitt Trigger with Extended Input Voltage
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
Package Number N14A
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
2. A critical component in any component of a life support
1. Life support devices or systems are devices or systems
device or system whose failure to perform can be rea-
which, (a) are intended for surgical implant into the
sonably expected to cause the failure of the life support
body, or (b) support or sustain life, and (c) whose failure
device or system, or to affect its safety or effectiveness.
to perform when properly used in accordance with
instructions for use provided in the labeling, can be rea-
sonably expected to result in a significant injury to the
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user.
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications.
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