Fairchild Semiconductor MM74C908N Datasheet

MM74C908
Dual CMOS 30-Volt Relay Driver

MM74C908 Dual CMOS 30-Volt Relay Driver

October 1987
Revised January 1999

General Description

The MM74C908 is a general purpose dual high voltage
driver capable of sourcing a minimum of 250 mA at V

− 3V, and TJ = 65°C.

V

CC

The MM74C908 consists of two CMOS NAND gates driv­ing an emitter follower Darlin gton output to achieve high

current drive and high voltage capabilities. In the “OFF”
state the outputs can withstand a maximum of −30V across
the device. These CMOS drivers are use ful in interfacing

OUT

normal CMOS voltage levels to driving relays, regulators,
lamps, etc.

=

Features

■ Wide supply voltage range: 3V to 18V

■ High noise immunity: 0.45 V

■ Low output “ON” resistance: 8Ω (typ.)

■ High voltage: −30V

■ High current: 250 mA

CC

(typ.)

Ordering Code:

Order Number Package Number Package Description

MM74C908N N08E 8-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide

Connection Diagram

Pin Assignments for DIP

Top View

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Absolute Maximum Ratings(Note 1)

Voltage at any Input Pin −0.3V to VCC +0.3V
Voltage at any Output Pin 32V
Operatin g Temp er at u re Ra ng e −40°C to +85°C

MM74C908

Operating V
Absolute Maximum V
I

SOURCE

Storage Temperature +150°C
Range (T

Range 4V to 18V

CC

CC

) −65°C to +150°C

S

19V

500 mA

Lead Temperature (T
(Soldering, 10 seconds) 260°C
Power Dissipation (P

Note 1: “Absolute Maxi mum Ratings” are those valu es beyond which the
safety of the device cannot be guaranteed. Ex ce pt for “O perating Tempera­ture Range” they are not mean t to imply that the devices sho uld be oper­ated at these limits. The Electrical Charac t eristics table provides co nditions
for actual device operation.

)

L

) Refer to Maximum Power

D

Dissipation vs Ambient

Temperature Graph

DC Electrical Characteristics

Min/Max limits apply across temperature range, unless otherwise noted

Symbol Parameter Conditions Min Typ Max Units

CMOS TO CMOS

V

IN(1)

V

IN(0)

I

IN(1)

I

IN(0)

I

CC

CMOS/LPTTL INTERFA CE

OUTPUT DRIVE

V

OUT

R

ON

θ

JA

Note 2: θJA measured in free air w it h device soldered into print ed circuit board.

Logical “1” Input Voltage VCC = 5V 3.5 V

Logical “0” Input Voltage VCC = 5V 1.5 V

Logical “1” Input Current VCC = 15V, VIN = 15V 0.005 1.0 µA
Logical “0” Input Current VCC = 15V, VIN = 0V −1.0 −0.005 µA
Supply Current VCC = 15V, Outputs Open Circuit 0.05 15 µA
Output “OFF” Voltage VIN = VCC, I

V

Logical “1” Input Voltage VCC = 4.75V VCC − 1.5 V

IN(1)

V

Logical “0” Input Voltage VCC = 4.75V 0.8 V

IN(0)

Output Voltage I

Output Resistance I

Output Resistance 0.55 0.80 %/°C
Coefficient
Thermal Resistance (Note 2) 100 110 °C/W
MM74C908 (Note 2) 45 55 °C/W

VCC = 10V 8.0 V

VCC = 10V 2.0 V

= −200 µA −30 V

OUT

= −300 mA, VCC ≥ 5V, TJ = 25°CVCC−2.7 VCC−1.8 V

OUT

I

= −250 mA, VCC ≥ 5V, TJ = 65°CVCC−3.0 VCC−1.9 V

OUT

I

= −175 mA, VCC ≥ 5V, TJ = 150°C VCC−3.15 VCC−2.0 V

OUT

= −300 mA, VCC ≥ 5V, TJ = 25°C6.09.0Ω

OUT

I

= −250 mA, VCC ≥ 5V, TJ = 65°C7.512Ω

OUT

I

= −175 mA, VCC ≥ 5V, TJ = 150°C1018Ω

OUT

AC Electrical Charac teristics (Note 3)

Symbol Parameter Conditions Min Typ Max Units

t

pd1

t

pd0

C

Note 3: AC Parameters are guara nt eed by DC correlated testing.
Note 4: Capacitance is guaranteed by periodic testing.

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Propagation Delay VCC = 5V, RL = 50Ω, 150 300 ns
to a Logical “1” CL = 50 pF, TA = 25°C

Propagation Delay VCC = 5V, RL = 50Ω, 2.0 10 µs
to a Logic “0” CL = 50 pF, TA = 25°C

Input Capacitance (Note 4) 5.0 pF

IN

VCC = 10V, RL = 50Ω, 65 120 ns
CL = 50 pF, TA = 25°C

VCC = 10V, RL = 50Ω, 4.0 20 µs
CL = 50 pF, TA = 25°C