Intersil Corporation CA3098 Datasheet

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NO RECOMMENDED REPLACEMENT

Call Central Applications 1-800-442-7747

or email: [e-mail]

Programmable Schmitt Trigger with
Memory, Dual Input Precision Level
Detector

The CA3098 Programmable Schmitt Trigger is a monolithic
silicon integrated circuit designed to control high operating
current loads such as thyristors, lamps, relays, etc. The
CA3098 can be operated with either a single power supply
with maximum operating voltage of 16V, or a dual power
supply with maximum operating voltage of ±8V. It can
directly control currents up to 150mA and operates with
microwatt standby power dissipation when the current to be
controlled is less than 30mA. The CA3098 contains the
following major circuit function features (see Block Diagram):

1. Differentialamplifiers and summer: the circuit uses two
differential amplifiers, one to compare the input voltage
with the “high” reference, and the other to compare the
input with the “low” reference. The resultant output of the
differentialamplifiersactuatesa summer circuit which de­liversa trigger that initiates a change in state of a flip-flop.

2. Flip-flop: the flip-flop functions as a bistable “memory”
element that changes state in response to each trigger
command.

3. Driver and output stages: these stages permitthe circuit
to “sink” maximum peak load currents up to 150mA at ter­minal 3.

4. Programmable operating current: the circuit incorporates
access at terminal 2 to permit programming the desired
quiescent operating current and performance parameters.

Pinout

CA3098

(PDIP)

TOP VIEW

LOW REF.

I

BIAS

OUT

1
2
3
4

V-

1

8

+IN

7

HIGH REF.

6

V+

5

CURRENT
CONTROL

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

January 1999 File Number 896.5

Features

• Programmable Operating Current

• Micropower Standby Dissipation

• Direct Control of Currents Up to. . . . . . . . . . . . . . . 150mA

• Low Input On/Off Current of Less Than 1nA for
Programmable Bias Current of 1µA

• Built-in Hysteresis. . . . . . . . . . . . . . . . . . . . . . 20mV (Max)

Applications

• Control of Relays, Heaters, LEDs, Lamps, Photosensitive
Devices, Thyristors, Solenoids, etc.

• Signal Reconditioning

• Phase and Frequency Modulators

• On/Off Motor Switching

• Schmitt Triggers, Level Detectors

• Time Delays

• Overvoltage, Overcurrent, Ov ertemperature Protection

• Battery-Operated Equipment

• Square and Triangular-Wave Generators

Part Number Information

PART

NUMBER

CA3098E -55 to 125 8 Ld PDIP E8.3

TEMP

RANGE (oC) PACKAGE PKG. NO.

© Harris Corporation 1999

Copyright

Block Diagram

“HIGH”
REF. (HR)

SIGNAL
INPUT

“LOW”
REF. (LR)

Schematic Diagram

CA3098

PROGRAMMABLE

2

BIAS CURRENT
INPUT (I

7

8

1

DIFF.
AMP

DIFF.
AMP

COMPARATOR

SUMMER

FLIP-FLOP
(MEMORY)

)

BIAS

DRIVER OUTPUT

SUBSTRATE

6

V+

OUTPUT
CURRENT
CONTROL

5

“SINK

OUTPUT”

3

4

V-

“HIGH”

REF. (HR)

7

SIGNAL

INPUT

8

“LOW”

REF. (LR)

1

V-

4

6

OUTPUT
CURRENT
CONTROL

R

14

500Ω

“SINK”

OUTPUT

Q

46

BIAS

V+

5

3

2

)

Q

8

Q

Q

6

Q

Q

7

9

10

Q

Q

1

Q

2

Q

5

Q

16

Q

Q

12

Q

4

Q

3

14

Q

15

Q

Q

17

Q

18

Q

20

Q

24

Q

11

Q

26

Q

34

19

Q

35

22

Q

27

Q

31

Q

32

Q

23

Q

25

Q

28

Q

30

Q

Q

33

Q

Q

36

Q

Q

39

Q

40

Q

41

29

Q

43

37

38

Q

Q

Q

44

R

3

50K

PROGRAMMABLE

BIAS CURRENT

INPUT (I

42

45

2

CA3098

Absolute Maximum Ratings Thermal Information

Supply Voltage Between V+ and V-. . . . . . . . . . . . . . . . . . . . . . .16V

Voltage Between High Reference or Sink Output and V-. . . . . . .16V

Differential Input Voltage Between Terminals 8 and 1 . . . . . . . . .10V

and Terminals 7 and 8

Load Current (Terminal 3) (Duty Cycle ≤25%). . . . . . . . . . . . 150mA

Input Current to Voltage Regulator (Terminal 5) . . . . . . . . . . . 25mA

Programmable Bias Current (Terminal 2) . . . . . . . . . . . . . . . . . 1mA

Output Current Control (Terminal 5) . . . . . . . . . . . . . . . . . . . . 15mA

Operating Conditions

Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . -55oC to 125oC

Voltage Range

+IN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V- to V+

HIGH REF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (V- +2.0V) to V+

LOW REF. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (V-) to (V+ -2.0V)

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operationofthe
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

Thermal Resistance (Typical, Note 3) θ

PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125oC/W

JA

Maximum Junction Temperature (Die). . . . . . . . . . . . . . . . . . .175oC

Maximum Junction Temperature (Plastic Package). . . . . . . . .150oC

Maximum Storage Temperature Range. . . . . . . . . . -65oC to 150oC

Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC

Electrical Specifications T

= 25oC, Unless Otherwise Specified

A

CA3098

PARAMETER SYMBOL TEST CONDITIONS

Input Offset Voltage

“Low” Reference (Figures 2, 5) V

“High Reference (Figures 2, 6) V

IO(LR)VLR

IO(HR)VHR

= GND, VHR = V+ to (V- +2V),

I

= 100µA

BIAS

= GND, VLR = V- to (V+ -2V),

I

= 100µA

BIAS

-15 -3 6 mV

-10 -1 10 mV

Temperature Coefficient

“Low” Reference (Figure 7) -55oC to 125oC - 4.5 - µV/oC
“High” Reference (Figure 8) -55oC to 125oC-±8.2 - µV/oC

Minimum Hysteresis

Voltage (Figure 9) V

IO(HR-

LR)

V

= 0V (Note 1), V+ = 4V, V- = -4V, I

REG

= 1µA

IAS

B-

- 3 20 mV

Temperature Coefficient (Figure 10) -55oC to 125oC - 6.7 - µV/oC

Output Saturation Voltage
(Figures 11, 12)

Total Supply Current I

“ON” (Figures 3, 13, 14) VI = 6V, V

“OFF” (Figures 3, 13, 14) VI = 10V, V

Input Bias Current (Figures 3, 15) I

I

B(PNP)

I

B(NPN)

Output Leakage Current I
Switching Times (Figures 4, 16-27) I

Delay Time t
Fall Time t
Rise Time t
Storage Time t

Output Current (Note 2) I

V

CE(SAT)VI

TOTAL

IB

CE(OFF)

D

F

R

S

O

= 5V, V

I

= 100µA

BIAS

I

= 100µA

BIAS

V+ = 16V, I

VI = 16V, V
V+ = 16V, I

VI = 6V, V
I

= 100µA

BIAS

= 6V (Note 1), V+ = 12V,

REG

> 6V (Note 1), V+ = 16V,

REG

< 10V (Note 1),

REG

= 100µA

BIAS

< 16V (Note 1),

REG

= 100µA

BIAS

> 6V (Note 1), V+ = 16V,

REG

- 0.72 1.2 V

500 710 800 µA

400 560 750 µA

- 42 100 nA

- 28 100 nA

Current from Terminal 3 when Q46 is “OFF” - - 10 µA

= 100µA, V+ = 5V, V

BIAS

(Note 1)

REG

= 2.5V

- 900 - ns

-30-ns

- 2000 - ns

- 6.5 - µs

100 - - mA

NOTES:

1. For definition of V

see Figure 3.

REG

2. Continuous (DC) output current must be limited to ≤40mA. For 100mA output current, the duty cycle must be ≤40%.

3. θJA is measured with the component mounted on an evaluation PC board in free air.

UNITSMIN TYP MAX

3

CA3098

General Description of Circuit Operation

When the signal input voltage of the CA3098 is equal to or
less than the “low” reference voltage (LR), current flowsfrom
an external power supply through a load connected to
Terminal 3 (“sink” output). This condition is maintained until
the signal input voltage rises to or exceeds the “high”
reference voltage (HR), thereby effecting a change in the
state of the flip-flop (memory) such that the output stage
interrupts current flow in the external load. This condition, in
turn, is maintained until such time as the signal again
becomes equal to or less than the “low” reference voltage.

The CA3098 comparator is unique in that it contains circuit
provisions to permit programmability. This feature provides
flexibility to the designer to optimize quiescent power
consumption, input circuit characteristics, hysteresis, and
additionally permits independent control of the comparator,
namely, pulsing, strobing, keying, squelching, etc.
Programmability is accomplished by means of the bias
current (I

An auxiliary means of controlling the magnitude of load
current flowat Terminal3 is provided by “sinking” current into
Terminal 5. Figure 1 highlights the operation of the CA3098
when connected as a simple hysteresis switch (Schmitt
trigger).

) supplied to Terminal 2.

BIAS

120kΩ

R

B

2

“HIGH” REF. = 8V

7

INPUT

SIGNAL

E

IN

“LOW” REF. = 4V

INPUT SIGNAL

SEQUENCE

14≥ EIN > 0 0
28≥ EIN > 4 0
3E
28≥ EIN > 4 12
14≥ EIN > 0 0

FIGURE 1. BASIC HYSTERESIS SWITCH (SCHMITT

TRIGGER) AND RESULTANT OUTPUT STATES

8

1

LEVEL

> 8 12

IN

6

5

CA3098

4

OUTPUT VOLTAGE (V)

(TERMINAL 3)

V+ = 12V

3

DC

I

O

R

L

E

O

Metallization Mask Layout

0 102030 405058

61

60

50

40

30

20

10

0

63 (1.600)

66 (1.676)

Dimensions in parentheses are in millimeters and are derived
from the basic inch dimensions as indicated. Grid graduations
are in mils (10

-3

inch).

The layout represents a chip when it is part of the wafer. When
the wafer is cut into chips, the cleavage angles are 57

o

of 90

with respect to the face of the chip. Therefore, the

o

instead

isolated chip is actually 7mils (0.17mm) larger in both
dimensions.

4