Siemens TCA965B Datasheet

Window Discriminator

TCA 965 B

Preliminary Bipolar IC

Features

● Two window settings

– direct setting of lower and upper edge

voltage (window edges)

– indirect setting by window center

voltage and half window width

● Adjustable hysteresis

● Digital outputs with open collectors

for currents up to 50 mA

● Adjustable reference voltage V

Stab

P-DIP-14-1

Type Ordering Code Package

■ TCA 965 B Q67000-A8338 P-DIP-14-1

■ Not for new design

The window discriminator compares an input voltage to a defined voltage window. The
digital outputs show whether the input voltage is below, within or above this window.

The TCA 965 B window discriminator is especially suitable as a tracking or
compensating controller with a dead band in control engineering and for the selection of
DC voltages within a certain tolerance of the required setpoint value in measurement
engineering. When it is used as a Schmitt trigger, switching frequencies up to a typical
value of 50 kHz are possible.

Semiconductor Group 1 1998-02-10

Functional Description

TCA 965 B

Amplifier Amp 3 increases the voltage of the reference source

R to V

= 2 x V

Stab

REF

. The
amplification factor can be altered by external wiring. With direct setting of the window,
the input voltage appears on amplifier Amp 1 (
comparator K2 (

V

) and the lower edge voltage on comparator K1 (V7).

6

With indirect setting of the window, the input voltage appears on inputs
the center voltage is connected to amplifier A1 (

V

The voltage applied to the input (

) of amplifier Amp 2 is subtracted symmetrically from

9

V

V

), the upper edge voltage on

8

V

and V7, while

6

).

8

the output voltage of amplifier Amp 1 and added. The comparators switch with
hysteresis. The logic gates have open-collector outputs.

If the inhibit input A or B is connected to ground, output A or B will always be high.

+

VV

S

11 1 5

R

REF

20 kΩ20 kΩ

_

Amp 3

+

10

V

Stab

V

V

V

V

7

7

Amp 1

8

8

V = 1

Amp 2

9

9

V = 1

6

6

_

+

+

_

Outputs A, B, C, D are open-collector

+

K1

_

+

K2

_

1

_

<

1

1

1

2

4

13

3

12

14

IEB00091

A

Inhibit A

C

D

Inhibit B

B

Block Diagram

Semiconductor Group 2 1998-02-10

Pin Configuration

(top view)

TCA 965 B

TCA 965 B

GND

A
D

Inhibit A

V

REF

V
V

1
2
3
4
5
6

6

7

7

14
13
12
11
10

9
8

IEP00292

B
C
Inhibit B

V

+

S

V

Stab

V

9

V

8

Pin Definitions and Functions
Pin Symbol Pin Function in

Direct Setting Indirect Setting

of Window

1
2
3
4
5

6
7
8
9

10
11
12
13
14

GND
A
D
Inhibit A

V

REF

V

6

V

7

V

8

V

9

V

Stab

+ V

S

Inhibit B
C
B

GND

Logic output A

Logic output D = A @ B (AND)

Connected to GND: logic output A = HIGH

Internal

Upper edge voltage
Lower edge voltage

Input voltage

GND

Internal

V

V

REF

Stab

= 3 V

Input voltage
Input voltage V

Center voltage

Half window width

= 6 V

Supply voltage

Connected to GND: logic output B = HIGH

Logic output C = A @ B (NAND)

Logic output B

V

6/7
6/7

Semiconductor Group 3 1998-02-10

TCA 965 B

Absolute Maximum Ratings

Maximum ratings for ambient temperature

Parameter Symbol Limit Values Unit

T

= – 25 to 85 °C

A

min. max.

Supply voltage (pin 11)
Difference in input voltage between pins 6, 7, 8
Input voltage (pins 6, 7, 8, 9)

Output current (pins 2, 3, 13, 14)
Output voltage (pins 2, 3, 13, 14)

independent of
Voltage on V

V

REF

S

(pin 5)
Output current of stabilized voltage (pin 10)
Inhibit input voltage (pins 4, 12)
Junction temperature

Storage temperature
Thermal resistance system - air P-DIP-14-1

Operating Range

V
V
V

I

V
V

I
V
T

T
R

S
I
I

Q

Q
R

10

IH

j
stg

th SA

–
–
–

30
15
30

V
V

V
–50mA
–

–
–

30
8

V

V
–10mA
–7V

–55

150
125

°C

°C

– 80 K/W

Supply voltage
Ambient temperature

V
T

S

A

4.5 30 V
–25 85 °C

Semiconductor Group 4 1998-02-10

Characteristics

V

= 10 V; TA= 25 °C

S

TCA 965 B

Parameter Symbol Limit Values Unit Test

Condition

min. typ. max.

Current consumption

I

S

–

5

7

mA

V

,

V

2

Input current
(pins 6, 7, 8)
Input current, pin 9

I

I

–I

–

I

–

20
400

50
3000

nA
nA

Input offset voltage in
direct setting of window

V

IO

–20

20

mV
Input offset voltage in
indirect setting of window

V

IO

–50

50

mV
Input-voltage range on
pins 6, 7, 8

V

I

1.5

V

S

–1

V

∆

V

I

Input-voltage range on
pin 9
Differential input voltage

V

V

(

V

I

–(

6

8

50

V

–

V

)

8

9

+

V

)–

V

9

7

V

13
13

S

/2

mV

V

V

=

V

13

QH

<13V

Test
Circuit

1
1

1

1
2
1
2

Reference voltage
Stabilized voltage on
pin 10
TC of reference voltage
Sensitivity of reference
voltage to supply-voltage
variation

Output reverse current
Output saturation voltage

Hysteresis of window
edges
Inhibit threshold

Inhibit current
Switching frequency

V

5

V

10

αV

5

∆V5/∆V

I

QH

V

QL

V

– V

U

V

4, 12

I

4, 12

f

dir

f

ind

2.8

5.536

3.2

6.5

0.4

S

2

V

V

mV/K

mV/V

I

= 0

REF

V

> 7.9 V

S

––10µA– –

100
500

L

18

22

1
–

–

– 100
2050–

–

200
800

35

1.8
– µA– –

–

mV

mV

mV

V

kHz

kHz––

I

= 10 mA

Q

I

= 50 mA

Q

1

1
2

Semiconductor Group 5 1998-02-10

TCA 965 B

V

S

Ι

S11

11

6

Ι

62

3

13

Ι

Ι

7

7

TCA 965B

14

10

Ι

8

Ι

8

5

RLRLRLR

ΙΙ

QH2

Ι

QH3

Ι

QH13

Ι

QH14

L

= ==

V

V

6

V

7

914 12

8

Ι

Ι

Test Circuit 1
Direct Setting of Window

V

9

V V

= =

4

5

12

V

10

V

QL14

V

QL13

V

QL3

V

QL2

IES00086

Semiconductor Group 6 1998-02-10