Datasheet TCF6000D, TCF6000 Datasheet (Motorola)

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Order this document by TCF6000/D

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The TCF6000 was designed to protect input/output lines of

microprocessor systems against voltage transients.

• Optimized for HMOS System

• Minimal Component Count

• Low Board Space Requirement

• No P.C.B. Track Crossovers Required

• Applications Areas Include Automotive, Industrial,

Telecommunications and Consumer Goods

Figure 1. Representative Block Diagram and

Simplified Application

V

V

CC

V

Gnd

Ref

Generator

V

Ref

Pin

DD

PERIPHERAL CLAMPING

ARRAY

SEMICONDUCTOR

TECHNICAL DATA

D SUFFIX

PLASTIC PACKAGE

8

1

NO SUFFIX

PLASTIC PACKAGE

CASE 626

PIN CONNECTIONS

Gnd

1
2

Clamp

3

Clamp

45

Clamp

CASE 751

(SO–8)

V

8

CC

7

Clamp

6

Clamp
Clamp

Gnd

Each Cell

Digital
Inputs

Analog

Inputs

R

in

Gnd

MOTOROLA ANALOG IC DEVICE DATA

Micro

Computer

ORDERING INFORMATION

Operating

C

in

Device

TCF6000D
TCF6000

 Motorola, Inc. 1996 Rev 0

Temperature Range

TA = – 40° to +85°C

Package

SO–8

Plastic DIP

1

TCF6000

MAXIMUM RATINGS

Supply Voltage V
Supply Current I
Clamping Current I
Junction Temperature T
Power Dissipation (TA = + 85°C) P
Thermal Resistance (Junction–Ambient) θ
Operating Ambient Temperature Range T
Storage Temperature Range T

NOTE: 1. Values beyond which damage may occur .

ELECTRICAL CHARACTERISTICS (T

Positive Clamping Voltage (Note 2)

(IIK = 10 mA, –40°C ≤ TA ≤ + 85°C)
Positive Peak Clamping Current I
Negative Peak Clamping Voltage

(IIK = –10 mA, –40°C ≤ TA ≤ + 85°C)
Negative Peak Clamping Current I
Output Leakage Current

(0 V ≤ Vin ≤ VCC)

(0 V ≤ Vin ≤ VCC, –40°C ≤ TA ≤ + 85°C)
Channel Crosstalk (ACT = 20 log IL/IIK) A
Quiescent Current (Package) I

NOTE: 2. The device might not give 100% protection in CMOS applications.

(TA = 25°C, unless otherwise noted, Note 1.)

Rating

Characteristics

Symbol Value Unit

CC

i

IK

J

D

JA

A

stg

= 25°C, 4.5 ≤ VCC ≤ 5.5 V, unless otherwise noted.)

A

6.0 V
300 mA
±50 mA
150 °C
400 m/W
100 °C/W

–40 to +85 °C

–55 to + 150 °C

Symbol Min Max Unit

V

(IK)

IK(P)

V

(IK)

IK(P)

I

L

I

LT

CT

B

– VCC + 1.0 V

– 20 mA

–0.3 – V

–20 – mA

–
–

100 – dB

– 2.0 mA

1.0

5.0

µA

CIRCUIT DESCRIPTION

To ensure the reliable operation of any integrated circuit
based electronics system, care has been taken that voltage
transients do not reach the device I/O pins. Most NMOS,
HMOS and Bipolar integrated circuits are particularly
sensitive to negative voltage peaks which can provoke
latch–up or otherwise disturb the normal functioning of the
circuit, and in extreme cases may destroy the device.

Generally the maximum rating for a negative voltage
transients on integral circuits is –0.3 V over the whole
temperature range. Classical protection units have consisted
of diode/resistor networks as shown in Figures 2a and 2b.

The arrangement in Figure 2a does not, in general, meet
the specification and is therefore inadequate.

The problem with the solution shown if Figure 2b lies
mainly with the high current drain through the biassing
devices R1 and D3. A second problem exists if the input line
carries an analog signal. When Vin is close to the ground
potential, currents arising from leakage and mismatch
between D3 and D2 can be sourced into the input line, thus
disturbing the reading.

Figure 2. Classical Protection Circuits

(a) (b)

VinR

V

CC

D1

in

C

in

µ

D2

Gnd Gnd

VinR

C

R1

in

C

in

V

CC

D1

µ

C

D2

D

3

Figure 3 shows the clamping characteristics which
are common to each of the six cells in the Peripheral
Clamping Array.

As with the classical protection circuits, positive voltage
transients are clamped by means of a fast diode to the V

supply line.

CC

2

MOTOROLA ANALOG IC DEVICE DATA

Figure 3. Clamping Characteristics

I

IK

+10 mA

–0.3 V

Low

Impedance

0 V

–10 mA

High Low

Impedance Impedance

TCF6000

APPLICATIONS INFORMATION

Figure 4 depicts a typical application in a microcomputer
based automotive ignition system.

The TCF6000 is being used not only to protect the
system’s normal inputs but also the (bidirectional) serial
diagnostics port.

The value of the input resistors, Rin, is determined by the
clamping current and the anticipated value of the spikes.

V

CC

0.75 V Typ

VCC+

V

in

Thus:

V

where:

So, taking,

gives,

Rin =

= Peak Volts (V)

V

= Clamping current (A)

I

IK

= 300 V typically (SAE J1211)

V

= 10 mA (recommended)

I

IK

= 30 k

R

in

Ω

I

IK

Resistors of this value will not usually cause any problems
in MOS systems, but their presence needs to be taken into
account by the designer. Their ef fect will normally need to be
compensated for Bipolar systems.

V

bat

Gnd

V

bat

Pick Up

Temperature

Pressure

Gnd

Hall

Effect

Engine

Sensor

Battery

Volts

Figure 4. T ypical Automotive Application

V

CC

Gnd

R

Hall

6X

R

in

TCF6000

3X

C

in

Gnd

V

CC

INT1

D1

MC6805S2

D0

D2

V

SS

Gnd

Serial Diagnostics

B0

D6

B1

B2

Coil Drive

Coil Feedback

MOTOROLA ANALOG IC DEVICE DATA

Ignition ModuleCar

3

TCF6000

The use of Cin is not mandatory , and is not recommended
where the lines to be protected are used for output or for both
input and output. For digital input lines, the use of a small
capacitor in the range of 50 pF to 220 pF is recommended as
this will reduce the rate of rise of voltage seen by the
TCF6000 and hence the possibility of overshoot.

In the case of the analog inputs, such as that from the
pressure sensor, the capacitor Cin is necessary for devices
such as the MC6805S2 shown, which present a low
impedance during the sampling period. The maximum value
for Cin is determined by the accuracy required, the time taken
to sample the input and the input impedance during that time,
while the maximum value is determined by the required
frequency response and the value of R

Thus for a resistive input A/D connector where:

= Sample time (seconds)

T

s

= Device input resistance (Ω)

R

D

= Input voltage (V)

V

in

= Required accuracy (%)

k

= Charge on capacitor before sampling

Q

1

= Charge on capacitor after sampling

Q

2

= Device input current (A)

I

D

in.

kQ

Thus:

but,
and,

so that, ID Ts =

and, Cin (min) =

so, Cin (min) =

even simpler:

k
C

Cin (min) =
For the MC6805S2 this comes out at:
Cin (min) =

Q1–Q2 =

= Cin V

Q

1

= ID• T

Q1–Q

2

The calculation for a sample and hold type converter is

= Required accuracy (%)
= Hold capacitor (Farad)

H

100 • C

k

100.25 pF

0.25

1

100

in
s

k • Cin–V

ID• T
Vin• k

100 • T

k • R

H

in

100

s

Farad

s

Farad

D

Farad

= 10 nF for 1/4% accuracy

4

MOTOROLA ANALOG IC DEVICE DATA

NOTE 2

–T–

SEATING
PLANE

H

58

–B–

14

F

–A–

C

N

D

K

G

0.13 (0.005) B

M

T

TCF6000

OUTLINE DIMENSIONS

PLASTIC PACKAGE

CASE 626–05

ISSUE K

L

J

M

M

A

M

NOTES:

1. DIMENSION L TO CENTER OF LEAD WHEN
FORMED PARALLEL.

2. PACKAGE CONTOUR OPTIONAL (ROUND OR
SQUARE CORNERS).

3. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.

DIM MIN MAX MIN MAX

A 9.40 10.16 0.370 0.400
B 6.10 6.60 0.240 0.260
C 3.94 4.45 0.155 0.175
D 0.38 0.51 0.015 0.020
F 1.02 1.78 0.040 0.070

G 2.54 BSC 0.100 BSC

H 0.76 1.27 0.030 0.050
J 0.20 0.30 0.008 0.012
K 2.92 3.43 0.115 0.135
L 7.62 BSC 0.300 BSC

M ––– 10 ––– 10

N 0.76 1.01 0.030 0.040

INCHESMILLIMETERS

__

–T–

–A–

58

4X P

–B–

14

G

C

SEATING
PLANE

8X D

K

0.25 (0.010)MB

SS

A0.25 (0.010)MTB

D SUFFIX

PLASTIC PACKAGE

CASE 751–05

ISSUE N

M

R

X 45

_

M

(SO–8)

_

NOTES:

1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.

2. CONTROLLING DIMENSION: MILLIMETER.

3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.

4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.

5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.

DIM MIN MAX MIN MAX

A 4.80 5.00 0.189 0.196

F

J

B 3.80 4.00 0.150 0.157
C 1.35 1.75 0.054 0.068
D 0.35 0.49 0.014 0.019
F 0.40 1.25 0.016 0.049
G 1.27 BSC 0.050 BSC

J 0.18 0.25 0.007 0.009
K 0.10 0.25 0.004 0.009
M 0 7 0 7
P 5.80 6.20 0.229 0.244
R 0.25 0.50 0.010 0.019

INCHESMILLIMETERS

____

MOTOROLA ANALOG IC DEVICE DATA

5

TCF6000

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the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
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6

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MOTOROLA ANALOG IC DEVICE DATA

TCF6000/D

*TCF6000/D*