Datasheet MC145407 Specification

MC145407MOTOROLA

1

Advance Information

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EIA–232–E and CCITT V.28

The MC145407 is a silicon–gate CMOS IC that combines three drivers and
three receivers to fulfill the electrical specifications of EIA–232–E and CCITT
V.28 while operating from a single + 5 V power supply. A voltage doubler and
inverter convert the + 5 V to ± 10 V. This is accomplished through an on–board
20 kHz oscillator and four inexpensive external electrolytic capacitors. The
three drivers and three receivers of the MC145407 are virtually identical to
those of the MC145406. Therefore, for applications requiring more than three
drivers and/or three receivers, an M C145406 can be powered from an
MC145407, since the MC145407 charge pumps have been designed to
guarantee ± 5 V at the output of up to six drivers. Thus, the MC145407 provides
a high–performance, low–power, stand–alone solution or, with the MC145406,
a + 5 V only, high–performance two–chip solution.

Drivers

• ± 7.5 V Output Swing

• 300 Ω Power–Off Impedance

• Output Current Limiting

• TTL and CMOS Compatible Inputs

• Slew Rate Range Limited from 4 V/µs to 30 V/µs

Receivers

• + 25 V Input Range

• 3 to 7 kΩ Input Impedance

• 0.8 V Hysteresis for Enhanced Noise Immunity

Charge Pumps

• + 5 V to ± 10 V Dual Charge Pump Architecture

• Supply Outputs Capable of Driving Three On–Chip Drivers and Three

Drivers on the MC145406 Simultaneously

• Requires Four Inexpensive Electrolytic Capacitors

• On–Chip 20 kHz Oscillator

This document contains information on a new product. Specifications and information herein are subject to change without notice.

Order this document

by MC145407/D



SEMICONDUCTOR TECHNICAL DATA



P SUFFIX

PLASTIC DIP

CASE 738

ORDERING INFORMATION

MC145407P Plastic DIP
MC145407DW SOG Package

DW SUFFIX

SOG PACKAGE

CASE 751D

20

1

20

1

R

R

D

R

D

D

C2+

GND

C2–

V

SS

Rx1

Tx1

Rx2

Tx2

Rx3

Tx3

C1+

V

CC

C1–

V

DD

DO1

DI1

DO2

DI2

DO3

DI3

20

19

18

17

16

15

14

13

12

11

1

2

3

4

5

6

7

8

9

10

PIN ASSIGNMENT

D = DRIVER

R = RECEIVER

 Motorola, Inc. 1995

REV 1
10/95

MC145407 MOTOROLA
2

Tx

FUNCTION DIAGRAM

V

DD

V

CC

DI

1.4 V

V

SS

300

Ω

LEVEL

SHIFT

DRIVER

*

V

CC

OSC

VOLTAGE

DOUBLER

VOLTAGE

INVERTER

C3

V

DD

C1

C1 – C1 +

C2

C2 + C2 –

V

SS

GND

C4

+

+

+

+

V

CC

DO

1.0 V

1.8 V

V

SS

Rx

V

DD

5.4 k

15 k

Ω

V

DD

*Proctection circuit

RECEIVER

CHARGE PUMPS

+
–

+
–

MC145407MOTOROLA

3

MAXIMUM RATINGS (Voltage polarities referenced to GND)

Rating

Symbol Value Unit

DC Supply Voltages V

CC

– 0.5 to + 6.0 V

Input Voltage Range

Rx1 – Rx3 Inputs

DI1 – DI3 Inputs

V

IR

VSS – 15 to VDD+ 15

– 0.5 to (VCC+ 0.5)

V

DC Current per Pin I ± 100 mA
Power Dissipation P

D

1 W

Operating Temperature Range T

A

– 40 to + 85 °C

Storage Temperature Range T

stg

– 85 to + 150 °C

DC ELECTRICAL CHARACTERISTICS (All polarities referenced to GND = 0 V; C1, C2, C3, C4 = 10 µF; T

A

= – 40 to + 85°C)

Parameter

Symbol Min Typ Max Unit

DC Supply Voltage V

CC

4.5 5 5.5 V

Quiescent Supply Current
(Outputs unloaded, inputs low)

I

CC

— 1.2 3.0 mA

Output Voltage I

load

= 0 mA

I

load

= 5 mA

I

load

= 10 mA

V

DD

8.5

7.5
6

10

9.5
9

11
—
—

V

I

load

= 0 mA

I

load

= 5 mA

I

load

= 10 mA

V

SS

– 8.5
– 7.5

– 6

– 10
– 9.2
– 8.6

–11

—
—

RECEIVER ELECTRICAL SPECIFICATIONS

(Voltage polarities referenced to GND = 0 V; VCC = + 5 V ± 10%; C1, C2, C3, C4 = 10 µF; TA = – 40 to + 85°C)

Characteristic

Symbol Min Typ Max Unit

Input Turn–on Threshold Rx1 – Rx3

V

DO1 – DO3

= V

OL

V

on

1.35 1.8 2.35 V

Input Turn–off Threshold Rx1 – Rx3

V

DO1 – DO3

= V

OH

V

off

0.75 1.0 1.25 V

Input Threshold Hysteresis (Von – V

off

) Rx1 – Rx3 V

hys

0.6 0.8 — V

Input Resistance Rx1 – Rx3 R

in

3.0 5.4 7.0 kΩ

High–Level Output Voltage DO1 – DO3

V

Rx1 – Rx3

= – 3 V to – 25 V
IOH = – 20 µA
IOH = – 1 mA

V

OH

VCC – 0.1
VCC – 0.7

—

4.3

—
—

V

Low–Level Output Voltage DO1 – DO3

V

Rx1 – Rx3

= + 3 V to + 25 V
IOL = + 20 µA
IOL = + 1.6 mA

V

OL

—
—

0.01

0.5

0.1

0.7

V

This device contains protection circuitry to
protect the inputs against damage due to high
static voltages or electric fields; however, it is
advised that normal precautions be taken to
avoid application of any voltage higher than
maximum rated voltages to this high imped­ance circuit. For proper operation, it is recom­mended that the voltages at the DI and DO pins
be constrained to the range GND ≤ VDI ≤ V

CC

and GND ≤ VDO ≤ VCC. Also, the voltage at
the Rx pin should be constrained to (V

SS

– 15 V) ≤ V

Rx1 – Rx3

≤ (VDD + 15 V), and Tx

should be constrained to VSS ≤ V

Tx1 – Tx3

≤ VDD.

Unused inputs must always be tied to
appropriate logic voltage level (e.g., GND or
VCC for DI, and GND for Rx).

MC145407 MOTOROLA
4

DRIVER ELECTRICAL SPECIFICATIONS

(Voltage polarities referenced to GND = 0 V: VCC = +5 V ±10%; C1, C2, C3, C4 = 10 µF; TA = –40 to +85°C)

Characteristic

Symbol Min Typ Max Unit

Digital Input Voltage DI1 – DI3

Logic 0
Logic 1

V

IL

V

IH

—

2.0

—
—

0.8
—

V

Input Current DI1 – DI3

GND ≤ V

DI1 – DI3

≤ V

CC

I

in

— — ± 1.0 µA

Output High Voltage Tx1 – Tx3

V

DI1 – DI3

= Logic 0, RL = 3.0 kΩ Tx1 – Tx6*

V

OH

6
5

7.5

6.5

—
—

V

Output Low Voltage Tx1 – Tx3

V

DI1 – DI3

= Logic 1, RL = 3.0 kΩ Tx1 – Tx6*

V

OL

– 6
– 5

– 7.5
– 6.5

—
—

V

Off Source Impedance (Figure 1) Tx1 – Tx3 Z

off

300 — — Ω

Output Short–Circuit Current Tx1 – Tx3

VCC = + 5.5 V Tx1 – Tx3 shorted to GND**

Tx1 – Tx3 shorted to ± 15 V***

I

SC

—
—

—
—

± 60

± 100

mA

*Specifications for an MC145407 powering an MC145406 with three additional drivers/receivers.

**Specification is for one Tx output pin to be shorted at a time. Should all three driver outputs be shorted simultaneously, device power dissipation

limits could be exceeded.

***This condition could exceed package limitations.

SWITCHING CHARACTERISTICS (V

CC

= + 5 V ± 10%; C1, C2, C3, C4 = 10 µF; TA = – 40 to + 85°C; See Figures 2 and 3)

Characteristic

Symbol Min Typ Max Unit

Drivers

Propagation Delay Time Tx1 – Tx3

Low–to–High

RL = 3 kΩ, CL = 50 pF or 2500 pF

t

PLH

— 0.5 1

µs

High–to–Low

RL = 3 kΩ, CL = 50 pF or 2500 pF

t

PHL

— 0.5 1

Output Slew Rate Tx1 – Tx3

Minimum Load: RL = 7 kΩ, CL = 0 pF

SR

— 9.0 ± 30

V/µs

Maximum Load: RL = 3 kΩ, CL = 2500 pF 4.0 — —

Receivers (C

L

= 50 pF)

Propagation Delay Time DO1 – DO3

Low–to–High

t

PLH

— — 1

µs

High–to–Low t

PHL

— — 1

Output Rise Time DO1 – DO3 t

r

— 250 400 ns

Output Fall Time DO1 – DO3 t

f

— 40 100 ns

MC145407MOTOROLA

5

Vin = ± 2

V

6

8

10

15

13

11

4 2

17 19

VDDV

CC

DI1

DI2

DI3

V

SS

GND

Tx3

Tx2

Tx1

R

out

=

V

in

I

Figure 1. Power–Off Source Resistance

Figure 2. Switching Characteristics

Figure 3. Slew Rate Characterization

DRIVERS

DI1 – DI3

3 V

0 V

V

OH

V

OL

Tx1 – Tx3

t

PLH

t

PHL

50%

t

f

t

r

10%

90%

RECEIVERS

Rx1 – Rx3

DO1 – DO3

+ 3 V

0 V

V

OH

V

OL

t

PLH

t

PHL

t

f

t

r

50%

DRIVERS

Tx1 – Tx3

90%

50%

3 V

– 3 V

3 V

– 3 V

t

SHL

t

SLH

SLEW RATE (SR) =

–

3 V – (3 V)OR3 V – ( – 3 V)

t

SLH

t

SHL

10%

PIN DESCRIPTIONS

V

CC

Digital Power Supply (Pin 19)

The digital supply pin, which is connected to the logic pow­er supply. This pin should h ave a 0.33 µF capacitor to
ground.

GND
Ground (Pin 2)

Ground return p in is typically connected to t he signal
ground pin of the EIA–232–E connector (Pin 7) as well as to
the logic power supply ground.

V

DD

Positive Power Supply (Pin 17)

This is the positive output of the on–chip voltage doubler
and the positive power supply input of the driver/receiver
sections of the device. This pin requires an external storage
capacitor to filter the 50% duty cycle voltage generated by
the charge pump.

V

SS

Negative Power Supply (Pin 4)

This is the negative output of the on–chip voltage doubler/
inverter and the negative power supply input of the driver/re­ceiver sections of the device. This pin requires an external
storage capacitor to filter the 50% duty cycle voltage gener­ated by the charge pump.

C2+, C2–, C1–, C1+
Voltage Doubler and Inverter (Pins 1, 3, 18, 20)

These are the connections to the internal voltage doubler
and inverter, which generate the VDD and VSS voltages.

Rx1, Rx2, Rx3
Receive Data Input (Pins 5, 7, 9)

These are the EIA–232–E receive signal inputs. A voltage
between + 3 and + 25 V is decoded as a space and causes
the corresponding DO pin to swing to ground (0 V). A voltage
between – 3 and – 25 V is decoded as a mark, and causes
the DO pin to swing up to VCC.

DO1, DO2, DO3
Data Output (Pins 16, 14, 12)

These are the receiver digital output pins, which swing
from VCC to GND. Each output pin is capable of driving one
LSTTL input load.

DI1, DI2, DI3
Data Input (Pins 15, 13, 11)

These are the high impedance digital input pins to the driv­ers. Input voltage levels on these pins must be between V

CC

and GND.

Tx1, Tx2, Tx3
Transmit Data Output (Pins 6, 8, 10)

These are the EIA–232–E transmit signal output pins,
which swing toward VDD and V

SS.

A logic 1 at a DI input
causes the corresponding Tx output to swing toward VSS. A
logic 0 causes the output to swing toward VDD. The actual
levels and slew rate achieved will depend on the output load­ing (RLø

CL).

MC145407 MOTOROLA
6

APPLICATIONS INFORMATION

ESD CONSIDERATIONS

ESD protection on IC devices that have their pins acces­sible to the outside world is essential. High static voltages
applied to the pins when someone touches them either di­rectly or indirectly can cause damage to gate oxides and
transistor junctions by coupling a portion of the energy from
the I/O pin to the power supply busses of the IC. This cou­pling will usually occur through the internal ESD protection
diodes. The key to protecting the IC is to shunt as much of
the energy to ground as possible before it enters the IC. Fig­ure 7 shows a technique which will clamp the ESD voltage at
approximately + 15 V using the MMBZ15VDLT1. Any resid­ual voltage which appears on the supply pins is shunted to
ground through the 0.1 µF capacitors.

OPERATION WITH SMALLER VALUE CHARGE PUMP
CAPS

The MC145407 is characterized in the e lectrical tables

using 10 µF charge pump caps to illustrate its capability in
driving a companion MC145406 or MC145403. If there is no
requirement to support a second interface device and/or the
charge pump is not being used to power any other com­ponents, t he MC145407 is c apable o f complying w ith
EIA–232–E and V.28 with smaller value charge pump caps.
Table 1 summarizes driver performance with both 2.2 µF and

1.0 µF charge pump caps.

Table 1. Typical Performance

Parameter 2.2 µF 1.0 µF

Tx VOH @ 25°C 7.3 7.2
Tx VOH @ 85°C 7.2 7.1
Tx VOL @ 25°C – 6.5 – 6.4
Tx VOL @ 85°C – 6.1 – 6.0
Tx Slew Rate @ 25°C 8.0 V/µs 8.0 V/µs
Tx Slew Rate @ 85°C 7.0 V/µs 7.0 V/µs

14

600

16

TIP

13

BYPASS

DTMF

INPUT

R

DSI

20 k

Ω

C

DSI

RTLA

+ 5 V

20

6

9

8
3

11

5

TLA

DSI

TxA
RxA2

1

17
15

V

DD

X

in

X

out
CD

TxD
RxD

SQT

LB

MODE

CDA

V

SS

CDT

V

AG

FB

ExI

RxA1

R

Tx

18
10
19

4

600:600

C

FB

+

10 k

Ω

RING

V

DD

V

DD

BYPASS

V

SS

C

CDT

12

7

2

10 k

Ω

10 k

Ω

10 k

Ω

0.1 µF

0.1

µ

F

0.1

µ

F

0.1

µ

F

0.1

µ

F

0.1

µ

F

10

µ

F

1.0

µ

F

3.579
MHz

C

CDA

3

1

15

16
13

17 19

6

5

8

7

9

8

2

3

7

24

V

SS

GND

DI3

DI2

DO1

DI1

C2 +

C2 –

V

DD

V

CC

C1 –

C1 +

Tx1

Rx1

Tx2

Rx2

Rx3

*Line protection circuit

MC145442

OR

MC145443

MC145407

1.0

µ

F

1.0 µF

1.0

µ

F

+

EIA–232–E

DB–25

CONNECTOR

0.1 µF

0.1 µF

0.1 µF

*

Figure 4. 5 V, 300 Baud Modem with EIA–232–E Interface

MC145407MOTOROLA

7

1

V

DD

V

CC

C1+

20

C2+

1

10 µF

MC145407

MC145406

2
3
4

5
6
7
8 9

10

11

12

13

14

15

16

2
3

4
5
6
7
8

11

12

13

14

15

16

9

10

17

18

19

Rx1
Tx1
Rx2

Tx2
Rx3
Tx3
V

SS

DO1

DI1

DO2

DI2

DO3

DI3

GND

GND
C2–
V

SS
Rx1
Tx1
Rx2
Tx2
Rx3

Tx3 DI3

DO3

DI2

DO2

DI1

DO1

V

DD

C1–

V

CC

+ 5 V

10

µ

F

10

µ

F

10

µ

F

Figure 5. MC145406/MC145407 5 V Only Solution for up to Six EIA–232–E Drivers and Receivers

C1+

C1–

V

CC

0.1 µF

1 20
2 19
3 18
4 17
5 16
6 15
7 14
8 13
9 12
10 11

C4

C2

C2+

GND

C2–

V

SS

V

DD

0.1 µF

+10 V

+5 V

Figure 6. Two Supply Configuration (MC145407 Generates VSS Only)

C1+

C1–

DO1
DI1
DO2
DI2
DO3
DI3

V

CC

0.1 µF

1 20
2 19
3 18
4 17
5 16
6 15
7 14
8 13

TO

CONNECTOR

MMBZ15VDLT

×

6

9 12
10 11

C4

C2

C2+

GND

C2–

Rx1
Tx1
Rx2
Tx2
Rx3
Tx3

V

SS

V

DD

0.1 µF

C3

C1

+5 V

Figure 7. ESD Protection Scheme

MC145407 MOTOROLA
8

PACKAGE DIMENSIONS

P SUFFIX
PLASTIC DIP
CASE 738–03

1.070

0.260

0.180

0.022

0.070

0.015

0.140
15

°

0.040

1.010

0.240

0.150

0.015

0.050

0.008

0.110
0

°

0.020

25.66

6.10

3.81

0.39

1.27

0.21

2.80
0

°

0.51

27.17

6.60

4.57

0.55

1.77

0.38

3.55
15

°

1.01

0.050 BSC

0.100 BSC

0.300 BSC

1.27 BSC

2.54 BSC

7.62 BSC

MIN MINMAX MAX

INCHES MILLIMETERS

DIM

A
B
C
D
E
F
G
J
K
L
M
N

NOTES:

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

2. CONTROLLING DIMENSION: INCH.

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

4. DIMENSION B DOES NOT INCLUDE MOLD
FLASH.

-A-

C

K

N

E

G F

D

20 PL

J 20 PL

L

M

-T-

SEATING
PLANE

1 10

1120

0.25 (0.010) T A

M M

0.25 (0.010) T B

M M

B

DW SUFFIX

SOG PACKAGE

CASE 751D–04

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 0.150
(0.006) PER SIDE.

5. DIMENSION D DOES NOT INCLUDE
DAMBAR PROTRUSION. ALLOWABLE
DAMBAR PROTRUSION SHALL BE 0.13
(0.005) TOTAL IN EXCESS OF D DIMENSION
AT MAXIMUM MATERIAL CONDITION.

–A–

–B–

20

1

11

10

S

A

M

0.010 (0.25) B

S

T

D20X

M

B

M

0.010 (0.25)

P10X

J

F

G

18X

K

C

–T–

SEATING
PLANE

M

R

X 45

_

DIM MIN MAX MIN MAX

INCHESMILLIMETERS

A 12.65 12.95 0.499 0.510
B 7.40 7.60 0.292 0.299
C 2.35 2.65 0.093 0.104
D 0.35 0.49 0.014 0.019
F 0.50 0.90 0.020 0.035
G 1.27 BSC 0.050 BSC
J 0.25 0.32 0.010 0.012
K 0.10 0.25 0.004 0.009
M 0 7 0 7
P 10.05 10.55 0.395 0.415
R 0.25 0.75 0.010 0.029

_ _

_ _

Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding
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 specifically disclaims any and all liability, including without limitation consequential or incidental damages. “T ypical” parameters can and do vary in different
applications. All operating parameters, including “T ypicals” must be validated for each customer application by customer’s technical experts. Motorola does
not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in
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against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part.
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MC145407/D

*MC145407/D*

◊