Philips PCF1174C Technical data

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DATA SH EET

PCF1174C

4-digit static LCD car clock

Product specification
Supersedes data of September 1993
File under Integrated Circuits, IC16

1997 Apr 16

Philips Semiconductors Product specification

4-digit static LCD car clock PCF1174C

FEATURES

• Internal voltage regulator is electrically programmable
for various LCD voltages

• Time calibration is electrically programmable
(no trimming capacitor required)

• LCD voltage adjusts with temperature for good contrast

• 4.19 MHz oscillator

• 12-hour or 24-hour mode

• Operating ambient temperature: −40 to +85 °C

• 40-lead plastic SMD, face down (VSO40).

ORDERING INFORMATION

TYPE

NUMBER

PCF1174CT VSO40 plastic very small outline package; 40 leads; face down
PCF1174CU − uncased chip in tray

Notes

1. See Fig.1 and Chapter “Package outline” for pin layout and package details.

2. See Chapter “Chip dimensions and bonding pad locations” for pad layout and package details.

NAME DESCRIPTION VERSION

(2)

GENERAL DESCRIPTION

The PCF1174C is a single chip, 4.19 MHz CMOS car clock
circuit providing hours, minutes and seconds functions.
It is designed to drive a 4-digit static liquid crystal display
(LCD).

Two external single-pole, single-throw switches will
accomplish all time setting functions. Time calibration and
voltage regulator are electrically programmable via an
on-chip EEPROM. The circuit is battery-operated via an
internal voltage regulator and an external resistor.

PACKAGE

(1)

SOT158-2

−

1997 Apr 16 2

Philips Semiconductors Product specification

4-digit static LCD car clock PCF1174C

PINNING

SYMBOL PIN DESCRIPTION

BP 1 backplane output
PM 2 segment driver
AM 3 segment driver
ADEG1 4 segment driver
C1 5 segment driver
E2 6 segment driver
D2 7 segment driver
C2 8 segment driver
E3 9 segment driver
C3 10 segment driver
E4 11 segment driver
D4 12 segment driver
C4 13 segment driver
B4 14 segment driver
S1 15 hour adjustment input
DATA 16 EEPROM data input
OSC IN 17 oscillator input
OSC OUT 18 oscillator output
V

SS

19 negative supply
MODE 20 12/24-hour mode select input
V

PP

21 programming voltage input
TS 22 test speed-up mode input
ENABLE 23 set enable input for S1 and S2
V

DD

24 positive supply voltage
FLASH 25 colon option input
SEL 26 EEPROM select input
S2 27 minute adjustment input
A4 28 segment driver
F4 29 segment driver
G4 30 segment driver
B3 31 segment driver
AD3 32 segment driver
F3 33 segment driver
G3 34 segment driver
COL 35 segment driver
B2 36 segment driver
A2 37 segment driver
F2 38 segment driver
G2 39 segment driver
B1 40 segment driver

ADEG1

OSC IN

OSC OUT

Fig.1 Pin configuration, PCF1174CT, (VSO40).

BP
PM
AM

C1

E2
D2
C2

E3
C3

E4
D4
C4

B4

S1

DATA

V

SS

MODE

1
2
3
4
5
6
7
8
9

10

PCF1174CT

11
12

13

15
16
17
18
19
20

MSA991

40
39
38
37
36
35
34
33
32
31
30
29
28
2714
26
25
24
23
22
21

B1
G2
F2
A2
B2
COL
G3
F3
AD3
B3
G4
F4
A4
S2
SEL
FLASH

V

DD

ENABLE

TS
V

PP

1997 Apr 16 3

Philips Semiconductors Product specification

4-digit static LCD car clock PCF1174C

FUNCTIONAL DESCRIPTION AND TESTING
Outputs

The circuit outputs static data to the LCD. Generation of
BP and the output signals are shown in Fig.4.

F2

E2

A2

G2

AM

E1

A1

G1

B1

C1

PM

D1

Fig.2 Segment designation of LCD.

D2

The average voltages across the segments are:

1. V

ON(RMS)=VDD

B2

C2

2. V

P1 (P3)

P2 (P4)

OFF(RMS)

F3

E3

=0V.

A3

G3

D3

B3

C3

F4

E4

A4

G4

D4

MSA992

B4

C4

TIME

TIME

PM

(a)

a. 12-hour mode.

(b)

b. 24-hour mode.

Fig.3 Typical displays.

MSA994

MSA993

V

DD

BP

0

SEGMENT

V

ON

DD

0

V

DD

0

15.625 ms

OFF

Fig.4 Backplane and output signals.

MSA996

1997 Apr 16 4

Philips Semiconductors Product specification

4-digit static LCD car clock PCF1174C

LCD voltage (see Fig.5)
The adjustable voltage regulator controls the supply

voltage (see Section “LCD voltage programming”) in
relation to temperature for good contrast, for example
when VDD= 4.5 V at +25 °C, then:

VDD= 3 to 4 V at +85 °C.
VDD= 5 to 6 V at −40 °C.

−8

V

SS

(V)

−6

−4

−2

0

40 0 40 120

(1) Programmed to 4.0 V at 25 °C (value within the specified operating range).
(2) Programmed to 4.5 V at 25 °C (value within the specified operating range).
(3) Programmed to 5.0 V at 25 °C (value within the specified operating range).

(3)

(2)
(1)

Fig.5 Regulated voltage as a function of temperature (typical).

80

MSA995

o

T ( C)

1997 Apr 16 5

Philips Semiconductors Product specification

4-digit static LCD car clock PCF1174C

12/24-hour mode

Operation in 12-hour or 24-hour mode is selected by
connecting MODE to VDDor VSS respectively.

Power-on

After connecting the supply, the start-up mode is:
1:00 AM; 12-hour mode.
0:00; 24-hour mode.

Colon

If FLASH is connected to V

the colon pulses at 1 Hz.

DD

If FLASH is connected to VSS the colon is static.

Time setting

Switch inputs S1 and S2 have a pull-up resistor to facilitate
the use of single-pole, single-throw contacts. A debounce
circuit is incorporated to protect against contact bounce
and parasitic voltages.

Set enable

Inputs S1 and S2 are enabled by connecting ENABLE to

or disabled by connecting to VSS.

V

DD

Set hours

When S1 is connected to V

the hours displayed

SS

advances by one and after one second continues with one
advance per second until S1 is released (auto-increment).

Set minutes

Segment test/reset

When S1 and S2 are connected to V

, all LCD segments

SS

are switched ON. Releasing switches S1 and S2 resets the
display. No reset occurs when DATA is connected to V

SS

(overlapping S1 and S2).

Test mode

When TS is connected to V

, the device is in normal

DD

operating mode. When connecting TS to VSS all counters
(seconds, minutes and hours) are stopped, allowing quick
testing of the display via S1 and S2 (debounce and
auto-increment times are 64 times faster). TS has a
pull-up resistor but for reasons of safety it should be
connected to VDD.

EEPROM

V

has a pull-up resistor but for reasons of safety it should

PP

be connected to VDD.

LCD voltage programming

To enable LCD voltage programming, SEL is set to
open-circuit and a level of V

− 5 V is applied to V

DD

PP

(see Fig.6). The first pulse (tE) applied to the DATA input
clears the EEPROM to give the lowest voltage output.
Further pulses (tL) will increment the output voltage by
steps of typically 150 mV (T

amb

=25°C).
For programming, measure VDD− VSS and apply a store
pulse (tW) when the required value is reached. If the
maximum number of steps (n = 31) is reached and an
additional pulse is applied the voltage will return to the
lowest value.

When S2 is connected to V

the time displayed in

SS

minutes advances by one and after one second continues
with one advance per second until S2 is released
(auto-increment). In addition to minute correction, the
seconds counter is reset to zero.

1997 Apr 16 6

Time calibration

To compensate for the tolerance in the quartz crystal
frequency which has been positively offset (nominal
deviation +60 × 10

−6

) by capacitors at the oscillator input
and output, a number (n) of 262144 Hz pulses are
inhibited every second of operation.

Philips Semiconductors Product specification

4-digit static LCD car clock PCF1174C

The number (n) is stored in a non-volatile memory which is achieved by the following steps (see Fig.6):

1. Set SEL to VSS and a level of VDD− 5 V to V

2. The quartz-frequency deviation ∆f/f is measured and (n) is calculated (see Table 1)

3. A first pulse tE is applied to the DATA input clears the EEPROM to give the highest backplane frequency

4. The calculated pulses (n) are entered in (tH, tL). If the maximum backplane period is reached and an additional pulse
is applied the period will return to the lowest value.

5. The backplane period is controlled and (when correct) fixed by applying the store pulse t

6. Release SEL and VPP.

PP

W

Table 1 Time calibration (∆t = 3.81 µs; SEL at V

OSCILLATOR-FREQUENCY DEVIATION

∆f/f

−6

(× 10

)

0 0 15.625
+3.8 1 15.629
+7.6 2 15.633

+11.4 3 15.636

...
...
...

+117.8 31 15.743

)

SS

NUMBER OF PULSES

(n)

BACKPLANE PERIOD

(ms)

1997 Apr 16 7

Philips Semiconductors Product specification

4-digit static LCD car clock PCF1174C

V

PP

DATA

DD

DD

V

DD
5 VV

50 µs

V

DD
5 VV

50 µs

clears cells incrementing counters store pulse

t , t = 4 to 6 ms

WE

t = 1 µs

H

t = 1 to 1.5 µs

L

0 V

pulse
generators

MSA997

t

E

tHtLtHt

n

V

PP

DATA

V

PCF1174C

SS

L

t

H

SEL

V

DD

OSC OUT

OSC IN

V

SS

C 47 µF

ext

R

6.8 kΩ

50 µs

50 µs

t

W

12 V

Fig.6 Programming diagram.

1997 Apr 16 8

Philips Semiconductors Product specification

4-digit static LCD car clock PCF1174C

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

DD

I

DD

V

I

T

amb

T

stg

Note

1. Connecting the supply voltage with reverse polarity, will not harm the circuit, provided the current is limited to 10 mA
by the external resistor.

HANDLING

supply voltage with respect to V

SS

− 8V
supply current VSS= 0 V; note 1 − 3mA
input voltage all pins except VPP and DATA −0.3 VDD+ 0.3 V

pins V

and DATA −3V

PP

+ 0.3 V

DD

operating ambient temperature −40 +85 °C
storage temperature −55 +125 °C

Inputs and outputs are protected against electrostatic discharges in normal handling. However, to be totally safe, it is
advisable to take handling precautions appropriate to handling MOS devices. Advice can be found in

“Data Handbook IC16, General, Handling MOS Devices”

.

1997 Apr 16 9

Philips Semiconductors Product specification

4-digit static LCD car clock PCF1174C

CHARACTERISTICS

V

=3to6V; VSS=0V; T

DD

frequency tolerance = ±30 × 10

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply

V

DD

∆V

DD

supply voltage voltage regulator programmed

supply voltage variation S1 or S2 closed −− 50 mV

TC supply voltage variation due

to temperature

I

DD

C

EXT

supply current note 1 700 950 −µA
capacitance external capacitor 47 −−µF

Oscillator

t

osc

start time −− 200 ms

∆f/f frequency deviation nominal n = 0 0 60 × 10
∆f/f frequency stability ∆VDD= 100 mV −− 1×10

R

fb

C

i

C

o

feedback resistance 300 1000 3000 kΩ
input capacitance − 16 − pF
output capacitance − 27 − pF

Inputs

R

O

I

IL

t

d

programming voltage

V

PP

I

O2

pull-up resistance S1, S2, TS, SEL and DATA 45 90 180 kΩ
leakage current FLASH, ENABLE, MODE −− 2 µA
debounce time S1 and S2 only 30 65 100 ms

output current VPP=VDD− 5V 70 − 700 µA

= −40 to +85 °C; crystal: f = 4.194304 MHz; Rs=50Ω; CL= 12 pF; maximum

amb

−6

; unless otherwise specified.

3 − 6V

to 4.5 V at T

amb

=25°C

−−0.35 − %/K

= 4.5 V −−16 − mV/K

V

DD

−6

110 × 10

during programming − 500 −µA

−6

−6

Backplane (high and low levels)

R

BP

output resistance ±100 µA −− 3kΩ

Segment

R

SEG

output resistance ±100 µA −− 5kΩ

LCD

V

offset(DC)

DC offset voltage 200 kΩ/1 nF −− 50 mV

Note

1. A suitable resistor (R) must be selected (example):
a) V

= 5 V; R max. (12 V − 5 V)/700 µA=10kΩ.

DD

b) VDD= 5 V; R typ. (12 V − 5 V)/900 µA = 7.8 kΩ (more reserve).
c) IDD must not exceed 3 mA.

1997 Apr 16 10

Philips Semiconductors Product specification

4-digit static LCD car clock PCF1174C

CHIP DIMENSIONS AND BONDING PAD LOCATIONS

y

AM

PM

ADEG1

BPB1G2

F2

A2

3.02 mm

Chip area: 6.4 mm2.
Bonding pad dimensions: 110 µm × 110 µm.
Chip thickness: 381 ±25 mm.

C1
E2
D2
C2
E3
C3
E4
D4

C4
B4
S1

DATA

0

0

OSC IN

PCF1174CU

SS

V

OSC OUT

2.12 mm

MODE

B2
COL
G3
F3
AD3
B3
G4
F4
A4
S2

SEL
FLASH

x

PP

TS

V

DD

V

ENABLE

MSA998

Fig.7 Bonding pad locations, PCF1174CU; 40 terminals.

1997 Apr 16 11

Philips Semiconductors Product specification

4-digit static LCD car clock PCF1174C

Table 2 Bonding pad locations (dimensions in µm)
All x/y coordinates are referenced to the bottom left pad (OSC IN), see Fig.7.

PAD x y PAD x y

BP 600 2676 V

PP

PM 400 2676 TS 1000 0
AM 200 2676 ENABLE 1200 0
ADEG1 0 2676 V

DD

C1 −138 2448 FLASH 1538 168
E2 −138 2228 SEL 1538 388
D2 −138 2008 S2 1538 608
C2 −138 1808 A4 1538 808
E3 −138 1608 F4 1538 1008
C3 −138 1408 G4 1538 1208
E4 −138 1208 B3 1538 1408
D4 −138 1008 AD3 1538 1608
C4 −138 808 F3 1538 1808
B4 −138 608 G3 1538 2008
S1 −138 388 COL 1538 2208
DATA −138 168 B2 1538 2448
OSC IN 0 0 A2 1400 2676
OSC OUT 200 0 F2 1200 2676
V

SS

400 0 G2 1000 2676
MODE 600 0 B1 800 2676
chip corner (max. value) −360 −170

800 0

1400 0

1997 Apr 16 12

Philips Semiconductors Product specification

4-digit static LCD car clock PCF1174C

APPLICATION INFORMATION

BP 1

OSC IN

OSC OUT1718

SEL

DATA

S1
S2

MODE

V

SS

26
16

15
27
20

19

AM/PM

COUNTER

OSCILLATOR

DECODER

DECODER

HOURS

COUNTER

REGULATOR

EEPROM

CONTROL

LOGIC

VOLTAGE

MINUTES

COUNTER

ADJUSTABLE

DIVIDER

PCF1174C

SECONDS
COUNTER

2 - 14

28 - 40

21

25 FLASH
22 TS
23

MSA999

segment drivers

V

PP

ENABLE

V

DD

(1)

100 nF

to LCD

12 V

C

ext

6.8 kΩ

I

DD

47 µF

(1) To be placed close to the IC.

Fig.8 Typical application diagram.

1997 Apr 16 13

Philips Semiconductors Product specification

4-digit static LCD car clock PCF1174C

PACKAGE OUTLINE

VSO40: plastic very small outline package; 40 leads; face down

D

y

c

Z

40 21

SOT158-2

E

H

E

L

L

p

Q

A

1

A

2

(A )

A

X

v M

A

θ

3

A

pin 1 index

201

w M

b

e

0 5 10 mm

DIMENSIONS (inch dimensions are derived from the original mm dimensions)

mm

OUTLINE
VERSION

SOT158-2

A

max.

2.70

0.11

0.3

0.1

0.012

0.004

b

3

p

2.45

2.25

0.096

0.089

IEC JEDEC EIAJ

0.25

0.010

0.42

0.30

0.017

0.012

0.22

0.14

0.0087

0.0055

UNIT A1A2A

inches

Note

1. Plastic or metal protrusions of 0.4 mm maximum per side are not included.

2. Plastic interlead protrusions of 0.25 mm maximum per side are not included.

(1)E(2)

cD

15.6

15.2

0.61

0.60

REFERENCES

p

scale

eHELLpQywv θ

7.6

0.762

7.5

0.30

0.03

0.29

12.3

11.8

0.48

0.46

2.25

0.089

1.7

1.5

0.067

0.059

detail X

1.15

0.2

1.05

0.045

0.008 0.004

0.041

EUROPEAN

PROJECTION

0.1 0.1

0.004

(1)

Z

0.6

0.3

0.024

0.012

ISSUE DATE

92-11-17
95-01-24

o

7

o

0

1997 Apr 16 14

Philips Semiconductors Product specification

4-digit static LCD car clock PCF1174C

SOLDERING
Introduction

There is no soldering method that is ideal for all IC
packages. Wave soldering is often preferred when
through-hole and surface mounted components are mixed
on one printed-circuit board. However, wave soldering is
not always suitable for surface mounted ICs, or for
printed-circuits with high population densities. In these
situations reflow soldering is often used.

This text gives a very brief insight to a complex technology.
A more in-depth account of soldering ICs can be found in
our

“IC Package Databook”

Reflow soldering

Reflow soldering techniques are suitable for all VSO
packages.

Reflow soldering requires solder paste (a suspension of
fine solder particles, flux and binding agent) to be applied
to the printed-circuit board by screen printing, stencilling or
pressure-syringe dispensing before package placement.

Several techniques exist for reflowing; for example,
thermal conduction by heated belt. Dwell times vary
between 50 and 300 seconds depending on heating
method. Typical reflow temperatures range from
215 to 250 °C.

Preheating is necessary to dry the paste and evaporate
the binding agent. Preheating duration: 45 minutes at
45 °C.

(order code 9398 652 90011).

Wave soldering

Wave soldering techniques can be used for all VSO
packages if the following conditions are observed:

• A double-wave (a turbulent wave with high upward
pressure followed by a smooth laminar wave) soldering
technique should be used.

• The longitudinal axis of the package footprint must be
parallel to the solder flow.

• The package footprint must incorporate solder thieves at
the downstream end.

During placement and before soldering, the package must
be fixed with a droplet of adhesive. The adhesive can be
applied by screen printing, pin transfer or syringe
dispensing. The package can be soldered after the
adhesive is cured.

Maximum permissible solder temperature is 260 °C, and
maximum duration of package immersion in solder is
10 seconds, if cooled to less than 150 °C within
6 seconds. Typical dwell time is 4 seconds at 250 °C.

A mildly-activated flux will eliminate the need for removal
of corrosive residues in most applications.

Repairing soldered joints

Fix the component by first soldering two diagonally­opposite end leads. Use only a low voltage soldering iron
(less than 24 V) applied to the flat part of the lead. Contact
time must be limited to 10 seconds at up to 300 °C. When
using a dedicated tool, all other leads can be soldered in
one operation within 2 to 5 seconds between
270 and 320 °C.

1997 Apr 16 15

Philips Semiconductors Product specification

4-digit static LCD car clock PCF1174C

DEFINITIONS

Data sheet status

Objective specification This data sheet contains target or goal specifications for product development.
Preliminary specification This data sheet contains preliminary data; supplementary data may be published later.
Product specification This data sheet contains final product specifications.

Limiting values

Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or
more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation
of the device at these or at any other conditions above those given in the Characteristics sections of the specification
is not implied. Exposure to limiting values for extended periods may affect device reliability.

Application information

Where application information is given, it is advisory and does not form part of the specification.

LIFE SUPPORT APPLICATIONS

These products are not designed for use in life support appliances, devices, or systems where malfunction of these
products can reasonably be expected to result in personal injury. Philips customers using or selling these products for
use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such
improper use or sale.

1997 Apr 16 16

Philips Semiconductors Product specification

4-digit static LCD car clock PCF1174C

NOTES

1997 Apr 16 17

Philips Semiconductors Product specification

4-digit static LCD car clock PCF1174C

NOTES

1997 Apr 16 18

Philips Semiconductors Product specification

4-digit static LCD car clock PCF1174C

NOTES

1997 Apr 16 19

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Sweden: Kottbygatan 7, Akalla, S-16485 STOCKHOLM,
Tel. [phone], Fax. [phone]

Switzerland: Allmendstrasse 140, CH-8027 ZÜRICH,
Tel. [phone], Fax. [phone]

Taiwan: Philips Semiconductors, 6F, No. 96, Chien Kuo N. Rd., Sec. 1,
TAIPEI, Taiwan Tel. [phone], Fax. [phone]

Thailand: PHILIPS ELECTRONICS (THAILAND) Ltd.,
209/2 Sanpavuth-Bangna Road Prakanong, BANGKOK 10260,
Tel. [phone], Fax. [phone]

Turkey: Talatpasa Cad. No. 5, 80640 GÜLTEPE/ISTANBUL,
Tel. [phone], Fax. [phone]

Ukraine: PHILIPS UKRAINE, 4 Patrice Lumumba str., Building B, Floor 7,
252042 KIEV, Tel. [phone], Fax. [phone]

United Kingdom: Philips Semiconductors Ltd., 276 Bath Road, Hayes,
MIDDLESEX UB3 5BX, Tel. [phone], Fax. [phone]

United States: 811 East Arques Avenue, SUNNYVALE, CA 94088-3409,
Tel. [phone]

Uruguay: see South America
Vietnam: see Singapore
Yugoslavia: PHILIPS, Trg N. Pasica 5/v, 11000 BEOGRAD,

Tel. [phone], Fax.[phone]

For all other countries apply to: Philips Semiconductors, Marketing & Sales Communications,
Building BE-p, P.O. Box 218, 5600 MD EINDHOVEN, The Netherlands, Fax. [phone]

© Philips Electronics N.V. 1997 SCA54
All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner.

The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed
without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license
under patent- or other industrial or intellectual property rights.

Internet: http://www.semiconductors.philips.com

Printed in The Netherlands 417087/1200/02/pp20 Date of release: 1997 Apr 16 Document order number: 9397 750 01528