− 8 + 1 − 8 +
CF5741 series
NIPPON PRECISION CIRCUITS INC.
OVERVIEW
The CF5741 series are analog clock driver ICs
using 32.768kHz reference frequency of crystal
oscillator. Some versions in accordance with the
combinations of each motor drive and alarm output
characteristics can provide a wide range of applications for various clock specifications.
FEATURES
■
Operating voltage 1.2 to 2.0V
■
Low current 1.2 µ A (typ) / 1.5V
■
Built-in oscillator circuits (32.768 kHz)
■
Built-in crystal oscillator capacitors (C
■
Motor output
Various motor output
■
Alarm output
Various alarm output
■
Reset function
■
Input debounce function (AI, RST/TC)
■
Chip form (CF5741 ×× )
, C
)
G
D
PINOUT
(T op V iew)
VSS
AO1
AO2/F
Y
XTN
Analog Clock CMOS IC
SA5741
1
2
3
4
XT
5
(0,0)
Chip size : 1.22 × 1.20 mm
Chip thickness : 400 ± 30 µ m
Pad size : 100 × 100 µ m
Reverse side : V
DD
10
9
8
7
6
X
level
OUT2
OUT1
AI
RST/TC
VDD
SERIES LINEUP
Built-in capacitor
Reset input Active level
Motor output
Alarm input
Alarm output
1. AO is complete reverse phase of AO. (even output is inactive.)
XT terminal C
XTN terminal C
Active level High High High High
Hand drive cycle t
Pulse width t
Active level
Test function (1/2V
Terminal AO1 AO2/F AO1 AO2/F AO1 AO2/F
Active level High High High High High Low High Low
Fundamental frequency f
Modulation frequency f
(pF) 0 25 0 27
G
(pF) 25 25 25 25
D
(sec) 1111
CY
(msec) 31.25 31.25 46.875 46.875
PW
) Yes Yes Yes Yes
DD
(Hz) 2048 32 2048 32 2048 2048 2048 2048
PW
(Hz) 8 + 1
CY
ORDERING INFORMATION
Device Package
CF5741 ××
Chip form
CF5741AA CF5741AB CF5741BA CF5741BB
Low
(Pull-up resistor)
Low
(Pull-up resistor)
Low
(Pull-up resistor)
Low
(Pull-up resistor)
Low
(Pull-up resistor)
Low
(Pull-up resistor)
1
18 + 18 + 18 + 1
Low
(Pull-up resistor)
Low
(Pull-up resistor)
AO1 AO2/F
1
NIPPON PRECISION CIRCUITS—1
BLOCK DIAGRAM
CF5741 series
XT
XTN
RST/TC
AI
CG
CD
Reset
Input
Alarm
Input
Alarm
Test
VDD
4 Stage
Divider
AO
Test
VSS
13 Stage
Divider
Alarm Output
Control
AO1 AO2/F OUT1 OUT2
Motor Output
Control
PIN DESCRIPTION
Number Name Description
1 VSS Ground 147 1048
2 AO1 Alarm signal output1 147 867
3 AO2 / F Alarm signal output2/Frequency output 147 685
4 XTN Crystal oscillator connection 146 446
5 XT Crystal oscillator connection 146 206
6 VDD Power supply pin 1072 147
7 RST / TC Reset/Test clock input 1073 386
8 AI Alarm input 1073 626
9 OUT1 Motor drive output 1 1072 867
10 OUT2 Motor drive output 2 1072 1048
Dimensions ( µ m)
XY
NIPPON PRECISION CIRCUITS—2
SPECIFICATIONS
Absolute Maximum Ratings
Parameter Symbol Condition Rating Unit
Supply voltage V
Input voltage V
Operating temperature T
Storage temperature T
Electrical Characteristics
DD
IN
OPR
STG
=
=
≤
−
−
≤
≤
−
°
−
° C
µ
=
=
=
=
=
∆
=
=
µ
=
µ
=
µ
=
µ
=
=
CF5741 series
V
SS
0.3 to 5.0 V
V
V
SS
V
IN
DD
30 to 80
65 to 150
V
C
Ta = 25 ° C, V
DD
1.5V, V
0V, X ′ tal (fo = 32.768kHz, C
SS
Parameter Symbol Condition
Supply voltage V
Current consumption I
Oscillator start-up time t
Motor output current I
Input resistance
2
(AI, RST/TC)
Oscillator stability
Alarm output current
(AO1, AO2/F)
Frequency output voltage V
Internal capacitance
1. R
is resistor of motor coil, that connect OUT1 between OUT2.
L
2. R
V
IN
DD
3. C
is internal capacitor between VDD and XT. C
G
3
/I
. I
is current that flow into VSS from AI, RST/TC, when AI, RST/TC short VSS. (AI,RST/TC build-in pull-up resistor.)
IS
IS
DD
DD
STA
MOT
R
IN
f/f V
I
OL1
I
OL2
I
OH1
I
OH2
F
C
G
C
D
D
35k Ω ), unless otherwise noted.
I
Rating
min typ max
1.2 1.5 2.0 V
OUT1, OUT2 = Open 1.2 4.0
V
1.2V 5.0 sec
DD
V
1.5V 2.0 sec
DD
V
1.2V, R
DD
L
200 Ω
1
4.0 mA
200 1200 k Ω
1.2V to 2.0V 0.5 1.0 ppm / 0.1V
DD
V
0.75V 900
OL
V
0.75V 10
OL
V
0.75V 900
OH
V
0.75V 10
OH
V
DD
1.2V, C
50pF 0.4 V
L
is internal capacitor between VDD and XTN.
Unit
A
A
A
A
A
pF
pF
NIPPON PRECISION CIRCUITS—3
FUNCTIONAL DESCRIPTION
Motor Output
Stepping motor drive type
t
PW
OUT1
(Active High)
OUT2
(Active High)
t
1sec
CY
CF5741 series
<
≤
>
t
PW
t
CY
1sec
t
CY
: Needle period
t
PW
: Pulse width
Sweeping motor drive type
OUT1
tCY
125msec
OUT2
tCY : Needle period
tPW : Pulse width
tCY
125msec
Input Debounce Function (AI ,RST/TC)
Setting bouncing delay time prevents the circuit from the erroneous operation by AI and RST/TC input
bouncing.
t
62.5 msec : Alarm and reset input is ignored.
ON
62.5 ≤ t
t
ON
125 msec : Alarm and reset input is ignored or accepted.
ON
125 msec : Alarm and reset input is accepted.
tON
AI , RST/TC
(Active Low)
NIPPON PRECISION CIRCUITS—4
CF5741 series
Reset Function
RST/TC goes to active level when motor output can be stopped. Motor output(AO1,AO2) restart of another
stopped output after reset off.
RST/TC
(Active Low)
OUT1
(Active High)
OUT2
(Active High)
tPW
tCY tCY
tPW
tON
tCY
+0
−125msec
Alarm Output
Alarm input/output
AI
(Active Low)
AO1
(Active High)
*1
AO2/F
(Active High)
*2
AO2/F
(Active Low)
tON
fPW(Hz)fCY (Hz)
*1 : A O2 / F is the reverse phase of AO1, when output is active.
*2 : AO2 / F is complete reverse phase of AO1.
f
: Alarm fundamental frequency
PW
f
: Alarm modulation frequency
CY
NIPPON PRECISION CIRCUITS—5
CF5741 series
Test Function
Fundamental frequency alarm output function
AI goes to 1/2V
adjust frequency.
AI
(Active Low)
AO1
(Active High)
AO2/F
(Active High)
AO2/F
(Active Low)
when AO1 and AO2 output alarm fundamental frequency. This frequency can used to
DD
1/2VDD
fCY (Hz)
fPW(Hz)
*1
*2
*1 : A O2 / F is the reverse phase of AO1, when output is active.
*2 : AO2 / F is complete reverse phase of AO1.
: Alarm fundamental frequency
f
PW
fCY : Alarm modulation frequency
Gain fast function
RST/TC is active level more than 125 msec. And RST/TC input outside clock when motor output gain fast.
t
is more less than 0.9765625 msec.
CPW
tCPWtRES
RST/TC
(Active Low)
t
≥ 125msec
RES
t
≤ 0.9765625msec
CPW
NIPPON PRECISION CIRCUITS—6
APPLICATION CIRCUITS
Battery
1.5V
Reset
Switch
Alarm
Switch
M
Stepping
Motor
CF5741 series
VDD XT
RST/TC
XTN
CF5741AA
AI
CF5741AB
AO2/F
CF5741BA
CF5741BB
OUT1
OUT2
AO1
VSS
IN
C
X'tal
Speaker
Transistor
NIPPON PRECISION CIRCUITS INC. reserves the right to make changes to the products described in this data sheet in order to
improve the design or performance and to supply the best possible products. Nippon Precision Circuits Inc. assumes no responsibility for
the use of any circuits shown in this data sheet, conveys no license under any patent or other rights, and makes no claim that the circuits
are free from patent infringement. Applications for any devices shown in this data sheet are for illustration only and Nippon Precision
Circuits Inc. makes no claim or warr anty that such applications will be suitab le for the use specified without further testing or modification.
The products described in this data sheet are not intended to use for the apparatus which influence human lives due to the failure or
malfunction of the products. Customers are requested to comply with applicable laws and regulations in effect now and hereinafter,
including compliance with export controls on the distribution or dissemination of the products. Customers shall not expor t, directly or
indirectly, any products without first obtaining required licenses and approvals from appropriate government agencies.
NIPPON PRECISION CIRCUITS INC.
4-3, Fukuzumi 2-chome
Koto-ku, Tokyo 135-8430, Japan
NIPPON PRECISION CIRCUITS INC.
Telephone: 03-3642-6661
Facsimile: 03-3642-6698
NC9613DE 1998.08
NIPPON PRECISION CIRCUITS—7
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