NTE1537
Integrated Circuit
CMOS, Digital Frequency Indicator
w
/Clock LED Function
Applications:
D
Car Radio Applications:
FM/AM Receiving Frequency Display and Clock Display
D
Home Radio Applications:
FM/AM Receiving Frequency Display and Clock Display
D
Car Clock Applications:
HoursMinutes, MonthDate/Stopwatch Display
Functions:
D
FM Receiving Frequency Display (4 Digits)
D
AM Receiving Frequency Display (4 Digits)
D
MonthDate or Stopwatch Display (Either of these Selectable)
Features:
D
SingleChip CMOS LSI for Static Display System
D
Capable of Direct Driving Green LED (Drive Capacity 15mA)
D
Capable of Selecting Frequency Display/Time Display
D
Use FM/AM Local Oscillation Signal of Varactor Diode, Variable Capacitor, or
Tuning System
to Digitally Display FM/AM Receiving Frequency
D
Covers 4 AM Intermediate Frequencies: +262.5, +452.5, +455, +470kHz
D
Covers 2 FM Intermediate Frequencies: +10.7, 10.7MHz
D
Capable of FineAdjusting AM/FM Display Frequency Error Independently
A variable Resistor can be used to Correct AM IF Error within
2.8kHz
A variable Resistor can be used to Correct FM IF Error within
140kHz
D
Two Selections of Display System (12Hour System with PM Sign which is Displayed During
Setting Only, 24Hour System)
D
Programmed on Long Months (31 Days)/Short Months (30 Days). Date in February is Pro-
grammed to Count up to the 29
th
D
Easy to Set Time by th Time Signal
D
Stopwatch Capable of Counting/Displaying 1 Second to 12 Hours, 59 Minutes, 59 Seconds
D
Inhibit Pin for Inhibiting Time Setting with Display Unlighted
D
4MHz Crystal for Reference Frequency
Absolute Maximum Ratings: (T
A
= +25
C, V
SS
= 0V unless otherwise specified)
Maximum Supply Voltage, V
DD
max
0.3 to 11V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(Cumulative applied time: 30min or less)
0.3 to 14V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reference Voltage (V
ref
V
DD
), V
ref
0.3 to 10V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(Cumulative applied time: 30min or less)
0.3 to 13V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Voltage, V
I
0.3 to V
DD
+0.3V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Voltage (Output OFF), V
O
0.3 to V
DD
+0.3V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Allowable Power Dissipation (T
A
+75
C), P
D
max
800mW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Allowable Power Disipation of Segment Output, P
D
(seg)
Other than PM: I
OL
< 25mA
15mW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PM: I
OL
< 75mA
45mW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature Range, T
opr
30
to +75
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range, T
stg
40
to +125
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Allowable Operating Ranges: (T
A
= +25
C, V
DD
= 8 to 10.3V, V
SS
= 0V, V
ref
= 7.9 to 9V
V
DD
,
V
ref
= 0V if V
DD
< 8V unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Supply Voltage
V
DD1
All function operating mode
8.0
9.3
10.8
V
V
DD2
Only clock operating mode
4.3
5.0
8.0
V
Reference Voltage
V
ref
V
ref
V
DD
7.9
8.0
9.0
V
Input "H" Level Voltage
V
IH1
INHI, V
DD
= 4.3 to 10.3V
0.75V
DD
V
DD
V
Input "L" Level Voltage
V
IL1
V
SS
0.1V
DD
V
Input "H" Level Voltage
V
IH2
FM/AM, IFFM, IFAM
1
, IFAM
2
, 12H/24H
0.85V
DD
V
DD
V
Input "L" Level Voltage
V
IL2
V
SS
0.15V
DD
V
Input "H" Level Voltage
V
IH3
SET, DEMAND, CTR/CLK
0.88V
DD
V
DD
V
Input "L" Level Voltage
V
IL3
V
SS
0.12V
DD
V
Input "M" Level Voltage
V
IM
0.36V
DD
0.64V
DD
V
Input Frequency
f
IN1
FinFM, V
PP
= 0.7V, Duty 50%
0.6
2.0
MHz
f
IN2
FinAM, V
PP
= 0.7V, Duty 50%
0.4
2.5
MHz
Operating Frequency
f
opg
Crystal is externally connected across
OSCIN and OSCOUT
3.5
4.2
MHz
Input Amplitude
V
PP
FinFM, FinAM, Ceramic capacitor of
0.4
F is connected across V
DD
an V
SS
0.7
V
PP
Electrical Characteristics: (T
A
= +25
C, V
DD
= 8 to 10.3V, V
SS
= 0V, V
ref
= 7.9 to 9V,
V
ref
V
DD
unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Input Current
I
IN
FMFine, AMFine, V
IN
= 0V or V
ref
1
+1
A
Input "H" Level Current
I
IH1
IFFM, IFAM
1
, IFAM
2
, CTR/CLK,
12H/24H, V
IN
= 0.9V
DD
80
30
10
A
Input "L" Level Current
I
IL1
IFFM, IFAM
1
, IFAM
2
, CTR/CLK,
12H/24H, V
IN
= 0V
3
0
A
Input "H" Level Current
I
IH2
FM/AM, V
IN
= 0.9V
DD
40
15
5
A
Input "L" Level Current
I
IL2
FM/AM, V
IN
= 0V
3
0
A
Middle Point Setting Resistance
r
s
SET, DEMAND
40
70
100
k
Note 1. + sign: Flowing into LSI
sign: Flowing out of LSI
Electrical Characteristics (Cont'd): (T
A
= +25
C, V
DD
= 8 to 10.3V, V
SS
= 0V, V
ref
= 7.9 to 9V,
V
ref
V
DD
unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Input Floating Voltage
V
IF3
SET, DEMAND, input floating
0.45V
DD
0.55V
DD
V
Input "H" Level Current
I
IH4
INHI, V
DD
= 4.3 to 10.3V, V
IN
= V
DD
15
400
A
Input Floating Voltage
V
IF4
INHI, V
DD
= 4.3 to 10.3V, input floating
0
0.3
V
Feedback Resistance
Rf
1
Feedback resistance across OSCIN
and OSCOUT
3
M
Rf
2
Feedback resistance of FinFM
3
M
Rf
3
Feedback resistance of FinAM
3
M
Output "L" Level Voltage
V
OL1
PM, V
DD
= 8V, I
OL
= 45mA
0.7
V
V
OL2
Segment outputs other than PM
V
DD
= 8V, I
OL
= 15mA
0.7
V
Output Leakage Current
I
OFF
All segment outputs, V
DD
= 10.3V,
V
OH
= 10.3V
10
A
Current Dissipation
I
DD1
V
DD
= 10.3V, f
opg
= 4MHz (with crystal
mounted), f
IN2
= 2.5MHz (0.7V
PP
)
8
17
mA
I
DD2
V
DD
= 5.5V, f
opg
= 4MHz (with crystal
mounted), V
ref
= 0V, INHI = 0
1.0
2.5
mA
I
ref
V
DD
= 10.3V, V
ref
= 9V,
AMFine = FMFine = V
ref
0.5
1.5
mA
Note 1. + sign: Flowing into LSI
sign: Flowing out of LSI
Seg PM Digit 1
Seg c Digit 1
Seg b Digit 1
Seg a Digit 2
Seg f Digit 2
Seg e Digit 2
Seg d Digit 2
Seg c Digit 2
Seg g Digit 2
Seg b Digit 2
Seg a Digit 3
Seg f Digit 3
Seg e Digit 3
Seg d Digit 3
V
SS
Seg c Digit 3
Seg g Digit 3
Seg b Digit 3
Seg a Digit 4
Seg f Digit 4
Seg e Digit 4
INHI
Seg b Digit 4
Seg g Digit 4
Seg c Digit 4
Pin Connection Diagram
V
ref
V
DD
IF AM 2
FM Fine
FM/AM
1
2
3
4
5
FIN FM
6
FIN AM
7
IF FM
8
42
41
40
39
38
37
36
35
9
34
10
IF AM 1
11
33
32
12
31
13
AM Fine
30
14
CTL/CLD
29
12/24 H
15
SET
28
16
Demand
17
27
26
18
25
19
OSC Output
24
20
OSC Input
23
21
22
Seg d Digit 4
PDF 
ZIP