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Part Number NTE1254

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NTE1254
Integrated Circuit
Phase­Lock Loop (PLL) Frequency
Synthesizer for CB
Features:
D
Programmable Divider ­ Divided by 3 to 255
D
10­Bit Divider
D
Phase Detector
D
Reference Oscillation Circuit
D
On­Chip Filter Amplifier
D
Code Converter
D
Only two or three crystals required for CB radio AM frequency selection
D
Unlocked signals are detected at instant stop "IS" terminal
D
Two type program mode can be selected to change input mode level
M: Low level
Binary code input enables, divided by 3 to 255
.
M: High level
BCD code enables that the data at P
1
to P
6
port is offset 90 by code converter
.
D
Internal active filter amplifier has a long holding time due to very high input impedance charac-
teristics of the CMOS­this is to obtain very good spurious response.
D
Output signal of the "I" can be used to stop the spurious radiation when the channel selector
makes misprogramming such as rotary switch's lose contact.
D
High speed and low power consumption due to CMOS
D
Single power supply and fully TTL compatible: V
DD
= 5
±
0.5 Volts
D
Operating Temperature: T
A
= ­30
°
to 65
°
C
D
Pull down resistors installed in program and mode switch inputs
Absolute Maximum Ratings:
Supply Voltage
­0.3 to +6.0V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Voltage
­0.3 to +6.0V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature Range, T
opr
­35
°
to +75
°
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range, T
stg
­55
°
to +125
°
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics: (T
A
= ­ 35
°
to +75
°
C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Power Supply
V
DD
4.5
5.0
5.5
V
Total Current
I
DD
f = 0
­
­
10
mA
High Level Input Voltage
V
IH
All Inputs
0.8V
DD
­
V
DD
V
Low Level Input Voltage
V
IL
All Inputs
­0.3
­
0.2V
DD
V
High Level Output Voltage
V
OH
All Outputs Except D
2
, I
O
= ­0.3mA,
V
DD
= 4.5V
0.85V
DD
­
V
DD
V
I
O
= ­0.15mA, V
DD
= 4.5V
0.85V
DD
­
V
DD
V
Low Level Output Voltage
V
OL
All Inputs, I
O
= 0.5mA, V
DD
= 4.5V
­0.3
­
0.15V
DD
V
Leakage Current
I
L
EO (Floating), Al T
A
= +25
°
C
­
1.0
­
nA
Input Capacitance
C
i
PI, FD, FP, X
1
, V
i
= 0
­
­
10
pF
Maximum Frequency
f
d
max
X
1
­ X
2
, Divider
11
­
­
MHz
Response
f
p
max
Programmable Divider
­
2
­
MHz
V
SS
Divider Input
Input Mode Switch
Divider Output
Detector Input
Divider Output
Detector Input
Filter Amp Output
Filter Amp Input
Phase Error Output
Instant Stop
V
DD
Program Input P6
Inhibit Output
X'tal Input
1
2
3
4
Program Input P1
Program Input P2
Program Input P3
Program Input P4
5
Program Input P5
6
7
Program Input P7
24
23
22
21
20
19
18
8
Program Input P8
9
1/2 Output Reference
17
16
10
X'tal Input
11
12
15
14
13
Pin Connection Diagram
1
12
24
13
1.300 (33.02)
Max
.520
(13.2)
.600
(15.24)
1.100 (27.94)
.100 (2.54)
.225
(5.73)
Max
.126
(3.22)
Min