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MT9043AN1

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30
MT9043 Data Sheet
16
Zarlink Semiconductor Inc.
Figure 10 - Power-Up Reset Circuit
Lock Indicator
The LOCK pin toggles at a random rate when the PLL is frequency locked to the input reference. In Figure 11 the
RC-time-constant circuit can be used to hold the high state of the LOCK pin.
Once the PLL is frequency locked to the input reference, the minimum duration of LOCK pin’s high state would be
32ms and the maximum duration of LOCK pin’s low state would not exceed 1 second. The following equations can
be used to calculate the charge and discharge times of the capacitor.
t
C
= - R
D
C ln(1 – V
T+
/V
DD
) = 240 μs
t
C
= Capacitor’s charge time
R
D
= Dynamic resistance of the diode (100 Ω)
C = Capacitor value (1 μF)
V
T+
= Positive going threshold voltage of the
Schmitt Trigger (3.0 V)
V
DD
= 3.3 V
t
D
= - R C ln(V
T-
/V
DD
) = 1.65 seconds
t
D
= Capacitor’s discharge time
R = Resistor value (3.3 MΩ)
C = Capacitor value (1 μF)
V
T-
= Negative going threshold voltage of the
Schmitt Trigger (2.0 V)
V
DD
= 3.3 V
+3.3 V
RST
R
P
1kΩ
C
10 nF
R
10 kΩ
MT9043
MT9043 Data Sheet
17
Zarlink Semiconductor Inc.
Figure 11 - Time-constant Circuit
A digital alternative to the RC-time-constant circuit is presented in Figure 12. The circuit in Figure 12 can be used to
generate a steady lock signal. The circuit monitors the MT9043’s LOCK pin, as long as it detects a positive pulse
every 1.024 seconds or less, the Advanced Lock output will remain high. If no positive pulse is detected on the
LOCK output within 1.024 seconds, the Advanced LOCK output will go low.
Figure 12 - Digital Lock Pin Circuit
Lock
R=3.3M
MT9043
IN4148
LOCK
74HC14 74HC14
C=1 μf
+
MT9043
MT9043 Data Sheet
18
Zarlink Semiconductor Inc.
* Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied.
* Supply voltage and operating temperature are as per Recommended Operating Conditions.
Absolute Maximum Ratings* - Voltages are with respect to ground (V
SS
) unless otherwise stated.
Parameter Symbol Min. Max. Units
1 Supply voltage V
DD
-0.3 7.0 V
2 Voltage on any pin V
PIN
-0.3 V
DD
+ 0.3 V
3 Current on any pin I
PIN
30 mA
4 Storage temperature T
ST
-55 125 °C
5 48 SSOP package power dissipation P
PD
200 mW
Recommended Operating Conditions - Voltages are with respect to ground (V
SS
) unless otherwise stated.
Characteristics Sym. Min. Max. Units
1 Supply voltage V
DD
3.0 3.6 V
2 Operating temperature T
A
-40 85 °C
DC Electrical Characteristics* - Voltages are with respect to ground (V
SS
) unless otherwise stated.
Characteristics Sym. Min. Max. Units Conditions/Notes
1 Supply current with: OSCi = 0 V I
DDS
1.8 mA Outputs unloaded
2OSCi = ClockI
DD
50 mA Outputs unloaded
3 CMOS high-level input voltage V
CIH
0.7V
DD
V
4 CMOS low-level input voltage V
CIL
0.3V
DD
V
5 Input leakage current I
IL
15 μAV
I
=V
DD
or 0 V
6 High-level output voltage V
OH
2.4 V I
OH
= 10 mA
7 Low-level output voltage V
OL
0.4 V I
OL
= 10 mA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30

MT9043AN1

Mfr. #:
Buy MT9043AN1
Manufacturer:
Microchip / Microsemi
Description:
Telecom Interface ICs Pb Free T1/E1 SYSTEM SYNCHRONIZER
Lifecycle:
New from this manufacturer.
Delivery:
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