32.768 KHz CLOCK OSCILLATORS “LPO57 Series” Logic

32.768 KHz CLOCK OSCILLATORS
“LPO57 Series”
Logic: CMOS 5x7 mm
Wave Form: Square wave
MERCURY
Since 1973
LPO57 (5x7x1.4 mm) is a 32.768 KHz clock oscillator designed
specifically for battery operated portable or hand-held consumer
electronic devices where real time clock timing is required and
board space is at a premium. Low current consumption (6 uA at
3.3 V), wide operating voltage (from 1.5 V to 6 V), space saving
and cost-effective make LPO57 an ideal choice of precise timing.
General Specifications
TA=+25°C, VDD at specified voltage, CL=15 pF
Product Series
Frequency
Input Voltage (VDD)
Output Logic
Frequency Calibration Tolerance
Frequency Stability
LPO57
32.768 KHz
+1.5 V D.C. to +6.0 V D.C.
Voltage code “15”: VDD = +1.5 V D.C. ±10 %
Voltage code “18”: VDD = +1.8 V D.C. ±10 %
Voltage code “2”: VDD = +2.0 V D.C. ±10 %
Voltage code “27”: VDD = +2.7 V D.C. ±10 %
Voltage code “3” VDD = +3.3 V D.C. ±10 %
Voltage code “5”: VDD =+5 V D.C.±10 %
CMOS
Tolerance code “P”: ±10 ppm at +25°C
Tolerance code “A”: ±25 ppm at +25°C (standard)
Tolerance code “B”: ±50 ppm at +25°C
Tolerance code “C”: ±100 ppm at +25°C
Please refer to the parabolic curve shown below
-60 ppm max. when operating at 0°C to +70°C
-200 ppm max. when operating at -40°C to +85°C.
For higher stability requirement, please see note below.
Output Voltage HIGH “1”; VOH
Output Voltage LOW “0”; VOL
Rise Time / Fall Time
Duty Cycle (Symmetry)
Start-up Time (Ts)
Load
Current Consumption
Pad 1 Options
Aging
Packaging
PRELIMINARY
(1)
+0.9*VDD min.
+0.1*VDD max.
200 n sec. max. when measured from (10% VDD ↔ 90% VDD)
45% min; 55% max. measured at 50% VDD
500 m sec. typical at +3.3 V
15 pF
See current consumption vs VDD chart below
Output is high impedance if pad 1 is connected to ground.
32.768 KHz output if pad is connected to VDD or not
connected.
±5 ppm per year max.
16 mm tape; 8 mm pitch; 1000 pcs per reel.
(1)
Negative frequency drifting is due to the X-cut tuning fork crystal 32.768 KHz. If tighter frequency stability
(±10 ppm or ±25 ppm over 0°C to +70°C or wider) is required please consider using H57-32.768K series,
where AT-cut crystal is used and the current consumption is in the mA range. For ±1 ppm to ±5 ppm
frequency stability please consider using VM57T-32.768K (VCTCXO) or M57T-32.768K (TCXO) series
products.
MERCURY
www.mercury-crystal.com
Taiwan: TEL (886)-2-2406-2779, FAX (886)-2-2496-0769, e-mail: sales-tw@mercury-crystal.com
U.S.A.: TEL (1)-909-466-0427, FAX (1)-909-466-0762, e-mail: sales-us@mercury-crystal.com
MERCURY
Page 1 of 3
Date: Jan. 23, 2005
Rev. 0
32.768 KHz CLOCK OSCILLATORS
“LPO57 Series”
Logic: CMOS 5x7 mm
Wave Form: Square wave
FREQUENCY TEMPERATURE CHARACTERISTIC
CURVE (Parabolic Curve)
MERCURY
Since 1973
CURRENT CONSUMPTION vs VDD CHART
Typical
Max.
LPO57 Current Consumption
Current (uA)
20
15
10
5
0
1.5
Environmental Performance Specifications
RoHS Compliance
Storage temp. range
Humidity
Hermetic seal
Solderability
Reflow
Vibration
Shock
2
2.5
3
3.5
4
4.5
Supply Voltage VDD
Pb (lead) free
-55 to +125°C
85% RH, 85°C, 48 hours
Leak rate 2x10-8 ATM-cm3/sec max.
MIL-STD-202F method 208E
260°C for 10 sec.
MIL-STD-202F method 204, 35G, 50 to 2000 Hz
MIL-STD-202F method 213B, test condi. E, 1000GG ½ sine wave
Part Number Format and Example:
Example: 18LPO57-AT-32.768K
Explanation: LPO57 clock oscillator, +1.8 V supply voltage, ±25 ppm frequency tolerance (at+25°C), Tri-state option on
pad 1, 32.768 KHz.
"
18
LPO57
—
"
"
A
T
—
32.768K
n o
p q
r
n: Voltage codes: “18” for +1.8 V; “2” for +2.0 V; “3” for +3.3 V. See more voltage codes above.
o: Product series p: Frequency Calibration Tolerance code: “P”,“A”,”B” or “C”. See tolerance codes
above. q: “T”: Tri-state option on pad 1 (Tri-state is standard if not specified), leave blank if tri-state is not
required. r 32.768 KHz.
MERCURY
Page 2 of 3
Date: Jan. 23, 2005
Rev. 0
5
32.768 KHz CLOCK OSCILLATORS
“LPO57 Series”
Logic: CMOS 5x7 mm
Wave Form: Square wave
LPO57 OUTPUT WAVEFORM:
MERCURY
Since 1973
LPO57 Test Circuit:
Tf
Tr
VOH
90% Vcc
i
VOL
10% Vcc max.
TH
T
Duty Cycle = (TH / T)x100%
LPO57 Package Dimensions and Recommended Pad Layout:
[0.024]
0.6
3
Pad 2
Pad 3
Pad 4
Tri-State or
No Connection
Ground
Output
Supply voltage
3
2
R0
.7
4
1
5.08 [0.200]
typical
bottom view
2.2[0.086]
1.8[0.071]
0.55 [0.022]
Pad 1
[0.004]
0.1
2
1.8±0.2
[0.071±0.008]
1
[0.049]
1.25
_ LPO57_
32.768 KHz
MEC
[0.055]
1.4
2.0[0.079]
[0.197±0.006]
5.00±0.15
4
[0.275±0.006]
7.00±0.15
unit mm[inches]
5.08 [0.200]
Chamfered pad is pad No. 1. Count counter-clockwise when looking at top view.
Count clockwise when looking at bottom view.
MERCURY
Page 3 of 3
Date: Jan. 23, 2005
Rev. 0