Micrel MIC1555YD5, MIC1555YM5, MIC1555YMU, MIC1557YD5, MIC1557YM5 Schematic [ru]
IttyBitty is a registered trademark of Micrel, Inc.
August 12
General Description
The MIC1555 IttyBitty® CMOS RC timer/oscillator and
MIC1557 IttyBitty
provide rail-to-rail pulses for precise time delay or
frequency generation.
The devices are similar in func tion to the industr y standard
“555”, without a frequency control (FC) pin or an opencollector discharge (D) pin. The threshold pin (THR) has
precedence over the trigg er (TRG) input, ensuring that the
BiCMOS output is off when TRG is high.
The MIC1555 can be used as an astable (oscillator) or
monostable (one-shot) with separate thresho ld and trigger
inputs. In the one-shot mode, the output pulse width is
precisely controlled by an external resistor and a capacitor.
Time delays may be accurately controlled from microseconds to hours. In the oscillator mode, the output is
used to provi de precise feedback, with a m inimum of one
resistor and one capacitor producing a 50% duty cycle
square wave.
The MIC1557 is designe d for astable (osc illator) operatio n
only, with a chip select/r eset (CS) input for low po wer shutdown. One resistor and one capacitor provide a 50% duty
cycle square wave. Other duty-cycle ratios may be
produced using two diodes and two resistors.
The MIC1555/7 is powere d from a +2.7V to +18V supply
voltage and is rated for –40°C to +85°C ambient
temperature range. T he MIC 155 5/7 is available in SOT-235, and thin SOT23-5 5-pin packages. A low profil e, ultrathin, (UTDFN), version of the MIC1555 (with c hip selec t) is
also available.
Datasheets and support documentation are available on
Micrel’s website at: www.micrel.com
®
CMOS RC oscillator are designed to
.
MIC1555/1557
IttyBitty® RC Timer/Oscillator
Features
• +2.7V to +18V operation
• Low current
− <1µA typical shutdown mode (MIC1557)
− 200µA typical (TRG and THR low) at 3V supply
• Timing from microseconds to hours
• “Zero” leakage trigger and threshold inputs
• 50% square wave with one resistor, one capacitor
• Threshold input precedence over trigger input
• <15Ω output on resistance
• No output cross-conduction current spikes
• <0.005%/°C temperature stability
• <0.055%/V supply stability
• 10-pin ultra-thin DFN package (2mm × 2mm × 0.4mm)
• Small SOT-23-5 surface mount package
Applications
• Precision timer
• Pulse generation
• Sequential timing
• Time-delay generation
• Missing pulse detector
• Micropower oscillator to 5MHz
• Charge-pump driver
• LED blinker
• Voltage converter
• Linear sweep generator
• Variable frequency and duty cycle oscillator
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
, 2015
Revision 6.1
Micrel, Inc.
MIC1555/1557
August 12
Typical Applications
Monostable (One-Shot)
Monostable (with Enable)
Astable (Oscillator)
, 2015 2
Revision 6.1
Micrel, Inc.
MIC1555/1557
August 12
(1, 2)
(Top View)
(Top View)
Ordering Information
Part Number Top Marking
MIC1555YD5 T12
MIC1555YMU T14
MIC1555YM5 T10
MIC1557YD5 T13
MIC1557YM5 T11
Note:
1. Underbars ( ) shown for the top marking may not be to scale.
2. The top marking in the YMU package does not have an underbar.
Temperature Range Package Package Height (mm)
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
10-Pin 2mm × 2mm UTDFN 0.4 (maximum)
Pin Configuration (MIC1555 SOT-23 and TSOT-23)
5-Pin SOT-23 (M5)
5-Pin Thin SOT-23 1.0 (maximum)
5-Pin SOT-23 0.9 – 1.45
5-Pin Thin SOT-23 1.0 (maximum)
5-Pin SOT-23 0.9 – 1.45
5-Pin TSOT-23 (D5)
Pin Description (MIC1555 SOT-23 and TSOT-23)
Pin Number Pin Name Pin Function
1 VS Supply (Input): +2.7V to +18V supply.
2 GND Ground: Supply return.
3 OUT Output: CMOS totem-pole output.
4 TRG Trigger (Input): Sets output high. Active low (at ≤2/3VS nominal).
5 THR Threshold (Dominant Input): Sets output low. Active high (at ≥2/3VS nominal).
, 2015 3
Revision 6.1
Micrel, Inc.
MIC1555/1557
August 12
(Top View)
(Top View)
(Top View)
Pin Configuration (MIC1555 UTDFN)
10-Pin UTDFN (MU)
Pin Description (MIC1555 UTDFN)
Pin Number Pin Name Pin Function
1 VS Supply (Input): +2.7 to +18V supply.
2 CS
3, 4, 7, 9 NC No Connect. This pin is not internally connected.
5 THR Threshold (Dominant Input): Sets output low. Active high (at ≥ 2/3VS nominal).
6 TRG Trigger (Input): Sets output high. Active low (at ≤2/3VS nominal).
8 GND Ground: Supply return.
10 OUT Output: CMOS totem-pole output.
Chip Select/Reset (Input): Active high at >2/3V
functionality is not desired, CS may be connected directly to VS.
Pin Configuration (MIC1557 SOT-23 and TSOT-23)
. Output off when low at <1/3VS. If chip select
S
Pin Description (MIC1557 SOT-23 and TSOT-23)
5-Pin SOT-23 (M5)
Pin Number Pin Name Pin Function
Trigger/Threshold (Input): Internally connected to both threshold and trigger functions. When the
1 T/T
2 GND Ground: Supply return.
3
4 VS Supply (Input): +2.7 to +18V supply.
5 OUT Output: CMOS totem-pole output.
CS
voltage at this pin is ≤2/3VS it will set the output high. When the voltage at this pin is ≥2/3VS it will set
the output low.
Chip Select/Reset (Input): Active high at >2/3V
functionality is not desired, CS may be connected directly to VS.
, 2015 4
5-Pin TSOT-23 (D5)
. Output off when low at <1/3VS. If chip select
S
Revision 6.1
Micrel, Inc.
MIC1555/1557
August 12
Parameter
Condition
Min.
Typ.
Max.
Units
(6)
(6)
(6)
Absolute Maximum Ratings
(3)
Supply Voltage (VS) ...................................................... +22V
Threshold Voltage (V
Trigger Voltage (V
TGR
, V
THR
, V
). .................................... +22V
T/T
) .......................................... +22V
T/T
Lead Temperature (soldering, 10s) ............................ 300°C
Ambient Storage Temperature .................. –65°C to +150°C
ESD HBM Rating
(5)
......................................................... 2kV
ESD MM Rating............................................................ 200V
Electrical Characteristics
TA = 25°C, bold values indicate –40°C ≤ TA ≤ +85°C, unless noted.
Operating Ratings
(4)
Supply voltage (VS) ....................................... +2.7V to +18V
Ambient Temperature (T
) .......................... –40°C to +85°C
A
Package Thermal Resistance
SOT23-5 and Thin SOT23-5 (θ
2mm × 2mm UTDFN (θ
) ................................. 90°C/W
JA
) ................... 250°C/W
JA
Supply Current
Monostable Timing Accuracy
Monostable Drift
Overtemperature
Monostable Drift over Supply VS = 5V to 15V
Astable Timing Accuracy
Maximum Astable
Frequency
Astable Drift
Overtemperature
Astable Drift over Supply VS = 5V to 15V
VS = 5V
VS = 15V
RA = 10kΩ, C =0.1µF, VS = 5V
RA = 10kΩ, C =0.1µF, VS = 5V
V
= 5V, –55°C ≤ TA ≤ +125°C
S
VS = 10V, –55°C ≤ TA ≤ +125°C
VS = 15V, –55°C ≤ TA ≤ +125°C
(6)
= RB = 10kΩ, C = 0.1µF, VS = 5V
R
A
(6)
RA = RB = 10kΩ, C = 0.1µF, VS = 5V
RT = 1kΩ, CT = 47pF, VS = 8V
VS = 5V, –55°C ≤ TA ≤ +125°C
VS = 10V, –55°C ≤ TA ≤ +125°C
VS = 15V, –55°C ≤ TA ≤ +125°C
(6)
(6)
(6)
Threshold Voltage VS = 15V
Trigger Voltage VS = 15V
Trigger Current VS = 15V
Threshold Current VS = 15V
Chip Select
Notes:
3. Ex ceeding the absolute maximum ratings may damage the device
4. The device is not guaranteed to function outside its operating ratings.
5. D evices are ESD protected, however handling precautions recommended.
6. Not tested.
on > 2/3 VS
off < 1/3 VS
858
1717
61
27
50
28
240
350
2
100
150
200
0.5
2
5
100
150
200
0.5
67
32
67
33
300
400
1161
2323
72
37
50
50
72
50
µA
%
µs
ppm/°C
%/V
%
µs
MHz
ppm/°C
%/V
%/V
S
%/V
S
nA
nA
%/VS
, 2015 5
Revision 6.1
Micrel, Inc.
MIC1555/1557
August 12
(6)
Electrical Characteristics (Continued)
TA = 25°C, bold values indicate –40°C ≤ TA ≤ +85°C, unless noted.
Parameter Condition Min. Typ. Max. Units
VS = 15V, I
Output Voltage Drop
VS = 5V, I
VS = 15V, I
VS = 5V, I
Supply Voltage Functional Operation
SINK
= 3.2mA
SINK
SOURCE
SOURCE
= 20mA
= 20mA
= 3.2mA
Output Rise Time RL = 10MΩ, CL = 10pF, VS = 5V
Output Fall Time RL = 10MΩ, CL = 10pF, VS = 5V
0.3
0.08
14.1
3.8
14.7
4.7
2.7
(6)
(6)
15
15
1.25
0.5
18
V
V
ns
ns
, 2015 6
Revision 6.1
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