BETASelected C-grade supply2–15 V recommended
Low-power CMOS timer
TLC555 Specifications
Review TLC555 electrical specifications, operating conditions and package details.
Package view
Key specifications
The familiar eight-pin timer, with a low-current CMOS core.
Supply current180 µA typical · 5 V, 25°C
Selected ambient range0–70 °C
Package contacts8 PDIP / SOIC
Package details
TLC555CP · PDIP-8
| Property | Details |
|---|---|
| Manufacturer | Texas Instruments |
| Part number | TLC555CP |
| Package | PDIP-8 |
| Connections | 8 pins |
| Mounting | Through-hole |
| Lead pitch | 2.54 mm |
| Package code | PDIP-8 |
| Thermal reference | See operating and package limits |
Recommended operation
TLC555CP / TLC555CDR
Manufacturer specifications 5 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Supply | 2–15 V | C grade; example uses 5 V |
| Ambient | 0 to +70°C | C grade in either selected package |
| Industrial grade comparison | 3–15 V; −40 to +85°C | TLC555I, not the selected parts |
| Nominal timing window | 1/3 to 2/3 VDD | CONT unmodulated |
| Typical output capabilities | 100 mA sink; 10 mA source | Feature values, not guaranteed rail-level drive |
No specifications match. Try a parameter name or a unit.
Observe the electrical test conditions and thermal limits; output capability is asymmetric.
Five-volt electrical limits
25°C unless stated
Manufacturer specifications 8 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Supply current | 180 µA typical; 350 µA max | 5 V; expected timing configurations |
| Supply current over C-grade temperature | 500 µA max | 5 V; 0–70°C |
| Trigger threshold | 1.36–1.96 V; 1.66 V typical | 5 V, 25°C |
| Upper threshold | 2.8–3.8 V; 3.3 V typical | 5 V, 25°C |
| HIGH output | 4.8 V typical; 4.1 V minimum | Sourcing 1 mA |
| LOW output | 0.21 V typical; 0.4 V maximum | Sinking 8 mA |
| Timing-input current | 10 pA typical | 25°C; TRIG and THRES |
| Timing-input capacitance | 2.1 pF typical | Each timing input |
No specifications match. Try a parameter name or a unit.
Typical values describe characterization, not guaranteed performance for every device.
Nominal timing equations
Standard two-resistor astable
Manufacturer specifications 5 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| HIGH time | ln(2) × (RA + RB) × C | Charging interval |
| LOW time | ln(2) × RB × C | Discharge interval |
| Frequency | 1 / [ln(2) × (RA + 2RB) × C] | Ω, F, seconds |
| HIGH duty cycle | (RA + RB) / (RA + 2RB) | Ordinary astable duty exceeds 50% |
| Monostable duration | Approximately 1.1 × R × C | Clean trigger must release before the interval finishes |
No specifications match. Try a parameter name or a unit.
Initial power-up timing differs from subsequent cycles. Comparator limits, leakage and component tolerance change real timing.
Low-current LED flasher
5 V · nominal 0.988 Hz
Manufacturer specifications 7 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| RA / RB | 10 kΩ / 68 kΩ | RA from VDD8 to DISCH7; RB from DISCH7 to TRIG2/THRES6 |
| Timing capacitor | 10 µF | Positive at timing node, negative at ground |
| HIGH / LOW interval | 0.541 / 0.471 s | Ideal steady-state values |
| HIGH duty | 53.42% | LED anode driven through 4.7 kΩ from OUT3 |
| LED current estimate | Approximately 0.64 mA | (5−2)/4700; actual output and LED drops vary |
| RESET / CONT | 4 to VDD; 5 through 10 nF to GND | No floating controls |
| Local bypass | 100 nF | VDD8 directly to GND1 |
No specifications match. Try a parameter name or a unit.
All ground symbols are the same return. Use a driver for larger loads.
Input priority
RESET first, then trigger
Manufacturer specifications 4 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| RESET LOW | OUT LOW; DISCH ON | Overrides the timing inputs |
| TRIG below lower threshold | OUT HIGH; DISCH OFF | RESET inactive |
| THRES above upper threshold | OUT LOW; DISCH ON | TRIG above lower threshold |
| Both between thresholds | Latch retains state | No new threshold crossing |
No specifications match. Try a parameter name or a unit.
The ordinary timing equations assume CONT is bypassed and RESET is HIGH.
Package and absolute limits
TLC555CP · PDIP-8
Manufacturer specifications 7 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Pitch | 2.54 mm | Through-hole |
| Absolute supply | −0.3 to +18 V | Stress rating, not the 15 V operating limit |
| Absolute input | −0.3 V to VDD | Any input |
| Absolute output/discharge sink | 150 mA | Stress limit, not recommended continuous loading |
| Absolute output source | 15 mA | Stress limit |
| Storage | −65 to +150°C | Unpowered |
| Junction-to-ambient reference | 93.1°C/W PDIP; 138.9°C/W SOIC | TI thermal test conditions; board-dependent |
No specifications match. Try a parameter name or a unit.
Do not design continuous operation at an absolute maximum.
Connections by function
Select a pin for its function, connection guidance and electrical notes.