BA225 - CR timer

Rohm 2009/03/23 09:35
Description
The BA225, BA225F, BA235, BA226, BA226F, and BA236 are monolithic ICs having independent monostable multivibrator circuits which consume very low current (0.75mA typ.). Using external resistors and capacitors, the timing control time can be set within a range from 0.01ms to 100ms.
As the BA225, BA225F, and BA235 are triggered at the rising edge of the signal, they have no trigger input differentiating circuit and can be used in measuring instruments, control devices, digital data systems and other equipment as sub-compact attachments. The BA226, BA226F, and BA236 are available as falling edge trigger types.

Features
*As these are edge trigger types (BA225 / BA235: rising edge trigger types, BA226 / BA236: falling edge trigger types), there is no need for an input differentiating circuit.
*The dual type design enables delay timer configuration.
*Fewer attachments are required.
*Current dissipation is as low as 0.75mA for each circuit.
*Uniformity in the supply current between high and low output states simplifies the design of the power supply section.
*Wide operating power supply voltage range of 4.0V to 16V.
*The BA235 and BA236 pin assignments are symmetrical, allowing reverse insertion.
*Hysteresis in the input results in a high level of noise withstand resistance.

Applications
*Delay timers
*Monostable multivibrator (ideal for VCR system controllers)
*Pulse generators

BA225F, BA235, BA226, BA226F, BA236
TAG CR, Timer

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DESCRIPTION
 The CAT1232LP and CAT1832 microprocessor supervisors can halt and restart a “hung-up” or “stalled” microprocessor, restart a microprocessor after a power failure, and debounce a manual/push-button microprocessor reset switch.
The devices are drop in replacements for the Maxim/Dallas Semiconductor DS1232LP and DS1832 supervisors Precision reference and comparator circuits monitor the 5V or 3.3V system power supply voltage, VCC.
During power-up or when the power supply falls outside selectable tolerance limits, both the RESET and RESET¯¯¯¯¯¯ become active.
After the power supply voltage rises above the RESET threshold voltage, the reset signals remain active for a minimum of 250ms, allowing the power supply and system processor to stabilize.
The trip-point tolerance input, TOL, selects the trip level tolerance to be either 5% or 10% for the CAT1232LP 5V supply and 10% or 20% for the CAT1832 3.3V supply.
Each device has a push-pull, active HIGH reset output.
The CAT1232LP also has an open drain, active LOW reset output while the CAT1832 also has a push-pull, active LOW reset output.
A debounced manual reset input activates the reset outputs and holds them active for a minimum period of 250ms after being released.
Also included is a watchdog timer to reset a microprocessor that has stopped due to a software or hardware failure.
Three watchdog time-out periods are selectable: 150ms, 600ms and 1.2s. If the ST¯¯ input is not strobed low before the watchdog time out period expires, the reset signals become active for a minimum of 250ms.

FEATURES
* Selectable reset voltage tolerance
- CAT1232LP for 5V supply
- CAT1832 for 3.3V supply
* Selectable watchdog period: 150ms, 600ms or 1.2s
* Two reset outputs
- Active high, push-pull reset output
- Active low, open-drain reset output (CAT1232LP)
- Active low, push-pull reset output (CAT1832)
* Debounced manual push-button reset
* Compact SOIC and MSOP packages

APPLICATIONS
* Microprocessor Systems
* Portable Equipment
* Controllers
* Single Board Computers
* Instrumentations
* Telecommunications

CAT1232LPL-G
CAT1232LPV-GT3
CAT1232LPZ-GT3
CAT1232LPW-T2

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General Description
 The CD4541BC Programmable Timer is designed with a 16-stage binary counter, an integrated oscillator for use with an external capacitor and two resistors, output control logic, and a special power-on reset circuit. The special features of the power-on reset circuit are first, no additional static power consumption and second, the part functions across the full voltage range (3V–15V) whether power-on reset is enabled or disabled.

 Timing and the counter are initialized by turning on power, if the power-on reset is enabled. When the power is already on, an external reset pulse will also initialize the timing and counter. After either reset is accomplished, the oscillator frequency is determined by the external RC network. The 16-stage counter divides the oscillator frequency by any of 4 digitally controlled division ratios.

Features
* Available division ratios 28, 210, 213, or 216
* Increments on positive edge clock transitions
* Built-in low power RC oscillator (±2% accuracy over temperature range and ±10% supply and ±3% over processing @ < 10 kHz)
* Oscillator frequency range ≈ DC to 100 kHz
* Oscillator may be bypassed if external clock is available (apply external clock to pin 3)
* Automatic reset initializes all counters when power turns on
* External master reset totally independent of automatic reset operation
* Operates at 2n frequency divider or single transition timer
* Q/Q select provides output logic level flexibility
* Reset (auto or master) disables oscillator during resetting to provide no active power dissipation
* Clock conditioning circuit permits operation with very slow clock rise and fall times
* Wide supply voltage range—3.0V to 15V
* High noise immunity—0.45 VDD (typ.)
* 5V–10V–15V parameter ratings
* Symmetrical output characteristics
* Maximum input leakage 1 µA at 15V over full temperature range
* High output drive (pin 8) min. one TTL load

CD4541BCM CD4541BCN
TAG Timer

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Description
HA17555 Series are ICs designed for accurate time delays or oscillations. It provides both of trigger terminal and reset terminal in order to enable a wide scope of application including Mono Multi Vibrator and Astable Multi Vibrator, and the number of external components is fewer. Further, it’s compatible with NE555 of singnetics.

Features
·  Mono multi vibrator can be constructed with one resistor and one capacitor.
·  Astable multi vibrator can be constructed with two resistors and one capacitor.
·  Delay time can be established widely from several μ seconds to several hours.
·  Pulse Duty can be controlled.
·  The maximum value of both sink current and source current is 200mA.
·  Direct connection of output to TTL is possible.
·  Temperature/delay time ratio is 50 ppm/°C (typ).
·  Output is normally in the on and off states.

HA17555PS HA17555FP HA17555 HA17555F
TAG Timer

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DEVICE DESCRIPTION
These devices are precision timing circuits for generation of accurate time delays or
oscillation. Advanced circuit design means that these devices can operate from a single battery
cell with the minimum of quiescent current. In monostable mode time delays are controlled by a single resistor and capacitor network. In astable mode the frequency and duty cycle can be accurately and independently controlled with two external resistors and one capacitor.
The threshold and trigger levels are normally set as a proportion of VCC by internal resistors.
These levels can be programmed by the use of the control input pin. When the trigger input reduces to a value below the trigger level, the flip-flop is set and the output goes high. With the trigger input above the trigger level and the threshold input above the threshold level, the flip-flop is reset and the output goes low. The reset pin has priority over all the other inputs and is used to start new timing cycles. A low on the reset input causes the flip-flop to reset forcing the
output low. Whenever the output is forced low then the internal discharge transistor is turned on.

FEATURES
· 0.9V supply operating voltage guaranteed
· Pin connections comparable with 555 series timers
· Very low quiescent current 74 mA
· SO8 and DIL8 packages
· Operating temperature range compatible with battery technologies

ZSCT1555D8 ZSCT1555N8
TAG Timer

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NE555V - Timer

Philips 2006/08/17 09:18
DESCRIPTION
The 555 monolithic timing circuit is a highly stable controller capable of producing accurate time delays, or oscillation. In the time delay mode of operation, the time is precisely controlled by one external resistor and capacitor. For a stable operation as an oscillator, the free running frequency and the duty cycle are both accurately controlled with two external resistors and one capacitor. The circuit may be triggered and reset on falling waveforms, and the output
structure can source or sink up to 200mA.

FEATURES
• Turn-off time less than 2ms
• Max. operating frequency greater than 500kHz
• Timing from microseconds to hours
• Operates in both astable and monostable modes
• High output current
• Adjustable duty cycle
• TTL compatible
• Temperature stability of 0.005% per °C

APPLICATIONS
• Precision timing
• Pulse generation
• Sequential timing
• Time delay generation
• Pulse width modulation
TAG Timer

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NE555 - Single Timer

Fairchild 2006/05/10 10:39
Features
• High Current Drive Capability (200mA)
• Adjustable Duty Cycle
• Temperature Stability of 0.005%/°C
• Timing From µSec to Hours
• Turn off Time Less Than 2µSec

Applications
• Precision Timing
• Pulse Generation
• Time Delay Generation
• Sequential Timing

Description
The LM555/NE555/SA555 is a highly stable controller
capable of producing accurate timing pulses. With a
monostable operation, the time delay is controlled by one
external resistor and one capacitor. With an astable
operation, the frequency and duty cycle are accurately
controlled by two external resistors and one capacitor.

8-DIP
8-SOP

LM555/NE555/SA555
Single Timer
TAG Timer

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